SI4710-B31-GMR

AN332 Si47 XX P ROGRAMMING G U I D E 1. Introduction 1.1. Scope This document provides an overview of the programming requirements for the Si4704/05/06/07/1x/2x/3x/4x/84/85 FM transmitter/AM/FM/SW/LW/WB receiver. The hardware control interface and software commands are detailed along with several examples of the required steps to configure the device for various modes of operation. 2. Overview This family of products is programmed using commands and responses. To perform an action, the system controller writes a command byte and associated arguments, causing the device to execute the given command. The device will, in turn, provide a response depending on the type of command that was sent. Section "4. Commands and Responses" on page 6 and section "5. Commands and Properties" on page 7 describe the procedures for using commands and responses and provide complete lists of commands, properties, and responses. The device has a slave control interface that allows the system controller to send commands to and receive responses from the device using one of three serial protocols (or bus modes): 2-wire mode (I2C and SMBUS compatible), 3-wire mode, or SPI mode. Section "6. Control Interface" on page 223 describes the control interface in detail. Section "7. Powerup" on page 231 describes options for the sequencing of VDD and VIO power supplies, selection of the desired bus mode, provision of the reference clock, RCLK, and sending of the POWER_UP command. Section "8. Powerdown" on page 238 describes sending the POWER_DOWN command and removing VDD and VIO power supplies as necessary. Section "9. Digital Audio Interface" on page 239 describes the digital audio format supported and how to operate the device in digital mode. Section "10. Timing" on page 242 describes the CTS (Clear to Send) timing indicating when the command has been accepted and in most cases completed execution, and the STC (Seek/Tune Complete) timing indicating when the Seek/Tune commands have completed execution. Section "11. FM Transmitter" on page 248 describes the audio dynamic range control, limiter, pre-emphasis, recommendations for maximizing audio volume for the FM transmitter. Section "12. Programming Examples" on page 252 provides flowcharts and step-by-step procedures for programming the device. Rev. 0.7 6/11 Copyright © 2011 by Silicon Laboratories AN332 AN332 Si4700 FM Receiver  Si4701 FM Receiver with RDS  Si4702 FM Receiver  Si4703 FM Receiver with RDS  Si4704 FM Receiver  Package Size (mm) AEC-Q100 Qualified Embedded FM antenna Digital Output Digital Input SAME 4x4  3x3 3x3  2 FM Receiver with RDS   Si47061 High Performance RDS Receiver    1 RPS High Performance RDS 4x4 Si4705 Si4707 WB Receiver with SAME  Si4708 FM Receiver  Si4709 FM Receiver with RDS  Si4710 FM Transmitter  Si4711 FM Transmitter with RDS  Si4712 FM Transmitter with RPS  Si4713 FM Transmitter with RDS & RPS  Si4720 FM Transceiver   Si4721 FM Transceiver with RDS   Si4730 AM/FM Receiver   Si4731 AM/FM Receiver with RDS   Si4734 AM/SW/LW/FM Receiver    Si4735 AM/SW/LW/FM Receiver with RDS    Si4736 AM/FM/WB Receiver    Si4737 AM/FM/WB Receiver with RDS    Si4738 FM/WB Receiver   Si4739 FM/WB Receiver with RDS   Si47401 AM/FM Receiver   3x3   3x3   3x3 3x3  2.5x2.5 2.5x2.5    3x3   3x3    3x3    3x3    3x3    3x3     2 3x3  3x3  2  Rev. 0.7  3x3 Notes: 1. Si4706, Si4707, and Si474x are covered under NDA. 2. High Performance RDS is available in Si4705/31/35/85-D50 and later. 2 RDS WB Receiver SW/LW Receiver AM Receiver General Description FM Receiver Part Number FM Transmitter Table 1. Product Family Function 3x3  3x3  3x3  3x3  3x3   4x4 AN332 Table 1. Product Family Function (Continued) Si47411 AM/FM Receiver with RDS   Si47421 AM/LW/SW/FM/WB Receiver     Si47431 AM/LW/SW/FM/WB Receiver with RDS     Si47441 AM/LW/SW/FM Receiver    Si47451 AM/LW/SW/FM Receiver with RDS    Si47491 High-Performance RDS Receiver Si4784 FM Receiver  Si4785 FM Receiver with RDS              2  4x4  4x4  4x4  4x4  4x4  4x4  3x3  3x3 Notes: 1. Si4706, Si4707, and Si474x are covered under NDA. 2. High Performance RDS is available in Si4705/31/35/85-D50 and later. Rev. 0.7 3 AN332 TABLE O F C ONTENTS 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 4. Commands and Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 5.1. Commands and Properties for the FM/RDS Transmitter (Si4710/11/12/13/20/21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 5.2. Commands and Properties for the FM/RDS Receiver (Si4704/05/06/2x/3x/4x/84/85) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.3. Commands and Properties for the AM/SW/LW Receiver (Si4730/31/34/35/36/37/40/41/42/43/44/45) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124 5.4. Commands and Properties for the WB Receiver (Si4707/36/37/38/39/42/43) . . . . 171 5.5. Commands and Properties for the Stereo Audio ADC Mode (Si4704/05/30/31/34/35) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 6. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 6.1. 2-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 6.2. 3-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 6.3. SPI Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 7. Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 7.1. Powerup from Device Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 7.2. Powerup from a Component Patch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 8. Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 9. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 10. Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 11. FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 11.1. Audio Dynamic Range Control for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . 248 11.2. Audio Pre-emphasis for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 11.3. Audio Limiter for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 11.4. Maximizing Audio Volume for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 12. Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 12.1. Programming Example for the FM/RDS Transmitter . . . . . . . . . . . . . . . . . . . . . . 252 12.2. Programming Example for the FM/RDS Receiver . . . . . . . . . . . . . . . . . . . . . . . . 270 12.3. Programming Example for the AM/LW/SW Receiver . . . . . . . . . . . . . . . . . . . . . . 292 12.4. Programming Example for the WB/SAME Receiver . . . . . . . . . . . . . . . . . . . . . . . 302 Appendix A—Comparison of the Si4704/05/3x-B20,Si4704/05/3x-C40, and Si4704/05/3x-D60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311 Appendix B—Si4704/05/3x-B20/-C40/-D60 Compatibility Checklist . . . . . . . . . . . . . . . . 315 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .320 4 Rev. 0.7 AN332 3. Terminology                  SEN—Serial enable pin, active low; used as device select in 3-wire and SPI operation and address selection in 2-wire operation. SDIO—Serial data in/data out pin. SCLK—Serial clock pin. RST or RSTb—Reset pin, active low RCLK—External reference clock GPO—General purpose output CTS—Clear to send STC—Seek/Tune Complete NVM—Non-volatile internal device memory Device—Refers to the FM Transmitter/AM/FM/SW/LW/WB Receiver System Controller—Refers to the system microcontroller CMD—Command byte COMMANDn—Command register (16-bit) in 3-Wire mode (n = 1 to 4) ARGn—Argument byte (n = 1 to 7) STATUS—Status byte RESPn—Response byte (n = 1 to 15) RESPONSEn—Response register (16-bit) in 3-Wire mode (n = 1 to 8) Rev. 0.7 5 AN332 4. Commands and Responses Commands control actions, such as power up, power down, or tune to a frequency, and are one byte in size. Arguments are specific to a given command and are used to modify the command. For example, after the TX_TUNE_FREQ command, arguments are required to set the tune frequency. Arguments are one byte in size, and each command may require up to seven arguments. Responses provide the system controller status information and are returned after a command and its associated arguments are issued. All commands return a one byte status indicating interrupt state and clear-to-send the next command. Commands may return up to 15 additional response bytes. A complete list of commands is available in “5. Commands and Properties”. Table 2 shows an example of tuning to a frequency using the TX_TUNE_FREQ command. This command requires that a command and three arguments be sent and returns one status byte. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS), or response (RESP). The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. Table 2. Using the TX_TUNE_FREQ Command Action CMD ARG1 ARG2 ARG3 STATUS Data 0x30 0x00 0x27 0x7E 0x80 Description TX_TUNE_FREQ Set Station to 101.1 MHz (0x277E = 10110 with 10 kHz step size) Reply Status. Clear-to-send high. Properties are special command arguments used to modify the default device operation and are generally configured immediately after power-up. Examples of properties are TX _PREEMPHASIS and REFCLK_FREQ. A complete list of properties is available in “5. Commands and Properties”. Table 3 shows an example of setting the REFCLK frequency using the REFCLK_FREQ property by sending the SET_PROPERTY command and five argument bytes. ARG1 of the SET_PROPERTY command is always 0x00. ARG2 and ARG3 are used to select the property number, PROP (0x0201 in this example), and ARG4 and ARG5 are used to set the property value, PROPD (0x8000 or 32768 Hz in the example). Table 3. Using the SET_PROPERTY Command Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x02 0x01 0x80 0x00 0x80 Description SET_PROPERTY REFCLK_FREQ 32768 Hz Reply Status. Clear-to-send high. The implementation of the command and response procedures in the system controller differs for each of the three bus modes. Section "6. Control Interface" on page 223 details the required bit transactions on the control bus for each of the bus modes. 6 Rev. 0.7 AN332 5. Commands and Properties There are four different components for these product families: 1. FM Transmitter component 2. FM Receiver component 3. AM/SW/LW component 4. WB component The following four subsections list all the commands and properties used by each of the component. 5.1. Commands and Properties for the FM/RDS Transmitter (Si4710/11/12/13/20/21) The following two tables are the summary of the commands and properties for the FM/RDS Transmitter component applicable to Si4710/11/12/13/20/21. Table 4. FM/RDS Transmitter Command Summary Cmd Name Description Available In 0x01 POWER_UP Power up device and mode selection. Modes include FM transmit and analog/digital audio interface configuration. All 0x10 GET_REV Returns revision information on the device. All 0x11 POWER_DOWN Power down device. All 0x12 SET_PROPERTY Sets the value of a property. All 0x13 GET_PROPERTY Retrieves a property’s value. All 0x14 GET_INT_STATUS Read interrupt status bits. All 0x15 PATCH_ARGS* Reserved command used for patch file downloads. All 0x16 PATCH_DATA* Reserved command used for patch file downloads. All 0x30 TX_TUNE_FREQ Tunes to given transmit frequency. All 0x31 TX_TUNE_POWER Sets the output power level and tunes the antenna capacitor. All 0x32 TX_TUNE_MEASURE 0x33 TX_TUNE_STATUS 0x34 Measure the received noise level at the specified frequency. Si4712/13/20 /21 Queries the status of a previously sent TX Tune Freq, TX Tune Power, or TX Tune Measure command. All TX_ASQ_STATUS Queries the TX status and input audio signal metrics. All 0x35 TX_RDS_BUFF Queries the status of the RDS Group Buffer and loads new data into buffer. Si4711/13/21 0x36 TX_RDS_PS Set up default PS strings. Si4711/13/21 0x80 GPIO_CTL Configures GPO1, 2, and 3 as output or Hi-Z. All except Si4710-A10 0x81 GPIO_SET Sets GPO1, 2, and 3 output level (low or high). All except Si4710-A10 *Note: Commands PATCH_ARGS and PATCH_DATA are only used to patch firmware. For information on applying a patch file, see "7.2. Powerup from a Component Patch" on page 233. Rev. 0.7 7 AN332 Table 5. FM Transmitter Property Summary Default Available In Enables interrupt sources. 0x0000 All Configures the digital input format. 0x0000 All except Si4710-A10 Configures the digital input sample DIGITAL_INPUT _SAMPLE_RATE1 rate in 1 Hz steps. Default is 0. 0x0000 All except Si4710-A10 0x8000 All Prop Name 0x0001 GPO_IEN 0x0101 DIGITAL_INPUT _FORMAT1 0x0103 Description 0x0201 REFCLK_FREQ Sets frequency of the reference clock in Hz. The range is 31130 to 34406 Hz, or 0 to disable the AFC. Default is 32768 Hz. 0x0202 REFCLK_PRESCALE Sets the prescaler value for the reference clock. 0x0001 All 0x2100 TX_COMPONENT_ENABLE Enable transmit multiplex signal components. Default has pilot and L-R enabled. 0x0003 All 0x2101 TX_AUDIO_DEVIATION Configures audio frequency deviation level. Units are in 10 Hz increments. Default is 6825 (68.25 kHz). 0x1AA9 All 0x2102 TX_PILOT_DEVIATION Configures pilot tone frequency deviation level. Units are in 10 Hz increments. Default is 675 (6.75 kHz) 0x02A3 All 0x2103 TX_RDS_DEVIATION2 Configures the RDS/RBDS frequency deviation level. Units are in 10 Hz increments. Default is 2 kHz. 0x00C8 Si4711/13/21 0x327C All 0x2104 TX_LINE_INPUT_LEVEL Configures maximum analog line input level to the LIN/RIN pins to reach the maximum deviation level programmed into the audio deviation property TX Audio Deviation. Default is 636 mVPK. 0x2105 TX_LINE_INPUT_MUTE Sets line input mute. L and R inputs may be independently muted. Default is not muted. 0x0000 All 0x2106 TX_PREEMPHASIS Configures pre-emphasis time constant. Default is 0 (75 µs). 0x0000 All 0x2107 TX_PILOT_FREQUENCY Configures the frequency of the stereo pilot. Default is 19000 Hz. 0x4A38 All Notes: 1. Digital Audio Input feature (property DIGITAL_INPUT_FORMAT and DIGITAL_INPUT_SAMPLE_RATE) is supported in FMTX component 2.0 or later. 2. RDS feature (command TX_RDS_BUFF, TX_RDS_PS and RDS properties 0x2103, 0x2C00 through 2C07) is supported in FMTX component 2.0 or later. 3. Limiter feature (LIMITEN bit in TX_ACOMP_ENABLE and property TX_LIMITER_RELEASE_TIME) is supported in FMTX component 2.0 or later. 8 Rev. 0.7 AN332 Table 5. FM Transmitter Property Summary (Continued) Name Description Default Available In 0x2200 TX_ACOMP_ENABLE3 Enables audio dynamic range control and limiter. Default is 2 (limiter is enabled, audio dynamic range control is disabled). 0x0002 All 0x2201 TX_ACOMP_THRESHOLD Sets the threshold level for audio dynamic range control. Default is –40 dB. 0xFFD8 All 0x2202 TX_ACOMP_ATTACK_TIME Sets the attack time for audio dynamic range control. Default is 0 (0.5 ms). 0x0000 All 0x2203 TX_ACOMP_RELEASE_TIME Sets the release time for audio dynamic range control. Default is 4 (1000 ms). 0x0004 All 0x2204 TX_ACOMP_GAIN Sets the gain for audio dynamic range control. Default is 15 dB. 0x000F All 0x2205 TX_LIMITER_RELEASE_TIME3 Sets the limiter release time. Default is 102 (5.01 ms) 0x0066 All except Si4710-A10 0x2300 TX_ASQ_INTERRUPT_SOURCE Configures measurements related to signal quality metrics. Default is none selected. 0x0000 All TX_ASQ_LEVEL_LOW Configures low audio input level detection threshold. This threshold can be used to detect silence on the incoming audio. 0x0000 All TX_ASQ_DURATION_LOW Configures the duration which the input audio level must be below the low threshold in order to detect a low audio condition. 0x0000 All TX_ASQ_LEVEL_HIGH Configures high audio input level detection threshold. This threshold can be used to detect activity on the incoming audio. 0x0000 All 0x2304 TX_ASQ_DURATION_HIGH Configures the duration which the input audio level must be above the high threshold in order to detect a high audio condition. 0x0000 All 0x2C00 TX_RDS_INTERRUPT_SOURCE2 Configure RDS interrupt sources. Default is none selected. 0x0000 Si4711/13/21 Prop 0x2301 0x2302 0x2303 Notes: 1. Digital Audio Input feature (property DIGITAL_INPUT_FORMAT and DIGITAL_INPUT_SAMPLE_RATE) is supported in FMTX component 2.0 or later. 2. RDS feature (command TX_RDS_BUFF, TX_RDS_PS and RDS properties 0x2103, 0x2C00 through 2C07) is supported in FMTX component 2.0 or later. 3. Limiter feature (LIMITEN bit in TX_ACOMP_ENABLE and property TX_LIMITER_RELEASE_TIME) is supported in FMTX component 2.0 or later. Rev. 0.7 9 AN332 Table 5. FM Transmitter Property Summary (Continued) Prop Name Description Default Available In 0x2C01 TX_RDS_PI2 Sets transmit RDS program identifier. 0x40A7 Si4711/13/21 0x2C02 TX_RDS_PS_MIX2 Configures mix of RDS PS Group with RDS Group Buffer. 0x0003 Si4711/13/21 0x2C03 TX_RDS_PS_MISC2 Miscellaneous bits to transmit along with RDS_PS Groups. 0x1008 Si4711/13/21 0x2C04 TX_RDS_PS_REPEAT_COUNT2 Number of times to repeat transmission of a PS message before transmitting the next PS message. 0x0003 Si4711/13/21 0x0001 Si4711/13/21 TX_RDS_PS_AF2 RDS Program Service Alternate Frequency. This provides the ability to inform the receiver of a single alternate frequency using AF Method A coding and is transmitted along with the RDS_PS Groups. 0xE0E0 Si4711/13/21 TX_RDS_FIFO_SIZE2 Number of blocks reserved for the FIFO. Note that the value written must be one larger than the desired FIFO size. 0x0000 Si4711/13/21 0x2C05 0x2C06 0x2C07 TX_RDS_PS_MESSAGE_COUNT2 Number of PS messages in use. Notes: 1. Digital Audio Input feature (property DIGITAL_INPUT_FORMAT and DIGITAL_INPUT_SAMPLE_RATE) is supported in FMTX component 2.0 or later. 2. RDS feature (command TX_RDS_BUFF, TX_RDS_PS and RDS properties 0x2103, 0x2C00 through 2C07) is supported in FMTX component 2.0 or later. 3. Limiter feature (LIMITEN bit in TX_ACOMP_ENABLE and property TX_LIMITER_RELEASE_TIME) is supported in FMTX component 2.0 or later. 10 Rev. 0.7 AN332 Table 6. Status Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Bit Name Function 7 CTS Clear to Send. 0 = Wait before sending next command. 1 = Clear to send next command. 6 ERR Error. 0 = No error 1 = Error 5:3 Reserved Values may vary. 2 RDSINT RDS Interrupt. 0 = RDS interrupt has not been triggered. 1 = RDS interrupt has been triggered. 1 ASQINT Signal Quality Interrupt. 0 = Signal quality measurement has not been triggered. 1 = Signal quality measurement has been triggered. STCINT Seek/Tune Complete Interrupt. 0 = Tune complete has not been triggered. 1 = Tune complete has been triggered. 0 Rev. 0.7 11 AN332 5.1.1. Commands and Properties for the FM/RDS Transmitter Command 0x01. POWER_UP Initiates the boot process to move the device from powerdown to powerup mode. The boot can occur from internal device memory or a system controller downloaded patch. To confirm that the patch is compatible with the internal device library revision, the library revision should be confirmed by issuing the POWER_UP command with Function = 15 (query library ID). The device will return the response, including the library revision, and then moves into powerdown mode. The device can then be placed in powerup mode by issuing the POWER_UP command with Function = 2 (transmit) and the patch may be applied. Only the STATUS byte will be returned in the response stream in transmit mode. The POWER_UP command configures the state of DIN (pin 13), DFS (pin 14), and RIN (pin 15) and LIN (pin 16) for analog or digital audio modes and GPO2/INT (pin 18) for interrupt operation. The command configures GPO2/INT interrupts (GPO2OEN) and CTS interrupts (CTSIEN). If both are enabled, GPO2/INT is driven high during normal operation and low for a minimum of 1 µs during the interrupt. The CTSIEN bit is duplicated in the GPO_IEN property. The command is complete when the CTS bit (and optional interrupt) is set. Note: To change function (e.g., FM TX to FM RX), issue the POWER_DOWN command to stop the current function; then, issue POWER_UP to start the new function. Available in: All Command Arguments: Two Response Bytes: None (FUNC = 2), Seven (FUNC = 15) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 0 0 0 0 1 ARG1 CTSIEN GPO2OEN PATCH XOSCEN OPMODE[7:0] ARG2 ARG Bit Name 1 7 CTSIEN 12 FUNC[3:0] 1 6 GPO2OEN 1 5 PATCH 1 4 XOSCEN Function CTS Interrupt Enable. 0 = CTS interrupt disabled. 1 = CTS interrupt enabled. GPO2 Output Enable. 0 = GPO2 output disabled, (Hi-Z). 1 = GPO2 output enabled. Patch Enable. 0 = Boot normally 1 = Copy non-volatile memory to RAM, but do not boot. After CTS has been set, RAM may be patched Crystal Oscillator Enable. 0 = Use external RCLK (crystal oscillator disabled). 1 = Use crystal oscillator (RCLK and GPO3/DCLK with external 32.768 kHz crystal and OPMODE=01010000). See Si47xx Data Sheet Application Schematic for external BOM details. Rev. 0.7 AN332 ARG Bit Name 1 3:0 FUNC[3:0] 2 7:0 OPMODE[7:0] Function Function. 0–1, 3–14 = Reserved. 2 = Transmit. 15 = Query Library ID. Application Setting 01010000 = Analog audio inputs (LIN/RIN) 00001111 = Digital audio inputs (DIN/DFS/DCLK) Response (to FUNC = 2, TX) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Response (to FUNC = 15, Query Library ID) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 RESERVED[7:0] RESP5 RESERVED[7:0] RESP6 CHIPREV[7:0] RESP7 LIBRARYID[7:0] RESP Bit Name Function 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision. 3 7:0 FWMINOR[7:0] Firmware Minor Revision. 4 7:0 RESERVED[7:0] Reserved, various values. 5 7:0 RESERVED[7:0] Reserved, various values. 6 7:0 CHIPREV[7:0] 7 7:0 LIBRARYID[7:0] Final 2 digits of part number. Chip Revision. Library Revision. Rev. 0.7 13 AN332 Command 0x10. GET_REV Returns the part number, chip revision, firmware revision, patch revision and component revision numbers. The command is complete when the CTS bit (and optional interrupt) is set. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: Eight Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 PATCHH[7:0] RESP5 PATCHL[7:0] RESP6 CMPMAJOR[7:0] RESP7 CMPMINOR[7:0] RESP8 CHIPREV[7:0] RESP Bit Name 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision 3 7:0 FWMINOR[7:0] Firmware Minor Revision 4 7:0 PATCHH[7:0] Patch ID High Byte 5 7:0 PATCHL[7:0] Patch ID Low Byte 6 7:0 CMPMAJOR[7:0] Component Major Revision 7 7:0 CMPMINOR[7:0] Component Minor Revision 8 7:0 CHIPREV[7:0] 14 Function Final 2 digits of Part Number Chip Revision Rev. 0.7 AN332 Command 0x11. POWER_DOWN Moves the device from powerup to powerdown mode. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note that only the POWER_UP command is accepted in powerdown mode. If the system controller writes a command other than POWER_UP when in powerdown mode, the device does not respond. The device will only respond when a POWER_UP command is written. GPO pins are powered down and not active during this state. For optimal power down current, GPO2 must be either internally driven low through GPIO_CTL command or externally driven low. Note: In FMTX component 1.0 and 2.0, a reset is required when the system controller writes a command other than POWER_UP when in powerdown mode. Note: The following describes the state of all the pins when in powerdown mode: GPIO1, GPIO2, and GPIO3 = 0 DIN, DFS, RIN, LIN = HiZ Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 1 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Response Rev. 0.7 15 AN332 Command 0x12. SET_PROPERTY Sets a property shown in Table 5, “FM Transmitter Property Summary,” on page 8. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. See Figure 30, “CTS and SET_PROPERTY Command Complete tCOMP Timing Model,” on page 243 and Table 48, “Command Timing Parameters for the FM Transmitter,” on page 244. Available in: All Command Arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG4 PROPDH[7:0] ARG5 PROPDL[7:0] ARG Bit Name Function 1 7:0 Reserved Always write to 0. 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to modify. See Section "5.1.2. FM/RDS Transmitter Properties" on page 31. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to modify. See Section "5.1.2. FM/RDS Transmitter Properties" on page 31. 4 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPVL is used to set the property value. See Section "5.1.2. FM/RDS Transmitter Properties" on page 31. 5 7:0 PROPDL[7:0] Property Value Low Byte. This byte in combination with PROPVH is used to set the property value. See Section "5.1.2. FM/RDS Transmitter Properties" on page 31. Response 16 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 Command 0x13. GET_PROPERTY Gets a property shown in Table 5, “FM Transmitter Property Summary,” on page 8. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: Three Response bytes: Three Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG Bit Name Function 1 7:0 Reserved 2 7:0 PROPH[7:0] Property Get High Byte. This byte in combination with PROPL is used to specify the property to get. 3 7:0 PROPL[7:0] Property Get Low Byte. This byte in combination with PROPH is used to specify the property to get. Always write to 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT RESP1 X X X X X X X X RESP2 PROPDH[7:0] RESP3 PROPDL[7:0] RESP Bit Name Function 1 7:0 Reserved 2 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPVL will represent the requested property value. 3 7:0 PROPDL[7:0] Property Value High Byte. This byte in combination with PROPVH will represent the requested property value. Reserved, various values. Rev. 0.7 17 AN332 Command 0x14. GET_INT_STATUS Updates bits 6:0 of the status byte. This command should be called after any command that sets the STCINT, ASQINT, or RDSINT bits. When polling this command should be periodically called to monitor the STATUS byte, and when using interrupts, this command should be called after the interrupt is set to update the STATUS byte. The command is complete when the CTS bit (and optional interrupt) is set. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 1 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT 18 Rev. 0.7 AN332 Command 0x30. TX_TUNE_FREQ Sets the state of the RF carrier and sets the tuning frequency between 76 and 108 MHz in 10 kHz units and steps of 50 kHz. For example 76.05 MHz = 7605 is valid because it follows the 50 kHz step requirement but 76.01 MHz = 7601 is not valid. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STC bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 48, “Command Timing Parameters for the FM Transmitter,” on page 244. Available in: All Command arguments: Three Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 0 0 0 ARG1 0 0 0 0 0 0 0 0 ARG2 FREQH[7:0] ARG3 FREQL[7:0] ARG Bit Name 1 7:0 Reserved Function Always write to 0. 2 7:0 FREQH[7:0] 3 7:0 FREQL[7:0] Tune Frequency High Byte. This byte in combination with FREQL selects the tune frequency in units of 10 kHz. The valid range is from 7600 to 10800 (76–108 MHz). The frequency must be a multiple of 50 kHz. Tune Frequency Low Byte. This byte in combination with FREQH selects the tune frequency in units of 10 kHz. The valid range is from 7600 to 10800 (76–108 MHz). The frequency must be a multiple of 50 kHz. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 19 AN332 Command 0x31. TX_TUNE_POWER Sets the RF voltage level between 88 dBµV and 115 dBµV in 1 dB units. Power may be set as high as 120 dBµV; however, voltage accuracy is not guaranteed. A value of 0x00 indicates off. The command also sets the antenna tuning capacitance. A value of 0 indicates autotuning, and a value of 1–191 indicates a manual override. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STC bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 48, “Command Timing Parameters for the FM Transmitter,” on page 244. Available in: All Command arguments: Four Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 0 0 1 ARG1 0 0 0 0 0 0 0 0 ARG2 0 0 0 0 0 0 0 0 ARG3 RFdBµV[7:0] ARG4 ANTCAP[7:0] ARG Bit Name Function 1 7:0 Reserved Always write to 0. 2 7:0 Reserved 3 7:0 RFdBµV[7:0] 4 7:0 ANTCAP[7:0] Always write to 0. Tune Power Byte. Sets the tune power in dBµV in 1 dB steps. The valid range is from 88– 115 dBµV. Power may be set as high as 120 dBµV; however, voltage accuracy is not guaranteed. Antenna Tuning Capacitor. This selects the value of the antenna tuning capacitor manually, or automatically if set to zero. The valid range is 0 to 191, which results in a tuning capacitance of 0.25 pF x ANTCAP. Response 20 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 Command 0x32. TX_TUNE_MEASURE Enters receive mode (disables transmitter output power) and measures the received noise level (RNL) in units of dBµV on the selected frequency. The command sets the tuning frequency between 76 and 108 MHz in 10 kHz units and steps of 50 kHz. For example 76.05 MHz = 7605 is valid because it follows the 50 kHz step requirement but 76.01 MHz = 7601 is not valid. The command also sets the antenna tuning capacitance. A value of 0 indicates autotuning, and a value of 1–191 indicates a manual override. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STC bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 48, “Command Timing Parameters for the FM Transmitter,” on page 244. Available in: Si4712/13/20/21 Command arguments: Four Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 0 ARG2 FREQH[7:0] ARG3 FREQL[7:0] ARG4 ANTCAP[7:0] ARG Bit Name Function 1 7:0 Reserved Always write to 0. 2 7:0 FREQH[7:0] 3 7:0 FREQL[7:0] 4 7:0 ANTCAP[7:0] Tune Frequency High Byte. This byte in combination with FREQL selects the tune frequency in units of 10 kHz. In FM mode the valid range is from 7600 to 10800 (76–108 MHz). The frequency must be a multiple of 50 kHz. Tune Frequency Low Byte. This byte in combination with FREQH selects the tune frequency in units of 10 kHz. In FM mode the valid range is from 7600 to 10800 (76–108 MHz). The frequency must be a multiple of 50 kHz. Antenna Tuning Capacitor. This selects the value of the antenna tuning capacitor manually, or automatic if set to zero. The valid range is 0–191. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 21 AN332 Command 0x33. TX_TUNE_STATUS Returns the status of the TX_TUNE_FREQ, TX_TUNE_MEASURE, or TX_TUNE_POWER commands. The command returns the current frequency, output voltage in dBµV (if applicable), the antenna tuning capacitance value (0–191) and the received noise level (if applicable). The command clears the STCINT interrupt bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Seven Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 INTACK ARG Bit Name Function 1 7:1 Reserved 1 0 INTACK Always write to 0. Seek/Tune Interrupt Clear. If set this bit clears the seek/tune complete interrupt status indicator. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT RESP1 X X X X X X X X X X X RESP2 READFREQH[7:0] RESP3 READFREQL[7:0] RESP4 22 X X X X X RESP5 READRFdBµV[7:0] RESP6 READANTCAP[7:0] RESP7 RNL[7:0] Rev. 0.7 AN332 RESP Bit Name 1 7:0 Reserved 2 7:0 3 7:0 4 7:0 5 7:0 6 7:0 7 7:0 Function Returns various data. Read Frequency High Byte. READFREQH[7:0] This byte in combination with READFREQL returns frequency being tuned. Read Frequency Low Byte. READFREQL[7:0] This byte in combination with READFREQH returns frequency being tuned. Reserved Returns various data. Read Power. READRFdBµV[7:0] Returns the transmit output voltage setting. Read Antenna Tuning Capacitor. READANTCAP [7:0] This byte will contain the current antenna tuning capacitor value. Read Received Noise Level (Si4712/13 Only). This byte will contain the receive level as the response to a TX Tune MeaRNL[7:0] sure command. The returned value will be the last RNL measurement (or 0 if no measurement has been performed) for the TX Tune Freq and TX Tune Power commands. Rev. 0.7 23 AN332 Command 0x34. TX_ASQ_STATUS Returns status information about the audio signal quality and current FM transmit frequency. This command can be used to check if the input audio stream is below a low threshold as reported by the IALL bit, or above a high threshold as reported by the IALH bit. The thresholds can be configured to detect a silence condition or an activity condition which can then be used by the host to take an appropriate action such as turning off the carrier in the case of prolonged silence. The thresholds are set using the TX_ASQ_LEVEL_LOW and TX_ASQ_LEVEL_HIGH properties. The audio must be above or below the threshold for greater than the amount of time specified in the TX_ASQ_DURATION_LOW and TX_ASQ_DURATION_HIGH properties for the status to be detected. Additionally the command can be used to determine if an overmodulation condition has occurred or the limiter has engaged, as reported by the OVERMOD bit, in which case the host could reduce the audio level to the part. If any of the OVERMOD, IALH, or IALL bits are set, the ASQINT bit will also be set. The ASQINT bit can be routed to a hardware interrupt via the GPO_IEN property. Clearing the IALH or IALL interrupts will result in the TX_ASQ_DURATION_LOW or TX_ASQ_DURATION_HIGH counters being rearmed, respectively, to start another detection interval measurement. The command clears the ASQINT interrupt bit and OVERMOD, IALH, and IALL bits when the INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note that the TX_ASQ_DURATION_LOW and TX_ASQ_DURATION_HIGH counters start and the TX_ASQ_STATUS command will only return valid data after a call to TX_TUNE_FREQ, TX_TUNE_POWER, or TX_TUNE_MEASURE. Available in: All Command arguments: One Response bytes: Four Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 1 0 0 ARG1 0 0 0 0 0 0 0 INTACK ARG Bit Name 1 0 INTACK 24 Function Interrupt Acknowledge. 0 = Interrupt status preserved. 1 = Clears ASQINT, OVERMOD, IALDH, and IALDL. Rev. 0.7 AN332 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT RESP1 X X X X X OVERMOD IALH IALL RESP2 X X X X X X X X RESP3 X X X X X X X X RESP4 INLEVEL[7:0] RESP Bit Name Function 1 2 OVERMOD 1 1 IALH 1 0 IALL 2 7:0 Reserved Returns various values. 3 7:0 Reserved Returns various values. 4 7:0 INLEVEL[7:0] Overmodulation Detection. 0 = Output signal is below requested modulation level. 1 = Output signal is above requested modulation level. Input Audio Level Threshold Detect High. 0 = Input audio level high threshold not exceeded. 1 = Input audio level high threshold exceeded. Input Audio Level Threshold Detect Low. 0 = Input audio level low threshold not exceeded. 1 = Input audio level low threshold exceeded. Input Audio Level. The current audio input level measured in dBfs (2s complement notation). Rev. 0.7 25 AN332 Command 0x35. TX_RDS_BUFF Loads or clears the RDS group buffer FIFO or circular buffer and returns the FIFO status. The buffer can be allocated between the circular buffer and FIFO with the TX_RDS_FIFO_SIZE property. A common use case for the circular buffer is to broadcast group 2A radio text, and a common use case for the FIFO is to broadcast group 4A real time clock. The command clears the INTACK interrupt bit when the INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note: TX_RDS_BUFF is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Command arguments: Seven Response bytes: Five Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 1 0 1 ARG1 FIFO 0 0 0 0 LDBUFF MTBUFF INTACK ARG2 RDSBH[7:0] ARG3 RDSBL[7:0] ARG4 RDSCH[7:0] ARG5 RDSCL[7:0] ARG6 RDSDH[7:0] ARG7 RDSDL[7:0] ARG Bit Name 1 7 FIFO 1 6:3 Reserved 26 1 2 LDBUFF 1 1 MTBUFF 1 0 INTACK 2 7:0 RDSBH[7:0] Function Operate on FIFO. If set, the command operates on the FIFO buffer. If cleared, the command operates on the circular buffer. Always write to 0. Load RDS Group Buffer. If set, loads the RDS group buffer with RDSB, RDSC, and RDSD. Block A data is generated from the RDS_TX_PI property when the buffer is transmitted. Empty RDS Group Buffer. If set, empties the RDS group buffer. Clear RDS Group buffer interrupt. If set this bit clears the RDS group buffer interrupt indicator. RDS Block B High Byte. This byte in combination with RDSBL sets the RDS block B data. Rev. 0.7 AN332 ARG Bit Name Function 3 7:0 RDSBL[7:0] RDS Block B Low Byte. This byte in combination with RDSBH sets the RDS block B data. 4 7:0 RDSCH[7:0] RDS Block C High Byte. This byte in combination with RDSCL sets the RDS block C data. 5 7:0 RDSCL[7:0] RDS Block C Low Byte. This byte in combination with RDSCH sets the RDS block C data. 6 7:0 RDSDH[7:0] RDS Block D High Byte. This byte in combination with RDSDL sets the RDS block D data. 7 7:0 RDSDL[7:0] RDS Block D Low Byte. This byte in combination with RDSDH sets the RDS block D data. Response Bit D7 D6 STATUS CTS ERR X RESP1 X D5 D4 D3 D2 D1 D0 X X X RDSINT ASQINT STCINT X RDSPSXMIT CBUFXMIT FIFOXMIT CBUFWRAP FIFOMT RESP2 CBAVAIL[7:0] RESP3 CBUSED[7:0] RESP4 FIFOAVAIL[7:0] RESP5 FIFOUSED[7:0] RESP Bit Name Function 1 7:5 Reserved 1 4 RDSPSXMIT 1 3 CBUFXMIT Interrupt source: RDS Group has been transmitted from the FIFO buffer. 1 2 FIFOXMIT Interrupt source: RDS Group has been transmitted from the circular buffer. 1 1 CBUFWRAP 1 0 FIFOMT 2 7:0 CBAVAIL[7:0] Returns the number of available Circular Buffer blocks. 3 7:0 CBUSED[7:0] Returns the number of used Circular Buffer blocks. 4 7:0 FIFOAVAIL[7:0] Returns the number of available FIFO blocks. 5 7:0 FIFOUSED[7:0] Returns the number of used FIFO blocks. Values may vary. Interrupt source: RDS PS Group has been transmitted. Interrupt source: RDS Group Circular Buffer has wrapped. Interrupt source: RDS Group FIFO Buffer is empty. Rev. 0.7 27 AN332 Command 0x36. TX_RDS_PS Loads or clears the program service buffer. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note: TX_RDS_PS is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Command arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 1 0 1 1 0 ARG1 0 0 0 PSID[4:0] ARG2 PSCHAR0 [7:0] ARG3 PSCHAR1 [7:0] ARG4 PSCHAR2 [7:0] ARG5 PSCHAR3 [7:0] ARG Bit Name Function 1 7:5 Reserved Always write to 0. Selects which PS data to load (0–23) 0 = First 4 characters of PS0. 1 = Last 4 characters of PS0. 2 = First 4 characters of PS1. 3 = Last 4 characters of PS1. . . . 22 = First 4 characters of PS11. 23 = Last 4 characters of PS11. RDS PSID CHAR0. First character of selected PSID. 1 4:0 PSID[4:0] 2 7:0 PSCHAR0[7:0] 3 7:0 PSCHAR1[7:0] RDS PSID CHAR1. Second character of selected PSID. 4 7:0 PSCHAR2[7:0] RDS PSID CHAR2. Third character of selected PSID. 5 7:0 PSCHAR3[7:0] RDS PSID CHAR3. Fourth character of selected PSID. Response 28 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 Command 0x80. GPIO_CTL Enables output for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output (Hi-Z or active drive) by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit. The state (high or low) of GPO1, 2, and 3 is set with the GPIO_SET command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is all GPO pins set for high impedance. Notes: 1. GPIO_CTL is fully supported in FMTX component 3.0 or later. Only bit GPO3OEN is supported in FMTX comp 2.0. 2. The use of GPO2 as an interrupt pin and/or the use of GPO3 as DCLK digital clock input will override this GPIO_CTL function for GPO2 and/or GPO3 respectively. Available in: All except Si4710-A10 Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 0 ARG1 0 0 0 0 ARG Bit Name 1 7:4 Reserved GPO3OEN GPO2OEN GPO1OEN 0 Function Always write 0. GPO3 Output Enable. 1 3 GPO3OEN 1 2 GPO2OEN 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO2 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO1 Output Enable. 1 1 GPO1OEN 1 0 Reserved 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. Always write 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 29 AN332 Command 0x81. GPIO_SET Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is all GPO pins set for high impedance. Note: GPIO_SET is fully-supported in FMTX comp 3.0 or later. Only bit GPO3LEVEL is supported in FMTX comp 2.0. Available in: All except Si4710-A10 Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 1 ARG1 0 0 0 0 GPO3LEVEL GPO2LEVEL GPO1LEVEL 0 ARG Bit Name 1 7:4 Reserved Function Always write 0. GPO3 Output Level. 1 3 GPO3LEVEL 1 2 GPO2LEVEL 0 = Output low (default). 1 = Output high. GPO3 Output Level. 0 = Output low (default). 1 = Output high. GPO3 Output Level. 1 1 GPO1LEVEL 1 0 Reserved 0 = Output low (default). 1 = Output high. Always write 0. Response 30 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 5.1.2. FM/RDS Transmitter Properties Property 0x0001. GPO_IEN Configures the sources for the GPO2/INT interrupt pin. Valid sources are the lower 8 bits of the STATUS byte, including CTS, ERR, RDSINT, ASQINT, and STCINT bits. The corresponding bit is set before the interrupt occurs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The CTS interrupt enable (CTSIEN) can be set with this property and the POWER_UP command. The state of the CTSIEN bit set during the POWER_UP command can be read by reading the this property and modified by writing this property. This property may only be set or read when in powerup mode. The default is no interrupts enabled. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 D11 0 0 0 0 0 D10 D9 D8 D7 D6 RDSREP ASQREP STCREP CTSIEN ERRIEN D5 D4 D3 0 0 0 Bit Name 15:11 Reserved Always write to 0. 10 RDSREP RDS Interrupt Repeat. (Si4711/13/21 Only) 0 = No interrupt generated when RDSINT is already set (default). 1 = Interrupt generated even if RDSINT is already set. 9 ASQREP ASQ Interrupt Repeat. 0 = No interrupt generated when ASQREP is already set (default). 1 = Interrupt generated even if ASQREP is already set. 8 STCREP 7 CTSIEN 6 ERRIEN 5:3 Reserved 2 RDSIEN 1 ASQIEN 0 STCIEN D2 D1 D0 RDSIEN ASQIEN STCIEN Function STC Interrupt Repeat. 0 = No interrupt generated when STCREP is already set (default). 1 = Interrupt generated even if STCREP is already set. CTS Interrupt Enable. 0 = No interrupt generated when CTS is set (default). 1 = Interrupt generated when CTS is set. After PowerUp, this bit will reflect the CTSIEN bit in ARG1 of PowerUp Command. ERR Interrupt Enable. 0 = No interrupt generated when ERR is set (default). 1 = Interrupt generated when ERR is set. Always write to 0. RDS Interrupt Enable (Si4711/13/21 Only). 0 = No interrupt generated when RDSINT is set (default). 1 = Interrupt generated when RDSINT is set. Audio Signal Quality Interrupt Enable. 0 = No interrupt generated when ASQINT is set (default). 1 = Interrupt generated when ASQINT is set. Seek/Tune Complete Interrupt Enable. 0 = No interrupt generated when STCINT is set (default). 1 = Interrupt generated when STCINT is set. Rev. 0.7 31 AN332 Property 0x0101. DIGITAL_INPUT_FORMAT Configures the digital input format. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: DIGITAL_INPUT_FORMAT is supported in FMTX component 2.0 or later. Available in: All except Si4710-A10 Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 IFALL Bit Name 15:8 Reserved D6 D5 IMODE[3:0] Function Always write to 0. DCLK Falling Edge. 7 IFALL 0 = Sample on DCLK rising edge (default). 1 = Sample on DCLK falling edge. Digital Mode. 6:3 IMODE[3:0] 2 IMONO 0000 = default 0001 = I2S Mode. 0111 = Left-justified mode. 1101 = MSB at 1st DCLK rising edge after DFS Pulse. 1001 = MSB at 2nd DCLK rising edge after DFS Pulse. Mono Audio Mode. 0 = Stereo audio mode (default). 1 = Mono audio mode. Digital Audio Sample Precision. 1:0 32 ISIZE[1:0] 00 = 16 bits (default) 01 = 20 bits 10 = 24 bits 11 = 8 bits Rev. 0.7 D4 D3 D2 D1 D0 IMONO ISIZE[1:0] AN332 Property 0x0103. DIGITAL_INPUT_SAMPLE_RATE Configures the digital input sample rate in 1 Hz units. The input sample rate must be set to 0 before removing the DCLK input or reducing the DCLK frequency below 2 MHz. If this guideline is not followed, a device reset will be required. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. TX_TUNE_FREQ command must be sent after the POWER_UP command to start the internal clocking before setting this property. Note: DIGITAL_INPUT_SAMPLE_RATE is supported in FMTX component 2.0 or later. Available in: All except Si4710-A10 Default: 0x0000 Units: 1 Hz Step: 1 Hz Range: 0, 32000-48000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D6 D5 D4 D3 D2 D1 D0 DISR[15:0] Name Bit D7 Name Function Digital Input Sample Rate. 15:0 DISR 0 = Disabled. Required before removing DCLK or reducing DCLK frequency below 2 MHz. The range is 32000–48000 Hz. Rev. 0.7 33 AN332 Property 0x0201. REFCLK_FREQ Sets the frequency of the REFCLK from the output of the prescaler. (Figure 1 shows the relation between RCLK and REFCLK.) The REFCLK range is 31130 to 34406 Hz (32768 ±5% Hz) in 1 Hz steps, or 0 (to disable AFC). For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz REFCLK. The reference clock frequency property would then need to be set to 32500 Hz. RCLK frequencies between 31130 Hz and 40 MHz are supported, however, there are gaps in frequency coverage for prescaler values ranging from 1 to 10, or frequencies up to 311300 Hz. Table 7 summarizes these RCLK gaps. PIN 9 RCLK 31.130 kHz – 40 MHz Prescaler Divide by 1-4095 REFCLK 31.130 kHz – 34.406 kHz Figure 1. REFCLK Prescaler Table 7. RCLK Gaps Prescaler RCLK Low (Hz) RCLK High (Hz) 1 31130 34406 2 62260 68812 3 93390 103218 4 124520 137624 5 155650 172030 6 186780 206436 7 217910 240842 8 249040 275248 9 280170 309654 10 311300 344060 The RCLK must be valid 10 ns before and 10 ns after sending the TX_TUNE_MEASURE, TX_TUNE_FREQ, or TX_TUNE_POWER commands. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 32768 Hz. Available in: All Default: 0x8000 (32768) Units: 1 Hz Step: 1 Hz Range: 31130–34406 34 Rev. 0.7 AN332 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 REFCLKF[15:0] Name Bit Name Function 15:0 REFCLKF[15:0] Frequency of Reference Clock in Hz. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 ±5%), or 0 (to disable AFC). Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 4095 in 1 unit steps. For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before and 10 ns after sending the TX_TUNE_MEASURE, TX_TUNE_FREQ, or TX_TUNE_POWER commands. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1–4095 Bit D15 D14 D13 D12 Name 0 0 0 RCLK SEL Bit Name 15:13 Reserved 12 RCLKSEL 11:0 REFCLKP[11:0] D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RCLKP[11:0] Function Always write to 0. RCLKSEL. 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. Prescaler for Reference Clock. Integer number used to divide the RCLK frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 ±5%), or 0 (to disable AFC). Rev. 0.7 35 AN332 Property 0x2100. TX_COMPONENT_ENABLE Individually enables the stereo pilot, left minus right stereo and RDS components. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is stereo pilot and left minus right stereo components enabled. Available in: All Default: 0x0003 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:3 Reserved 2 RDS 1 LMR 0 PILOT D2 D1 D0 RDS LMR PILOT Function Always write 0. RDS Enable (Si4711/13/21 Only). 0 = Disables RDS (default). 1 = Enables RDS to be transmitted. Left Minus Right. 0 = Disables Left Minus Right. 1 = Enables Left minus Right (Stereo) to be transmitted (default). Pilot Tone. 0 = Disables Pilot. 1 = Enables the Pilot tone to be transmitted (default). Property 0x2101. TX_AUDIO_DEVIATION Sets the transmit audio deviation from 0 to 90 kHz in 10 Hz units. The sum of the audio deviation, pilot deviation and RDS deviation should not exceed regulatory requirements, typically 75 kHz. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 6825, or 68.25 kHz. Available in: All Default: 0x1AA9 (6825) Units: 10 Hz Step: 10 Hz Range: 0–9000 Bit D15 D14 D13 15:0 36 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 TXADEV[15:0] Name Bit D12 Name TXADEV[15:0] Function Transmit Audio Frequency Deviation. Audio frequency deviation is programmable from 0 Hz to 90 kHz in 10 Hz units. Default is 6825 (68.25 kHz). Note that the total deviation of the audio, pilot, and RDS must be less than 75 kHz to meet regulatory requirements. Rev. 0.7 AN332 Property 0x2102. TX_PILOT_DEVIATION Sets the transmit pilot deviation from 0 to 90 kHz in 10 Hz units. The sum of the audio deviation, pilot deviation and RDS deviation should not exceed regulatory requirements, typically 75 kHz. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 675, or 6.75 kHz. Available in: All Default: 0x02A3 (675) Units: 10 Hz Step: 10 Hz Range: 0–9000 Bit D15 D14 D13 D12 D11 D10 D9 D7 D6 D5 D4 D3 D2 D1 D0 TXPDEV[15:0] Name Bit 15:0 D8 Name Function TXPDEV[15:0] Transmit Pilot Frequency Deviation. Pilot tone frequency deviation is programmable from 0 Hz to 90 kHz in 10 Hz units. Default is 675 (6.75 kHz). Note that the total deviation of the audio, pilot, and RDS must be less than 75 kHz to meet regulatory requirements. Property 0x2103. TX_RDS_DEVIATION Sets the RDS deviation from 0 to 7.5 kHz in 10 Hz units. The sum of the audio deviation, pilot deviation and RDS deviation should not exceed regulatory requirements, typically 75 kHz. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 200, or 2 kHz. Available in: Si4711/13/21 Default: 0x00C8 (200) Units: 10 Hz Step: 10 Hz Range: 0–9000 Bit D15 D14 D13 15:0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 TXRDEV[15:0] Name Bit D12 Name TXRDEV[15:0] Function Transmit RDS Frequency Deviation. RDS frequency deviation is programmable from 0 Hz to 90 kHz in 10 Hz units. Default is 200 (2 kHz). Note that the total deviation of the audio, pilot, and RDS must be less than 75 kHz to meet regulatory requirements. Rev. 0.7 37 AN332 Property 0x2104. TX_LINE_INPUT_LEVEL Sets the input resistance and maximum audio input level for the LIN/RIN pins. An application providing a 150 mVPK input to the device on RIN/LIN would set Line Attenuation = 00, resulting in a maximum permissible input level of 190 mVPK on LIN/RIN and an input resistance of 396 k. The Line Level would be set to 150 mV to correspond to the TX audio deviation level set by the TX_AUDIO_DEVIATION property. An application providing a 1 VPK input to the device on RIN/LIN would set Line Attenuation = 11, resulting in a maximum permissible input level of 636 mVPK on LIN/RIN and an input resistance of 60 k. An external series resistor on LIN and RIN inputs of 40 k would create a resistive voltage divider that would keep the maximum line level on RIN/LIN below 636 mVPK. The Line Level would be set to 636 mVPK to correspond to the TX audio deviation level set by the TX_AUDIO_DEVIATION property. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default input level and peak line level is 636 mVPK with an input impedance of 60 k. Available in: All Default: 0x327C Bit D15 D14 Name 0 0 Bit Name 15:14 Reserved D13 LIATTEN[1:0] 13:12 LIATTEN[1:0] 11:10 Reserved 9:0 38 D12 LILEVEL[9:0] D11 D10 0 0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LILEVEL[9:0] Function Always write to 0. Line Attenuation. 00 = Max input level = 190 mVPK; input resistance = 396 k 01 = Max input level = 301 mVPK; input resistance = 100 k 10 = Max input level = 416 mVPK; input resistance = 74 k 11 = Max input level = 636 mVPK; input resistance = 60 k(default) Always write to 0. Line Level. Maximum line amplitude level on the LIN/RIN pins in mVPK. The default is 0x27C or 636 mVPK. Rev. 0.7 AN332 Property 0x2105. TX_LINE_INPUT_MUTE Selectively mutes the left and right audio inputs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:2 Reserved 1 LIMUTE 0 RIMUTE D1 D0 LIMUTE RIMUTE Function Always write to 0. Mutes L Line Input. 0 = No mute (default) 1 = Mute Mutes R Line Input. 0 = No mute (default) 1 = Mute Property 0x2106. TX_PREEMPHASIS Sets the transmit pre-emphasis to 50 µs, 75 µs or off. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 75 µs. Available in: All Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:2 Reserved Always write to 0. FMPE[1:0] FM Pre-Emphasis. 00 = 75 µs. Used in USA (default) 01 = 50 µs. Used in Europe, Australia, Japan 10 = Disabled 11 = Reserved 1:0 D1 D0 FMPE[1:0] Function Rev. 0.7 39 AN332 Property 0x2107. TX_PILOT_FREQUENCY This property is used to set the frequency of the stereo pilot in 1 Hz steps. The stereo pilot is nominally set to 19 kHz for stereo operation, however the pilot can be set to any frequency from 0 Hz to 19 kHz to support the generation of an audible test tone. The pilot tone is enabled by setting the PILOT bit (D0) of the TX_COMPONENT_ENABLE property. When using the stereo pilot as an audible test generator it is recommended that the RDS bit (D2) be disabled. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x4A38 (19000) Units: 1 Hz Step: 1 Hz Range: 0–19000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FREQ[15:0] Name Bit Name 15:0 Function Stereo Pilot Frequency Sets the frequency of the stereo pilot in 1 Hz steps. Range 0 Hz–19000 Hz (default is 0x4A38 or 19 kHz). FREQ Property 0x2200. TX_ACOMP_ENABLE Selectively enables the audio dynamic range control and limiter. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is limiter enabled and audio dynamic range control disabled. Note: LIMITEN bit is supported in FMTX component 2.0 or later. Reset this bit to 0 in FMTX component 1.0. Available in: All Default: 0x0002 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:2 Reserved 40 1 LIMITEN 0 ACEN Function Always write to 0. Audio Limiter. 0 = Disable 1 = Enable (default) Transmit Audio Dynamic Range Control Enable. 0 = Audio dynamic range control disabled (default) 1 = Audio dynamic range control enabled Rev. 0.7 D1 D0 LIMITEN ACEN AN332 Property 0x2201. TX_ACOMP_THRESHOLD Sets the threshold for audio dynamic range control from 0 dBFS to –40 dBFS in 1 dB units in 2's complement notation. For example, a setting of –40 dB would be 65536 – 40 = 65496 = 0xFFD8. The threshold is the level below which the device applies the gain set by the TX_ACOMP_GAIN property, and above which the device applies the compression defined by (gain + threshold) / threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0xFFD8, or –40 dBFS. Available in: All Default: 0xFFD8 (–40) Units: 1 dB Step: 1 dB Range: –40 to 0 Bit D15 D14 15:0 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 THRESHOLD[15:0] Name Bit D13 Name Function Transmit Audio Dynamic Range Control Threshold. THRESHOLD[15:0] Range is from –40 to 0 dBFS in 1 dB steps (0xFFD8–0x0). Default is 0xFFD8 (–40 dBFS). Rev. 0.7 41 AN332 Property 0x2202. TX_ACOMP_ATTACK_TIME Sets the time required for the device to respond to audio level transitions from below the threshold in the gain region to above the threshold in the compression region. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0.5 ms, or 0. Available in: All Default: 0x0000 Range: 0–9 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:4 Reserved 3:0 42 ATTACK[3:0] Function Always write to 0. Transmit Audio Dynamic Range Control Attack Time. 0 = 0.5 ms (default) 1 = 1.0 ms 2 = 1.5 ms 3 = 2.0 ms 4 = 2.5 ms 5 = 3.0 ms 6 = 3.5 ms 7 = 4.0 ms 8 = 4.5 ms 9 = 5.0 ms Rev. 0.7 D3 D2 D1 ATTACK[3:0] D0 AN332 Property 0x2203. TX_ACOMP_RELEASE_TIME Sets the time required for the device to respond to audio level transitions from above the threshold in the compression region to below the threshold in the gain region. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1000 ms, or 4. Available in: All Default: 0x0004 Range: 0–4 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:3 Reserved 2:0 D2 D1 D0 RELEASE[2:0] Function Always write to 0. Transmit Audio Dynamic Range Control Release Time. 0 = 100 ms 1 = 200 ms 2 = 350 ms 3 = 525 ms 4 = 1000 ms (default) RELEASE[2:0] Property 0x2204. TX_ACOMP_GAIN Sets the gain for audio dynamic range control from 0 to 20 dB in 1 dB units. For example, a setting of 15 dB would be 15 = 0xF. The gain is applied to the audio below the threshold set by the TX_ACOMP_THRESHOLD property. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 15 dB or 0xF. Available in: All Default: 0x000F (15) Units: 1 dB Step: 1 dB Range: 0–20 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 GAIN[5:0] Name Bit Name Function 15:6 Reserved Always write to 0. 5:0 GAIN[5:0] Transmit Audio Dynamic Range Control Gain. Range is from 0 to 20 dB in 1 dB steps. Default is 15. Rev. 0.7 43 AN332 Property 0x2205. TX_LIMITER_RELEASE_TIME Sets the time required for the device to respond to audio level transitions from above the limiter threshold to below the limiter threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 5.01 ms, or 102. Note: TX_LIMITER_RELEASE_TIME is supported in FMTX component 2.0 or later. Available in: All except Si4710-A10 Default 0x0066 (102) Step: 1 Range: 5–2000 Bit D15 D14 15:0 44 D12 D11 D10 D9 D8 D7 D6 LIMITERTC[15:0] Name Bit D13 Name Function Sets the limiter release time. 5 = 102.39 ms 6 = 85.33 ms 7 = 73.14 ms 8 = 63.99 ms 10 = 51.19 ms 13 = 39.38 ms 17 = 30.11 ms 25 = 20.47 ms 51 = 10.03 ms LMITERTC[15:0] 57 = 8.97 ms 64 = 7.99 ms 73 = 7.01 ms 85 = 6.02 ms 102 = 5.01 ms (default) 127 = 4.02 ms 170 = 3.00 ms 255 = 2.00 ms 510 = 1.00 ms 1000 = 0.50 ms 2000 = 0.25 ms Rev. 0.7 D5 D4 D3 D2 D1 D0 AN332 Property 0x2300. TX_ASQ_INTERRUPT_SELECT This property is used to enable which Audio Signal Quality (ASQ) measurements trigger ASQ_INT bit in the TX_ASQ_STATUS command. OVERMODIEN bit enables ASQ interrupt by the OVERMOD bit, which turns on with overmodulation of the FM output signal due to excessive input signal level. IALHIEN and IALLIEN bits enable ASQ interrupt by the IALH and IALL bits, which report high or low input audio condition. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 0 0 0 Bit Name 15:3 Reserved 2 OVERMODIEN 1 IALHIEN 0 IALLIEN 0 0 0 0 0 0 0 0 0 0 D2 D1 D0 OVERMODIEN IALHIEN IALLIEN Function Always write to 0. Overmodulation Detection Enable. 0 = OVERMOD detect disabled (default). 1 = OVERMOD detect enabled. Input Audio Level Detection High Threshold Enable. 0 = IALH detect disabled (default). 1 = IALH detect enabled. Input Audio Level Detection Low Threshold Enable. 0 = IALL detect disabled (default). 1 = IALL detect enabled. Rev. 0.7 45 AN332 Property 0x2301. TX_ASQ_LEVEL_LOW This property sets the low audio level threshold relative to 0 dBFS in 1 dB increments, which is used to trigger the IALL bit. This threshold can be set to detect a silence condition in the input audio allowing the host to take an appropriate action such as disabling the RF carrier or powering down the chip. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0x0000 and the range is 0 to –70. Available in: All Default: 0x0000 Units: 1 dB Step: 1 dB Range: –70 to 0 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 15:8 Reserved 7:0 D7 D6 D5 D4 D3 D2 D1 D0 IALLTH[7:0] Function Always write to 0. Input Audio Level Low Threshold. IALLTH[7:0] Threshold which input audio level must be below in order to detect a low audio condition. Specified in units of dBFS in 1 dB steps (–70 .. 0). Default is 0. Property 0x2302. TX_ASQ_DURATION_LOW This property is used to determine the duration (in 1 ms increments) that the input signal must be below the TX_ASQ_LEVEL_LOW threshold in order for an IALL condition to be generated. The range is 0 ms to 65535 ms, and the default is 0 ms. Note that the TX_ASQ_DURATION_LOW and TX_ASQ_DURATION_HIGH counters start and the TX_ASQ_STATUS command will only return valid data after a call to TX_TUNE_FREQ, TX_TUNE_POWER, or TX_TUNE_MEASURE. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Units: 1 ms Step: 1 ms Range: 0–65535 Bit D15 D14 15:0 46 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 IALLDUR[15:0] Name Bit D13 Name Function Input Audio Level Duration Low. IALLDUR[15:0] Required duration the input audio level must fall below IALLTH to trigger an IALL interrupt. Specified in 1mS increments (0–65535 ms). Default is 0. Rev. 0.7 AN332 Property 0x2303. TX_ASQ_LEVEL_HIGH This property sets the high audio level threshold relative to 0 dBFS in 1 dB increments, which is used to trigger the IALH bit. This threshold can be set to detect an activity condition in the input audio allowing the host to take an appropriate action such as enabling the RF carrier after an extended silent period. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0x0000 and the range is 0 to –70. Available in: All Default: 0x0000 Units: 1 dB Step: 1 dB Range: –70 to 0 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 15:8 Reserved 7:0 D7 D6 D5 D4 D3 D2 D1 D0 IALHTH[7:0] Function Always write to 0. Input Audio Level High Threshold IALHTH[7:0] Threshold which input audio level must be above in order to detect a high audio condition. Specified in units of dBFS in 1 dB steps (–70 .. 0). Default is 0. Rev. 0.7 47 AN332 Property 0x2304. TX_ASQ_DURATION_HIGH This property is used to determine the duration (in 1 ms increments) that the input signal must be above the TX_ASQ_LEVEL_HIGH threshold in order for a IALH condition to be generated. The range is 0 to 65535 ms, and the default is 0 ms. Note that the TX_ASQ_DURATION_LOW and TX_ASQ_DURATION_HIGH counters start and the TX_ASQ_STATUS command will only return valid data after a call to TX_TUNE_FREQ, TX_TUNE_POWER, or TX_TUNE_MEASURE. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Units: 1 ms Step: 1 ms Range: 0–65535 Bit D15 D14 15:0 48 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 IALHDUR[15:0] Name Bit D13 Name Function Input Audio Level Duration High. IALHDUR[15:0] Required duration the input audio level must exceed IALHTH to trigger an IALH interrupt. Specified in 1 ms increments (0 – 65535 ms). Default is 0. Rev. 0.7 AN332 Property 0x2C00. TX_RDS_INTERRUPT_SOURCE Configures the RDS interrupt sources. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_INTERRUPT_SOURCE is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x0000 Bit Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 0 0 0 0 0 0 0 0 0 0 0 D4 D3 D2 D1 D0 RDS RDS RDSRDS RDSFIPSXMIT CBUFXMIT FIFOXMIT CBUFWRAP FOMT Bit Name Function 4 RDSPSXMIT 0 = Do not interrupt (default). 1 = Interrupt when a RDS PS Group has been transmitted. The interrupt occurs when a PS group begins transmission. 3 RDSCBUFXMIT 0 = Do not interrupt (default). 1 = Interrupt when a RDS Group has been transmitted from the Circular Buffer. The interrupt occurs when a group is fetched from the buffer. 2 RDSFIFOXMIT 0 = Do not interrupt (default). 1 = Interrupt when a RDS Group has been transmitted from the FIFO Buffer. The interrupt occurs when a group is fetched from the buffer. 1 RDSCBUFWRAP 0 = Do not interrupt (default). 1 = Interrupt when the RDS Group Circular Buffer has wrapped. The interrupt occurs when the last group is fetched from the buffer. 0 RDSFIFOMT 0 = Do not interrupt (default). 1 = Interrupt when the RDS Group FIFO Buffer is empty. The interrupt occurs when the last group is fetched from the FIFO. Rev. 0.7 49 AN332 Property 0x2C01. TX_RDS_PI Sets the RDS PI code to be transmitted in block A and block C (for type B groups). The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PI is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x40A7 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RDSPI[15:0] Name Bit Name 15:0 RDSPI[15:0] Function Transmit RDS Program Identifier. RDS program identifier data. Property 0x2C02. TX_RDS_PS_MIX Sets the ratio of RDS PS (group 0A) and circular buffer/FIFO groups. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PS_MIX is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x0003 Range: 0–6 Bit Name D15 D14 D13 D12 D11 D10 0 0 Bit Name 15:3 Reserved 2:0 50 0 RDSPSMIX[2:0] 0 0 0 D9 D8 D7 D6 D5 D4 D3 0 0 0 0 0 0 0 Function Always write to 0. Transmit RDS Mix. 000 = Only send RDS PS if RDS Group Buffer is empty 001 = Send RDS PS 12.5% of the time 010 = Send RDS PS 25% of the time 011 = Send RDS PS 50% of the time (default) 100 = Send RDS PS 75% of the time 101 = Send RDS PS 87.5% of the time 110 = Send RDS PS 100% of the time Rev. 0.7 D2 D1 D0 RDSPSMIX[2:0] AN332 Property 0x2C03. TX_RDS_PS_MISC Configures miscellaneous RDS flags. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PS_MISC is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x1008 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 Name RDSD3 RDSD2 RDSD1 RDSD0 FORCEB RDSTP RDSPTY[4:0] Bit Name 15 RDSD3 14 RDSD2 13 RDSD1 12 RDSD0 11 FORCEB 10 RDSTP Traffic Program Code (default = 0). 9:5 RDSPTY[4:0] Program Type Code (default = 0). 4 RDSTA Traffic Announcement Code (default = 0). 3 RDSMS Music/Speech Switch Code. 0 = Speech. 1 = Music (default). 2:0 Reserved D4 D3 D2 D1 D0 RDSTA RDSMS 0 0 0 Function Dynamic PTY code. 0 = Static PTY (default). 1 = Indicates that the PTY code is dynamically switched. Compressed code. 0 = Not compressed (default). 1 = Compressed. Artificial Head code. 0 = Not artificial head (default). 1 = Artificial head. Mono/Stereo code. 0 = Mono. 1 = Stereo (default). Use the PTY and TP set here in all block B data. 0 = FIFO and BUFFER use PTY and TP as when written (default). 1 = FIFO and BUFFER force PTY and TP to be the settings in this property. Always write to 0. Rev. 0.7 51 AN332 Property 0x2C04. TX_RDS_PS_REPEAT_COUNT Sets the number of times a program service group 0A is repeated. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PS_REPEAT_COUNT is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x0003 Range: 1–255 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 15:8 Reserved 7:0 D7 D6 D5 D4 D3 D2 D1 D0 RDSPSRC[7:0] Function Always write to 0. RDSPSRC[7:0] Transmit RDS PS Repeat Count. Number of times to repeat transmission of a PS message before transmitting the next PS message. Property 0x2C05. TX_RDS_PS_MESSAGE_COUNT Sets the number of program service messages through which to cycle. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PS_MESSAGE_COUNT is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x0001 Range 1–12 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:4 Reserved 3:0 RDSPSMC[3:0] 52 Function Always write to 0. Transmit RDS PS Message Count. Number of PS messages to cycle through. Default is 1. Rev. 0.7 D3 D2 D1 RDSPSMC[3:0] D0 AN332 Property 0x2C06. TX_RDS_PS_AF Sets the AF RDS Program Service Alternate Frequency. This provides the ability to inform the receiver of a single alternate frequency using AF Method A coding and is transmitted along with the RDS_PS Groups. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_PS_AF is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0xE0E0 Range: 0xE000–0xE0CC Bit D15 D14 D13 15:0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RDSAF[15:0] Name Bit D12 Name RDSAF[15:0] Function Transmit RDS Program Service Alternate Frequency. 0xE101 = 1 AF @ 87.6 MHz 0xE102 = 1 AF @ 87.7 MHz ... 0xE1CB = 1 AF @ 107.8 MHz 0xE1CC = 1 AF @ 107.9 MHz 0xE0E0 = No AF exists (default) Rev. 0.7 53 AN332 Property 0x2C07. TX_RDS_FIFO_SIZE Sets the RDS FIFO size in number of blocks. Note that the value written must be one larger than the desired FIFO size. The number of blocks allocated will reduce the size of the Circular RDS Group Buffer by the same amount. For instance, if RDSFIFOSZ = 20, then the RDS Circular Buffer will be reduced by 20 blocks. The minimum number of blocks which should be allocated is 4. This provides enough room for a single group of any type (xA or xB) to be transmitted. Groups xA require 3 Blocks, Groups xB require 2 Blocks as block C' is always the same as the RDS PI code. Before setting this value, determine the available blocks through the TX_RDS_FIFO command, as the buffer size may vary between versions or part numbers. The guaranteed minimum FIFO size, however, is 53 blocks. The RDS FIFO and the RDS Circular Buffer should be emptied with the TX_RDS_FIFO command prior to changing the size of the FIFO. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Note: TX_RDS_FIFO_SIZE is supported in FMTX component 2.0 or later. Available in: Si4711/13/21 Default: 0x0000 Units: blocks Step: 3 blocks Range: 0, 4, 7, 10–54 Note: Actual maximum FIFO size returned by the TX_RDS_BUFF command is larger, however, this is 53 blocks is the guaranteed FIFO size. Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 15:8 Reserved 7:0 RDSFIFOSZ[7:0] 54 D7 D6 D5 Rev. 0.7 D3 D2 RDSFIFOSZ[7:0] Function Always write 0. Transmit RDS FIFO Size. 0 = FIFO disabled (default) D4 D1 D0 AN332 5.2. Commands and Properties for the FM/RDS Receiver (Si4704/05/06/2x/3x/4x/84/85) Tables 8 and 9 summarize the commands and properties for the FM/RDS Receiver component applicable to Si4704/05/06/2x/3x/4x/84/85. Table 8. FM/RDS Receiver Command Summary Cmd Name 0x01 POWER_UP 0x10 GET_REV 0x11 Description Available In Power up device and mode selection. All Returns revision information on the device. All POWER_DOWN Power down device. All 0x12 SET_PROPERTY Sets the value of a property. All 0x13 GET_PROPERTY Retrieves a property’s value. All 0x14 GET_INT_STATUS Reads interrupt status bits. All 0x15 PATCH_ARGS* Reserved command used for patch file downloads. All 0x16 PATCH_DATA* Reserved command used for patch file downloads. All 0x20 FM_TUNE_FREQ Selects the FM tuning frequency. All 0x21 FM_SEEK_START Begins searching for a valid frequency. All 0x22 FM_TUNE_STATUS Queries the status of previous FM_TUNE_FREQ or FM_SEEK_START command. All 0x23 FM_RSQ_STATUS Queries the status of the Received Signal Quality (RSQ) of the current channel. All 0x24 FM_RDS_STATUS Si4705/06, Si4721, Si474x, Returns RDS information for current channel and reads an entry from Si4731/35/37/39, RDS FIFO. Si4785 0x27 FM_AGC_STATUS Queries the current AGC settings All 0x28 FM_AGC_OVERRIDE Override AGC setting by disabling and forcing it to a fixed value All 0x80 GPIO_CTL Configures GPO1, 2, and 3 as output or Hi-Z. All except Si4730-A10 0x81 GPIO_SET Sets GPO1, 2, and 3 output level (low or high). All except Si4730-A10 *Note: Commands PATCH_ARGS and PATCH_DATA are only used to patch firmware. For information on applying a patch file, see "7.2. Powerup from a Component Patch" on page 233. Rev. 0.7 55 AN332 Table 9. FM/RDS Receiver Property Summary Prop Name 0x0001 GPO_IEN 0x0102 DIGITAL_OUTPUT_ FORMAT Default Available In 0x0000 All 0x0000 Si4705/06, Si4721/31/35/37/ 39, Si4730/34/36/38D60 and later, Si4741/43/45, Si4784/85 Configure digital audio output sample rate. 0x0000 Si4705/06, Si4721/31/35/37/ 39, Si4730/34/36/38D60 and later, Si4741/43/45, Si4784/85 Description Enables interrupt sources. Configure digital audio outputs. 0x0104 DIGITAL_OUTPUT_ SAMPLE_RATE 0x0201 REFCLK_FREQ Sets frequency of reference clock in Hz. The range is 31130 to 34406 Hz, or 0 to disable the AFC. Default is 32768 Hz. 0x8000 All 0x0202 REFCLK_PRESCALE Sets the prescaler value for RCLK input. 0x0001 All 0x1100 FM_DEEMPHASIS Sets deemphasis time constant. Default is 75 µs. 0x0002 All except Si4749 0x1102 FM_CHANNEL_FILTER Selects bandwidth of channel filter applied at the demodulation stage. 0x0001 Si4706, Si4749, Si4704/05/30/31/ 34/35/84/85-D50 and later 0x1105 FM_BLEND_STEREO_ THRESHOLD Selects bandwidth of channel filter applied at the demodulation stage. 0x0031 Si470x/2x, Si473x-C40 and earlier 0x1106 FM_BLEND_MONO_ THRESHOLD Sets RSSI threshold for mono blend (Full mono below threshold, blend above threshold). To force stereo set this to 0. To force mono set this to 127. Default value is 30 dBµV. 0x001E Si470x/2x, Si473x-C40 and earlier 0x1107 FM_ANTENNA_INPUT Selects the antenna type and the pin to which it is connected. 0x0000 Si4704/05/06/20/ 21 0x1108 FM_MAX_TUNE_ ERROR 0x1200 FM_RSQ_INT_ SOURCE 0x1201 0x1202 56 0x001E Sets the maximum freq error allowed before setting the AFC rail (AFCRL) indicator. Default value is 20 kHz. 0x0014 All All others Configures interrupt related to Received Signal Quality metrics. 0x0000 All FM_RSQ_SNR_HI_ THRESHOLD Sets high threshold for SNR interrupt. 0x007F All FM_RSQ_SNR_LO_ THRESHOLD Sets low threshold for SNR interrupt. 0x0000 All Rev. 0.7 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Prop Name 0x1203 FM_RSQ_RSSI_HI_ THRESHOLD 0x1204 FM_RSQ_RSSI_LO_ THRESHOLD 0x1205 FM_RSQ_MULTIPATH_HI_ THRESHOLD 0x1206 FM_RSQ_MULTIPATH_ LO_THRESHOLD 0x1207 FM_RSQ_BLEND_ THRESHOLD 0x1300 FM_SOFT_MUTE_RATE 0x1301 FM_SOFT_MUTE_SLOPE 0x1302 FM_SOFT_MUTE_ MAX_ATTENUATION 0x1303 FM_SOFT_MUTE_ SNR_THRESHOLD 0x1304 0x1305 FM_SOFT_MUTE_ RELEASE_RATE FM_SOFT_MUTE_ ATTACK_RATE Default Available In Sets high threshold for RSSI interrupt. 0x007F All Sets low threshold for RSSI interrupt. 0x0000 All 0x007F Si4706-C30 and later, Si474x, Si4704/05/30/31/ 34/35/84/85-D50 and later Sets low threshold for multipath interrupt. 0x0000 Si4706-C30 and later, Si474x, Si4704/05/30/31/ 34/35/84/85-D50 and later Sets the blend threshold for blend interrupt when boundary is crossed. 0x0081 All except Si4749 Description Sets high threshold for multipath interrupt. 0x0040 Si4706/07/20/21/ 84/85-B20 and earlier, Si4704/05/3xC40 and earlier Configures attenuation slope during soft mute in dB attenuation per dB SNR below the soft mute SNR threshold. Default value is 2. 0x0002 Si4704/05/06/3xC40 and later, Si4740/41/42/43/ 44/45 Sets maximum attenuation during soft mute (dB). Set to 0 to disable soft mute. Default is 16 dB. 0x0010 All except Si4749 Sets SNR threshold to engage soft mute. Default is 4 dB. 0x0004 All except Si4749 Sets the attack and decay rates when entering and leaving soft mute. Sets soft mute release rate. Smaller values provide slower release, and larger values provide faster release. The default is 8192 (approximately 8000 dB/s) Sets soft mute attack rate. Smaller values provide slower attack, and larger values provide faster attack. The default is 8192 (approximately 8000 dB/s) Rev. 0.7 0x2000 Si4706-C30 and later, Si4740/41/42/43/ 44/45, Si4704/05/30/31/ 34/35/84/85-D50 and later 0x2000 Si4706-C30 and later, Si4740/41/42/43/ 44/45, Si4704/05/30/31/ 34/35/84/85-D50 and later 57 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Default Available In Sets the bottom of the FM band for seek. Default is 8750 (87.5 MHz). 0x222E All Sets the top of the FM band for seek. Default is 10790 (107.9 MHz). 0x2A26 All FM_SEEK_FREQ_ SPACING Selects frequency spacing for FM seek. Default value is 10 (100 kHz). 0x000A All 0x1403 FM_SEEK_TUNE_ SNR_THRESHOLD Sets the SNR threshold for a valid FM Seek/Tune. Default value is 3 dB. 0x0003 All 0x1404 FM_SEEK_TUNE_ RSSI_TRESHOLD Sets the RSSI threshold for a valid FM Seek/Tune. Default value is 20 dBµV. 0x0014 All 0x0000 Si4705/06, Si4721, Si431/35/37/39, Si4741/43/45/49 0x0000 Si4705/06, Si4721, Si431/35/37/39, Si4741/43/45/49 0x0000 Si4705/06, Si4721, Si431/35/37/39, Si4741/43/45/49 Prop Name 0x1400 FM_SEEK_BAND_ BOTTOM 0x1401 FM_SEEK_BAND_TOP 0x1402 0x1500 RDS_INT_SOURCE 0x1501 RDS_INT_FIFO_ COUNT 0x1502 0x1503 0x1700 RDS_CONFIG Description Configures RDS interrupt behavior. Sets the minimum number of RDS groups stored in the receive FIFO required before RDSRECV is set. Configures RDS setting. FM_RDS_CONFIDENCE Sets the confidence level threshold for each RDS block. 0x1111 Si4706-C30 and later, Si474x, Si4704/05/30/31/ 34/35/84/85-D50 and later FM_AGC_ATTACK_RATE Sets the AGC attack rate. Larger values provide slower attack and smaller values provide faster attack. The default is 4 (approximately 1500 dB/s). 0x0004 Si474x 0x008C Si474x 0x0031 Si4706-C30 and later, Si4740/41/42/43/ 44/45, Si4705/31/35/85D50 and later 0x001E Si4706-C30 and later, Si4740/41/42/ 43/44/45, Si4705/31/35/85 -D50 and later 0x1701 Sets the AGC release rate. Larger values provide slower release and smaller values FM_AGC_RELEASE_RATE provide faster release. The default is 140 (approximately 43 dB/s). 0x1800 Sets RSSI threshold for stereo blend. (Full stereo above threshold, blend below threshold.) To force stereo, set this to 0. To force mono, set this to 127. Default value is 49 dBμV. 0x1801 58 FM_BLEND_RSSI_ STEREO_THRESHOLD Sets RSSI threshold for mono blend (Full mono below threshold, blend above FM_BLEND_RSSI_MONO_ threshold). To force stereo, set this to 0. To THRESHOLD force mono, set this to 127. Default value is 30 dBμV. Rev. 0.7 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Prop 0x1802 0x1803 0x1804 0x1805 Name Description FM_BLEND_RSSI_ ATTACK_RATE Sets the stereo to mono attack rate for RSSI based blend. Smaller values provide slower attack and larger values provide faster attack. The default is 4000 (approximately 16 ms). FM_BLEND_RSSI_ RELEASE_RATE Sets the mono to stereo release rate for RSSI based blend. Smaller values provide slower release and larger values provide faster release. The default is 400 (approximately 164 ms). FM_BLEND_SNR_ STEREO_THRESHOLD FM_BLEND_SNR_MONO_ THRESHOLD Sets SNR threshold for stereo blend (Full stereo above threshold, blend below threshold). To force stereo, set this to 0. To force mono, set this to 127. Default value is 27 dB. Sets SNR threshold for mono blend (Full mono below threshold, blend above threshold). To force stereo, set this to 0. To force mono, set this to 127. Default value is 14 dB. Sets the stereo to mono attack rate for SNR based blend. Smaller values provide FM_BLEND_SNR_ATTACK_ 0x1806 slower attack and larger values provide RATE faster attack. The default is 4000 (approximately 16 ms). Rev. 0.7 Default Available In 0x0FA0 Si4706-C30 and later, Si4740/41/42/ 43/44/45, Si4705/31/35/85 -D50 and later 0x0190 Si4706-C30 and later, Si4740/41/42/ 43/44/45, Si4705/31/35/85 -D50 and later 0x001B Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later 0x000E Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later 0x0FA0 Si4740/41/42/ 43/44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35 /84/85-D50 and later 59 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Prop 0x1807 0x1808 0x1809 0x180A 0x180B 60 Name FM_BLEND_SNR_ RELEASE_RATE FM_BLEND_MULTIPATH_ STEREO_THRESHOLD Description Sets the mono to stereo release rate for SNR based blend. Smaller values provide slower release and larger values provide faster release. The default is 400 (approximately 164 ms). Sets multipath threshold for stereo blend (Full stereo below threshold, blend above threshold). To force stereo, set this to 100. To force mono, set this to 0. Default value is 20. Sets Multipath threshold for mono blend FM_BLEND_MULTIPATH_M (Full mono above threshold, blend below ONO_THRESHOLD threshold). To force stereo, set to 100. To force mono, set to 0. The default is 60. Default Available In 0x0190 Si4740/41/42/ 43/44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35 /84/85-D50 and later 0x0014 Si4740/41/42/ 43/44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, 0x003C Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later FM_BLEND_MULTIPATH_ ATTACK_RATE Si4740/41/42/43/ 44/45, Sets the stereo to mono attack rate for MulSi4704/05-D50 tipath based blend. Smaller values provide and later, slower attack and larger values provide 0x0FA0 Si4706-C30 and faster attack. The default is 4000 (approxilater , mately 16 ms). Si4730/31/34/35/ 84/85-D50 and later FM_BLEND_MULTIPATH_ RELEASE_RATE Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Sets the mono to stereo release rate for Multipath based blend. Smaller values provide slower release and larger values provide faster release. The default is 40 (approximately 1.64 s). Rev. 0.7 0x0028 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Prop 0x180C Name Description FM_BLEND_MAX_STEREO Sets the maximum amount of stereo _SEPARATION separation Default Available In 0x0000 Si474x 0x1900 FM_NB_DETECT_ THRESHOLD Sets the threshold for detecting impulses in dB above the noise floor. Default value is 16. 0x0010 Si4742/43/44/45 0x1901 FM_NB_INTERVAL Interval in micro-seconds that original samples are replaced by interpolated clean 0x0018 samples. Default value is 24 µs. Si4742/43/44/45 0x1902 FM_NB_RATE Noise blanking rate in 100 Hz units. Default value is 64. 0x0040 Si4742/43/44/45 0x1903 FM_NB_IIR_FILTER Sets the bandwidth of the noise floor estimator Default value is 300. 0x012C Si4742/43/44/45 0x1904 FM_NB_DELAY Delay in micro-seconds before applying impulse blanking to the original samples. Default value is 133. 0x00AA Si4742/43/44/45 0x0018 Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later 0x000F Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later 0x1A00 0x1A01 FM_HICUT_ SNR_HIGH_ THRESHOLD FM_HICUT_ SNR_LOW_THRESHOLD Sets the SNR level at which hi-cut begins to band limit. Default value is 24. Sets the SNR level at which hi-cut reaches maximum band limiting. Default value is 15. Si4740/41/42/43/ 44/45, Si4704/05-D50 Sets the rate at which hi-cut lowers the cutand later, 0x1A02 FM_HICUT_ ATTACK_RATE off frequency. Default value is 20000 0x4E20 Si4706-C30 and (approximately 3 ms) later , Si4730/31/34/35/ 84/85-D50 and later Rev. 0.7 61 AN332 Table 9. FM/RDS Receiver Property Summary (Continued) Prop 0x1A03 0x1A04 0x1A05 Name FM_HICUT_ RELEASE_RATE FM_HICUT_ MULTIPATH_TRIGGER THRESHOLD FM_HICUT_ MULTIPATH_END_ THRESHOLD 0x1A06 FM_HICUT_ CUTOFF_FREQUENCY 0x4000 RX_VOLUME 0x4001 RX_HARD_MUTE 62 Default Available In 0x0014 Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Sets the MULTIPATH level at which hi-cut begins to band limit. Default value is 20. 0x0014 Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Sets the MULTIPATH level at which hi-cut reaches maximum band limiting. Default value is 60. Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, 0x003C Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Description Sets the rate at which hi-cut increases the cut-off frequency. Default value is 20. (approximately 3.3 s) Si4740/41/42/43/ 44/45, Si4704/05-D50 and later, Si4706-C30 and later , Si4730/31/34/35/ 84/85-D50 and later Sets the maximum band limit frequency for hi-cut and also sets the maximum audio frequency. Default value is 0 (disabled). 0x0000 Sets the output volume. 0x003F All except Si4749 Mutes the audio output. L and R audio outputs may be muted independently. 0x0000 All except Si4749 Rev. 0.7 AN332 Table 10. Status Response for the FM/RDS Receiver Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Bit Name Function 7 CTS Clear to Send. 0 = Wait before sending next command. 1 = Clear to send next command. 6 ERR Error. 0 = No error 1 = Error 5:4 Reserved Values may vary. 3 RSQINT Received Signal Quality Interrupt. 0 = Received Signal Quality measurement has not been triggered. 1 = Received Signal Quality measurement has been triggered. 2 RDSINT Radio Data System (RDS) Interrupt (Si4705/21/31/35/37/39/85 Only). 0 = Radio data system interrupt has not been triggered. 1 = Radio data system interrupt has been triggered. 1 Reserved Values may vary. 0 STCINT Seek/Tune Complete Interrupt. 0 = Tune complete has not been triggered. 1 = Tune complete has been triggered. Rev. 0.7 63 AN332 5.2.1. FM/RDS Receiver Commands Command 0x01. POWER_UP Initiates the boot process to move the device from powerdown to powerup mode. The boot can occur from internal device memory or a system controller downloaded patch. To confirm that the patch is compatible with the internal device library revision, the library revision should be confirmed by issuing the POWER_UP command with FUNC = 15 (query library ID). The device returns the response, including the library revision, and then moves into powerdown mode. The device can then be placed in powerup mode by issuing the POWER_UP command with FUNC = 0 (FM Receive) and the patch may be applied (See Section "7.2. Powerup from a Component Patch" on page 233). The POWER_UP command configures the state of ROUT (pin 13, Si474x pin 15) and LOUT (pin 14, Si474x pin 16) for analog audio mode and GPO2/INT (pin 18, Si474x pin 20) for interrupt operation. For the Si4705/21/31/35/37/39/84/85-B20, the POWER_UP command also configures the state of GPO3/DCLK (pin 17, Si474x pin 19), DFS (pin 16, Si474x pin 18), and DOUT (pin 15, Si474x pin 17) for digital audio mode. The command configures GPO2/INT interrupts (GPO2OEN) and CTS interrupts (CTSIEN). If both are enabled, GPO2/INT is driven high during normal operation and low for a minimum of 1 µs during the interrupt. The CTSIEN bit is duplicated in the GPO_IEN property. The command is complete when the CTS bit (and optional interrupt) is set. Note: To change function (e.g. FM RX to AM RX or FM RX to FM TX), issue POWER_DOWN command to stop current function; then, issue POWER_UP to start new function. Available in: All Command Arguments: Two Response Bytes: None (FUNC = 0), Seven (FUNC = 15) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 0 0 0 0 1 ARG1 CTSIEN GPO2OEN PATCH XOSCEN OPMODE[7:0] ARG2 ARG Name Function 1 7 CTSIEN CTS Interrupt Enable. 0 = CTS interrupt disabled. 1 = CTS interrupt enabled. 1 6 GPO2OEN GPO2 Output Enable. 0 = GPO2 output disabled. 1 = GPO2 output enabled. 1 64 Bit 5 FUNC[3:0] PATCH Patch Enable. 0 = Boot normally. 1 = Copy NVM to RAM, but do not boot. After CTS has been set, RAM may be patched. Rev. 0.7 AN332 ARG Bit Name Function Crystal Oscillator Enable. Note: Set to 0 for Si4740/41/42/43/44/45/49 1 4 1 3:0 2 7:0 XOSCEN FUNC[3:0] OPMODE[7:0] 0 = Use external RCLK (crystal oscillator disabled). 1 = Use crystal oscillator (RCLK and GPO3/DCLK with external 32.768 kHz crystal and OPMODE=00000101). See Si47xx Data Sheet Application Schematic for external BOM details. Function. 0 = FM Receive. 1–14 = Reserved. 15 = Query Library ID. Application Setting. 00000000 = RDS output only (no audio outputs) Si4749 only 00000101 = Analog audio outputs (LOUT/ROUT). 00001011 = Digital audio output (DCLK, LOUT/DFS, ROUT/DIO) 10110000 = Digital audio outputs (DCLK, DFS, DIO) (Si4705/21/31/35/37/39/41/43/45/84/85 FMRX component 2.0 or later with XOSCEN = 0). 10110101 = Analog and digital audio outputs (LOUT/ROUT and DCLK, DFS, DIO) (Si4705/21/31/35/37/39/41/43/45/84/85 FMRX component 2.0 or later with XOSCEN = 0). Response (FUNC = 0, FM Receive) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Response (FUNC = 15, Query Library ID) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 RESERVED[7:0] RESP5 RESERVED[7:0] RESP6 CHIPREV[7:0] RESP7 LIBRARYID[7:0] RESP Bit Name Function 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision (ASCII). 3 7:0 FWMINOR[7:0] Firmware Minor Revision (ASCII). Final 2 digits of part number (HEX). Rev. 0.7 65 AN332 4 7:0 RESERVED[7:0] Reserved, various values. 5 7:0 RESERVED[7:0] Reserved, various values. 6 7:0 CHIPREV[7:0] Chip Revision (ASCII). 7 7:0 LIBRARYID[7:0] Library Revision (HEX). Command 0x10. GET_REV Returns the part number, chip revision, firmware revision, patch revision and component revision numbers. The command is complete when the CTS bit (and optional interrupt) is set. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: Fifteen (Si4705/06 only), Eight (Si4704/2x/3x/4x) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 0 Response 66 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 PATCHH[7:0] RESP5 PATCHL[7:0] RESP6 CMPMAJOR[7:0] RESP7 CMPMINOR[7:0] RESP8 CHIPREV[7:0] RESP10 Reserved RESP11 Reserved RESP12 Reserved RESP13 Reserved RESP14 Reserved RESP15 CID[7:0] (Si4705 only) Rev. 0.7 AN332 RESP Bit Name Function 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision (ASCII). 3 7:0 FWMINOR[7:0] Firmware Minor Revision (ASCII). 4 7:0 PATCHH[7:0] Patch ID High Byte (HEX). 5 7:0 PATCHL[7:0] Patch ID Low Byte (HEX). 6 7:0 CMPMAJOR[7:0] Component Major Revision (ASCII). 7 7:0 CMPMINOR[7:0] Component Minor Revision (ASCII). 8 7:0 CHIPREV[7:0] 15 7:0 CID[7:0] Final 2 digits of Part Number (HEX). Chip Revision (ASCII). CID (Si4705/06 only). Command 0x11. POWER_DOWN Moves the device from powerup to powerdown mode. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note that only the POWER_UP command is accepted in powerdown mode. If the system controller writes a command other than POWER_UP when in powerdown mode, the device does not respond. The device will only respond when a POWER_UP command is written. GPO pins are powered down and not active during this state. For optimal power down current, GPO2 must be either internally driven low through GPIO_CTL command or externally driven low. Note: In FMRX component 1.0, a reset is required when the system controller writes a command other than POWER_UP when in powerdown mode. Note: The following describes the state of all the pins when in powerdown mode: GPIO1, GPIO2, and GPIO3 = 0 ROUT, LOUT, DOUT, DFS = HiZ Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 1 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Rev. 0.7 67 AN332 Command 0x12. SET_PROPERTY Sets a property shown in Table 9, “FM/RDS Receiver Property Summary,” on page 56. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. See Figure 30, “CTS and SET_PROPERTY Command Complete tCOMP Timing Model,” on page 243 and Table 49, “Command Timing Parameters for the FM Receiver,” on page 245. Available in: All Command Arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG4 PROPDH[7:0] ARG5 PROPDL[7:0] ARG Bit Name 1 7:0 Reserved 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to modify. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to modify. 4 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPDL is used to set the property value. 5 7:0 PROPDL[7:0] Property Value Low Byte. This byte in combination with PROPDH is used to set the property value. 68 Function Always write to 0. Rev. 0.7 AN332 Command 0x13. GET_PROPERTY Gets a property as shown in Table 9, “FM/RDS Receiver Property Summary,” on page 56. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: Three Response bytes: Three Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG Bit Name Function 1 7:0 Reserved 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to get. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to get. Always write to 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 0 0 0 0 0 0 0 0 RESP2 PROPDH[7:0] RESP3 PROPDL[7:0] RESP Bit Name Function 1 7:0 Reserved 2 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPDL represents the requested property value. 3 7:0 PROPDL[7:0] Property Value High Byte. This byte in combination with PROPDH represents the requested property value. Always returns 0. Rev. 0.7 69 AN332 Command 0x14. GET_INT_STATUS Updates bits 6:0 of the status byte. This command should be called after any command that sets the STCINT, RDSINT, or RSQINT bits. When polling this command should be periodically called to monitor the STATUS byte, and when using interrupts, this command should be called after the interrupt is set to update the STATUS byte. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be set when in powerup mode. Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 1 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Command 0x20. FM_TUNE_FREQ Sets the FM Receive to tune a frequency between 64 and 108 MHz in 10 kHz units. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STC bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 49, “Command Timing Parameters for the FM Receiver,” on page 245. FM: LO frequency is 128 kHz above RF for RF frequencies < 90 MHz and 128 kHz below RF for RF frequencies > 90 MHz. For example, LO frequency is 80.128 MHz when tuning to 80.00 MHz. Note: For FMRX components 2.0 or earlier, tuning range is 76–108 MHz. Note: Fast bit is supported in FMRX components 4.0 or later. Note: Freeze bit is supported in FMRX components 4.0 or later. Available in: All Command arguments: Four Response bytes: None 70 Rev. 0.7 AN332 Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 0 0 0 ARG1 0 0 0 0 0 0 FREEZE FAST ARG2 FREQH[7:0] ARG3 FREQL[7:0] ARG4 ANTCAP[7:0] ARG Bit Name Function 1 7:1 Reserved Always write to 0. 1 1 FREEZE Freeze Metrics During Alternate Frequency Jump. If set will cause the blend, hicut, and softmute to transition as a function of the associated attack/release parameters rather than instantaneously when tuning to alternate station. 1 0 FAST FAST Tuning. If set, executes fast and invalidated tune. The tune status will not be accurate. 2 7:0 FREQH[7:0] Tune Frequency High Byte. This byte in combination with FREQL selects the tune frequency in 10 kHz. In FM mode the valid range is from 6400 to 10800 (64–108 MHz). 3 7:0 FREQL[7:0] Tune Frequency Low Byte. This byte in combination with FREQH selects the tune frequency in 10 kHz. In FM mode the valid range is from 6400 to 10800 (64–108 MHz). 4 7:0 ANTCAP[7:0] Antenna Tuning Capacitor (valid only when using TXO/LPI pin as the antenna input). This selects the value of the antenna tuning capacitor manually, or automatically if set to zero. The valid range is 0 to 191. Automatic capacitor tuning is recommended. Note: When tuned manually, the varactor is offset by four codes. For example, if the varactor is set to a value of 5 manually, when read back the value will be 1. The four codes (1pf) delta accounts for the capacitance at the chip. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Rev. 0.7 71 AN332 Command 0x21. FM_SEEK_START Begins searching for a valid frequency. Clears any pending STCINT or RSQINT interrupt status. The CTS bit (and optional interrupt) is set when it is safe to send the next command. RSQINT status is only cleared by the RSQ status command when the INTACK bit is set. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STCINT bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 49, “Command Timing Parameters for the FM Receiver,” on page 245. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 0 0 1 ARG1 0 0 0 0 SEEKUP WRAP 0 0 ARG Bit Name Function 1 7:4 Reserved Always write to 0. 1 3 SEEKUP Seek Up/Down. Determines the direction of the search, either UP = 1, or DOWN = 0. 1 2 WRAP 1 1:0 Reserved Wrap/Halt. Determines whether the seek should Wrap = 1, or Halt = 0 when it hits the band limit. Always write to 0. Response 72 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Rev. 0.7 AN332 Command 0x22. FM_TUNE_STATUS Returns the status of FM_TUNE_FREQ or FM_SEEK_START commands. The command returns the current frequency, RSSI, SNR, multipath, and the antenna tuning capacitance value (0-191). The command clears the STCINT interrupt bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Seven Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 0 1 0 ARG1 0 0 0 0 0 0 CANCEL INTACK ARG Bit Name Function 1 7:2 Reserved Always write to 0. 1 1 CANCEL Cancel seek. If set, aborts a seek currently in progress. 1 0 INTACK Seek/Tune Interrupt Clear. If set, clears the seek/tune complete interrupt status indicator. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 BLTF X X X X X AFCRL VALID RESP2 READFREQH[7:0] RESP3 READFREQL[7:0] RESP4 RSSI[7:0] RESP5 SNR[7:0] RESP6 MULT[7:0] RESP7 READANTCAP[7:0] (Si4704/05/06/2x only) Rev. 0.7 73 AN332 RESP Bit Name Function Band Limit. 1 7 BLTF 1 6:2 Reserved 1 1 AFCRL 1 0 VALID Reports if a seek hit the band limit (WRAP = 0 in FM_START_SEEK) or wrapped to the original frequency (WRAP = 1). Always returns 0. AFC Rail Indicator. Set if the AFC rails. Valid Channel. Set if the channel is currently valid as determined by the seek/tune properties (0x1403, 0x1404, 0x1108) and would have been found during a Seek. Read Frequency High Byte. 2 7:0 READFREQH[7:0] 3 7:0 READFREQL[7:0] 4 7:0 RSSI[7:0] 5 7:0 SNR[7:0] This byte in combination with READFREQL returns frequency being tuned (10 kHz). Read Frequency Low Byte. This byte in combination with READFREQH returns frequency being tuned (10 kHz). Received Signal Strength Indicator. This byte contains the receive signal strength when tune is complete (dBµV). SNR. This byte contains the SNR metric when tune is complete (dB). Multipath. 74 6 7:0 MULT[7:0] 7 7:0 READANTCAP [7:0] This byte contains the multipath metric when tune is complete. Multipath indicator is available only for Si474x, Si4706-C30 and later and Si4704/05/30/31/34/35/84/85 -D50 and later. Read Antenna Tuning Capacitor (Si4704/05/06/2x only). This byte contains the current antenna tuning capacitor value. Rev. 0.7 AN332 Command 0x23. FM_RSQ_STATUS Returns status information about the received signal quality. The commands returns the RSSI, SNR, frequency offset, and stereo blend percentage. It also indicates valid channel (VALID), soft mute engagement (SMUTE), and AFC rail status (AFCRL). This command can be used to check if the received signal is above the RSSI high threshold as reported by RSSIHINT, or below the RSSI low threshold as reported by RSSILINT. It can also be used to check if the signal is above the SNR high threshold as reported by SNRHINT, or below the SNR low threshold as reported by SNRLINT. For the Si4706/4x, it can be used to check if the detected multipath is above the multipath high threshold as reported by MULTHINT, or below the multipath low threshold as reported by MULTLINT. If the PILOT indicator is set, it can also check whether the blend has crossed a threshold as indicated by BLENDINT. The command clears the RSQINT, BLENDINT, SNRHINT, SNRLINT, RSSIHINT, RSSILINT, MULTHINT, and MULTLINT interrupt bits when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Seven Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 0 1 1 ARG1 0 0 0 0 0 0 0 INTACK Bit Name ARG Function INTACK Interrupt Acknowledge. 0 = Interrupt status preserved. 1 = Clears RSQINT, BLENDINT, SNRHINT, SNRLINT, RSSIHINT, RSSILINT, MULTHINT, MULTLINT. Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 BLENDINT X RESP2 X X RESP3 PILOT 1 0 Response MULTHINT MULTLINT X X SNRHINT SMUTE SNRLINT RSSIHINT RSSIILINT X AFCRL VALID STBLEND[6:0] RESP4 RSSI[7:0] RESP5 SNR[7:0] RESP6 MULT[7:0] RESP7 FREQOFF[7:0] Rev. 0.7 75 AN332 RESP Bit Name 1 7 BLENDINT 1 1 5 4 1 3 1 2 1 1 1 0 2 3 2 1 2 0 3 7 3 6:0 4 7:0 5 7:0 6 7:0 MULTHINT MULTLINT Function Blend Detect Interrupt. 0 = Blend is within the Blend threshold settings. 1 = Blend goes above or below the Blend threshold settings. Multipath Detect High (Si474x, Si4706-C30 and later and Si4704/05/30/31/34/35/84/85-D50 and later only). 0 = Detected multipath value has not exceeded above the Multipath high threshold. 1 = Detected multipath value has exceeded above the Multipath high threshold. Multipath Detect Low (Si474x, Si4706-C30 and later and Si4704/05/30/31/34/35/84/85-D50 and later only). 0 = Detected multipath value has not fallen below the Multipath low threshold. 1 = Detected multipath value has fallen below the Multipath low threshold. SNR Detect High. 0 = Received SNR has not exceeded above SNR high threshold. SNRHINT 1 = Received SNR has exceeded above SNR high threshold. SNR Detect Low. SNRLINT 0 = Received SNR has not fallen below SNR low threshold. 1 = Received SNR has fallen below SNR low threshold. RSSI Detect High. RSSIHINT 0 = RSSI has not exceeded above RSSI high threshold. 1 = RSSI has exceeded above RSSI high threshold. RSSI Detect Low. RSSILINT 0 = RSSI has not fallen below RSSI low threshold. 1 = RSSI has fallen below RSSI low threshold. Soft Mute Indicator. SMUTE Indicates soft mute is engaged. AFC Rail Indicator. AFCRL Set if the AFC rails. Valid Channel. VALID Set if the channel is currently valid and would have been found during a Seek. Pilot Indicator. PILOT Indicates stereo pilot presence. Stereo Blend Indicator. STBLEND[6:0] Indicates amount of stereo blend in% (100 = full stereo, 0 = full mono). Received Signal Strength Indicator. RSSI[7:0] Contains the current receive signal strength (0–127 dBµV). SNR. SNR[7:0] Contains the current SNR metric (0–127 dB). MULT[7:0] Multipath (Si474x, Si4706-C30 and later and Si4704/05/30/31/34/35/84/85-D50 and later only). Contains the current multipath metric. (0 = no multipath; 100 = full multipath) 7 76 7:0 FREQOFF[7:0] Frequency Offset. Signed frequency offset (kHz). Rev. 0.7 AN332 Command 0x24. FM_RDS_STATUS Returns RDS information for current channel and reads an entry from the RDS FIFO. RDS information includes synch status, FIFO status, group data (blocks A, B, C, and D), and block errors corrected. This command clears the RDSINT interrupt bit when INTACK bit in ARG1 is set and, if MTFIFO is set, the entire RDS receive FIFO is cleared (FIFO is always cleared during FM_TUNE_FREQ or FM_SEEK_START). The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in power up mode. The FIFO size is 25 groups for FMRX component 2.0 or later, and 14 for FMRX component 1.0. Notes: 1. FM_RDS_STATUS is supported in FMRX component 2.0 or later. 2. MTFIFO is not supported in FMRX component 2.0. Available in: Si4705/06, Si4721, Si474x, Si4731/35/37/39, Si4785 Command arguments: One Response bytes: Twelve Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 1 0 0 ARG1 0 0 0 0 0 STATUSONLY MTFIFO INTACK ARG Bit Name Function Status Only. 1 2 1 1 Determines if data should be removed from the RDS FIFO. 0 = Data in BLOCKA, BLOCKB, BLOCKC, BLOCKD, and BLE contain the oldest STATUSONLY data in the RDS FIFO. 1 = Data in BLOCKA will contain the last valid block A data received for the current station. Data in BLOCKB will contain the last valid block B data received for the current station. Data in BLE will describe the bit errors for the data in BLOCKA and BLOCKB. Empty FIFO MTFIFO 0 = If FIFO not empty, read and remove oldest FIFO entry. 1 = Clear RDS Receive FIFO. Interrupt Acknowledge 1 0 INTACK 0 = RDSINT status preserved. 1 = Clears RDSINT. Response Bit D7 D6 STATUS CTS ERR RESP1 X X RESP2 X X D5 D4 D3 D2 D1 D0 X X RSQINT RDSINT X STCINT RDSNEWBLOCKB RDSNEWBLOCKA X X X X Rev. 0.7 RDSSYNCFOUND RDSSYNCLOST RDSRECV GRPLOST X RDSSYNC 77 AN332 Bit D7 D6 D5 D4 D3 D2 RESP3 RDSFIFOUSED[7:0] RESP4 BLOCKA[15:8] RESP5 BLOCKA[7:0] RESP6 BLOCKB[15:8] RESP7 BLOCKB[7:0] RESP8 BLOCKC[15:8] RESP9 BLOCKC[7:0] RESP10 BLOCKD[15:8] RESP11 BLOCKD[7:0] RESP12 BLEA[1:0] BLEB[1:0] BLEC[1:0] D1 BLED[1:0] RESP Bit Name 1 5 RDSNEWBLOCKB RDS New Block B. 1 = Valid Block B data has been received. 1 4 RDSNEWBLOCKA RDS New Block A. 1 = Valid Block A data has been received. 1 2 RDSSYNCFOUND RDS Sync Found. 1 = Found RDS synchronization. 1 1 RDSSYNCLOST 1 0 RDSRECV RDS Received. 1 = FIFO filled to minimum number of groups set by RDSFIFOCNT. 2 2 GRPLOST Group Lost. 1 = One or more RDS groups discarded due to FIFO overrun. 2 0 RDSSYNC RDS Sync. 1 = RDS currently synchronized. 78 3 7:0 RDSFIFOUSED 4 7:0 BLOCKA[15:8] 5 7:0 BLOCKA[7:0] 6 7:0 BLOCKB[15:8] 7 7:0 BLOCKB[7:0] 8 7:0 BLOCKC[15:8] 9 7:0 BLOCKC[7:0] D0 Function RDS Sync Lost. 1 = Lost RDS synchronization. RDS FIFO Used. Number of groups remaining in the RDS FIFO (0 if empty). If non-zero, BLOCKA-BLOCKD contain the oldest FIFO entry and RDSFIFOUSED decrements by one on the next call to RDS_FIFO_STATUS (assuming no RDS data received in the interim). RDS Block A. Block A group data from oldest FIFO entry if STATUSONLY is 0. Last valid Block A data if STATUSONLY is 1 (Si4749, Si4706-C30 and later and Si4705/31/35/85-D50 and later only). RDS Block B. Block B group data from oldest FIFO entry if STATUSONLY is 0. Last valid Block B data if STATUSONLY is 1 (Si4749, Si4706-C30 and later and Si4705/31/35/85-D50 and later only). RDS Block C. Block C group data from oldest FIFO entry. Rev. 0.7 AN332 RESP Bit Name 10 7:0 BLOCKD[15:8] 11 7:0 BLOCKD[7:0] 12 12 12 12 7:6 5:4 3:2 1:0 Function RDS Block D. Block D group data from oldest FIFO entry. BLEA[1:0] RDS Block A Corrected Errors. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. BLEB[1:0] RDS Block B Corrected Errors. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. BLEC[1:0] RDS Block C Corrected Errors. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. BLED[1:0] RDS Block D Corrected Errors. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. Rev. 0.7 79 AN332 Command 0x27. FM_AGC_STATUS Returns the AGC setting of the device. The command returns whether the AGC is enabled or disabled and it returns the LNA Gain index. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: Two Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 0 1 1 1 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT RESP1 X X X X X X X READ_RF AGCDIS RESP2 X X X Response RESP Bit Name 1 0 READ_RFAGCDIS 2 80 4:0 READ_LNA_GAIN_INDEX READ_LNA_GAIN_INDEX[4:0] Function This bit indicates whether the RF AGC is disabled or not 0 = RF AGC is enabled 1 = RF AGC is disabled These bits returns the value of the LNA GAIN index 0 = Minimum attenuation (max gain) 1 – 25 = Intermediate attenuation 26 = Maximum attenuation (min gain) Note: The max index is subject to change Rev. 0.7 AN332 Command 0x28. FM_AGC_OVERRIDE Overrides AGC setting by disabling the AGC and forcing the LNA to have a certain gain that ranges between 0 (minimum attenuation) and 26 (maximum attenuation). This command may only be sent when in powerup mode. Available in: All Command arguments: Two Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 1 0 1 0 0 0 ARG1 X X X X X X X RFAGCDIS ARG2 X X X ARG Bit LNA_GAIN_INDEX[4:0] Name Function This bit selects whether the RF AGC is disabled or not 1 0 RFAGCDIS 0 = RF AGC is enabled 1 = RF AGC is disabled These bits set the value of the LNA GAIN index 2 4:0 LNA_GAIN_INDEX 0 = Minimum attenuation (max gain) 1 – 25 = Intermediate attenuation 26 = Maximum attenuation (min gain) Note: the max index is subject to change Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT RDSINT X STCINT Rev. 0.7 81 AN332 Command 0x80. GPIO_CTL Enables output for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output (Hi-Z or active drive) by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit. The state (high or low) of GPO1, 2, and 3 is set with the GPIO_SET command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is all GPO pins set for high impedance. Notes: 1. GPIO_CTL is fully supported in FMRX component 2.0 or later. Only bit GPO3OEN is supported in FMRX component 1.0. 2. The use of GPO2 as an interrupt pin and/or the use of GPO3 as DCLK digital clock input will override this GPIO_CTL function for GPO2 and/or GPO3 respectively. Available in: All except Si4710-A10 Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 0 ARG1 0 0 0 0 ARG Bit Name 1 7:4 Reserved GPO3OEN GPO2OEN GPO1OEN 0 Function Always write 0. GPO3 Output Enable. 1 3 GPO3OEN 1 2 GPO2OEN 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO2 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO1 Output Enable. 1 1 GPO1OEN 1 0 Reserved 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. Always write 0. Response 82 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 Command 0x81. GPIO_SET Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is all GPO pins set for high impedance. Note: GPIO_SET is fully-supported in FMRX component 2.0 or later. Only bit GPO3LEVEL is supported in FMRX component 1.0. Available in: All except Si4710-A10 Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 1 ARG1 0 0 0 0 GPO3LEVEL GPO2LEVEL GPO1LEVEL 0 ARG Bit Name 1 7:4 Reserved 1 3 GPO3LEVEL Function Always write 0. GPO3 Output Level. 0 = Output low (default). 1 = Output high. GPO2 Output Level. 1 2 GPO2LEVEL 1 1 GPO1LEVEL 1 0 Reserved 0 = Output low (default). 1 = Output high. GPO1 Output Level. 0 = Output low (default). 1 = Output high. Always write 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 83 AN332 5.2.2. FM/RDS Receiver Properties Property 0x0001. GPO_IEN Configures the sources for the GPO2/INT interrupt pin. Valid sources are the lower 8 bits of the STATUS byte, including CTS, ERR, RSQINT, RDSINT (Si4705/21/31/35/37/39/41/43/45/85 only), and STCINT bits. The corresponding bit is set before the interrupt occurs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The CTS interrupt enable (CTSIEN) can be set with this property and the POWER_UP command. The state of the CTSIEN bit set during the POWER_UP command can be read by reading this property and modified by writing this property. This property may only be set or read when in powerup mode. Errata:RSQIEN is non-functional on FMRX component 2.0. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 0 0 0 0 D11 D10 D9 D8 D7 D6 D5 D4 RSQREP RDSREP 0 STCREP CTSIEN ERRIEN 0 D3 D2 0 RSQIEN RDSIEN D1 D0 0 STCIEN Bit Name 15:12 Reserved Always write to 0. 11 RSQREP RSQ Interrupt Repeat. 0 = No interrupt generated when RSQINT is already set (default). 1 = Interrupt generated even if RSQINT is already set. 10 RDSREP RDS Interrupt Repeat (Si4705/21/31/35/37/39/41/43/45/85-C40 Only). 0 = No interrupt generated when RDSINT is already set (default). 1 = Interrupt generated even if RDSINT is already set. 9 Reserved Always write to 0. 8 STCREP STC Interrupt Repeat. 0 = No interrupt generated when STCINT is already set (default). 1 = Interrupt generated even if STCINT is already set. 7 CTSIEN CTS Interrupt Enable. After PowerUp, this bit reflects the CTSIEN bit in ARG1 of PowerUp Command. 0 = No interrupt generated when CTS is set. 1 = Interrupt generated when CTS is set. 6 ERRIEN ERR Interrupt Enable. 0 = No interrupt generated when ERR is set (default). 1 = Interrupt generated when ERR is set. 5:4 Reserved Always write to 0. 3 RSQIEN RSQ Interrupt Enable. 0 = No interrupt generated when RSQINT is set (default). 1 = Interrupt generated when RSQINT is set. 2 RDSIEN RDS Interrupt Enable (Si4705/21/31/35/37/39/41/43/45/85-C40 Only). 0 = No interrupt generated when RDSINT is set (default). 1 = Interrupt generated when RDSINT is set. 1 Reserved 0 84 STCIEN Function Always write to 0. Seek/Tune Complete Interrupt Enable. 0 = No interrupt generated when STCINT is set (default). 1 = Interrupt generated when STCINT is set. Rev. 0.7 AN332 Property 0x0102. DIGITAL_OUTPUT_FORMAT Configures the digital audio output format. Configuration options include DCLK edge, data format, force mono, and sample precision. Available in: Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and later, Si4741/43/45, Si4784/85 Default: 0x0000 Note: DIGITAL_OUTPUT_FORMAT is supported in FM receive component 2.0 or later. Bit 15 14 13 12 11 10 9 8 7 Name 0 0 0 0 0 0 0 0 OFALL Bit Name 15:8 Reserved 7 OFALL 6:3 OMODE[3:0] 2 OMONO 1:0 OSIZE[1:0] 6 5 4 3 OMODE[3:0] 2 OMONO 1 0 OSIZE[1:0] Function Always write to 0. Digital Output DCLK Edge. 0 = use DCLK rising edge 1 = use DCLK falling edge Digital Output Mode. 0000 = I2S 0110 = Left-justified 1000 = MSB at second DCLK after DFS pulse 1100 = MSB at first DCLK after DFS pulse Digital Output Mono Mode. 0 = Use mono/stereo blend (per blend thresholds) 1 = Force mono Digital Output Audio Sample Precision. 0 = 16-bits 1 = 20-bits 2 = 24-bits 3 = 8-bits Rev. 0.7 85 AN332 Property 0x0104. DIGITAL_OUTPUT_SAMPLE_RATE Enables digital audio output and configures digital audio output sample rate in samples per second (sps). When DOSR[15:0] is 0, digital audio output is disabled. The over-sampling rate must be set in order to satisfy a minimum DCLK of 1 MHz. To enable digital audio output, program DOSR[15:0] with the sample rate in samples per second. The system controller must establish DCLK and DFS prior to enabling the digital audio output else the device will not respond and will require reset. The sample rate must be set to 0 before the DCLK/DFS is removed. FM_TUNE_FREQ command must be sent after the POWER_UP command to start the internal clocking before setting this property. Note: DIGITAL_OUPTUT_SAMPLE_RATE is supported in FM receive component 2.0 or later. Available in: Si4705/06, Si4721/31/35/37/39, Si4730/34/36/38-D60 and later, Si4741/43/45, Si4784/85 Default: 0x0000 (digital audio output disabled) Units: sps Range: 32–48 ksps, 0 to disable digital audio output Bit 15 14 13 11 10 9 8 7 6 DOSR[15:0] Name 86 12 Bit Name 15:0 DOSR[15:0] Function Digital Output Sample Rate. 32–48 ksps. 0 to disable digital audio output. Rev. 0.7 5 4 3 2 1 0 AN332 Property 0x0201. REFCLK_FREQ Sets the frequency of the REFCLK from the output of the prescaler. The REFCLK range is 31130 to 34406 Hz (32768 ±5% Hz) in 1 Hz steps, or 0 (to disable AFC). For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz REFCLK. The reference clock frequency property would then need to be set to 32500 Hz. RCLK frequencies between 31130 Hz and 40 MHz are supported, however, there are gaps in frequency coverage for prescaler values ranging from 1 to 10, or frequencies up to 311300 Hz. The following table summarizes these RCLK gaps. Prescaler Divide by 1-4095 RCLK PIN 9 31.130 kHz – 40 MHz REFCLK 31.130 kHz – 34.406 kHz Figure 2. REFCLK Prescaler Table 11. RCLK Gaps Prescaler RCLK Low (Hz) RCLK High (Hz) 1 2 3 4 5 6 7 8 9 10 31130 62260 93390 124520 155650 186780 217910 249040 280170 311300 34406 68812 103218 137624 172030 206436 240842 275248 309654 344060 The RCLK must be valid 10 ns before sending and 20 ns after completing the FM_TUNE_FREQ and FM_SEEK_START commands. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 32768 Hz. Available in: All Default: 0x8000 (32768) Units: 1 Hz Step: 1 Hz Range: 31130–34406 Bit D15 D14 D13 15:0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 REFCLKF[15:0] Name Bit D12 Name REFCLKF[15:0] Function Frequency of Reference Clock in Hz. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 ±5%), or 0 (to disable AFC). Rev. 0.7 87 AN332 Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 4095 in 1 unit steps. For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before sending and 20 ns after completing the FM_TUNE_FREQ and FM_TUNE_START commands. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1–4095 Bit D15 D14 D13 D12 Name 0 0 0 RCLK SEL D11 D10 D9 D8 Name 15:13 Reserved Always write to 0. RCLKSEL RCLKSEL. 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. 11:0 88 REFCLKP[11:0] D6 D5 D4 D3 D2 D1 D0 REFCLKP[11:0] Bit 12 D7 Function Prescaler for Reference Clock. Integer number used to divide clock frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 5%), or 0 (to disable AFC). Rev. 0.7 AN332 Property 0x1100. FM_DEEMPHASIS Sets the FM Receive de-emphasis to 50 or 75 µs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 75 µs. Available in: All except Si4749 Default: 0x0002 Bit Name D15 D14 D13 D12 0 0 Bit Name 15:2 Reserved 1:0 0 0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 0 0 0 0 0 0 0 0 0 0 D1 D0 DEEMPH[1:0] Function Always write to 0. FM De-Emphasis. 10 = 75 µs. Used in USA (default) 01 = 50 µs. Used in Europe, Australia, Japan 00 = Reserved 11 = Reserved DEEMPH[1:0] Property 0x1102. FM_CHANNEL_FILTER Selects bandwidth of channel filter applied at the demodulation stage. Default is automatic which means the device automatically selects proper channel filter. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: Si4706, Si4749, Si4704/05/30/31/34/35/84/85-D50 and later Default: 0x0001 Range: 0–4 Note: Automatic channel filter setting is not supported in FMRX component 3.0. Bit D15 D14 D13 15:0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FMCHFILT[15:0] Name Bit D12 Name Function 0 = Automatically select proper channel filter. 1 = Force wide (110 kHz) channel filter. FM_CHANNEL_FILTER 2 = Force narrow (84 kHz) channel filter. 3 = Force narrower (60 kHz) channel filter. 4 = Force narrowest (40 kHz) channel filter. Rev. 0.7 89 AN332 Property 0x1105. FM_BLEND_STEREO_THRESHOLD Sets RSSI threshold for stereo blend (Full stereo above threshold, blend below threshold). To force stereo, set this to 0. To force mono, set this to 127. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 49 dBµV. Available in: Si470x/2x, Si473x-C40 and earlier Default: 0x0031 Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 STTHRESH D6 D5 D4 D3 D2 D1 D0 STTHRESH[6:0] Function Always write to 0. FM Blend Stereo Threshold. RSSI threshold below which the audio output goes into a blend mode. Above this threshold the audio output is in full stereo. Specified in units of dBµV in 1 dB steps (0–127). Default is 49 dBµV. Property 0x1106. FM_BLEND_MONO_THRESHOLD Sets RSSI threshold for mono blend (Full mono below threshold, blend above threshold). To force stereo, set this to 0. To force mono, set this to 127. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 30 dBµV. Available in: Si470x/2x, Si473x-C40 and earlier Default: 0x001E Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 90 D6 D5 D4 D3 D2 D1 D0 MONOTHRESH[6:0] Function Always write to 0. FM Blend Mono Threshold. RSSI threshold below which the audio output goes into full mono mode. Above this MONOTHRESH threshold the audio output is in blend or full stereo. Specified in units of dBµV in 1 dB steps (0–127). Default is 30 dBµV. Rev. 0.7 AN332 Property 0x1107. FM_ANTENNA_INPUT Selects what type of antenna and what pin it is connected to. Default is 0 which means the antenna used is a headphone (long) antenna and it is connected to the FMI pin. Setting the FMTXO bit to 1 means that the antenna used is an embedded (short) antenna and it is connected to the TXO/LPI pin. Note: To assure proper tuning, the FM_TUNE_FREQ command should be issued immediately after this property is changed. Available in: Si4704/05/06/20/21 Default: 0x0000 Bit D15 D14 D13 D12 0 Name 0 0 Bit Name 15:1 Reserved 0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 0 0 FMTXO Function Always write to 0 Selects what type of antenna and which pin it is connected to: 0 FMTXO 0 = Use FMI pin for headphone (long) antenna 1 = Use TXO/LPI pin for embedded (short) antenna Property 0x1108. FM_MAX_TUNE_ERROR Sets the maximum freq error allowed before setting the AFC rail indicator (AFCRL). The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 20 kHz. Note: For FMRX components 2.0 or earlier, the default is set to 30 kHz. For best seek performance, set FM_MAX_TUNE_ERROR to 20 kHz. Available in: All Default: 0x001E (Si473x-B20 and earlier) 0x0014 (all others) Units: kHz Step: 1 Range: 0–255 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 15:8 Reserved 7:0 D7 D6 D5 D4 D3 D2 D1 D0 FMMAXTUNEERR[7:0] Function Always write to 0. FM Maximum Tuning Frequency Error. FMMAXTUNEERR Maximum tuning error allowed before setting the AFC Rail Indicator ON. Specified in units of kHz. Default is 20 kHz. Rev. 0.7 91 AN332 Property 0x1200. FM_RSQ_INT_SOURCE Configures interrupt related to Received Signal Quality metrics. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 D11 D10 D9 D8 0 0 0 Bit Name 15:8 Reserved 7 BLENDIEN 6 Reserved 5 4 3 2 1 0 92 MULTHIEN MULTLIEN 0 0 0 0 0 D7 D6 BLEND 0 IEN D5 D4 MULT HIEN MULTLIEN D3 D2 D1 SNRHIEN SNRLIEN RSSIHIEN RSSILIEN Function Always write to 0. Interrupt Source Enable: Blend. Enable blend as the source of interrupt which the threshold is set by FM_RSQ_BLEND_THRESHOLD. Always write to 0. Interrupt Source Enable: Multipath High (Si4706-C30 and later, Si474x and Si4704/05/30/31/34/35/84/85-D50 and later only). Enable Multipath high as the source of interrupt which the threshold is set by FM_RSQ_MULTIPATH_HI_THRESHOLD. Interrupt Source Enable: Multipath Low (Si4706-C30 and later, Si474x and Si4704/05/30/31/34/35/84/85-D50 and later only). Enable Multipath low as the source of interrupt which the threshold is set by FM_RSQ_MULTIPATH_LO_THRESHOLD. SNRHIEN Interrupt Source Enable: SNR High. Enable SNR high as the source of interrupt which the threshold is set by FM_RSQ_SNR_HI_THRESHOLD. SNRLIEN Interrupt Source Enable: SNR Low. Enable SNR low as the as the source of interrupt which the threshold is set by FM_RSQ_SNR_LO_THRESHOLD. RSSIHIEN Interrupt Source Enable: RSSI High. Enable RSSI high as the source of interrupt which the threshold is set by FM_RSQ_RSSI_HI_THRESHOLD. RSSILIEN Interrupt Source Enable: RSSI Low. Enable RSSI low as the source of interrupt which the threshold is set by FM_RSQ_RSSI_LO_THRESHOLD. Rev. 0.7 D0 AN332 Property 0x1201. FM_RSQ_SNR_HI_THRESHOLD Sets high threshold which triggers the RSQ interrupt if the SNR is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127dB. Available in: All Default: 0x007F Units: dB Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SNRH D6 D5 D4 D3 D2 D1 D0 SNRH[6:0] Function Always write to 0. FM RSQ SNR High Threshold. Threshold which triggers the RSQ interrupt if the SNR is above this threshold. Specified in units of dB in 1 dB steps (0–127). Default is 127 dB. Property 0x1202. FM_RSQ_SNR_LO_THRESHOLD Sets low threshold which triggers the RSQ interrupt if the SNR is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0 dB. Available in: All Default: 0x0000 Units: dB Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SNRL D6 D5 D4 D3 D2 D1 D0 SNRL[6:0] Function Always write to 0. FM RSQ SNR Low Threshold. Threshold which triggers the RSQ interrupt if the SNR is below this threshold. Specified in units of dB in 1 dB steps (0–127). Default is 0 dB. Rev. 0.7 93 AN332 Property 0x1203. FM_RSQ_RSSI_HI_THRESHOLD Sets high threshold which triggers the RSQ interrupt if the RSSI is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127 dBµV. Available in: All Default: 0x007F Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 RSSIH D6 D5 D4 D3 D2 D1 D0 RSSIH[6:0] Function Always write to 0. FM RSQ RSSI High Threshold. Threshold which triggers the RSQ interrupt if the RSSI is above this threshold. Specified in units of dBµV in 1 dB steps (0–127). Default is 127 dBµV. Property 0x1204. FM_RSQ_RSSI_LO_THRESHOLD Sets low threshold which triggers the RSQ interrupt if the RSSI is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0 dBµV. Available in: All Default: 0x0000 Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 RSSIL 94 D6 D5 D4 D3 D2 D1 D0 RSSIL[6:0] Function Always write to 0. FM RSQ RSSI Low Threshold. Threshold which triggers the RSQ interrupt if the RSSI is below this threshold. Specified in units of dBµV in 1 dB steps (0–127). Default is 0 dBµV. Rev. 0.7 AN332 Property 0x1205. FM_RSQ_MULTIPATH_HI_THRESHOLD Sets the high threshold which triggers the RSQ interrupt if the Multipath level is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in power up mode. The value may be the threshold multipath percent (0–100), or 127 to disable the feature. Available in: Si4706-C30 and later, Si474x, Si4704/05/30/31/34/35/84/85-D50 and later Default: 0x007F Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 MULTH D6 D5 D4 D3 D2 D1 D0 MULTH[6:0] Function Always write to 0. FM RSQ Multipath High Threshold. Threshold which triggers the RSQ interrupt if the Multipath is above this threshold. Default is 127. Property 0x1206. FM_RSQ_MULTIPATH_LO_THRESHOLD Sets the low threshold which triggers the RSQ interrupt if the Multipath level is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in power up mode. The default is 0. Available in: Si4706-C30 and later, Si474x, Si4704/05/30/31/34/35/84/85-D50 and later Default: 0x0000 Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 MULTL D6 D5 D4 D3 D2 D1 D0 MULTL[6:0] Function Always write to 0 FM RSQ Multipath Low Threshold. Threshold which triggers the RSQ interrupt if the Multipath is below this threshold. Default is 0. Rev. 0.7 95 AN332 Property 0x1207. FM_RSQ_BLEND_THRESHOLD Sets the blend threshold for blend interrupt when boundary is crossed. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1%. Available in: All except Si4749 Default: 0x0081 Units: % Step: 1 Range: 0–100 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 PILOT Bit Name 15:8 Reserved 7 6:0 D6 D5 D4 D3 D2 D1 D0 BLEND[6:0] Function Always write to 0. PILOT Pilot Indicator. This bit has to be set to 1 (there has to be a pilot present) in order for FM_RSQ_BLEND_THRESHOLD to trigger an interrupt. Without a pilot tone, the part is always in full mono mode and never goes into blend. BLEND FM RSQ Blend Threshold. This is a boundary cross threshold. If the blend cross from above to below, or the other way around from below to above this threshold, it will trigger an interrupt. Specified in units of % in 1% steps (0–100). Default is 1%. Property 0x1300. FM_SOFT_MUTE_RATE Sets the attack and decay rates when entering and leaving soft mute. Later values increase rates, and lower values decrease rates. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0x0040. Available in: Si4706/07/20/21/84/85-B20 and earlier, Si4704/05/3x-C40 and earlier Default: 64 Step: 1 Range: 1—255 Bit Name 96 D15 D14 D13 D12 0 0 0 0 D11 D10 D9 D8 0 0 0 0 Rev. 0.7 D7 D6 D5 D4 D3 SMRATE[7:0] D2 D1 D0 AN332 Property 0x1301. FM_SOFT_MUTE_SLOPE Configures attenuation slope during soft mute in dB attenuation per dB SNR below the soft mute SNR threshold. Soft mute attenuation is the minimum of SMSLOPE x (SMTHR – SNR) and SMATTN. The recommended SMSLOPE value is CEILING(SMATTN/SMTHR). SMATTN and SMTHR are set via the FM_SOFT_MUTE_MAX_ATTENUATION and FM_SOFT_MUTE_SNR_THRESHOLD properties. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in power up mode. The default soft mute slope property setting is 2 dB/dB in supported devices. The soft mute slope is not configurable in Si4704/05/3x-B20 devices (those with FMRX component 2.0) and is 2 dB/dB. The soft mute slope is not configurable in Si4710/20-A10 devices (those with FMRX component 1.0), and is 0 dB/dB (disabled). Available in: Si4704/05/06/3x-C40 and later, Si4740/41/42/43/44/45 Default: 0x0002 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 D7 D6 D5 D4 D3 D2 D1 D0 SMSLOPE[7:0] Property 0x1302. FM_SOFT_MUTE_MAX_ATTENUATION Sets maximum attenuation during soft mute (dB). Set to 0 to disable soft mute. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 16 dB. Available in: All except Si4749 Default: 0x0010 Units: dB Step: 1 Range: 0–31 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 Name 0 0 0 0 0 0 0 0 0 0 0 D4 D3 D2 D1 D0 SMATTN[4:0] Bit Name Function 15:5 Reserved Always write to 0. 4:0 SMATTN FM Soft Mute Maximum Attenuation. Set maximum attenuation during soft mute. If set to 0, then soft mute is disabled. Specified in units of dB in 1 dB steps (0–31). Default is 16 dB. Rev. 0.7 97 AN332 Property 0x1303. FM_SOFT_MUTE_SNR_THRESHOLD Sets SNR threshold to engage soft mute. Whenever the SNR for a tuned frequency drops below this threshold, the FM reception will go in soft mute, provided soft mute max attenuation property is non-zero. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 4 dB. Available in: All except Si4749 Default: 0x0004 Units: dB Step: 1 Range: 0–15 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:4 Reserved 3:0 SMTHR D3 D2 D1 D0 SMTHR[3:0] Function Always write to 0. FM Soft Mute SNR Threshold. Threshold which will engage soft mute if the SNR falls below this. Specified in units of dB in 1 dB steps (0–15). Default is 4 dB. Property 0x1304. FM_SOFT_MUTE_RELEASE_RATE Sets the soft mute release rate. Smaller values provide slower release and larger values provide faster release. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 8192 (approximately 8000 dB/s). Release Rate (dB/s) = RELEASE[14:0]/1.024 Available in: Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/85-D50 and later Default: 0x2000 Range: 1–32767 Bit Name 98 D15 0 D14 D13 D12 D11 D10 D9 D8 D7 D6 RELEASE[14:0] Rev. 0.7 D5 D4 D3 D2 D1 D0 AN332 Property 0x1305. FM_SOFT_MUTE_ATTACK_RATE Sets the soft mute attack rate. Smaller values provide slower attack and larger values provide faster attack. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 8192 (approximately 8000 dB/s). Attack Rate (dB/s) = ATTACK[14:0]/1.024 Available in: Si4706-C30 and later, Si4740/41/42/43/44/45, Si4704/05/30/31/34/35/84/85-D50 and later Default: 0x2000 Range: 1–32767 Bit D15 D14 D13 D12 D11 D10 D9 0 Name D8 D7 D6 D5 D4 D3 D2 D1 D0 ATTACK[14:0] 0 -2 -4 Softmute Gain (dB) -6 -8 -10 -12 -14 x = 0x1301: FM_SOFT_MUTE_SLOPE (0-63 dB/dB) y = 0x1302: FM_SOFT_MUTE_MAX_ATTENUATION (0-31 dB) z = 0x1303: FM_SOFT_MUTE_SNR_THRESHOLD (0-15 dB) -16 -18 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SNR (dB) x=2, y=16, z=4 (Default) x=4, y=16, z=4 x=2, y=4, z=4 x=2, y=16, z=13 Figure 3. Softmute Gain (dB) Rev. 0.7 99 AN332 Property 0x1400. FM_SEEK_BAND_BOTTOM Sets the bottom of the FM band for seek. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 87.5 MHz. Available in: All Default: 0x222E Units: 10 kHz Step: 50 kHz Range: 64–108 MHz Note: For FMRX components 2.0 or earlier, range is 76–108 MHz. Bit D15 D14 15:0 100 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FMSKFREQL[15:0] Name Bit D13 Name Function FM Seek Band Bottom Frequency. FMSKFREQL Selects the bottom of the FM Band during Seek. Specified in units of 10 kHz. Default is 8750 (87.5 MHz). Rev. 0.7 AN332 Property 0x1401. FM_SEEK_BAND_TOP Sets the top of the FM band for seek. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 107.9 MHz. Available in: All Default: 0x2A26 Units: 10 kHz Step: 50 kHz Range: 64–108 MHz Note: For FMRX components 2.0 or earlier, range is 76–108 MHz. Bit D15 D14 D13 D12 D11 D10 15:0 D8 D7 D6 D5 D4 D3 D2 D1 D0 FMSKFREQH[15:0] Name Bit D9 Name Function FM Seek Band Top Frequency. FMSKFREQH Selects the top of the FM Band during Seek. Specified in units of 10 kHz. Default is 10790 (107.9 MHz). Property 0x1402. FM_SEEK_FREQ_SPACING Selects frequency spacing for FM seek. There are only 3 valid values: 5, 10, and 20. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 100 kHz. Available in: All Default: 0x000A Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 Name 0 0 0 0 0 0 0 0 0 0 0 D4 D3 D2 D1 D0 SKSPACE[4:0] Bit Name Function 15:5 Reserved Always write to 0. 4:0 SKSPACE FM Seek Frequency Spacing. Selects the frequency spacing during Seek function. Specified in units of 10 kHz. There are only 3 valid values: 5 (50 kHz), 10 (100 kHz), and 20 (200 kHz). Default is 10. Rev. 0.7 101 AN332 Property 0x1403. FM_SEEK_TUNE_SNR_THRESHOLD Sets the SNR threshold for a valid FM Seek/Tune. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 3 dB. Available in: All Default: 0x0003 Units: dB Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SKSNR D6 D5 D4 D3 D2 D1 D0 SKSNR[6:0] Function Always write to 0. FM Seek/Tune SNR Threshold. SNR Threshold which determines if a valid channel has been found during Seek/Tune. Specified in units of dB in 1 dB steps (0–127). Default is 3 dB. Property 0x1404. FM_SEEK_TUNE_RSSI_THRESHOLD Sets the RSSI threshold for a valid FM Seek/Tune. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 20 dBµV. Available in: All Default: 0x0014 Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SKRSSI 102 D6 D5 D4 D3 D2 D1 D0 SKRSSI[6:0] Function Always write to 0. FM Seek/Tune Received Signal Strength Threshold. RSSI threshold which determines if a valid channel has been found during seek/tune. Specified in units of dBµV in 1 dBµV steps (0–127). Default is 20 dBµV. Rev. 0.7 AN332 Property 0x1500. RDS_INT_SOURCE Configures interrupt related to RDS. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0. Available in: Si4705/06, Si4721, Si4731/35/37/39, Si4741/43/45/49 Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 Bit Name 15:6 Reserved 0 0 0 0 0 0 0 D5 D4 D3 RDSNEWBLOCKB RDSNEWBLOCKA 0 D2 D1 D0 RDSSYNC- RDSSYNRDSRECV FOUND CLOST Function Always write to 0. 5 RDS New Block B Found (Si4706, Si474x, and Si4705/31/35/85-D50 and later RDSNEWBLOCKB only) If set, generate an interrupt when Block B data is found or subsequently changed. 4 RDSNEWBLOCKA 3 Reserved 2 RDSSYNCFOUND RDS Sync Found. If set, generate RDSINT when RDS gains synchronization. 1 RDSSYNCLOST RDS Sync Lost. If set, generate RDSINT when RDS loses synchronization. 0 RDSRECV RDS New Block A Found (Si4706,Si474x and Si4705/31/35/85-D50 and later only) If set, generate an interrupt when Block A data is found or subsequently changed Always write to 0. RDS Received. If set, generate RDSINT when RDS FIFO has at least RDS_INT_FIFO_COUNT entries. Property 0x1501. RDS_INT_FIFO_COUNT Sets the minimum number of RDS groups stored in the RDS FIFO before RDSRECV is set. The maximum value is 25 for FRMX component 2.0 or later, and 14 for FMRX component 1.0. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Default is 0. Note: RDS_INT_FIFO_COUNT is supported in FMRX component 2.0 or later. Available in: Si4705/06, Si4721, Si4731/35/37/39, Si4741/43/45/49 Default: 0x0000 Range: 0–25 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 Bit Name 7:0 RDSFIFOCNT D7 D6 D5 D4 D3 D2 D1 D0 RDSFIFOCNT[7:0] Function RDS FIFO Count. Minimum number of RDS groups stored in the RDS FIFO before RDSRECV is set. Rev. 0.7 103 AN332 Property 0x1502. RDS_CONFIG Configures RDS settings to enable RDS processing (RDSEN) and set RDS block error thresholds. When a RDS Group is received, all block errors must be less than or equal the associated block error threshold for the group to be stored in the RDS FIFO. If blocks with errors are permitted into the FIFO, the block error information can be reviewed when the group is read using the FM_RDS_STATUS command. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0x0000. Note: RDS_CONFIG is supported in FMRX component 2.0 or later. Available in: Si4705/06, Si4721, Si4731/35/37/39, Si4741/43/45/49 Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 Name BLETHA[1:0] BLETHB[1:0] BLETHC[1:0] BLETHD[1:0] Bit Name D7 D6 D5 D4 D3 0 0 0 0 0 Function BLETHA[1:0] Block Error Threshold BLOCKA. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. BLETHB[1:0] Block Error Threshold BLOCKB. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. BLETHC[1:0] Block Error Threshold BLOCKC. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. 9:8 BLETHD[1:0] Block Error Threshold BLOCKD. 0 = No errors. 1 = 1–2 bit errors detected and corrected. 2 = 3–5 bit errors detected and corrected. 3 = Uncorrectable. 0 RDSEN 15:14 13:12 11:10 104 RDS Processing Enable. 1 = RDS processing enabled. Rev. 0.7 D2 D1 0 0 D0 RDSEN AN332 Recommended Block Error Threshold options: 2,2,2,2 = No group stored if any errors are uncorrected. 3,3,3,3 = Group stored regardless of errors. 0,0,0,0 = No group stored containing corrected or uncorrected errors. 3,2,3,3 = Group stored with corrected errors on B, regardless of errors on A, C, or D. Property 0x1503. FM_RDS_CONFIDENCE Selects the confidence level requirement for each RDS block. A higher confidence requirement will result in fewer decoder errors (% of blocks with BLE 1000 kHz. For example, LO frequency is 945 kHz when tuning to 900 kHz. Note: FAST bit is supported in Si473x-C40 and later devices and Si474x devices (AMRX component 3.0 or later). ANTCAP bits are supported in AMRX component 2.0 or later (all devices except Si4730-A10). Available in: All Command arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 0 0 0 0 ARG1 0 0 0 0 0 0 0 FAST ARG2 FREQH[7:0] Rev. 0.7 135 AN332 ARG3 FREQL[7:0] ARG4 ANTCAPH[15:8] ARG5 ANTCAPL[7:0] ARG Bit Name Function 1 7:1 Reserved 1 0 FAST 2 7:0 FREQH [7:0] 3 7:0 FREQL [7:0] 4 15:8 ANTCAPH [15:8] Always write to 0. FAST Tuning. If set, executes fast and invalidated tune. The tune status will not be accurate. Tune Frequency High Byte. This byte in combination with FREQL selects the tune frequency in kHz. In AM/SW/LW mode, the valid range is from 149 to 23000 (149 kHz–23 MHz). In AM only mode the valid range is from 520 to 1710 (520–1710 kHz). Tune Frequency Low Byte. This byte in combination with FREQH selects the tune frequency in kHz. In AM/SW/LW mode, the valid range is from 149 to 23000 (149 kHz–23 MHz). In AM only mode the valid range is from 520 to 1710 (520–1710 kHz). Antenna Tuning Capacitor High Byte. This byte in combination with ANTCAPL selects the tuning capacitor value. If both bytes are set to zero, the tuning capacitor value is selected automatically. If the value is set to anything other than 0, the tuning capacitance is manually set as 95 fF x ANTCAP + 7 pF. ANTCAP manual range is 1–6143. Automatic capacitor tuning is recommended. Note: In SW mode, ANTCAPH[15:8] needs to be set to 0 and ANTCAPL[7:0] needs to be set to 1. 5 7:0 Antenna Tuning Capacitor Low Byte. This byte in combination with ANTCAPH selects the tuning capacitor value. If both ANTCAPL bytes are set to zero, the tuning capacitor value is selected automatically. If the value is set to anything other than 0, the tuning capacitance is manually set as 95 fF x ANTCAP [7:0] + 7 pF. ANTCAP manual range is 1–6143. Automatic capacitor tuning is recommended. Note: In SW mode, ANTCAPH[15:8] needs to be set to 0 and ANTCAPL[7:0] needs to be set to 1. Response 136 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT Rev. 0.7 AN332 Command 0x41. AM_SEEK_START Initiates a seek for a channel that meets the RSSI and SNR criteria for AM. Clears any pending STCINT or RSQINT interrupt status. RSQINT is only cleared by the RSQ status command when the INTACK bit is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STCINT bit if it is already set. See Figure 29, “CTS and STC Timing Model,” on page 243 and Table 50, “Command Timing Parameters for the AM Receiver,” on page 246. Note: ANTCAP bits are supported in AMRX component 2.1 or later. Available in: All Command arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 0 0 0 1 ARG1 0 0 0 0 SEEKUP WRAP 0 0 ARG2 0 0 0 0 0 0 0 0 ARG3 0 0 0 0 0 0 0 0 ARG4 ANTCAPH[15:8] ARG5 ANTCAPL[7:0] Rev. 0.7 137 AN332 ARG Bit Name 1 7:4 Reserved Always write to 0. 1 3 SEEKUP Seek Up/Down. Determines the direction of the search, either UP = 1, or DOWN = 0. 1 2 WRAP 1 1:0 Reserved Always write to 0. 2 7:0 Reserved Always write to 0. 3 7:0 Reserved Always write to 0. 4 15:8 Function Wrap/Halt. Determines whether the seek should Wrap = 1, or Halt = 0 when it hits the band limit. Antenna Tuning Capacitor High Byte. This byte in combination with ANTCAPL selects the tuning capacitor value. If both bytes are set to zero, the tuning capacitor value is selected automatiANTCAPH[15:8] cally. If the value is set to anything other than 0, the tuning capacitance is manually set as 95 fF x ANTCAP + 7 pF. ANTCAP manual range is 1–6143. Automatic capacitor tuning is recommended. Note: In SW mode, ANTCAPH[15:8] needs to be set to 0 and ANTCAPL[7:0] needs to be set to 1. 5 7:0 ANTCAPL[7:0] Antenna Tuning Capacitor Low Byte. This byte in combination with ANTCAPH selects the tuning capacitor value. If both bytes are set to zero, the tuning capacitor value is selected automatically. If the value is set to anything other than 0, the tuning capacitance is manually set as 95 fF x ANTCAP + 7 pF. ANTCAP manual range is 1–6143. Automatic capacitor tuning is recommended. Note: In SW mode, ANTCAPH[15:8] needs to be set to 0 and ANTCAPL[7:0] needs to be set to 1. Response 138 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT Rev. 0.7 AN332 Command 0x42. AM_TUNE_STATUS Returns the status of AM_TUNE_FREQ or AM_SEEK_START commands. The commands returns the current frequency, RSSI, SNR, and the antenna tuning capacitance value (0–6143). The command clears the STCINT interrupt bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note: AFCRL bit does not work properly on AMRX component 2.1 or earlier. Available in: All Command arguments: One Response bytes: Seven Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 0 0 1 0 ARG1 0 0 0 0 0 0 CANCEL INTACK ARG Bit Name Function 1 7:2 Reserved Always write to 0. 1 1 CANCEL Cancel seek. If set, aborts a seek currently in progress. 1 0 INTACK Seek/Tune Interrupt Clear. If set, clears the seek/tune complete interrupt status indicator. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT RESP1 BLTF X X X X X AFCRL VALID RESP2 READFREQH[7:0] RESP3 READFREQL[7:0] RESP4 RSSI[7:0] RESP5 SNR[7:0] RESP6 READANTCAPH [15:8] RESP7 READANTCAPL [7:0] Rev. 0.7 139 AN332 RESP Bit Name Function Band Limit. Reports if a seek hit the band limit (WRAP = 0 in AM_START_SEEK) or wrapped to the original frequency (WRAP = 1). 1 7 BLTF 1 6:2 Reserved 1 1 AFCRL AFC Rail Indicator. Set if the AFC rails. 1 0 VALID Valid Channel. Set if the channel is currently valid and would have been found during a seek. 2 7:0 READFREQH[7:0] Read Frequency High Byte. This byte in combination with READFREQL returns frequency being tuned (kHz). 3 7:0 READFREQL[7:0] Read Frequency Low Byte. This byte in combination with READFREQH returns frequency being tuned (kHz). 4 7:0 RSSI[7:0] Received Signal Strength Indicator. This byte contains the receive signal strength when tune is completed (dBµV). 5 7:0 SNR[7:0] SNR. This byte contains the SNR metric when tune is completed (dB). 6 Read Antenna Tuning Capacitor High Byte. This byte in combination with READANTCAPL returns the current antenna 7:0 READANTCAPH [15:8] tuning capacitor value. The tuning capacitance is 95 fF x READANTCAP + 7 pF. 7 Read Antenna Tuning Capacitor Low Byte. This byte in combination with READANTCAPH returns the current antenna READANTCAPL [7:0] tuning capacitor value. The tuning capacitance is 95 fF x READANTCAP + 7 pF. 140 7:0 Always returns 0. Rev. 0.7 AN332 Command 0x43. AM_RSQ_STATUS Returns status information about the received signal quality. The commands returns RSSI and SNR. It also indicates valid channel (VALID), soft mute engagement (SMUTE), and AFC rail status (AFCRL). This command can be used to check if the received signal is above the RSSI high threshold as reported by RSSIHINT, or below the RSSI low threshold as reported by RSSILINT. It can also be used to check if the signal is above the SNR high threshold as reported by SNRHINT, or below the SNR low threshold as reported by SNRLINT. The command clears the RSQINT, SNRHINT, SNRLINT, RSSIHINT, and RSSILINT interrupt bits when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note: AFCRL bit does not work properly on AMRX component 2.1 or earlier. Available in: All Command arguments: One Response bytes: Five Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 0 0 1 1 ARG1 0 0 0 0 0 0 0 INTACK ARG Bit Name 1 0 INTACK Function Interrupt Acknowledge. 0 = Interrupt status preserved. 1 = Clears RSQINT, SNRHINT, SNRLINT, RSSIHINT, RSSILINT Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT RESP1 X X X X SNRHINT SNRLINT RSSIHINT RSSIILINT RESP2 X X X X SMUTE X AFCRL VALID RESP3 X X X X X X X X RESP4 RSSI[7:0] RESP5 SNR[7:0] Rev. 0.7 141 AN332 RESP Bit Name Function 1 3 SNRHINT SNR Detect High. 0 = Received SNR has not exceeded above SNR high threshold. 1 = Received SNR has exceeded above SNR high threshold. 1 2 SNRLINT SNR Detect Low. 0 = Received SNR has not exceeded below SNR low threshold. 1 = Received SNR has exceeded below SNR low threshold. 1 1 RSSIHINT RSSI Detect High. 0 = RSSI has not exceeded above RSSI high threshold. 1 = RSSI has exceeded above RSSI high threshold. RSSI Detect Low. 0 = RSSI has not exceeded below RSSI low threshold. 1 = RSSI has exceeded below RSSI low threshold. 1 0 RSSILINT 2 3 SMUTE Soft Mute Indicator. Indicates soft mute is engaged. 2 1 AFCRL AFC Rail Indicator. Set if the AFC rails. 2 0 VALID Valid Channel. Set if the channel is currently valid and would have been found during a seek. 4 7:0 RSSI[7:0] Received Signal Strength Indicator. Contains the current receive signal strength (dBµV). 5 7:0 SNR[7:0] SNR. Contains the current SNR metric (dB). Command 0x47. AM_AGC_STATUS Returns the AM AGC setting of the device. The command returns whether the AGC is enabled or disabled and it returns the gain index. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in power up mode. Available in: All Command arguments: None Response bytes: Two Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 0 1 1 1 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT RESP1 X X X X X X X AMAGCDIS RESP2 142 AMAGCNDX[7:0] Rev. 0.7 AN332 RESP Bit Name Function 1 0 AMAGCDIS 2 7:0 AMAGCNDX AM AGC Disable This bit indicates if the AGC is enabled or disabled. 0 = AGC enabled. 1 = AGC disabled. AM AGC Index This byte reports the current AGC gain index. 0 = Minimum attenuation (max gain) 1 – 36+ATTN_BACKUP = Intermediate attenuation 37+ATTN_BACKUP = Maximum attenuation (min gain) Note: The max index is subject to change. See Property 0x3705 AM_FRONTEND_AGC_CONTROL for details on ATTN_BACKUP. Command 0x48. AM_AGC_OVERRIDE Overrides the AM AGC setting by disabling the AGC and forcing the gain index that ranges between 0 (minimum attenuation) and 37+ATTN_BACKUP (maximum attenuation). The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in power up mode. Available in: All Command arguments: Two Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 0 1 0 0 0 ARG1 0 0 0 0 0 0 0 AMAGCDIS AMAGCNDX[7:0] ARG2 ARG Bit Name Function 1 0 AMAGCDIS 2 7:0 AMAGCNDX AM AGC Disable This bit selects whether the AGC is enabled or disabled. 0 = AGC enabled. 1 = AGC disabled. AM AGC Index If AMAGCDIS = 1, this byte forces the AGC gain index. 0 = Minimum attenuation (max gain) 1 – 36+ATTN_BACKUP = Intermediate attenuation 37+ATTN_BACKUP = Maximum attenuation (min gain) *Note: The max index is subject to change. See Property 0x3705 AM_FRONTEND_AGC_CONTROL for details on ATTN_BACKUP. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT X X STCINT Rev. 0.7 143 AN332 Command 0x80. GPIO_CTL Enables output for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output (Hi-Z or active drive) by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit. The state (high or low) of GPO1, 2, and 3 is set with the GPIO_SET command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is all GPO pins set for high impedance. Notes: 1. GPIO_CTL is supported in AM_SW_LW component 2.0 or later. 2. The use of GPO2 as an interrupt pin and/or the use of GPO3 as DCLK digital clock input will override this GPIO_CTL function for GPO2 and/or GPO3 respectively. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 0 ARG1 0 0 0 0 ARG Bit Name 1 7:4 Reserved GPO3OEN GPO2OEN GPO1OEN 0 Function Always write 0. GPO3 Output Enable. 1 3 GPO3OEN 1 2 GPO2OEN 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO2 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO1 Output Enable. 1 1 GPO1OEN 1 0 Reserved 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. Always write 0. Response 144 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 AN332 Command 0x81. GPIO_SET Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is all GPO pins set for high impedance. Note: GPIO_SET is supported in AM_SW_LW component 2.0 or later. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 1 ARG1 0 0 0 0 GPO3LEVEL GPO2LEVEL GPO1LEVEL 0 ARG Bit Name 1 7:4 Reserved Function Always write 0. GPO3 Output Level. 1 3 GPO3LEVEL 1 2 GPO2LEVEL 0 = Output low (default). 1 = Output high. GPO2 Output Level. 0 = Output low (default). 1 = Output high. GPO1 Output Level. 1 1 GPO1LEVEL 1 0 Reserved 0 = Output low (default). 1 = Output high. Always write 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X RDSINT ASQINT STCINT Rev. 0.7 145 AN332 5.3.2. AM/SW/LW Receiver Properties Property 0x0001. GPO_IEN Configures the sources for the GPO2/INT interrupt pin. Valid sources are the lower 8 bits of the STATUS byte, including CTS, ERR, RSQINT, and STCINT bits. The corresponding bit is set before the interrupt occurs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The CTS interrupt enable (CTSIEN) can be set with this property and the POWER_UP command. The state of the CTSIEN bit set during the POWER_UP command can be read by reading this property and modified by writing this property. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 0 0 0 0 D11 RSQREP D10 D9 0 D8 D7 D6 0 STCREP CTSIEN ERRIEN D5 D4 0 0 D3 D2 D1 RSQIEN 0 D0 0 STCIEN Bit Name 15:12 Reserved Always write to 0. 11 RSQREP RSQ Interrupt Repeat. 0 = No interrupt generated when RSQINT is already set (default) 1 = Interrupt generated even if RSQINT is already set 10:9 Reserved Always write to 0. 8 STCREP STC Interrupt Repeat. 0 = No interrupt generated when STCINT is already set (default) 1 = Interrupt generated even if STCINT is already set 7 CTSIEN CTS Interrupt Enable. After PowerUp, this bit reflects the CTSIEN bit in ARG1 of PowerUp Command. 0 = No interrupt generated when CTS is set 1 = Interrupt generated when CTS is set 6 ERRIEN ERR Interrupt Enable. 0 = No interrupt generated when ERR is set (default) 1 = Interrupt generated when ERR is set 5:4 Reserved Always write to 0. 3 RSQIEN RSQ Interrupt Enable. 0 = No interrupt generated when RSQINT is set (default) 1 = Interrupt generated when RSQINT is set 2:1 Reserved Always write to 0. 0 STCIEN 146 Function Seek/Tune Complete Interrupt Enable. 0 = No interrupt generated when STCINT is set (default) 1 = Interrupt generated when STCINT is set Rev. 0.7 AN332 Property 0x0102. DIGITAL_OUTPUT_FORMAT Configures the digital audio output format. Configuration options include DCLK edge, data format, force mono, and sample precision. Note: DIGITAL_OUTPUT_FORMAT is supported in AM_SW_LW component 2.0 or later. Available in: Si4705/06, Si4731/35/37/39, Si4730/34/36/38-D60 and later, Si4741/43/45, Si4784/85 Default: 0x0000 Bit 15 14 13 12 11 10 9 8 7 Name 0 0 0 0 0 0 0 0 OFALL Bit Name 15:8 Reserved 7 OFALL 6:3 OMODE[3:0] 2 Reserved 1:0 OSIZE[1:0] 6 5 4 OMODE[3:0] 3 2 1 0 0 OSIZE[1:0] Function Always write to 0. Digital Output DCLK Edge. 0 = use DCLK rising edge 1 = use DCLK falling edge Digital Output Mode. 0000 = I2S 0110 = Left-justified 1000 = MSB at second DCLK after DFS pulse 1100 = MSB at first DCLK after DFS pulse Always write to 0. Digital Output Audio Sample Precision. 0 = 16-bits 1 = 20-bits 2 = 24-bits 3 = 8-bits Rev. 0.7 147 AN332 Property 0x0104. DIGITAL_OUTPUT_SAMPLE_RATE Enables digital audio output and configures digital audio output sample rate in samples per second (sps). When DOSR[15:0] is 0, digital audio output is disabled. To enable digital audio output, program DOSR[15:0] with the sample rate in samples per second. The over-sampling rate must be set in order to satisfy a minimum DCLK of 1 MHz. The system controller must establish DCLK and DFS prior to enabling the digital audio output else the device will not respond and will require reset. The sample rate must be set to 0 before DCLK/DFS is removed. AM_TUNE_FREQ command must be sent after the POWER_UP command to start the internal clocking before setting this property. Note: DIGITAL_OUTPUT_SAMPLE_RATE is supported in AM_SW_LW component 2.0 or later. Available in: Si4705/06, Si4731/35/37/39, Si4730/34/36/38-D60 and later, Si4741/43/45, Si4784/85 Default: 0x0000 (digital audio output disabled) Units: sps Range: 32–48 ksps, 0 to disable digital audio output Bit 15 14 13 11 10 9 8 7 6 DOSR[15:0] Name 148 12 Bit Name 15:0 DOSR[15:0] Function Digital Output Sample Rate. 32–48 ksps. 0 to disable digital audio output. Rev. 0.7 5 4 3 2 1 0 AN332 Property 0x0201. REFCLK_FREQ Sets the frequency of the REFCLK from the output of the prescaler. The REFCLK range is 31130 to 34406 Hz (32768 5% Hz) in 1 Hz steps, or 0 (to disable AFC). For example, an RCLK of 13MHz would require a prescaler value of 400 to divide it to 32500 Hz REFCLK. The reference clock frequency property would then need to be set to 32500 Hz. RCLK frequencies between 31130 Hz and 40 MHz are supported, however, there are gaps in frequency coverage for prescaler values ranging from 1 to 10, or frequencies up to 311300 Hz. The following table summarizes these RCLK gaps. Prescaler Divide by 1-4095 RCLK PIN 9 31.130 kHz – 40 MHz REFCLK 31.130 kHz – 34.406 kHz Figure 12. REFCLK Prescaler Table 15. RCLK Gaps Prescaler 1 2 3 4 5 6 7 8 9 10 RCLK Low (Hz) 31130 62260 93390 124520 155650 186780 217910 249040 280170 311300 RCLK High (Hz) 34406 68812 103218 137624 172030 206436 240842 275248 309654 344060 The RCLK must be valid 10 ns before and 10 ns after completing the WB_TUNE_FREQ command. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AGC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is 32768 Hz. Available in: All Default: 0x8000 (32768) Units: 1 Hz Step: 1Hz Range: 31130-34406 Bit Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 REFCLKF[15:0] Rev. 0.7 149 AN332 Bit Name Function 15:0 REFCLKF[15:0] Frequency of Reference Clock in Hz. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 5%), or 0 (to disable AFC). Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 4095 in 1 unit steps. For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before sending and 20 ns after completing the AM_TUNE_FREQ and AM_SEEK_START commands. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1–4095 Bit D15 D14 D13 D12 Name 0 0 0 RCLK SEL Bit Name 15:13 Reserved 12 RCLKSEL 11:0 RCLKP[11:0] D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RCLKP[11:0] Function Always write to 0. RCLKSEL. 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. Prescaler for Reference Clock. Integer number used to divide the RCLK frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406* Hz (32768 ±5%), or 0 (to disable AFC). *Note: For shortwave frequencies, choose a prescalar value such that you can limit the REFCLK frequency range to 31130– 32768* Hz. 150 Rev. 0.7 AN332 Property 0x3100. AM_DEEMPHASIS Sets the AM Receive de-emphasis to 50 µs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is disabled. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 D11 D10 0 0 0 0 0 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 DEEMPH 0 Bit Name 15:1 Reserved Always write to 0. DEEMPH AM De-Emphasis. 1 = 50 µs. 0 = Disabled. 0 D9 Function Property 0x3102. AM_CHANNEL_FILTER Selects the bandwidth of the AM channel filter. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 2 kHz bandwidth channel filter. Note: The 1 kHz option, 1.8 kHz option, and 100 Hz high-pass Line Noise Rejection filter are supported on Si473x-C40 and later devices and Si474x devices (AM_SW_LW component 3.0 or later). The 2.5 kHz option is supported on Si473x-C40 and later devices (AM_SW_LW component 5.0 or later). Available in: All Default: 0x0003 Bit D15 D14 D13 D12 Name 0 Bit Name 0 0 0 D11 D10 D9 D8 D7 D6 D5 D4 0 0 0 AMPLFLT 0 0 0 0 Reserved Always write to 0. 8 AMPLFLT Enables the AM Power Line Noise Rejection Filter 7:4 Reserved Always write to 0. AMCHFILT D2 D1 D0 AMCHFLT[03:0] Function 15:9 3:0 D3 AM Channel Filter. Selects the bandwidth of the AM channel filter. The following choices are available: 0 = 6 kHz Bandwidth 1 = 4 kHz Bandwidth 2 = 3 kHz Bandwidth 3 = 2 kHz Bandwidth 4 = 1 kHz Bandwidth 5 = 1.8 kHz Bandwidth 6 = 2.5 kHz Bandwidth, gradual roll off 7–15 = Reserved (Do not use) Rev. 0.7 151 AN332 Property 0x3103. AM_AUTOMATIC_VOLUME_CONTROL_MAX_GAIN Sets the maximum gain for automatic volume control. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 16 dB. Note: The maximum AVC gain is not configurable in Si473x-B20 devices (FMRX component 2.1 and earlier), and is 90.3 dB. This would be equivalent to AM_AUTOMATIC_VOLUME_CONTROL_MAX_GAIN property value 0x7800, which is the maximum value. Available in: Si473x-C40 and later, Si474x Default: 0x1543 (Si473x-C40 and later) 0x7800 (Si474x) Step: 1 Range: 0X1000 ~ 0x7800 Bit D15 Name 0 D14 D13 D12 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 AVC_MAXGAIN [14:0] Bit Name 15 Reserved 14:0 D11 Function Always write to 0. Automatic Volume Control Max Gain. Maximum gain for automatic volume control. AVC_MAXGAIN The max gain value is given by AVC_MAXGAIN = g * 340.2 where g is the desired maximum AVC gain in dB. Minimum of 12 dB is recommend when SOFTMUTE is enabled. Property 0x3104. AM_MODE_AFC_SW_PULL_IN_RANGE Sets the SW AFC pull-in or tracking range. The value PULL_IN_RANGE is relative to the tuned frequency and is specified as 1/(PPM×10–6). For example to program a pull-in range of 115 ppm, PULL_IN_RANGE = 1/(115×10–6) = 8695. The command is complete when the CTS bit (and optional interrupt) is set. Available in: Si4734/35-C40 and later, Si4742/43/44/45 Default: 0x21F7 (115 ppm) Bit D15 D14 D13 D12 D10 D9 D8 D7 D6 D5 D4 D3 SWPIR[15:0] Name Bit Name 15:0 SWPIR[15:0] 152 D11 Function SW Pull-In Range The SW pull-in range expressed relative to the tuned frequency. Rev. 0.7 D2 D1 D0 AN332 Property 0x3105. AM_MODE_AFC_SW_LOCK_IN_RANGE Sets the SW AFC lock-in or capture range. The value LOCK_IN_RANGE is relative to the tuned frequency and is specified as 1/( PPM×10–6). For example to program a lock-in range of 85 ppm, LOCK_IN_RANGE = 1/(85×10–6) = 11765. The command is complete when the CTS bit (and optional interrupt) is set. Available in: Si4734/35-C40 and later, Si4742/43/44/45 Default: 0x2DF5 (85 ppm) Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SWPIR[15:0] Name Bit Name Function 15:0 SWPIR[15:0] SW Pull-In Range The SW lock-in range expressed relative to the tuned frequency. Property 0x3200. AM_RSQ_INT_SOURCE Configures interrupt related to Received Signal Quality metrics. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 0 0 0 0 0 0 0 0 0 0 0 0 D3 SNRHIEN D2 D1 D0 SNRLIEN RSSIHIEN RSSILIEN Bit Name Function 15:4 Reserved Always write 0. 3 SNRHIEN Interrupt Source Enable: SNR High. Enable SNR high as the source of interrupt which the threshold is set by AM_RSQ_SNR_HI_THRESHOLD. 2 SNRLIEN Interrupt Source Enable: SNR Low. Enable SNR low as the as the source of interrupt which the threshold is set by AM_RSQ_SNR_LO_THRESHOLD. 1 RSSIHIEN Interrupt Source Enable: RSSI High. Enable RSSI low as the source of interrupt which the threshold is set by AM_RSQ_RSSI_HI_THRESHOLD. 0 RSSILIEN Interrupt Source Enable: RSSI Low. Enable RSSI low as the source of interrupt which the threshold is set by AM_RSQ_RSSI_LO_THRESHOLD. Rev. 0.7 153 AN332 Property 0x3201. AM_RSQ_SNR_HI_THRESHOLD Sets high threshold which triggers the RSQ interrupt if the SNR is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127 dB. Available in: All Default: 0x007F Units: dB Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SNRH 154 D6 D5 D4 D3 D2 D1 SNRH[6:0] Function Always write to 0. AM RSQ SNR High Threshold. Threshold which triggers the RSQ interrupt if the SNR goes above this threshold. Specified in units of dB in 1 dB steps (0–127). Default is 0 dB. Rev. 0.7 D0 AN332 Property 0x3202. AM_RSQ_SNR_LO_THRESHOLD Sets low threshold which triggers the RSQ interrupt if the SNR is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0 dB. Available in: All Default: 0x0000 Units: dB Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 SNRL D6 D5 D4 D3 D2 D1 D0 SNRL[6:0] Function Always write to 0. AM RSQ SNR Low Threshold. Threshold which triggers the RSQ interrupt if the SNR goes below this threshold. Specified in units of dB in 1 dB steps (0–127). Default is 0 dB. Property 0x3203. AM_RSQ_RSSI_HI_THRESHOLD Sets high threshold which triggers the RSQ interrupt if the RSSI is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127 dB. Available in: All Default: 0x007F Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 RSSIH D6 D5 D4 D3 D2 D1 D0 RSSIH[6:0] Function Always write to 0. AM RSQ RSSI High Threshold. Threshold which triggers the RSQ interrupt if the RSSI goes above this threshold. Specified in units of dBµV in 1 dB steps (0–127). Default is 0 dBµV. Rev. 0.7 155 AN332 Property 0x3204. AM_RSQ_RSSI_LO_THRESHOLD Sets low threshold which triggers the RSQ interrupt if the RSSI is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0 dB. Available in: All Default: 0x0000 Units: dBµV Step: 1 Range: 0–127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name 0 0 0 0 0 0 0 0 0 Bit Name 15:7 Reserved 6:0 RSSIL D6 D5 D4 D3 D2 D1 D0 RSSIL[6:0] Function Always write to 0. AM RSQ RSSI Low Threshold. Threshold which triggers the RSQ interrupt if the RSSI goes below this threshold. Specified in units of dBµV in 1 dB steps (0–127). Default is 0 dBµV. Property 0x3300. AM_SOFT_MUTE_RATE Sets the attack and decay rates when entering or leaving soft mute. The value specified is multiplied by 4.35 dB/s to come up with the actual attack rate. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default rate is 278 dB/s. Available in: All Default: 0x0040 Actual Rate: SMRATE x 4.35 Units: dB/s Step: 1 Range: 1–255 Bit D15 D14 15:0 156 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SMRATE[15:0] Name Bit D13 Name SMRATE Function AM Soft Mute Rate. Determines how quickly the AM goes into soft mute when soft mute is enabled. The actual rate is calculated by taking the value written to the field and multiplying it with 4.35 dB/s. The default rate is 278 dB/s (SMRATE[15:0] = 0x0040). Rev. 0.7 AN332 Property 0x3301. AM_SOFT_MUTE_SLOPE Configures attenuation slope during soft mute in dB attenuation per dB SNR below the soft mute SNR threshold. Soft mute attenuation is the minimum of SMSLOPE x (SMTHR – SNR) and SMATTN. The recommended SMSLOPE value is CEILING(SMATTN/SMTHR). SMATTN and SMTHR are set via the AM_SOFT_MUTE_MAX_ATTENUATION and AM_SOFT_MUTE_SNR_THRESHOLD properties. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default slope is 1 dB/dB for AMRX component 5.0 or later and 2 dB/dB for AMRX component 3.0 or earlier. Available in: All Default: 0x0002 (Si4730/31/34/35/36/37-B20 and earlier, Si4740/41/42/43/44/45-C10 and earlier) 0x0001 (all others) Units: dB/dB Range: 1–5 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:4 Reserved 3:0 D3 D2 D1 D0 SMSLOPE[3:0] Function Always write to 0. AM Slope Mute Attenuation Slope. SMSLOPE[3:0] Set soft mute attenuation slope in dB attenuation per dB SNR below the soft mute SNR threshold. Property 0x3302. AM_SOFT_MUTE_MAX_ATTENUATION Sets maximum attenuation during soft mute (dB). Set to 0 to disable soft mute. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default attenuation is 8 dB for AMRX component 5.0 or later and 16 dB for AMRX component 3.0 or earlier. Available in: All Default: 0x0010 (Si4730/31/34/35/36/37-B20 and earlier, Si4740/41/42/43/44/45-C10 and earlier) 0x0008 (all others) Units: dB Step: 1 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 0 0 0 0 0 0 0 Bit Name 15:6 Reserved D5 D4 D3 D2 D1 D0 SMATTN[5:0] Function Always write to 0. Rev. 0.7 157 AN332 5:0 SMATTN AM Soft Mute Max Attenuation. Maximum attenuation to apply when in soft mute. Specified in units of dB. Default maximum attenuation is 8 dB. Property 0x3303. AM_SOFT_MUTE_SNR_THRESHOLD Sets the SNR threshold to engage soft mute. Whenever the SNR for a tuned frequency drops below this threshold the AM reception will go in soft mute, provided soft mute max attenuation property is non-zero. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default SNR threshold is 8 dB for AMRX component 5.0 or later and 10 dB for AMRX component 3.0 or earlier. Available in: All Default: 0x000A (Si4730/31/34/35/36/37-B20 and earlier, Si4740/41/42/43/44/45-C10 and earlier) 0x0008 (all others) Units: dB Step: 1 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 0 0 0 0 0 0 0 Bit Name 15:6 Reserved 5:0 SMTHR D5 D4 D3 D2 D1 D0 SMTHR[5:0] Function Always write to 0. AM Soft Mute SNR Threshold. The SNR threshold for a tuned frequency below which soft mute is engaged provided the value written to the AM_SOFT_MUTE_MAX_ATTENUATION property is not zero. Default SNR threshold is 8 dB. Property 0x3304. AM_SOFT_MUTE_RELEASE_RATE Sets the soft mute release rate. Smaller values provide slower release and larger values provide faster release. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 8192 (approximately 8000 dB/s). Release Rate (dB/s) = RELEASE[14:0]/1.024 Available in: Si4740/41/42/43/44/45 Default: 0x2000 Range: 1–32767 Bit Name 158 D15 0 D14 D13 D12 D11 D10 D9 D8 D7 D6 RELEASE[14:0] Rev. 0.7 D5 D4 D3 D2 D1 D0 AN332 Property 0x3305. AM_SOFT_MUTE_ATTACK_RATE Sets the soft mute attack rate. Smaller values provide slower attack and larger values provide faster attack. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 8192 (approximately 8000 dB/s). Attack Rate (dB/s) = ATTACK[14:0]/1.024 Available in: Si4740/41/42/43/44/45 Default: 0x2000 Range: 1–32767 Bit D15 D14 D13 D12 D11 D10 D9 0 Name D8 D7 D6 D5 D4 D3 D2 D1 D0 ATTACK[14:0] 0 -2 -4 Softmute Gain (dB) -6 -8 -10 -12 -14 x = 0x3301: AM_SOFT_MUTE_SLOPE (0-63 dB/dB) y = 0x3302: AM_SOFT_MUTE_MAX_ATTENUATION (0-63 dB) z = 0x3303: AM_SOFT_MUTE_SNR_THRESHOLD (0-255 dB) -16 -18 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 SNR (dB) x=2, y=16, z=10 (Default) x=4, y=16, z=10 x=2, y=4, z=10 x=2, y=16, z=13 Figure 13. AM Softmute SNR Rev. 0.7 159 AN332 Property 0x3400. AM_SEEK_BAND_BOTTOM Sets the lower boundary for the AM band in kHz. This value is used to determine when the lower end of the AM band is reached when performing a seek. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 520 kHz (0x0208). Available in: All Default: 0x0208 Units: kHz Step: 1 kHz Valid Range: 149–23000 kHz Recommended Range:     AM in US: AM in Asia: SW: LW: Bit D15 520–1710 kHz 522–1710 kHz 2300–23000 kHz 153–279 kHz D14 15:0 160 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 AMSKFREQL[15:0] Name Bit D13 Name Function AM Seek Band Bottom. Specify the lower boundary of the AM band when performing a seek. The seek either AMSKFREQL stops at this limit or wraps based on the parameters of AM_SEEK_START command that was issued to initiate a seek. The default value for the lower boundary of the AM band is 520 kHz. Rev. 0.7 AN332 Property 0x3401. AM_SEEK_BAND_TOP Sets the upper boundary for the AM band in kHz. This value is used to determine when the higher end of the AM band is reached when performing a seek. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1710 kHz (0x06AE). Available in: All Default: 0x06AE Note: Firmware 1.0 incorrectly reports 0x06B9 (1721 kHz) as default for AM_SEEK_BAND_TOP. After POWER_UP command is complete, set AM_SEEK_BAND_TOP to 0x06AE (1710 kHz) using the SET_PROPERTY command. Units: kHz Step: 1 kHz Valid Range: 149–23000 kHz Recommended Range:     AM in US: AM in Asia: SW: LW: Bit D15 520–1710 kHz 522–1710 kHz 2300–23000 kHz 153–279 kHz D14 15:0 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 AMSKFREQH[15:0] Name Bit D13 Name Function AM Seek Band Top. Specify the higher boundary of the AM band when performing a seek. The seek either AMSKFREQH stops at this limit or wraps based on the parameters of AM_SEEK_START command that was issued to initiate a seek. The default value for the upper boundary of the AM band is 1710 kHz. Rev. 0.7 161 AN332 Property 0x3402. AM_SEEK_FREQ_SPACING Sets the frequency spacing for the AM Band when performing a seek. The frequency spacing determines how far the next tune is going to be from the currently tuned frequency. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default frequency spacing is 10 kHz. Available in: All Default: 0x000A Units: kHz Valid Values: 1 (1 kHz), 5 (5 kHz), 9 (9 kHz), and 10 (10 kHz). Recommended Value:     AM in US: AM in Asia: SW: LW: 10 (10 kHz) 9 (9 kHz) 5 (5 kHz) 9 (9 kHz) Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:4 Reserved 3:0 162 D3 D2 D1 D0 AMSKSPACE[3:0] Function Always write to 0. AM Seek Frequency Spacing. AMSKSPACE Sets the frequency spacing when performing a seek in the AM band. The default frequency spacing is 10 kHz. Rev. 0.7 AN332 Property 0x3403. AM_SEEK_TUNE_SNR_THRESHOLD Sets the SNR threshold for a valid AM Seek/Tune. If the value is zero, then SNR is not used as a valid criteria when doing a seek for AM. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default threshold is 5 dB. Available in: All Default: 0x0005 Units: dB Step: 1 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 0 0 0 0 0 0 0 Bit Name 15:6 Reserved 5:0 AMSKSNR D5 D4 D3 D2 D1 D0 AMSKSNR[5:0] Function Always write to 0. AM Seek/Tune SNR Threshold. SNR Threshold which determines if a valid channel has been found during Seek/Tune. Specified in units of dB in 1 dB steps (0–63). Default threshold is 5 dB. Property 0x3404. AM_SEEK_TUNE_RSSI_THRESHOLD Sets the RSSI threshold for a valid AM Seek/Tune. If the value is zero then RSSI is not used as a valid criteria when doing a seek for AM. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 25 dBµV. Available in: All Default: 0x0019 Units: dBµV Step: 1 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 0 0 0 0 0 0 0 Bit Name 15:6 Reserved 5:0 AMSKRSSI D5 D4 D3 D2 D1 D0 AMSKRSSI[5:0] Function Always write to 0. AM Seek/Tune Received Signal Strength Threshold. RSSI Threshold which determines if a valid channel has been found during Seek/Tune. Specified in units of dBµV in 1 dBµV steps (0–63). Default threshold is 25 dBµV. Rev. 0.7 163 AN332 Property 0x3702. AM_AGC_ATTACK_RATE Sets the AGC attack rate. Large values provide slower attack, and smaller values provide faster attack. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 4 (approximately 1400 dB/s). 5600 AGC Attack Rate (dB/s) = --------------------------------------ATTACK  7:0  Nominal "5600" is based on Silabs' AM antenna dummy and Si474xEVB reference design and may vary with source impedance and design changes. In most systems, an exact value is not important. However, to calculate for a different source impedance and/or design: 1. Drive antenna input with desired source impedance (via antenna or antenna dummy). 2. Increase RF level until AGC index changes from 19 to 20. Record last RF level with index equal 19. 3. Increase RF level until AGC index reaches 39. Record RF level with index equal 39. 4. Replace “5600” in rate equation with “(RF39 – RF19)/0.00667”. Available in: Si4740/41/42/43/44/45 Default: 0x0004 Step: 4 Range: 4–248 Notes: 1. Was property 0x4102 in FW2.C. 2. For FW2.E, attack rate may be faster than programmed depending on initial and final RF levels. Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 164 Rev. 0.7 D7 D6 D5 D4 D3 D2 ATTACK [7:0] D1 D0 AN332 Property 0x3703. AM_AGC_RELEASE_RATE Sets the AGC release rate. Larger values provide slower release, and smaller values provide faster release. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 140 (approximately 40 dB/s). 5600 AGC Release Rate (dB/s) = ----------------------------------------RELEASE[7:0] Nominal "5600" is based on Silabs' AM antenna dummy and Si474xEVB reference design and may vary with source impedance and design changes. In most systems, an exact value is not important. However, to calculate for a different source impedance and/or design: 1. Drive antenna input with desired source impedance (via antenna or antenna dummy). 2. Increase RF level until AGC index changes from 19 to 20. Record last RF level with index equal 19. 3. Increase RF level until AGC index reaches 39. Record RF level with index equal 39. 4. Replace "5600" in rate equation with "(RF39 – RF19)/0.00667". Available in: Si4740/41/42/43/44/45 Default: 0x008C Step: 4 Range:4–248 Note: Was property 0x4103 in FW2.C. Bit D15 D14 D13 D12 D11 D10 D9 D8 Name 0 0 0 0 0 0 0 0 D7 D6 D5 0 D4 D3 D2 D1 D0 RELEASE [7:0] Property 0x3705. AM_FRONTEND_AGC_CONTROL Adjusts the AM AGC for external front-end attenuator and external front-end cascode LNA. This property contains two fields: MIN_GAIN_INDEX and ATTN_BACKUP. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0x130C (MIN_AGC_INDEX=19 and ATTN_BACKUP=12). Available in: Si4740/41/42/43/44/45 Default: 0x130C Bit Name D15 D14 D13 D12 D11 D10 D9 D8 MIN_GAIN_INDEX[7:0] D7 D6 D5 D4 D3 D2 D1 D0 ATTN_BACKUP[7:0] MIN_GAIN_INDEX impacts sensitivity and U/D performance. Lower values improve sensitivity, but degrade far away blocker U/D performance. [Note: Values below 19 have minimal sensitivity improvement.] Higher values degrade sensitivity, but improve U/D. With MIN_GAIN_INDEX=19 and Si4743 EVB reference design, the Si474x provides sensitivity of 28dBuV typical and U/D exceeding 55dB on far away blockers. With MIN_GAIN_INDEX=24, the Si474x provides sensitivity of 34dBuV typical and U/D approaching 70dB on far away blockers. The recommended MIN_GAIN_INDEX optimization procedure is: 1. Determine source impedance and AM antenna dummy. Rev. 0.7 165 AN332 2. Determine sensitivity RF input and SINAD requirements. 3. Set frequency to 1000kHz. 4. With source impedance in #1 and RF input in #2, adjust MIN_GAIN_INDEX until SINAD requirements are achieved with minimum necessary margin. 5. Program this value into Si474x MIN_GAIN_INDEX as part of initialization after POWERUP command. ATTN_BACKUP insures the AGC gain indexes are monotonic and is used when the external attenuator is engaged via GPO1/AGC2. The actual attenuation achieved depends on the source impedance or AM antenna dummy. Since AGC gain implementation is subject to change, the optimum value is best determined with specific antenna and board design. The recommend ATTN_BACKUP optimization procedure is: 1. Determine source impedance and AM antenna dummy. 2. Determine maximum RF input and associated SINAD requirements. 3. Set frequency to 1710kHz. 4. With ATTN_BACKUP set to 12 (default), disable the AGC at AMAGCNDX=47 using AM_AGC_OVERRIDE command. 5. With source impedance in #1 and RF input in #2, adjust attenuator impedance until SINAD requirements are achieved with minimum necessary margin. For Si4743EVB Rev 1.3, C7 (1200pF) attenuates against passive antenna sources and R8 (1 ohm) attenuates against active (50 ohm) sources. 6. Enable the AGC using AM_AGC_OVERRIDE. 7. Sweep the RF input from 0 to 126 dBuV and then from 126 to 0 dBuV in 1 dB steps and observe the AMAGCNDX at each RF level using AM_AGC_STATUS command. 8. If AMAGCNDX is observed to oscillate at any RF level, increase ATTN_BACKUP by 1 and repeat from step 7. 9. If AMAGCNDX is observed not to oscillate at any RF level, decrease ATTN_BACKUP by one and repeat from step 7. 10. Add one to smallest ATTN_BACKUP for which no oscillations are observed and program this value into Si474x ATTN_BACKUP as part of initialization after POWERUP command. Table 16. Recommended Values for MIN_GAIN_INDEX and ATTN_BACKUP with FW2.E and later, Si4743EVB Rev 1.3 and Various AM Antenna Dummies AM Antenna Dummy 166 MIN_GAIN_INDEX ATTN_BACKUP 50 /15 pF/62 pF (Silabs) 19 12 50 /40 pF/40 pF 19 12 50MN Series 19 12 Active (50 ) 19 20 Rev. 0.7 AN332 Property 0x3900. AM_NB_DETECT_THRESHOLD Sets the threshold for detecting impulses in dB above the noise floor. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 12 dB. Available in: Si4742/43/44/45 Default: 0x000C Range: 0–90 Note: Was property 0x4105 in FW2.C. Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 NB_DETECT_THRESHOLD [15:0] Name Property 0x3901. AM_NB_INTERVAL Interval in micro-seconds that original samples are replaced by sample-hold clean samples. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 55 µs. Available in: Si4742/43/44/45 Default: 0x0037 Range: 15–110 Note: Was property 0x4106 in FW2.C. Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 NB_INTERVAL [15:0] Name Property 0x3902. AM_NB_RATE Noise blanking rate in 100 Hz units. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 64 (6400 Hz). Available in: Si4742/43/44/45 Default: 0x0040 Range: 1–64 Note: Was property 0x4107 in FW2.C. Bit Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 NB_RATE [15:0] Rev. 0.7 167 AN332 Property 0x3903. AM_NB_IIR_FILTER Sets the bandwidth of the noise floor estimator. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 300 (465 Hz). Bandwidth (Hz) = NB_IIR_FILTER[15:0] x 1.55 Available in: Si4742/43/44/45 Default: 0x012C Range: 300–1600 Note: Was property 0x4108 in FW2.C. Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 NB_IIR_FILTER [15:0] Name Property 0x3904. AM_NB_DELAY Delay in micro-seconds before applying impulse blanking to the original samples. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in POWERUP mode. The default is 172 µs. Available in: Si4742/43/44/45 Default: 0x00AC Range: 125–219 Note: Was property 0x4109 in FW2.C. Bit Name 168 D15 D14 D13 D12 D11 D10 D9 D8 D7 NB_DELAY [15:0] Rev. 0.7 D6 D5 D4 D3 D2 D1 D0 AN332 Blanker Input time AM_NB_DETECT_THRESHOLD time LPF IIR Output AM_NB_IIR_FILTER: adjusts LPF AM_NB_INTERVAL AM_NB_DELAY Blanker Output time AM_NB_RATE: sets maximum repeat rate NB is allowed to fire. Figure 14. AM Noise Blanker Property 0x4000. RX_VOLUME Sets the audio output volume. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 63. Available in: All Default: 0x003F Step: 1 Range: 0–63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name 0 0 0 0 0 0 0 0 0 0 Bit Name 15:6 Reserved 5:0 VOL D5 D4 D3 D2 D1 D0 VOL[5:0] Function Always write to 0. Output Volume. Sets the output volume level, 63 max, 0 min. Default is 63. Rev. 0.7 169 AN332 Property 0x4001. RX_HARD_MUTE Mutes the audio output. L and R audio outputs may not be muted independently. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is unmute (0x0000). Available in: All Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:2 Reserved 1 LMUTE Mutes both L and R Audio Outputs. 0 RMUTE Mutes both L and R Audio Outputs. 170 Function Always write to 0. Rev. 0.7 D1 D0 LMUTE RMUTE AN332 5.4. Commands and Properties for the WB Receiver (Si4707/36/37/38/39/42/43) The following two tables are the summary of the commands and properties for the Weather Band Receiver component applicable to Si4707/36/37/38/39/42/43. Table 17. WB Receiver Command Summary Cmd Name 0x01 POWER_UP 0x10 GET_REV 0x11 Description Available In Power up device and mode selection. All Returns revision information on the device. All POWER_DOWN Power down device. All 0x12 SET_PROPERTY Sets the value of a property. All 0x13 GET_PROPERTY Retrieves a property’s value. All 0x14 GET_INT_STATUS Reads interrupt status bits. All 0x15 PATCH_ARGS* Reserved command used for patch file downloads. All 0x16 PATCH_DATA* Reserved command used for patch file downloads. All 0x50 WB_TUNE_FREQ Selects the WB tuning frequency. All 0x52 WB_TUNE_STATUS Queries the status of previous WB_TUNE_FREQ or WB_SEEK_START command. All 0x53 WB_RSQ_STATUS Queries the status of the Received Signal Quality (RSQ) of the current channel All 0x54 WB_SAME_STATUS 0x55 WB_ASQ_STATUS Queries the status of the 1050 kHz alert tone in Weather Band. All 0x57 WB_AGC_STATUS Queries the current AGC settings All 0x58 WB_AGC_OVERRIDE Override AGC setting by disabling and forcing it to a fixed value All 0x80 GPIO_CTL Configures GPO1, 2, and 3 as output or Hi-Z All 0x81 GPIO_SET Sets GPO1, 2, and 3 output level (low or high) All Retrieves Specific Area Message Encoding (SAME) information and acknowledges SAMEINT interrupts. Si4707 *Note: Commands PATCH_ARGS and PATCH_DATA are only used to patch firmware. For information on applying a patch file, see "7.2. Powerup from a Component Patch" on page 233. Rev. 0.7 171 AN332 Table 18. WB Receive Property Summary Prop Name 0x0001 GPO_IEN 0x0102 0x0104 Default Available In Enables interrupt sources. 0x0000 All DIGITAL_OUTPUT_ FORMAT Configure digital audio outputs. 0x0000 Si4737/39/43 DIGITAL_OUTPUT_ SAMPLE_RATE Configure digital audio output sample rate. 0x0000 Si4737/39/43 0x0201 REFCLK_FREQ Sets frequency of reference clock in Hz. The range is 31130 to 34406 Hz, or 0 to disable the AFC. Default is 32768 Hz. 0x8000 All 0x0202 REFCLK_PRESCALE Sets the prescaler value for RCLK input. 0x0001 All 0x5108 WB_MAX_TUNE_ERROR Sets the maximum freq error allowed before setting the AFC_RAIL indicator. Default value is 10 kHz. 0x000A All 0x5200 WB_RSQ_INT_SOURCE Configures interrupt related to Received Signal Quality metrics. 0x0000 All 0x5201 WB_RSQ_SNR_HI_THRESHOLD Sets high threshold for SNR interrupt. 0x007F All 0x5202 WB_RSQ_SNR_LO_THRESHOLD Sets low threshold for SNR interrupt. 0x0000 All 0x5203 WB_RSQ_RSSI_HI_THRESHOLD Sets high threshold for RSSI interrupt. 0x007F All 0x5204 WB_RSQ_RSSI_LO_THRESHOLD Sets low threshold for RSSI interrupt. 0x0000 All 0x5403 WB_VALID_SNR_THRESHOLD Sets SNR threshold to indicate a valid channel 0x0003 All 0x5404 WB_VALID_RSSI_THRESHOLD Sets RSSI threshold to indicate a valid channel 0x0014 All 0x5500 WB_SAME_INTERRUPT_SOURCE Configures SAME interrupt sources. 0x0000 Si4707 0x5600 WB_ASQ_INT_SOURCE Configures interrupt related to the 1050 kHz alert tone 0x0000 All 0x4000 RX_VOLUME Sets the output volume. 0x003F All 0x4001 RX_HARD_MUTE Mutes the audio output. L and R audio outputs may not be muted independently. 0x0000 All 172 Description Rev. 0.7 AN332 Table 19. Status Response for the WB Receiver Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT Bit Name Function Clear to Send. 7 CTS 6 ERR 5:4 Reserved 0 = Wait before sending next command. 1 = Clear to send next command. Error. 0 = No error 1 = Error Values may vary. Received Signal Quality Interrupt. 3 RSQINT 2 SAMEINT 0 = Received Signal Quality measurement has not been triggered. 1 = Received Signal Quality measurement has been triggered. SAME Interrupt (Si4707 Only). 0 = SAME interrupt has not been triggered. 1 = SAME interrupt has been triggered. Audio Signal Quality Interrupt. 1 ASQINT 0 STCINT 0 = Audio Signal Quality measurement has not been triggered. 1 = Audio Signal Quality measurement has been triggered. Seek/Tune Complete Interrupt. 0 = Tune complete has not been triggered. 1 = Tune complete interrupt has been triggered. Rev. 0.7 173 AN332 5.4.1. WB Receiver Commands Command 0x01. POWER_UP Initiates the boot process to move the device from powerdown to powerup mode. The boot can occur from internal device memory or a system controller downloaded patch. To confirm that the patch is compatible with the internal device library revision, the library revision should be confirmed by issuing the POWER_UP command with FUNC = 15 (query library ID). The device returns the response, including the library revision, and then moves into powerdown mode. The device can then be placed in powerup mode by issuing the POWER_UP command with FUNC = 3 (WB Receive) and the patch may be applied. The POWER_UP command configures the state of ROUT (pin 13), LOUT (pin 14) for analog audio mode. For Si4743 component 2A or higher, the POWER_UP command also configures the state of GPO3/DCLK (pin 19), DFS (pin 18), and DOUT (pin 17) for digital audio mode. The command configures GPO2/INT~ interrupts (GPO2OEN) and CTS interrupts (CTSIEN). If both are enabled, GPO2/IRQ is driven high during normal operation and low for a minimum of 1 μs during the interrupt. The CTSIEN bit is duplicated in the GPO_IEN property. The command is complete when the CTS bit (and optional interrupt) is set. To change function (e.g., WB RX to FM RX), issue POWER_DOWN command to stop current function; then, issue POWER_UP to start new function. Available in: All Command Arguments: Two Response Bytes: None (FUNC=3), Seven (FUNC=15) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 0 0 0 0 1 ARG1 CTSIEN GPO2OEN PATCH XOSCEN ARG2 174 OPMODE[7:0] Rev. 0.7 FUNC[3:0] AN332 Arg Bit Name Function 1 7 CTSIEN CTS Interrupt Enable. 0 = CTS interrupt disabled. 1 = CTS interrupt enabled. 1 6 GPO2OEN GPO2 Output Enable. 0 = GPO2 output disabled. 1 = GPO2 output enabled. 1 5 PATCH 1 4 XOSCEN Patch Enable. 0 = Boot normally 1 = Copy NVM to RAM, but do not boot. After CTS has been set, RAM may be patched Crystal Oscillator Enable. 0 = Use external RCLK (crystal oscillator disabled) 1 = Use crystal oscillator (RCLK and GPO3/DCLK with external 32.768kHz crystal and OPMODE = 00000101) See Si47xx Data Sheet Application Schematic for external BOM details. 1 3:0 FUNC[3:0] Function. 3 = WB Receive. 0–2, 4–14 = Reserved 15 = Query Library ID. 2 7:0 OPMODE[7:0] Application Setting 00000101 = Analog audio outputs (LOUT/ROUT) 00001011 = Digital audio output (DCLK, LOUT/DFS, ROUT/DIO) 10110000 = Digital audio outputs (DCLK, DFS, DIO) (Si4743 component 2.A or higher with XOSCEN = 0) 10110101 = Analog and digital outputs (LOUT/ROUT and DCLK, DFS, DIO) (Si4743 component 2.A or higher with XOSCEN = 0) Rev. 0.7 175 AN332 Response (FUNC = 3, WB Receive) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT Response (FUNC = 15, Query Library ID) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 RESERVED[7:0] RESP5 RESERVED[7:0] RESP6 CHIPREV[7:0] RESP7 LIBRARYID[7:0] RESP Bit Name 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision (ASCII). 3 7:0 FWMINOR[7:0] Firmware Minor Revision (ASCII). 4 7:0 RESERVED[7:0] Reserved, various values. 5 7:0 RESERVED[7:0] Reserved, various values. 6 7:0 CHIPREV[7:0] Chip Revision (ASCII). 7 7:0 LIBRARYID[7:0] Library Revision (HEX). 176 Function Final 2 digits of part number (HEX). Rev. 0.7 AN332 Command 0x10. GET_REV Returns the part number, chip revision, firmware revision, patch revision and component revision numbers. The command is complete when the CTS bit (and optional interrupt) is set. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: Eight Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 PATCHH[7:0] RESP5 PATCHL[7:0] RESP6 CMPMAJOR[7:0] RESP7 CMPMINOR[7:0] RESP8 CHIPREV[7:0] RESP Bit Name Function 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision 3 7:0 FWMINOR[7:0] Firmware Minor Revision 4 7:0 PATCHH[7:0] Patch ID High Byte 5 7:0 PATCHL[7:0] Patch ID Low Byte 6 7:0 CMPMAJOR[7:0] Component Major Revision 7 7:0 CMPMINOR[7:0] Component Minor Revision 8 7:0 CHIPREV[7:0] Final 2 digits of Part Number Chip Revision Rev. 0.7 177 AN332 Command 0x11. POWER_DOWN Moves the device form powerup to powerdown mode. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note that only the POWER_UP command is accepted in powerdown mode. If the system controller writes a command other than POWER_UP when in powerdown mode, the device does not respond. The device will only respond when a POWER_UP command is written. Note: The following describes the state of all the pins when in powerdown mode: GPIO1, GPIO2, and GPIO3 = 0 ROUT, LOUT, DOUT, DFS = Hiz. Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 1 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT Command 0x12. SET_PROPERTY Sets a property shown in Table 18, “WB Receive Property Summary,” on page 172. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command Arguments: Five Response bytes: None Command 178 Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG4 PROPVH[7:0] ARG5 PROPVL[7:0] Rev. 0.7 AN332 Arg Bit Name Function 1 7:0 Reserved 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to modify. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to modify. 4 7:0 PROPVH[7:0] Property Value High Byte. This byte in combination with PROPVL is used to set the property value. 5 7:0 PROPVL[7:0] Property Value Low Byte. This byte in combination with PROPVH is used to set the property value. Always write to 0. Command 0x13. GET_PROPERTY Gets a property as shown in Table 18, “WB Receive Property Summary,” on page 172. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: Three Response bytes: Three Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPGH[7:0] ARG3 PROPGL[7:0] Arg Bit Name Function 1 7:0 Reserved 2 7:0 PROPGH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to get. 3 7:0 PROPGL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to get. Always write to 0. Rev. 0.7 179 AN332 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 0 0 0 0 0 0 0 0 RESP2 PROPVH[7:0] RESP3 PROPVL[7:0] RESP Bit Name 1 7:0 Reserved 2 7:0 PROPVH[7:0] Function Always returns 0. Property Value High Byte. This byte in combination with PROPVL will represent the requested property value. 3 PROPVL[7:0] 7:0 Property Value High Byte. This byte in combination with PROPVH will represent the requested property value. Command 0x14. GET_INT_STATUS Updates bits 6:0 of the status byte. This command should be called after any command that sets the STCINT, RSQINT, SAMEINT (Si4707 only), or ASQINT bits. When polling this command should be periodically called to monitor the status byte, and when using interrupts, this command should be called after the interrupt is set to updated the status byte. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: One Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 1 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT 180 Rev. 0.7 AN332 Command 0x50. WB_TUNE_FREQ Sets the WB Receive to tune the frequency between 162.4 MHz and 162.55 MHz in 2.5 kHz units. For example 162.4 MHz = 64960 and 162.55 MHz = 65020. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in powerup mode. The command clears the STC bit if it is already set. Available in: All Command arguments: Three Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 0 0 0 ARG1 0 0 0 0 0 0 0 0 ARG2 FREQH[7:0] ARG3 FREQL[7:0] Arg Bit Name 1 7:0 Reserved 2 7:0 FREQH[7:0] Function Always write to 0. Tune Frequency High Byte. This byte in combination with FREQL selects the tune frequency in kHz. In WB mode the valid range is from 64960 to 65020 (162.4–162.55 MHz). 3 7:0 FREQL[7:0] Tune Frequency Low Byte. This byte in combination with FREQH selects the tune frequency in kHz. In WB mode the valid range is from 64960 to 65020 (162.4–162.55 MHz). Rev. 0.7 181 AN332 Command 0x52. WB_TUNE_STATUS Returns the status of WB_TUNE_FREQ. The commands returns the current frequency, and RSSI/SNR at the moment of tune. The command clears the STCINT interrupt bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Five Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 INTACK Arg Bit Name Function 1 7:1 Reserved 1 0 INTACK Always write to 0. Seek/Tune Interrupt Clear. If set this bit clears the seek/tune complete interrupt status indicator. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 X X X X X X AFCRL VALID RESP2 READFREQH[7:0] RESP3 READFREQL[7:0] RESP4 RSSI[7:0] RESP5 SNR[7:0] 182 Rev. 0.7 AN332 Data Bit Name Function 1 7:2 Reserved 1 1 AFCRL 1 0 VALID 2 7:0 READFREQH[7:0] 3 7:0 READFREQL[7:0] 4 7:0 RSSI[7:0] 5 7:0 SNR[7:0] Always returns 0. AFC Rail Indicator. This bit will be set if the AFC rails. Valid Channel. Confirms if the tuned channel is currently valid. Read Frequency High Byte. This byte in combination with READFREQL returns frequency being tuned. Read Frequency Low Byte. This byte in combination with READFREQH returns frequency being tuned. Received Signal Strength Indicator. This byte will contain the receive signal strength at the tuned frequency. SNR. This byte will contain the SNR metric at the tuned frequency. Command 0x53. WB_RSQ_STATUS Returns status information about the received signal quality. The commands returns the RSSI, SNR, and frequency offset. It also indicates whether the frequency is a currently valid frequency as indicated by VALID, and whether the AFC is railed or not as indicated by AFCRL. This command can be used to check if the received signal is above the RSSI high threshold as reported by RSSIHINT, or below the RSSI low threshold as reported by RSSILINT. It can also be used to check if the received signal is above the SNR high threshold as reported by SNRHINT, or below the SNR low threshold as reported by SNRLINT. The command clears the STCINT interrupt bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Seven Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 INTACK Arg Bit Name 1 0 INTACK Function Interrupt Acknowledge 0 = Interrupt status preserved. 1 = Clears RSQINT, SNRHINT, SNRLINT, RSSIHINT, RSSILINT Rev. 0.7 183 AN332 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 X X X X SNRHI NT SNRLINT RSSIHI NT RSSIILINT RESP2 X X X X X X AFCRL VALID RESP3 X X X X X X X X X X X RESP4 RSSI[7:0] RESP5 ASNR[7:0] X RESP6 X X X X FREQOFF[7:0] RESP7 Data Bit Name Function 1 3 SNRHINT SNR Detect High. 0 = Received SNR has not exceeded above SNR high threshold. 1 = Received SNR has exceeded above SNR high threshold. 1 2 SNRLINT SNR Detect Low. 0 = Received SNR has not exceeded below SNR low threshold. 1 = Received SNR has exceeded below SNR low threshold. 1 1 RSSIHINT RSSI Detect High. 0 = RSSI has not exceeded above RSSI high threshold. 1 = RSSI has exceeded above RSSI high threshold. 1 0 RSSILINT RSSI Detect Low. 0 = RSSI has not exceeded below RSSI low threshold. 1 = RSSI has exceeded below RSSI low threshold. 2 1 AFCRL AFC Rail Indicator. This bit will be set if the AFC rails. 2 0 VALID Valid Channel. Confirms if the channel is currently valid. 184 4 7:0 RSSI[7:0] Received Signal Strength Indicator. This byte will contain the receive signal strength at the tuned frequency. 5 7:0 SNR[7:0] SNR. This byte will contain the SNR metric at the tuned frequency. 7 7:0 FREQOFF[7:0] Frequency Offset. Signed frequency offset in kHz. Rev. 0.7 AN332 Command 0x54. WB_SAME_STATUS Retrieves SAME information, acknowledges SAMEINT interrupts and clears the message buffer. The command indicates whether the start of message, end of message or preamble is detected and if the header buffer is ready. The state of the decoder, message length, and 8 bytes of the message buffer with corresponding confidence level is returned. The byte at address 0 will be the first byte following the header block identifier "ZCZC", typically "-" (Dash). Each byte has an associated confidence metric ranging from 0 (low confidence) to 3 (high confidence). Available in: Si4707 Command Arguments: Two Response Bytes: Thirteen Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 1 0 0 ARG1 0 0 0 0 0 0 CLRBUF INTACK READADDR[7:0] ARG2 Arg Bit Name 1 7:2 Reserved Function Always write to 0. Clear Buffer 1 1 CLRBUF 0 = Message Buffer preserved. 1 = Clears the contents of the SAME Message Buffer. Clears the contents of the SAME Message Buffer if set. The buffer will always be cleared during WB_TUNE_FREQ. If the buffer is not cleared then each message received will be combined with the previously received message to increase the certainty of the message content. After receipt of an End-of-Message, this buffer must be cleared by the user. To prevent different headers from being combined into an incorrect message, the user must clear the buffer before a new header is transmitted. As there is no indication that a new header is about to be transmitted, the user must rely on other events to indicate when to clear the buffer. The buffer should be cleared after receipt of three headers, after the end-of-message marker, when the 1050 Hz alert tone has been detected or 6 seconds after the reception of the last header was completed and no new preamble has been detected. Once the buffer has been cleared, it will remain empty until the next start-of-message is received. Alternatively, the user may clear the buffer after each header is received and rely on a traditional best 2-of-3 voting method. In this case, no message combining is performed. Interrupt Acknowledge 1 0 INTACK 2 [7:0] READADDR[7:0] 0 = Interrupt status preserved. 1 = Clears SAMEINT. Byte in the message buffer to start reading from. Note that 8 bytes will always be returned, however the WB_SAME_STATUS:MSGLEN will report the total length of the message and the user must disregard bytes past this length. Rev. 0.7 185 AN332 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 X X X X EOMDET SOMDET PREDET HDRRDY RESP2 STATE[7:0] RESP3 MSGLEN[7:0] RESP4 CONF7[1:0] CONF6[1:0] CONF5[1:0] CONF4[1:0] RESP5 CONF3[1:0] CONF2[1:0] CONF1[1:0] CONF0[1:0] RESP6 DATA0[7:0] RESP7 DATA1[7:0] RESP8 DATA2[7:0] RESP9 DATA3[7:0] RESP10 DATA4[7:0] RESP11 DATA5[7:0] RESP12 DATA6[7:0] RESP13 DATA7[7:0] RESP Bit Name 1 3 EOMDET 1 2 SOMDET 1 1 PREDET 1 0 HDRRDY Function End Of Message Detected 1 = End of message is detected. Start Of Message Detected 1 = start of message is detected. Preamble Detected 1 = Preamble is detected. Header Buffer Ready 1 = Header buffer is ready. State Machine Status 2 [7:0] STATE[7:0] 0 = End of message. 1 = Preamble detected. 2 = Receiving SAME header message. 3 = SAME header message complete. SAME Message Length 3 186 [7:0] MSGLEN[7:0] SAME Message length in bytes. This length excludes the preamble and the header code block identifier "ZCZC". If message combining is used, the value reported is the length of the longest message received. Rev. 0.7 AN332 RESP Bit Name Function 4 [7:6] CONF7[1:0] Confidence Metric for DATA7 represented as a number between 0 (low) and 3 (high). 4 [5:4] CONF6[1:0] Confidence Metric for DATA6 represented as a number between 0 (low) and 3 (high). 4 [3:2] CONF5[1:0] Confidence Metric for DATA5 represented as a number between 0 (low) and 3 (high). 4 [1:0] CONF4[1:0] Confidence Metric for DATA4 represented as a number between 0 (low) and 3 (high). 5 [7:6] CONF3[1:0] Confidence Metric for DATA3 represented as a number between 0 (low) and 3 (high). 5 [5:4] CONF2[1:0] Confidence Metric for DATA2 represented as a number between 0 (low) and 3 (high). 5 [3:2] CONF1[1:0] Confidence Metric for DATA1 represented as a number between 0 (low) and 3 (high). 5 [1:0] CONF0[1:0] Confidence Metric for DATA0 represented as a number between 0 (low) and 3 (high). 6 [7:0] DATA0[7:0] Byte of message read at address, READADDR + 0 7 [7:0] DATA1[7:0] Byte of message read at address, READADDR + 1 8 [7:0] DATA2[7:0] Byte of message read at address, READADDR + 2 9 [7:0] DATA3[7:0] Byte of message read at address, READADDR + 3 10 [7:0] DATA4[7:0] Byte of message read at address, READADDR + 4 11 [7:0] DATA5[7:0] Byte of message read at address, READADDR + 5 12 [7:0] DATA6[7:0] Byte of message read at address, READADDR + 6 13 [7:0] DATA7[7:0] Byte of message read at address, READADDR + 7 Rev. 0.7 187 AN332 Command 0x55. WB_ASQ_STATUS Returns status information about the 1050kHz alert tone in Weather Band. The commands returns the alert on/off Interrupt and the present state of the alert tone. The command clears the ASQINT bit when INTACK bit of ARG1 is set. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Two Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 1 0 1 ARG1 0 0 0 0 0 0 0 INTACK Arg Bit Name Function 1 7:1 Reserved 1 0 INTACK Always write to 0. Interrupt Acknowledge 0 = Interrupt status preserved. 1 = Clears ASQINT, ALERTOFF_INT, ALERTON_INT Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 X X X X X X ALERTOFF_INT ALERTON_INT RESP2 X X X X X X X ALERT 188 Rev. 0.7 AN332 Data Bit Name Function 1 1 ALERTOFF_INT ALERTOFF_INT. 0 = 1050 Hz alert tone has not been detected to be absent since the last WB_TUNE_FREQ or WB_RSQ_STATUS with INTACK = 1. 1 = 1050 Hz alert tone has been detected to be absent since the last WB_TUNE_FREQ or WB_RSQ_STATUS with INTACK = 1. 1 0 ALERTON_INT ALERTON_INT. 0 = 1050 Hz alert tone has not been detected to be present since the last WB_TUNE_FREQ or WB_RSQ_STATUS with INTACK = 1. 1 = 1050 Hz alert tone has been detected to be present since the last WB_TUNE_FREQ or WB_RSQ_STATUS with INTACK = 1. 2 0 ALERT ALERT. 0 = 1050 Hz alert tone is currently not present. 1 = 1050 Hz alert tone is currently present. Command 0x57. WB_AGC_STATUS Returns the AGC setting of the device. The command returns whether the AGC is enabled or disabled. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: One Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 0 1 1 1 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT RESP1 X X X X X X X READ_RFAGCDIS RESP Bit Name Function 1 0 READ_RFAGCDIS This bit indicates whether the RF AGC is disabled or not 0 = RF AGC is enabled. 1 = RF AGC is disabled. Rev. 0.7 189 AN332 Command 0x58. WB_AGC_OVERRIDE Overrides AGC setting by disabling the AGC and forcing the LNA to have a certain gain that ranges between 0 (minimum attenuation) and 26 (maximum attenuation). This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 0 1 1 0 0 0 ARG1 X X X X X X X RFAGCDIS ARG Bit Name 1 7:1 Reserved 1 0 RFAGCDIS Function Always write to 0. This bit selects whether the RF AGC is disabled or not 0 = RF AGC is enabled. 1 = RF AGC is disabled. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT 190 Rev. 0.7 AN332 Command 0x80. GPIO_CTL Enables output for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output (Hi-Z or active drive) by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit. The state (high or low) of GPO1, 2, and 3 is set with the GPIO_SET command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is all GPO pins set for high impedance. Notes: 1. The use of GPO2 as an interrupt pin will override this GPIO_CTL function for GPO2. 2. GPO1 is not configurable as an output for Si4740/41/42/43/44/45. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 0 ARG1 0 0 0 0 ARG Bit Name 1 7:4 Reserved 1 3 GPO3OEN GPO3OEN GPO2OEN GPO1OEN 0 Function Always write 0. GPO3 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO2 Output Enable. 1 2 GPO2OEN 1 1 GPO1OEN 1 0 Reserved 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO1 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. Always write 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT Rev. 0.7 191 AN332 Command 0x81. GPIO_SET Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is all GPO pins set for high impedance. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 1 ARG1 0 0 0 0 GPO3LEVEL GPO2LEVEL GPO1LEVEL 0 ARG Bit Name 1 7:4 Reserved Function Always write 0. GPO3 Output Level. 1 3 GPO3LEVEL 1 2 GPO2LEVEL 0 = Output low (default). 1 = Output high. GPO2 Output Level. 0 = Output low (default). 1 = Output high. GPO1 Output Level. 1 1 GPO1LEVEL 1 0 Reserved 0 = Output low (default). 1 = Output high. Always write 0. Response 192 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X RSQINT SAMEINT ASQINT STCINT Rev. 0.7 AN332 5.4.2. WB Receiver Properties Property 0x0001. GPO_IEN Configures the sources for the GPO2/IRQ interrupt pin. Valid sources are the lower 8 bits of the STATUS byte, including CTS, ERR, RSQINT, SAMEINT (Si4707 only), ASQINT, and STCINT bits. The corresponding bit is set before the interrupt occurs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The CTS interrupt enable (CTSIEN) can be set with this property and the POWER_UP command. The state of the CTSIEN bit set during the POWER_UP command can be read by reading the this property and modified by writing this property. This command may only be sent when in powerup mode. Errata:RSQIEN is non-functional on WB component 2.0. Available in: All D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 SAMEREP ASQREP STCREP CTSIEN ERRIEN 0 0 RSQIEN SAMEIEN ASQIEN STCIEN Bit RSQREP Default: 0x0000 Name Bit Name Function 15:12 Reserved Always write to 0. 11 RSQREP RSQ Interrupt Repeat. 0 = No interrupt generated when RSQINT is already set (default). 1 = Interrupt generated even if RSQINT is already set. 10 SAMEREP 9 ASQREP ASQ Interrupt Repeat. 0 = No interrupt generated when ASQINT is already set (default). 1 = Interrupt generated even if ASQINT is already set. 8 STCREP STC Interrupt Repeat. 0 = No interrupt generated when STCINT is already set (default). 1 = Interrupt generated even if STCINT is already set. 7 CTSIEN CTS Interrupt Enable. After PowerUp, this bit will reflect the CTSIEN bit in ARG1 of PowerUp Command. 0 = No interrupt generated when CTS is set. 1 = Interrupt generated when CTS is set. 6 ERRIEN ERR Interrupt Enable. 0 = No interrupt generated when ERR is set (default). 1 = Interrupt generated when ERR is set. 5:4 Reserved Always write to 0. SAME Interrupt Repeat (Si4707 Only). 0 = No interrupt generated when SAMEINT is already set (default). 1 = Interrupt generated even if SAMEINT is already set. Rev. 0.7 193 AN332 Bit Name Function 3 RSQIEN 2 SAMEIEN 1 ASQIEN ASQ Interrupt Enable 0 = No interrupt generated when ASQINT is set (default) 1 = Interrupt generated when ASQINT is set 0 STCIEN Seek/Tune Complete Interrupt Enable. 0 = No interrupt generated when TCINT is set (default) 1 = Interrupt generated when TCINT is set RSQ Interrupt Enable 0 = No interrupt generated when RSQINT is set (default). 1 = Interrupt generated when RSQINT is set. SAME Interrupt Enable (Si4707 Only). 0 = No interrupt generated when SAMEINT is set (default). 1 = Interrupt generated when SAMEINT is set. Property 0x0102. DIGITAL_OUTPUT_FORMAT Configures the digital audio output format. Configuration options include DCLK edge, data format, force mono, and sample precision. Available in: Si4737/39/43 Default: 0x0000 Note: DIGITAL_OUTPUT_FORMAT is supported in WBRX component 3.0 or later. Bit 15 14 13 12 11 10 9 8 7 Name 0 0 0 0 0 0 0 0 OFALL Bit Name 15:8 Reserved 7 6:3 2 1:0 194 OFALL OMODE[3:0] OMONO OSIZE[1:0] 6 5 4 OMODE[3:0] Function Always write to 0. Digital Output DCLK Edge. 0 = use DCLK rising edge 1 = use DCLK falling edge Digital Output Mode. 0000 = I2S 0110 = Left-justified 1000 = MSB at second DCLK after DFS pulse 1100 = MSB at first DCLK after DFS pulse Digital Output Mono Mode. 0 = Use mono/stereo blend (per blend thresholds) 1 = Force mono Digital Output Audio Sample Precision. 0 = 16-bits 1 = 20-bits 2 = 24-bits 3 = 8-bits Rev. 0.7 3 2 OMONO 1 0 OSIZE[1:0] AN332 Property 0x0104. DIGITAL_OUTPUT_SAMPLE_RATE Enables digital audio output and configures digital audio output sample rate in samples per second (sps). When DOSR[15:0] is 0, digital audio output is disabled. The over-sampling rate must be set in order to satisfy a minimum DCLK of 1 MHz. To enable digital audio output, program DOSR[15:0] with the sample rate in samples per second. The system controller must establish DCLK and DFS prior to enabling the digital audio output else the device will not respond and will require reset. The sample rate must be set to 0 before the DCLK/DFS is removed. WB_TUNE_FREQ command must be sent after the POWER_UP command to start the internal clocking before setting this property. Note: DIGITAL_OUPTUT_SAMPLE_RATE is supported in WBRX component 3.0 or later. Available in: Si4737/39/43 Default: 0x0000 (digital audio output disabled) Units: sps Range: 32–48 ksps, 0 to disable digital audio output Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DOSR[15:0] Name Bit Name 15:0 DOSR[15:0] Function Digital Output Sample Rate. 32–48 ksps. 0 to disable digital audio output. Rev. 0.7 195 AN332 Property 0x0201. REFCLK_FREQ Sets the frequency of the REFCLK from the output of the prescaler. The REFCLK range is 31130 to 34406 Hz (32768 5% Hz) in 1 Hz steps, or 0 (to disable AFC). For example, an RCLK of 13MHz would require a prescaler value of 400 to divide it to 32500 Hz REFCLK. The reference clock frequency property would then need to be set to 32500 Hz. RCLK frequencies between 31130 Hz and 40 MHz are supported, however, there are gaps in frequency coverage for prescaler values ranging from 1 to 10, or frequencies up to 311300 Hz. The following table summarizes these RCLK gaps. Prescaler Divide by 1-4095 RCLK PIN 9 31.130 kHz – 40 MHz REFCLK 31.130 kHz – 34.406 kHz Figure 15. REFCLK Prescaler Table 20. RCLK Gaps Prescaler 1 2 3 4 5 6 7 8 9 10 RCLK Low (Hz) 31130 62260 93390 124520 155650 186780 217910 249040 280170 311300 RCLK High (Hz) 34406 68812 103218 137624 172030 206436 240842 275248 309654 344060 The RCLK must be valid 10 ns before and 10 ns after completing the WB_TUNE_FREQ command. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AGC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is 32768 Hz. Available in: All Default: 0x8000 (32768) Units: 1 Hz Step: 1Hz Range: 31130-34406 Bit Name 196 D15 D14 D13 D12 D11 D10 D9 D8 D7 REFCLKF[15:0] Rev. 0.7 D6 D5 D4 D3 D2 D1 D0 AN332 Bit Name Function 15:0 REFCLKF[15:0] Frequency of Reference Clock in Hz. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 5%), or 0 (to disable AFC). Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 1023 in 1 unit steps. For example, an RCLK of 13MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before and 10 ns after completing the WB_TUNE_FREQ command. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1-4095 Bit D15 D14 D13 D12 Name 0 0 0 RCLK SEL D11 D10 Bit Name 15:13 Reserved Always write to 0. 12 RCLKSEL RCLKSEL. D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 REFCLKP[11:0] Function 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. 11:0 REFCLKP[11:0] Prescaler for Reference Clock. Integer number used to divide clock frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 +/5%), or 0 (to disable AFC). Rev. 0.7 197 AN332 Property 0x5108. WB_MAX_TUNE_ERROR Sets the maximum freq error allowed before setting the AFC_RAIL indicator.The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 10 kHz. Available in: All Default: 0x000A Units: kHz Step: 1 Range: 0–15 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 WBMAXTUNEERR[15:0] Name Bit Name Function 15:0 WBMAXTUNEERR WB Maximum Tuning Frequency Error. Maximum tuning error allowed before setting the AFC Rail Indicator ON. Specified in units of kHz. Default is 10 kHz. Property 0x5200. WB_RSQ_INT_SOURCE Configures interrupt related to Received Signal Quality metrics. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0. Available in: All Default: 0x0000 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name X X X X X X X X X X X X 198 Rev. 0.7 D3 D2 D1 D0 RSSILIEN D13 RSSIHIEN D14 SNRLIEN D15 SNRHIEN Bit AN332 Bit Name 3 SNRHIEN 2 SNRLIEN 1 RSSIHIEN 0 RSSILIEN Function Interrupt Source Enable: Audio SNR High. Enable SNR high as the source of interrupt which the threshold is set by WB_RSQ_SNR_HI_THRESHOLD. Interrupt Source Enable: Audio SNR Low. Enable SNR low as the as the source of interrupt which the threshold is set by WB_RSQ_SNR_LO_THRESHOLD. Interrupt Source Enable: RSSI High. Enable RSSI high as the source of interrupt which the threshold is set by WB_RSQ_RSSI_HI_THRESHOLD. Interrupt Source Enable: RSSI Low. Enable RSSI low as the source of interrupt which the threshold is set by WB_RSQ_RSSI_LO_THRESHOLD. Property 0x5201. WB_RSQ_SNR_HI_THRESHOLD Sets high threshold which will trigger the RSQ interrupt if the Audio SNR is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127dB. Available in: All Default: 0x007F Units: dB Step: 1 Range: 0-127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SNRH[15:0] Name Bit Name Function 15:0 SNRH WB RSQ Audio SNR High Threshold. Threshold which will trigger the RSQ interrupt if the Audio SNR is above this threshold. Specified in units of dB in 1 dB steps (0…127). Default is 127dB. Rev. 0.7 199 AN332 Property 0x5202. WB_RSQ_SNR_LO_THRESHOLD Sets low threshold which will trigger the RSQ interrupt if the Audio SNR is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0dB. Available in: All Default: 0x0000 Units: dB Step: 1 Range: 0-127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SNRL[15:0] Name Bit Name Function 15:0 SNRL WB RSQ Audio SNR Low Threshold. Threshold which will trigger the RSQ interrupt if the Audio SNR is below this threshold. Specified in units of dB in 1 dB steps (0…127). Default is 0dB. Property 0x5203. WB_RSQ_RSSI_HI_THRESHOLD Sets high threshold which will trigger the RSQ interrupt if the RSSI is above this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 127dB. Available in: All Default: 0x007F Units: dBµV Step: 1 Range: 0-127 Bit D15 D14 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 RSSIH[15:0] Name Bit Name 15:0 RSSIH 200 D13 Function WB RSQ RSSI High Threshold. Threshold which will trigger the RSQ interrupt if the RSSI is above this threshold. Specified in units of dB in 1 dB steps (0…127). Default is 127dB. Rev. 0.7 D0 AN332 Property 0x5204. WB_RSQ_RSSI_LO_THRESHOLD Sets low threshold which will trigger the RSQ interrupt if the RSSI is below this threshold. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0dB. Available in: All Default: 0x0000 Units: dBµV Step: 1 Range: 0-127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RSSIL[15:0] Name Bit Name 15:0 RSSIL Function WB RSQ RSSI Low Threshold. Threshold which will trigger the RSQ interrupt if the RSSI is below this threshold. Specified in units of dB in 1 dB steps (0…127). Default is 0dB. Property 0x5403. WB_VALID_SNR_THRESHOLD Sets the SNR threshold which the WB_RSQ_STATUS and WB_TUNE_STATUS will consider the channel valid if the received SNR is at or above this value. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 3dB. Available in: All Default: 0x0003 Units: dBµV Step: 1 Range: 0-127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 WB_VALID_SNR_THRESHOLD[15:0] Name Bit Name Function 15:0 WB_VALID_S NR_THRESH OLD WB Valid SNR Threshold. SNR value at or above which WB_RSQ_STATUS and WB_TUNE_STATUS will consider the channel VALID. Specified in units of dB in 1 dB steps (0…127). Default is 3 dB. Rev. 0.7 201 AN332 Property 0x5404. WB_VALID_RSSI_THRESHOLD Sets the RSSI threshold which the WB_RSQ_STATUS and WB_TUNE_STATUS will consider the channel valid if the received RSSI is at or above this value. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 20dB. Available in: All Default: 0x0014 Units: dBµV Step: 1 Range: 0-127 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 WB_VALID_RSSI_THRESHOLD [15:0] Name Bit Name Function 15:0 WB_VALID_RSSI_ THRESHOLD WB Valid RSSI Threshold. RSSI value at or above which WB_RSQ_STATUS and WB_TUNE_STATUS will consider the channel VALID. Specified in units of dB in 1 dB steps (0…127). Default is 20 dB. Property 0x5500. WB_SAME_INTERRUPT_SOURCE Configures the SAME interrupt sources. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0. Available in: Si4707 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 0 0 0 SOMDET PREDET HDRRDY Bit EOMDET Default: 0x0000 Name Bit Name 15:4 Reserved Always write to 0. 3 EOMDET Enable EOMDET as the source of SAME Interrupt. 2 SOMDET Enable SOMDET as the source of SAME Interrupt. 1 PREDET Enable PREDET as the source of SAME Interrupt. 0 HDRRDY Enable HDRRDY as the source of SAME Interrupt. 202 Function Rev. 0.7 AN332 Property 0x5600. WB_ASQ_INT_SOURCE Configures interrupt related to the 1050kHz alert tone. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 0. Available in: All Default: 0x0000 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name X X X X X X X X X X X X X X Bit Name 1 ALERTOFF_IEN Interrupt Source Enable: Alert OFF. Enable 1050kHz alert tone disappeared as the source of interrupt. 0 ALERTON_IEN Interrupt Source Enable: Alert ON. Enable 1050kHz alert tone appeared as the source of interrupt. D1 D0 ALERTON_IEN D15 ALERTOFF_IEN Bit Function Property 0x4000. RX_VOLUME Sets the audio output volume. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 63. Available in: All Default: 0x003F Step: 1 Range: 0-63 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 VOL[15:0] Name Bit Name 15:0 VOL Function Output Volume. Sets the output volume level, 63 max, 0 min. Default is 63. Rev. 0.7 203 AN332 Property 0x4001. RX_HARD_MUTE Mutes the audio output. L and R audio outputs may not be muted independently. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is unmute (0x0000). Available in: All Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit Name 15:2 Reserved 1 LMUTE Mutes both L and R Audio Outputs. 0 RMUTE Mutes both L and R Audio Outputs. 204 Function Always write to 0. Rev. 0.7 D1 D0 LMUTE RMUTE AN332 5.5. Commands and Properties for the Stereo Audio ADC Mode (Si4704/05/30/31/34/35) The following two tables are the summary of the commands and properties for the Stereo Audio ADC component applicable to Si4704/05/30/31/34/35-D60. Table 21. Stereo Audio ADC Mode Command Summary Cmd Name Description Devices 0x01 POWER_UP Power-up device and mode selection. Modes include operational function and audio interface configuration All 0x10 GET_REV Returns the revision information on the device. All 0x11 POWER_DOWN Power-down device. All 0x12 SET_PROPERTY Sets the value of a property. All 0x13 GET_PROPERTY Retrieves a property's value. All 0x14 GET_INT_STATUS Read interrupt status bits. All 0x15 PATCH_ARGS* Reserved command used for patch file down-loads. All 0x16 PATCH_DATA* Reserved command used for patch file down-loads. All 0x61 AUX_ASRC_START Starts sampling rate conversion. All 0x65 AUX_ASQ_STATUS Reports audio signal quality metrics. All 0x80 GPIO_CNTL Configures GPO1, 2, and 3 as output or Hi-Z All 0x81 GPIO_SET Sets GPO1, 2, and 3 output level (low or high). All *Note: Commands PATCH_ARGS and PATCH_DATA are only used to patch firmware. For information on applying a patch file, see "7.2. Powerup from a Component Patch" on page 233. Table 22. Stereo Audio ADC Mode Property Summary Prop Name Description Default Available In 0x0001 GPO_IEN Enables interrupt sources. 0x0000 All 0x0102 DIGITAL_OUTPUT_ FORMAT Configure digital audio outputs. 0x0000 All 0x0104 DIGITAL_OUTPUT_ SAMPLE_RATE Configure digital audio output sample rate. 0x0000 All 0x0201 REFCLK_FREQ Sets the frequency of the reference clock in Hz. The range is 31130 to 34406 Hz. 0x8000 All 0x0202 REFCLK_PRESCALE Sets prescaler value for the reference clock. 0x0001 All 0x6600 AUX_ASQ_INTERRUPT_ SOURCE Configure ASQ Interrupt source. 0x0000 All Rev. 0.7 205 AN332 Bit D7 D6 D5 D4 D3 D2 D1 D0 Name CTS ERR X X X X ASQINT X Bit Name 7 CTS Function Clear to Send. 0 = Wait before sending next command. 1 = Clear to send next command. 6 ERR Error. 0 = No error 1 = Error 5:2 Reserved Values may vary. 1 ASQINT Audio Signal Quality Interrupt. 0 = Audio signal quality interrupt has not been triggered. 1 = Audio signal quality interrupt has been triggered. 0 206 Reserved Values may vary. Rev. 0.7 AN332 5.5.1. Stereo Audio ADC Mode Commands Command 0x01. POWER_UP Initiates the boot process to move the device from powerdown to powerup mode. The boot can occur from internal device memory or a system controller downloaded patch. To confirm that the patch is compatible with the internal device library revision, the library revision should be confirmed by issuing the POWER_UP command with FUNC = 15 (query library ID). The device returns the response, including the library revision, and then moves into powerdown mode. The device can then be placed in powerup mode by issuing the POWER_UP command with FUNC = 4 (AUX Input) and the patch may be applied (See Section "7.2. Powerup from a Component Patch" on page 233). The POWER_UP command configures the state of RIN (pin 15) and LIN (pin 16) for analog audio inputs and GPO2/INT (pin 18) for interrupt operation. POWER_UP command also configures the state of GPO3/DCLK (pin 17), DFS (pin 14), and DOUT (pin 13) for digital audio mode. The command configures GPO2/INT interrupts (GPO2OEN) and CTS interrupts (CTSIEN). If both are enabled, GPO2/INT is driven high during normal operation and low for a minimum of 1 µs during the interrupt. The CTSIEN bit is duplicated in the GPO_IEN property. The command is complete when the CTS bit (and optional interrupt) is set. Note: To change function (e.g. FM RX to AUX IN or AUX IN to AM RX), issue POWER_DOWN command to stop current function; then, issue POWER_UP to start new function. Available in: All Command Arguments: Two Response Bytes: None (FUNC = 0), Seven (FUNC = 15) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 0 0 0 0 1 ARG1 CTSIEN GPO2OEN PATCH XOSCEN OPMODE[7:0] ARG2 ARG Bit Name Function 1 7 CTSIEN CTS Interrupt Enable. 0 = CTS interrupt disabled. 1 = CTS interrupt enabled. 1 6 GPO2OEN GPO2 Output Enable. 0 = GPO2 output disabled. 1 = GPO2 output enabled. 1 5 FUNC[3:0] PATCH Patch Enable. 0 = Boot normally. 1 = Copy NVM to RAM, but do not boot. After CTS has been set, RAM may be patched. Rev. 0.7 207 AN332 ARG Bit Name Function Crystal Oscillator Enable. Note: Set to 0 for Si4740/41/42/43/44/45/49 1 4 XOSCEN 1 3:0 FUNC[3:0] 2 7:0 OPMODE[7:0] 0 = Use external RCLK (crystal oscillator disabled). 1 = Use crystal oscillator (RCLK and GPO3/DCLK with external 32.768 kHz crystal and OPMODE=00000101). See Si47xx Data Sheet Application Schematic for external BOM details. Function. 0–3 = Reserved. 4 = AUX IN. 5–14 = Reserved. Application Setting. 01011011 = Digital audio outputs (DCLK, DFS, DIO) Response (FUNC = 4, AUX IN) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X Response (FUNC = 15, Query Library ID) Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 RESERVED[7:0] RESP5 RESERVED[7:0] RESP6 CHIPREV[7:0] RESP7 LIBRARYID[7:0] RESP Bit Name 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision (ASCII). 3 7:0 FWMINOR[7:0] Firmware Minor Revision (ASCII). 4 7:0 RESERVED[7:0] Reserved, various values. 5 7:0 RESERVED[7:0] Reserved, various values. 6 7:0 CHIPREV[7:0] Chip Revision (ASCII). 7 7:0 LIBRARYID[7:0] Library Revision (HEX). 208 Function Final 2 digits of part number (HEX). Rev. 0.7 AN332 Command 0x10. GET_REV Returns the part number, chip revision, firmware revision, patch revision and component revision numbers. The command is complete when the CTS bit (and optional interrupt) is set. This command may only be sent when in powerup mode. Available in: All Command arguments: None Response bytes: Fifteen (Si4705 only), Eight (Si4704/3x) Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X RESP1 PN[7:0] RESP2 FWMAJOR[7:0] RESP3 FWMINOR[7:0] RESP4 PATCHH[7:0] RESP5 PATCHL[7:0] RESP6 CMPMAJOR[7:0] RESP7 CMPMINOR[7:0] RESP8 CHIPREV[7:0] RESP10 Reserved RESP11 Reserved RESP12 Reserved RESP13 Reserved RESP14 Reserved RESP15 CID[7:0] (Si4705 only) RESP Bit Name Function 1 7:0 PN[7:0] 2 7:0 FWMAJOR[7:0] Firmware Major Revision (ASCII). 3 7:0 FWMINOR[7:0] Firmware Minor Revision (ASCII). 4 7:0 PATCHH[7:0] Patch ID High Byte (HEX). 5 7:0 PATCHL[7:0] Patch ID Low Byte (HEX). 6 7:0 CMPMAJOR[7:0] Component Major Revision (ASCII). 7 7:0 CMPMINOR[7:0] Component Minor Revision (ASCII). 8 7:0 CHIPREV[7:0] 15 7:0 CID[7:0] Final 2 digits of Part Number (HEX). Chip Revision (ASCII). CID (Si4705 only). Rev. 0.7 209 AN332 Command 0x11. POWER_DOWN Moves the device from powerup to powerdown mode. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Note that only the POWER_UP command is accepted in powerdown mode. If the system controller writes a command other than POWER_UP when in powerdown mode, the device does not respond. The device will only respond when a POWER_UP command is written. GPO pins are powered down and not active during this state. For optimal power down current, GPO2 must be either internally driven low through GPIO_CTL command or externally driven low. Note: The following describes the state of all the pins when in powerdown mode: GPIO1, GPIO2, and GPIO3 = 0 DOUT, DFS, RIN, LIN = HiZ Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 0 1 Response 210 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X X X Rev. 0.7 AN332 Command 0x12. SET_PROPERTY Sets a property shown in Table 22, “Stereo Audio ADC Mode Property Summary,” on page 205. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. See Figure 30, “CTS and SET_PROPERTY Command Complete tCOMP Timing Model,” on page 243 and Table 52, “Command Timing Parameters for the Stereo Audio ADC Mode,” on page 247. Available in: All Command Arguments: Five Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 0 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG4 PROPDH[7:0] ARG5 PROPDL[7:0] ARG Bit Name Function 1 7:0 Reserved 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to modify. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to modify. 4 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPDL is used to set the property value. 5 7:0 PROPDL[7:0] Property Value Low Byte. This byte in combination with PROPDH is used to set the property value. Always write to 0. Rev. 0.7 211 AN332 Command 0x13. GET_PROPERTY Gets a property as shown in Table 22, “Stereo Audio ADC Mode Property Summary,” on page 205. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: Three Response bytes: Three Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 0 1 1 ARG1 0 0 0 0 0 0 0 0 ARG2 PROPH[7:0] ARG3 PROPL[7:0] ARG Bit Name Function 1 7:0 Reserved 2 7:0 PROPH[7:0] Property High Byte. This byte in combination with PROPL is used to specify the property to get. 3 7:0 PROPL[7:0] Property Low Byte. This byte in combination with PROPH is used to specify the property to get. Always write to 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X RESP1 0 0 0 0 0 0 0 0 RESP2 PROPDH[7:0] RESP3 PROPDL[7:0] RESP Bit Name 1 7:0 Reserved 2 7:0 PROPDH[7:0] Property Value High Byte. This byte in combination with PROPDL represents the requested property value. 3 7:0 PROPDL[7:0] Property Value High Byte. This byte in combination with PROPDH represents the requested property value. 212 Function Always returns 0. Rev. 0.7 AN332 Command 0x14. GET_INT_STATUS Updates bits 6:0 of the status byte. This command should be called after any command that sets the ASQINT bit. When polling this command should be periodically called to monitor the STATUS byte, and when using interrupts, this command should be called after the interrupt is set to update the STATUS byte. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be set when in powerup mode. Available in: All Command arguments: None Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 0 0 1 0 1 0 0 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X Command 0x61. AUX_ASRC_START Starts sample rate conversion in signal processing module. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt occurs if both the CTS and ERR bits are set. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 1 0 0 0 0 1 Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X Rev. 0.7 213 AN332 Command 0x65. AUX_ASQ_STATUS Returns status information about audio signal quality. The command returns the input signalLEVEL. This command can be used to detect if a signal overload condition is present indicated by OVERLOADINT. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. Available in: All Command arguments: One Response bytes: Three Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 0 1 1 0 0 1 0 1 ARG1 0 0 0 0 0 0 0 INTACK ARG Bit Name 1 0 INTACK Function Interrupt Acknowledge. 0 = Interrupt status preserved. 1 = Clears ASQINT Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X RESP1 X X X X X X X OVERLOADINT RESP2 X X X X X X X OVERLOAD LEVEL[7:0] RESP3 RESP 214 Bit Name Function Audio Signal Overload Interrupt. 0 = Audio Input Signal overload has not been detected. 1 = Audio Input Signal overload has been detected. 1 0 OVERLOADINT 2 0 OVERLOAD Audio Signal Overload. 0 = Audio Input Signal overload is not present. 1 = Audio Input Signal overload is present. 3 7:0 LEVEL[7:0] Audio Input Signal Level. Line input audio level indicator in FS. Range: –128 to 127 Rev. 0.7 AN332 Command 0x80. GPIO_CTL Enables output for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output (Hi-Z or active drive) by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit. The state (high or low) of GPO1, 2, and 3 is set with the GPIO_SET command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This command may only be sent when in powerup mode. The default is all GPO pins set for high impedance. Note: The use of GPO2 as an interrupt pin and/or the use of GPO3 as DCLK digital clock input will override this GPIO_CTL function for GPO2 and/or GPO3 respectively. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 0 ARG1 0 0 0 0 ARG Bit Name 1 7:4 Reserved 1 3 GPO3OEN GPO3OEN GPO2OEN GPO1OEN 0 Function Always write 0. GPO3 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO2 Output Enable. 1 2 GPO2OEN 1 1 GPO1OEN 1 0 Reserved 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. GPO1 Output Enable. 0 = Output Disabled (Hi-Z) (default). 1 = Output Enabled. Always write 0. Response Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X Rev. 0.7 215 AN332 Command 0x81. GPIO_SET Sets the output level (high or low) for GPO1, 2, and 3. GPO1, 2, and 3 can be configured for output by setting the GPO1OEN, GPO2OEN, and GPO3OEN bit in the GPIO_CTL command. To avoid excessive current consumption due to oscillation, GPO pins should not be left in a high impedance state. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is all GPO pins set for high impedance. Available in: All Command arguments: One Response bytes: None Command Bit D7 D6 D5 D4 D3 D2 D1 D0 CMD 1 0 0 0 0 0 0 1 ARG1 0 0 0 0 GPO3LEVEL GPO2LEVEL GPO1LEVEL 0 ARG Bit Name 1 7:4 Reserved Function Always write 0. GPO3 Output Level. 1 3 GPO3LEVEL 1 2 GPO2LEVEL 0 = Output low (default). 1 = Output high. GPO2 Output Level. 0 = Output low (default). 1 = Output high. GPO1 Output Level. 1 1 GPO1LEVEL 1 0 Reserved 0 = Output low (default). 1 = Output high. Always write 0. Response 216 Bit D7 D6 D5 D4 D3 D2 D1 D0 STATUS CTS ERR X X X X ASQINT X Rev. 0.7 AN332 5.5.2. Stereo Audio ADC Mode Properties Property 0x0001. GPO_IEN Configures the sources for the GPO2/INT interrupt pin. Valid sources are the lower 8 bits of the STATUS byte, including CTS, ERR, and ASQINT bits. The corresponding bit is set before the interrupt occurs. The CTS bit (and optional interrupt) is set when it is safe to send the next command. The CTS interrupt enable (CTSIEN) can be set with this property and the POWER_UP command. The state of the CTSIEN bit set during the POWER_UP command can be read by reading this property and modified by writing this property. This property may only be set or read when in powerup mode. Available in: All Default: 0x0000 Bit Name D15 D14 D13 D12 0 0 0 0 D11 D10 D9 D8 D7 D6 0 0 ASQIEN 0 CTSIEN ERRIEN D5 D4 D3 0 0 Bit Name 15:10 Reserved Always write to 0. 9 ASQREP ASQ Interrupt Repeat. 0 = No interrupt generated when ASQINT is already set (default). 1 = Interrupt generated even if ASQINT is already set. 8 Reserved Always write to 0. 0 D2 D1 D0 0 ASQIEN 0 Function 7 CTSIEN CTS Interrupt Enable. After PowerUp, this bit reflects the CTSIEN bit in ARG1 of PowerUp Command. 0 = No interrupt generated when CTS is set. 1 = Interrupt generated when CTS is set. 6 ERRIEN ERR Interrupt Enable. 0 = No interrupt generated when ERR is set (default). 1 = Interrupt generated when ERR is set. 5:2 Reserved Always write to 0. 1 ASQIEN ASQ Interrupt Enable. 0 = No interrupt generated when ASQINT is set (default). 1 = Interrupt generated when ASQINT is set. 0 Reserved Always write to 0. Rev. 0.7 217 AN332 Property 0x0102. DIGITAL_OUTPUT_FORMAT Configures the digital audio output format. Configuration options include DCLK edge, data format, force mono, and sample precision. Available in: All Default: 0x0000 Bit 15 14 13 12 11 10 9 8 7 Name 0 0 0 0 0 0 0 0 OFALL Bit Name 15:8 Reserved 7 6:3 2 1:0 218 OFALL OMODE[3:0] OMONO OSIZE[1:0] 6 5 4 OMODE[3:0] Function Always write to 0. Digital Output DCLK Edge. 0 = use DCLK rising edge 1 = use DCLK falling edge Digital Output Mode. 0000 = I2S 0110 = Left-justified 1000 = MSB at second DCLK after DFS pulse 1100 = MSB at first DCLK after DFS pulse Digital Output Mono Mode. 0 = Use mono/stereo blend (per blend thresholds) 1 = Force mono Digital Output Audio Sample Precision. 0 = 16-bits 1 = 20-bits 2 = 24-bits 3 = 8-bits Rev. 0.7 3 2 OMONO 1 0 OSIZE[1:0] AN332 Property 0x0104. DIGITAL_OUTPUT_SAMPLE_RATE Enables digital audio output and configures digital audio output sample rate in samples per second (sps). When DOSR[15:0] is 0, digital audio output is disabled. The over-sampling rate must be set in order to satisfy a minimum DCLK of 1 MHz. To enable digital audio output, program DOSR[15:0] with the sample rate in samples per second. The system controller must establish DCLK and DFS prior to enabling the digital audio output else the device will not respond and will require reset. The sample rate must be set to 0 before the DCLK/DFS is removed. Available in: All Default: 0x0000 (digital audio output disabled) Units: sps Range: 32–48 ksps, 0 to disable digital audio output Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DOSR[15:0] Name Bit Name 15:0 DOSR[15:0] Function Digital Output Sample Rate. 32, 44.1, and 48 ksps. 0 to disable digital audio output. Rev. 0.7 219 AN332 Property 0x0201. REFCLK_FREQ Sets the frequency of the REFCLK from the output of the prescaler. The REFCLK range is 31130 to 34406 Hz (32768 ±5% Hz) in 1 Hz steps, or 0 (to disable AFC). For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz REFCLK. The reference clock frequency property would then need to be set to 32500 Hz. RCLK frequencies between 31130 Hz and 40 MHz are supported, however, there are gaps in frequency coverage for prescaler values ranging from 1 to 10, or frequencies up to 311300 Hz. The following table summarizes these RCLK gaps. Prescaler Divide by 1-4095 RCLK PIN 9 31.130 kHz – 40 MHz REFCLK 31.130 kHz – 34.406 kHz Figure 16. REFCLK Prescaler Table 23. RCLK Gaps Prescaler RCLK Low (Hz) RCLK High (Hz) 1 2 3 4 5 6 7 8 9 10 31130 62260 93390 124520 155650 186780 217910 249040 280170 311300 34406 68812 103218 137624 172030 206436 240842 275248 309654 344060 The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 32768 Hz. The RCLK must be valid 10 ns before sending and 20 ns after completing the AUX_ASRC_START command. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times. Available in: All Default: 0x8000 (32768) Units: 1 Hz Step: 1 Hz Range: 31130–34406 Bit D15 D14 Bit 220 D13 D12 D11 D10 D9 D8 D7 D6 D5 REFCLKF[15:0] Name Name Function Rev. 0.7 D4 D3 D2 D1 D0 AN332 15:0 REFCLKF[15:0] Frequency of Reference Clock in Hz. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 ±5%), or 0 (to disable AFC). Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 4095 in 1 unit steps. For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before sending and 20 ns after completing the AUX_ASRC_START command. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times.The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1–4095 Bit D15 D14 D13 D12 Name 0 0 0 RCLKSEL D11 D10 D9 D8 Name 15:13 Reserved Always write to 0. 12 RCLKSEL 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. REFCLKP[11:0] D6 D5 D4 D3 D2 D1 D0 REFCLKP[11:0] Bit 11:0 D7 Function Prescaler for Reference Clock. Integer number used to divide clock frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 5%), or 0 (to disable AFC). Rev. 0.7 221 AN332 Property 0x6600. AUX_ASQ_INTERRUPT_SOURCE Configures interrupt related to Audio Signal Quality metrics. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in power up mode. The default is 0. Available in: All Default: 0x0000 Bit D15 D14 D13 D12 D11 D10 D8 D7 D6 D5 D4 0X0000 Name Bit Name 15:2 Reserved 1:0 OVERLOADINT 222 D9 D2 D1 D0 OVER LOADINT Function Always write to 0. Interrupt Source Enable: Overload 0 = Disable audio signal overload detection interrupt 1 = Enable audio signal overload detection interrupt Rev. 0.7 D3 AN332 6. Control Interface The bus mode is selected by sampling the state of the GPO1 and GPO2/INT pins on the rising edge of RST. The GPO1 pin includes a 1 M internal pull-up resistor that is connected while RST is low, and the GPO2/INT pin includes an internal 1 M pull-down resistor that is connected while the RST pin in low. Therefore, it is only necessary for the system controller to actively drive pins if a mode other than the default 2-wire mode is required, as shown in Table 24. After bus mode selection is complete, the device is placed in powerdown mode. The minimum setup time for GPO1 and GPO2 before RST = 1 is 30 ns when actively driven by the system controller and 100 µs if the internal 1 M resistor is allowed to set the default GPO1 (high) and GPO2 (low). Refer to the Si471x data sheet for specific reset timing requirements. Table 24. Bus Mode Selection Bus Mode GPO2/INT GPO1 3-wire SPI 2-wire 0 1 (must drive) 0 0 (must drive) 1 1 In powerdown mode, all circuitry is disabled except for the device control interface. The device comes out of powerdown mode when the POWER_UP command is written to the command register. Once in powerup mode, the device accepts additional commands, such as tuning, and the setting of properties, such as power level. The device will not accept commands while in powerdown mode, with the exception of the powerup command. If the system controller writes a command other than POWER_UP when in powerdown mode, the device does not respond, and a reset is required. Setting the RST pin low places the device in reset mode. In reset mode, all circuitry is disabled including the device control interface; registers are set to their default settings, and the control bus is disabled. 6.1. 2-Wire Control Interface Mode Figures 17 and 18 show the 2-wire Control Interface Read and Write Timing Parameters and Diagrams, respectively. Refer to the Si471x data sheet for timing parameter values. SCLK SDIO tSU:STA tHD:STA tLOW START tr:IN tHIGH tr:IN tf:IN tSP tSU:STO tBUF 70% 30% 70% 30% tHD:DAT tSU:DAT tf:IN, tf:OUT STOP START Figure 17. 2-wire Control Interface Read and Write Timing Parameters Rev. 0.7 223 AN332 SCLK A6-A0, R/W SDIO START ADDRESS + R/W D7-D0 ACK D7-D0 DATA ACK DATA ACK STOP Figure 18. 2-wire Control Interface Read and Write Timing Diagram 2-wire bus mode uses only the SCLK and SDIO pins for signaling. A transaction begins with the START condition, which occurs when SDIO falls while SCLK is high. Next, the system controller drives an 8-bit control word serially on SDIO, which is captured by the device on rising edges of SCLK. The control word consists of a seven-bit device address followed by a read/write bit (read = 1, write = 0). The device acknowledges the control word by driving SDIO low on the next falling edge of SCLK. Although the device responds to only a single device address, this address can be changed with the SEN pin (note that the SEN pin is not used for signaling in 2-wire mode). When SEN = 0, the seven-bit device address is 0010001b. When SEN = 1, the address is 1100011b. For write operations, the system controller next sends a data byte on SDIO, which is captured by the device on rising edges of SCLK. The device acknowledges each data byte by driving SDIO low for one cycle on the next falling edge of SCLK. The system controller may write up to 8 data bytes in a single 2-wire transaction. The first byte is a command, and the next seven bytes are arguments. Writing more than 8 bytes results in unpredictable device behavior. For read operations, after the device has acknowledged the control byte, it will drive an eight-bit data byte on SDIO, changing the state of SDIO on the falling edges of SCLK. The system controller acknowledges each data byte by driving SDIO low for one cycle on the next falling edge of SCLK. If a data byte is not acknowledged by the system controller, the transaction will end. The system controller may read up to 16 data bytes in a single 2-wire transaction. These bytes contain the status byte and response data from the device. A 2-wire transaction ends with the STOP condition, which occurs when SDIO rises while SCLK is high. Table 25 demonstrates the command and response procedure implemented in the system controller to use the 2wire bus mode. In this example the TX_TUNE_FREQ command is demonstrated. Table 25. Command and Response Procedure - 2-Wire Bus Mode 224 Action Data CMD ARG1 ARG2 ARG3 STATUS 0x30 0x00 0x27 0x7E 0x80 Description TX_TUNE_FREQ Set Station to 101.1 MHz (0x277E = 10110 with 10 kHz step size) Reply Status. Clear-to-send high. Rev. 0.7 AN332 To send the TX_TUNE_FREQ command and arguments, the system controller sends the START condition, followed by the 8-bit control word, which consists of a seven-bit device address (0010001b SEN = 0 or 1100011b SEN = 1) and the write bit (0b) indicated by ADDR+W = 00100010b = 0x22. In this example, SEN = 0 resulting in the control word ADDR+W = 00100010b = 0x22. If instead SEN = 1, the resulting control word would be ADDR+W = 11000110b = 0xC6. The device acknowledges the control word by setting SDIO = 0, indicated by ACK = 0. The system controller then sends the CMD byte, 0x30, and again the device acknowledges by setting ACK = 0. The system controller and device repeat this process for the ARG1, ARG2, and ARG3 bytes. Commands may take up to seven argument bytes, and this flexibility should be designed into the 2-wire bus mode implementation. Alternatively, all seven argument bytes may be sent for all commands, but unusual arguments must be 0x00. Unpredictable device behavior will result if more than seven arguments are sent. START START ADDR+W 0x22 ACK 0 CMD 0x30 ACK 0 ARG1 0x00 ACK 0 ARG2 0x27 ACK 0 ARG3 0x7E ACK 0 STOP STOP To read the status and response from the device, the system controller sends the START condition, followed by the eight-bit control word, which consists of the seven bit device address and the read bit (1b). In this example, SEN = 0 and the write control word is ADDR+R = 00100011b = 0x23. If SEN = 1, the write control word would be ADDR+R = 11000111b = 0xC7. The device acknowledges the control word by setting ACK = 0. Next the system controller reads the STATUS byte. In this example, the STATUS byte is 0x00, indicating that the CTS bit, bit 8, has not been set. The response bytes are not ready for reading and that the device is not ready to accept another command. The system controller sets SDIO = 1, indicated by NACK = 1, to signal to the device the 2-wire transfer will end. The system controller should set the STOP condition. This process is repeated until the STATUS byte indicates that CTS bit is set, 0x80 in this example. START START ADDR+R 0x23 ACK 0 STATUS 0x00 NACK 1 STOP STOP When the STATUS byte returns CTS bit set, 0x80 in this example, the system controller may read the response bytes from the device. The controller sets ACK = 0 to indicate to the device that additional bytes will be read. The RESP1 byte is read by the system controller, followed by the system controller setting ACK = 0. This is repeated for RESP2. RESP3 is read by the system controller followed by the system controller setting NACK = 1, indicating that RESP3 is the last byte to be read. The system controller then sets the STOP condition. Responses may be up to 15 bytes in length (RESP1–RESP15) depending on the command. It is acceptable to read all 15 response bytes. However, unused response bytes return random data and must be ignored. Note that the TX_TUNE_FREQ command returns only the STATUS byte and response bytes are shown only for completeness. START ADDR+R START 0x23 ACK 0 STATUS 0x80 ACK 0 RESP1 0x00 Rev. 0.7 ACK 0 RESP2 0x00 ACK 0 RESP3 NACK 0x00 1 STOP STOP 225 AN332 6.2. 3-Wire Control Interface Mode Figures 19 and 20 show the 3-wire Control Interface Read and Write Timing Parameters and Diagrams, respectively. Refer to the Si471x data sheet for timing parameter values. SCLK 70% 30% tS SEN SDIO 70% tHSDIO tHIGH A0 D15 tLOW tHSEN tS 30% 70% 30% A7 A6-A5, R/W, A4-A1 D14-D1 Address In D0 Data In Figure 19. 3-Wire Control Interface Write Timing Parameters SCLK 70% 30% tHSDIO tS SEN 70% tCDV tHSEN tCDZ tS 30% 80% SDIO A7 20% A6-A5, R/W, A4-A1 Address In A0 D15 ½ Cycle Bus Turnaround D14-D1 D0 Data Out Figure 20. 3-Wire Control Interface Read Timing Parameters 3-wire bus mode uses the SCLK, SDIO and SEN pins. A transaction begins when the system controller drives SEN low. Next, the system controller drives a 9-bit control word on SDIO, which is captured by the device on rising edges of SCLK. The control word is comprised of a three bit chip address (A7:A5 = 101b), a read/write bit (write = 0, read = 1), the chip address (A4 = 0), and a four bit register address (A3:A0). For write operations, the control word is followed by a 16-bit data word, which is captured by the device on rising edges of SCLK. For read operations, the control word is followed by a delay of one-half SCLK cycle for bus turnaround. Next, the device drives the 16-bit read data word serially on SDIO, changing the state of SDIO on each rising edge of SCLK. For read operations, the control word is followed by a delay of one-half SCLK cycle for bus turn-around. Next, the device drives the 16-bit read data word serially on SDIO, changing the state of SDIO on each rising edge of SCLK. A transaction ends when the system controller sets SEN = 1, then pulses SCLK high and low one final time. SCLK may either stop or continue to toggle while SEN is high. In 3-wire mode, commands are sent by first writing each argument to register(s) 0xA1–0xA3, then writing the command word to register 0xA0. A response is retrieved by reading registers 0xA8–0xAF. 226 Rev. 0.7 AN332 Table 26. Register Map for 3-Wire Mode 3w Addr Name A0h COMMAND1 CMD ARG1 A1h COMMAND2 ARG2 ARG3 A2h COMMAND3 ARG4 ARG5 A3h COMMAND4 ARG6 ARG7 A4h Reserved1 Reserved Reserved A5h Reserved2 Reserved Reserved A6h Reserved3 Reserved Reserved A7h Reserved4 Reserved Reserved D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 A8h STATUS/ CTS ERR RESPONSE1 RSDIN RDSIN ASQ- STCIN T T INT T A9h RESPONSE2 RESP2 RESP3 AAh RESPONSE3 RESP4 RESP5 ABh RESPONSE4 RESP6 RESP7 ACh RESPONSE5 RESP8 RESP9 ADh RESPONSE6 RESP10 RESP11 AEh RESPONSE7 RESP12 RESP13 AFh RESPONSE8 RESP14 RESP15 RESP1 In 3-wire mode, the control registers are accessed as 16-bit entities (2 byte). In Table 26, the full 8-bit 3-wire address is shown, including the chip’s fixed base address (A7:A4 = 1010b). The first two bytes in a command stream uses register COMMAND1. The CMD byte occupies register COMMAND1[15:8], while ARG1 occupies register COMMAND1[7:0]. Commands with an odd number of bytes must have the lower 8 bits of the register containing the final argument byte filled with 0x00. Registers which are not specified by the command must either not be written, or must be filled with 0x0000 (user's discretion). Writing register COMMAND1 causes the command to execute. As a consequence, all registers containing applicable argument bytes must be written (in any order) prior to writing register COMMAND1. For example, when sending the SET_PROPERTY command, write registers COMMAND2..COMMAND3 first, then register COMMAND1. Note that ARG1 is part of register COMMAND1 and must be written at the same time as CMD. The contents of registers STATUS/RESPONSE1..RESPONSE8 are not valid until the CTS bit (STATUS/RESPONSE1[15]) is set. RESPONSE1[13:8] is updated after sending the GET_INT_STATUS command. Response bytes which are not specified in the response byte stream are not guaranteed to be 0x00 and should be ignored. For example, GET_PROPERTY has 4 bytes of response data in registers RESPONSE1..RESPONSE2. The contents of registers RESPONSE3..RESPONSE8 are meaningless and not guaranteed to be 0x0000. Likewise, for commands which have an odd number of response bytes, or a single status byte, the least significant byte (bits 7:0) of the final register is meaningless, and not guaranteed to be 0x00. Table 27 demonstrates the command and response procedure implemented in the system controller to use the 3wire bus mode. In this example the TX_TUNE_FREQ command is demonstrated. Table 27. Command and Response Procedure - 3-Wire Bus Mode Action CMD ARG1 ARG2 ARG3 STATUS Data 0x30 0x00 0x27 0x7E 0x80 Description TX_TUNE_FREQ. Set Station to 101.1 MHz (0x277E = 10110 with 10 kHz step size) Reply Status. Clear-to-send high. Rev. 0.7 227 AN332 To send the TX_TUNE_FREQ command and arguments, the system controller sets SEN = 0. Next, the controller drives the 9-bit control word on SDIO, consisting of the device address (A7:A5 = 101b), the write bit (0b), the device address (A4 = 0), and the register address for the COMMAND2 register (A3:A0 = 0001b). The control word is followed by a 16-bit data word, consisting of ARG2 followed by ARG3. The system controller then sets SEN = 1 and pulses the SCLK high and then low one final time. For commands requiring additional arguments, in the COMMAND3 (ARG3, ARG4) and COMMAND4 (ARG5, ARG6) registers, the system controller would send these next. SEN CTL ARG2 ARG3 SEN SCLK 10 101000001b 0x27 0x7E 01 Pulse Next the system controller initiates the command by setting SEN = 0 and driving the 9-bit control word on SDIO, consisting of the device address (A7:A5 = 101b), the write bit (0b), the device address (A4 = 0), and the register address for the COMMAND1 register (A3:A0 = 0000b). The control word is followed by a 16-bit data word, consisting of the CMD byte followed by ARG1 byte. The system controller then sets SEN = 1 and pulses the SCLK high and then low one final time. SEN CTL CMD ARG1 SEN SCLK 10 101000000b 0x30 0x00 01 Pulse To read the status and response from the device, the system controller sets SEN = 0. Next, the controller drives the 9-bit control word 101101000b on SDIO, consisting of the device address (A7:A5 = 101b), the read bit (1b), the device address (A4 = 0), and the register address for the STATUS/RESPONSE1 register (A3:A0 = 1000b). The control word is followed by a 16-bit data word, consisting of STATUS followed by RESPONSE1. The system controller then sets SEN = 1 and pulses the SCLK high and then low one final time. In this example, the STATUS byte is 0x00, indicating that the CTS bit, bit 8, has not been set and that the response bytes are not ready for reading and that the device is not ready to accept another command. RESP1 will be random until the CTS bit is set. This process should be repeated until the STATUS byte indicates that CTS bit is set, 0x80 in this example. SEN CTL STATUS RESP1 SEN SCLK 10 101101000b 0x00 0x00 01 Pulse When the STATUS byte indicates that the CTS bit has been set, 0x80 in this example, the system controller may read the RESPONSE bytes from the device in any order. 228 SEN CTL STATUS RESP1 SEN SCLK 10 101101000b 0x80 0x00 01 Pulse Rev. 0.7 AN332 6.3. SPI Control Interface Mode Figures 21 and 22 show the SPI Control Interface Read and Write Timing Parameters and Diagrams, respectively. Refer to the Si471x data sheet for timing parameter values. SCLK 70% 30% tHIGH SEN SDIO tLOW tHSDIO tHSEN 70% 30% 70% 30% tS tS C7 C6–C1 C0 D7 D6–D1 Control Byte In D0 8 Data Bytes In Figure 21. SPI Control Interface Write Timing Parameters SCLK 70% 30% tCDV tS SEN 70% tHSEN tHSDIO tS 30% tCDZ SDIO or GPO1 70% C7 C6–C1 C0 D7 D6–D1 D0 30% Control Byte In Bus Turnaround 16 Data Bytes Out Figure 22. SPI Control Interface Read Timing Parameters SPI bus mode uses the SCLK, SDIO and SEN pins for read/write operations. The system controller can choose to receive read data from the device on either SDIO or GPO1. A transaction begins when the system controller drives SEN = 0. The system controller then pulses SCLK eight times, while driving an 8-bit control byte serially on SDIO. The device captures the data on rising edges of SCLK. The control byte must have one of five values:      0x48 = write a command (controller drives 8 additional bytes on SDIO) 0x80 = read a response (device drives one additional byte on SDIO) 0xC0 = read a response (device drives 16 additional bytes on SDIO) 0xA0 = read a response (device drives one additional byte on GPO1) 0xE0 = read a response (device drives 16 additional bytes on GPO1) For write operations, the system controller must drive exactly 8 data bytes (a command and arguments) on SDIO after the control byte. The data is captured by the device on the rising edge of SCLK. Rev. 0.7 229 AN332 For read operations, the controller must read exactly one byte (STATUS) after the control byte or exactly 16 data bytes (STATUS and RESP1–RESP15) after the control byte. The device changes the state of SDIO (or GPO1, if specified) on the falling edge of SCLK. Data must be captured by the system controller on the rising edge of SCLK. Keep SEN low until all bytes have transferred. A transaction may be aborted at any time by setting SEN high and toggling SCLK high and then low. Commands will be ignored by the device if the transaction is aborted. Table 28 demonstrates the command and response procedure that would need to be implemented in the system controller to use the SPI bus mode. In this example the TX_TUNE_FREQ command is demonstrated. Table 28. Command and Response Procedure - SPI Bus Mode Action Data Description CMD 0x30 ARG1 0x00 ARG2 0x27 Set Station to 101.1 MHz ARG3 0x7E (0x277E = 10110 with 10 kHz step size) STATUS 0x80 TX_TUNE_FREQ Reply Status. Clear-to-send high. To send the TX_TUNE_FREQ command and arguments, the system controller sets SEN = 0, sends the control byte 0x48, followed by the CMD byte and seven argument bytes, ARG1-ARG7, followed by setting SEN = 1. Note that all seven argument bytes must be sent by the controller or the command will fail. Unused arguments must be written as 0x00. SEN CTL CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 SEN 10 0x48 0x30 0x00 0x27 0x7E 0x00 0x00 0x00 0x00 01 To read the status and response from the device, the system controller sets SEN = 0 and sends the control byte 0x80 to read the response on SDIO (or the control byte 0xA0 to read the response on GPO1). Next the system controller reads the STATUS byte. In this example, the STATUS byte is 0x00, indicating that the CTS bit, bit 8, has not been set and that the response bytes are not ready for reading. The device is not ready to accept another command. The system controller sets SEN = 1 to end the transfer. This process should be repeated until the STATUS byte indicates that CTS bit is set, 0x80 in this example. SEN CTL STATUS SEN 10 0x80 0x00 01 When the STATUS byte indicates that the CTS bit has been set, 0x80 in this example, the system controller may read the response bytes from the device. To read the status and response from the device, the system controller sets SEN = 0 and sends the control byte 0xC0 to read the response on SDIO (or the control byte 0xE0 to read the response on GPO1). Note that all 16 response bytes must be read from the device. Unused response bytes are random and should be ignored. Note that the TX_TUNE_FREQ command returns only the STATUS byte and RESP1–RESP15 bytes are shown only for completeness. SEN CTL STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 RESP9 RESP10 RESP11 RESP12 RESP13 RESP14 RESP15 SEN 1  0 0xC0 230 0x80 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 Rev. 0.7 0x00 0x00 0x00 0x00 0x00 0x00 0x00 01 AN332 7. Powerup There are two procedures for booting the device to move it from powerdown mode to the powerup mode. The first and most common is a boot from internal device memory. The second is a boot from a firmware patch that is written from the system controller to the device. To power up the device: 1. Supply VDD and VIO while keeping the RST = 0. The minimum VDD and VIO rise time is 25 µs, and VDD and VIO must be stable 250 µs before setting RST = 1. Power supplies may be sequenced in any order. RST is in the VIO supply domain and therefore RST = 0 must be maintained before VIO is supplied. 2. Set GPO1 and GPO2 for the desired bus mode. The minimum setup time for GPO1 and GPO2 before RST = 1 is 30 ns when actively driven by the system controller and 100 µs if the internal 1 M resistor is allowed to set the default GPO1 (high) and GPO2 (low). 3. Set RST = 1. 4. Write POWER_UP to the command register. The POWER_UP command instructs the device to boot from internal memory, see Section “7.1. Powerup from Device Memory”, or from a firmware patch sent from the system controller, see Section “7.2. Powerup from a Component Patch”. After CTS = 1, the device is ready to commence normal operation and accept additional commands. The POWER_UP command configures the state of DIN (pin 13), DFS (pin 14), and RIN (pin 15) and LIN (pin 16) for analog or digital audio modes and GPO2/INT for interrupt operation. Prior to this command these pins are set to high impedance. The GPIO_CTL and GPIO_SET commands configure the state of GPO2/INT and GPO3. Prior to this command these pins are set to high impedance. 5. Provide RCLK. Note that the RCLK buffer is in the VIO supply domain and may therefore be supplied at any time after VIO is supplied. The RCLK must be valid 10 ns before any command that enables the TX carrier, such as the TX_TUNE_FREQ command, and for 10 ns after any command that disables the carrier, such as the TX_TUNE_POWER command with a value of 0x00. The RCLK is required for proper AGC operation when the carrier is enabled. The RCLK may be removed or reconfigured when the carrier is disabled. >25 us VDD >250 us VIO RSTB >10 ns >10 ns RCLK Control Bus POWER_UP Command TX_TUNE FREQ Command Figure 23. Device Power Up Timing Rev. 0.7 231 AN332 7.1. Powerup from Device Memory Table 29. Using the POWER_UP Command for the FM Transmitter Action Data CMD ARG1 ARG2 RESP1 0x01 0x02 0x50 0x80 Description POWER_UP Set to FM Transmit. Set to Analog Line Input. Reply Status. Clear-to-send high. 1. Send the POWER_UP command by writing the CMD field with value 0x01. 2. Send argument 1 of the power up command 0x02 (no patch, CTS and GPO2 interrupts disabled, FM transmit selected). Optionally various interrupts such as the CTS interrupt can be enabled by varying this argument, see Section “5. Commands and Properties”. 3. Send argument 2 of the power up command 0x50 (analog input selected) 4. Poll the CTS bit until it has been set high, or until a CTS interrupt is received if CTS interrupt is enabled. Table 30. Using the POWER_UP command for the FM Receiver Action CMD ARG1 ARG2 STATUS Data 0x01 0x00 0x05 0x80 Description POWER_UP Set to FM Receive. Set to Analog Out. Reply Status. Clear-to-send high. 1. Send the POWER_UP command by writing the CMD field with value 0x01. 2. Send ARG1, 0x00 (no patch, CTS and GPO2 interrupts disabled, FM receive selected). Optionally various interrupts such as the CTS interrupt can be enabled by varying this argument, see Section “5. Commands and Properties”. 3. Send ARG2, 0x05 (analog output is selected) 4. Poll the CTS bit until it has been set high, or until a CTS interrupt is received (if CTS interrupt is enabled). Table 31. Using the POWER_UP Command for the AM/SW/LW Receiver Action CMD ARG1 ARG2 STATUS Data 0x01 0x01 0x05 0x80 Description POWER_UP Set to AM/SW/LW Receive. Set to Analog Out. Reply Status. Clear-to-send high. 1. Send the POWER_UP command by writing the CMD field with value 0x01. 2. Send ARG1, 0x01 (no patch, CTS and GPO2 interrupts disabled, AM/SW/LW receive selected). Optionally various interrupts such as the CTS interrupt can be enabled by varying this argument, see Section “5. Commands and Properties”. 3. Send ARG2, 0x05 (analog output selected) 4. Poll the CTS bit until it has been set high, or until a CTS interrupt is received (if CTS interrupt is enabled). 232 Rev. 0.7 AN332 Table 32. Using the POWER_UP Command for the FM Transmitter Action Data CMD ARG1 ARG2 STATUS 0x01 0x03 0x05 0x80 Description POWER_UP Set to Weather Band Receive. Set to Analog Out. Reply Status. Clear-to-send high. 1. Send the POWER_UP command by writing the CMD field with value 0x01. 2. Send ARG1, 0x03 (no patch, CTS and GPO2 interrupts disabled, weather band receive selected). Optionally various interrupts such as the CTS interrupt can be enabled by varying this argument. See Section “5. Commands and Properties”. 3. Send ARG2, 0x05 (analog output selected). 4. Poll the CTS bit until it has been set high or until a CTS interrupt is received (if CTS interrupt is enabled). 7.2. Powerup from a Component Patch The device has the ability to receive component patches from the system controller to modify sections or all of the device memory. 7.2.1. Patching Capabilities In order to support interim updates to the device component, patches can be applied to the component by the system controller via a download mechanism. Patches can be provided by Silicon Laboratories to customers to address field issues, errata, or adjust device behavior. Patches are unique to a particular device firmware version and cannot be generated by customers. Patches can be used to replace a portion of the component (to address errata for example) or to download an entirely new component image (to allow a customer to test a new component release on their device prior to receiving programmed parts). Patches are tagged with a unique identification to allow them to be tracked and are encrypted requiring the customer to use a tag when downloading to allow the Si47xx to decrypt the patch. Prior to downloading a partial patch, the user must confirm that the device contains the correct firmware and library to support the patch. 7.2.1.1. Examples An FM transmitter component patch for Si471x firmware 2.0 with library R4 does not support Si471x firmware 1.0 with library R0. For a programmatic indication, the POWER_UP command can be used to confirm the device library and firmware version. For a visual indication, the marking on the device can be used to confirm the firmware version. Tables 33 through 38 summarize the library and firmware mapping and compatibility. Table 33. Si4704/05 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component Si4704/05-B20 2.0 R8 2.0 Si4704/05-C40 4.0 R10 5.0 Si4704/05-D50 5.0 R11 7.0 Si4704/05-D60 6.0 R11 7.0 Rev. 0.7 233 AN332 Table 34. Si4706 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component Si4706-B20 2.0 R8 3.0 Si4706-C30 3.0 R10 5.1 Si4706-D50 5.0 R11 7.0 Table 35. Si4707 Firmware, Library, and Component Compatibility Part # Firmware Library WBRX Component Si4707-B20 2.0 R9 1.0 Table 36. Si4710/11/12/13 Firmware, Library, and Component Compatibility Part # Firmware Library FMTX Component Si4710-A10 1.0 R0 1.0 Si4710/11/12/13-A20 2.0 R4 2.0 Si4710/11/12/13-B30 3.0 R8 3.0 Si4710/11/12/13-B31 3.1 R8 3.1 Table 37. Si4720/21 Firmware, Library, and Component Compatibility Part # Firmware Library FMTX Component FMRX Component Si4720-A10 1.0 R4 2.0 1.0 Si4720/21-B20 2.0 R8 3.0 2.0 Table 38. Si4730/31 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component AM_SW_LW RX Component Si4730-A10 1.0 R4 1.0 1.0 Si4730/31-B20 2.0 R9 2.0 2.0 Si4730/31-C40 4.0 R10 6.0 5.0 Si4730/31-D50 5.0 R11 7.0 6.0 Si4730/31-D60 5.0 R11 7.0 6.0 Table 39. Si4740/41/42/43/44/45 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component AMRX Component WBRX Component Si4740/41-C10 1.0 R10 4.0 3.0 N/A Si4742/43-C10 1.0 R10 4.0 3.0 3.0 Si4744/45-C10 1.0 R10 4.0 3.0 N/A 234 Rev. 0.7 AN332 Table 40. Si4749 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component Si4749-C10 1.0 R10 4.0 Table 41. Si4734/35 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component AM_SW_LWRX Component Si4734/35-B20 2.0 R9 2.0 2.1 Si4734/35-C40 4.0 R10 6.0 5.0 Si4734/35-D50 5.0 R11 7.0 6.0 Si4734/35-D60 5.0 R11 7.0 6.0 Table 42. Si4736/37 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component AM_SW_LWRX Component WBRX Component Si4736/37-B20 2.0 R9 2.0 2.0 1.0 Si4736/37-C40 4.0 R10 6.0 5.0 5.0 Table 43. Si4738/39 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component WBRX Component Si4738/39-B20 2.0 R9 2.0 1.0 Si4738/39-C40 4.0 R10 6.0 5.0 Table 44. Si4784/85 Firmware, Library, and Component Compatibility Part # Firmware Library FMRX Component Si4784/85-B20 2.0 R8 2.0 Si4784/85-D50 5.0 R11 7.0 Rev. 0.7 235 AN332 7.2.2. Patching Procedure Patching is accomplished by sending a series of commands to the device. These commands are sent in the same manner as any other device commands and can be sent over any of the command busses (2-wire, 3-wire, SPI). The first command that is sent to the device is the POWER_UP command to confirm that the patch is compatible with the internal device library revision. The device moves into the powerup mode, returns the reply, and moves into the powerdown mode. The POWER_UP command is sent to the device again to configure the mode of the device and additionally is used to start the patching process. When applying the patch, the PATCH bit in ARG1 of the POWER_UP command must be set to 1 to begin the patching process. Once the POWER_UP command is sent and the device is placed in patch mode, the patch file can be sent to the device. The patch file typically has a .csg extension. It is formatted into 8 columns, consisting of a leading command (0x15 or 0x16), and 7 arguments. The controlling system must send each line of 8 bytes, wait for a CTS, then send the next set of 8, etc., until the entire patch has been sent. An example showing the first few lines and final line of a patch file is shown below. The patch download mechanism is verified with a checksum embedded in the patch download. If the checksum fails, the part issues an error code, ERR (bit 6 of the one byte reply that is available after each 8-byte transfer), and halts. The part must be reset to recover from this error condition. The following is an example of a patch file. # Copyright 2006 Silicon Laboratories, Inc. # Patch generated 21:09 August 09 2006 # fmtx version 0.0 alpha 0x15,0x00,0x0B,0x1D,0xBB,0x14,0xC4,0xA1 0x16,0x98,0x81,0xD9,0x71,0xED,0x0E,0xAC . . [up to 1979 additional lines] . . 0x15,0x00,0x00,0x00,0x00,0x00,0x49,0xFD A full memory patch requires 15856 bytes of system controller memory, however, most patches require significantly less memory. In 2-wire mode, a full memory patch download requires approximately 500 ms at a 400 kHz clock rate. The following is an example of the commands required to boot the device from powerdown mode using the patch file in the previous example. The device has completed the boot process when the CTS bit is set high after the last byte in the file is transferred and is ready to accept additional commands and proceed with normal operation. Table 45 provides an example of using the POWER_UP command with patching enabled. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response (RESP). The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. 236 Rev. 0.7 AN332 Table 45. Example POWER_UP Command with Patching Enabled Action Data CMD ARG1 ARG2 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 CMD ARG1 ARG2 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS 0x01 0xCF 0x50 0x80 0x0D 0x32 0x30 0x00 0x00 0x41 0x04 0x01 0xE2 0x50 0x80 0x15 0x00 0x0B 0x1D 0xBB 0x14 0xC4 0xA1 0x80 0x16 0x98 0x81 0xD9 0x71 0xED 0x0E 0xAC 0x80 CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS 0x15 0x00 0x00 0x00 0x00 0x00 0x49 0xFD 0x80 Description POWER_UP Set to Read Library ID, Enable Interrupts. Set to Analog Line Input. Reply Status. Clear-to-send high. Part Number, HEX (0x0D = Si4713) Firmware Major Rev, ASCII (0x32 = 2) Firmware Minor Rev, ASCII (0x30 = 0) Reserved Reserved Chip Rev, ASCII (0x41 = revA) Library ID, HEX (0x04 = library 4) POWER_UP Set to FM Transmit, set patch enable, enable interrupts. Set to Analog Line Input. Reply Status. Clear-to-send high. Reserved for Patch. Reply Status. Clear-to-send high. Reserved for Patch. Reply Status. Clear-to-send high. . . [up to 1979 additional lines] . Reserved for Patch. Reply Status. Clear-to-send high. Rev. 0.7 237 AN332 8. Powerdown The procedure for moving the device from powerup to powerdown modes requires writing the POWER_DOWN command. Table 46. Using the POWER_DOWN command Action CMD STATUS Data Description 0x11 POWER_DOWN 0x80 Reply Status. Clear-to-send high. To Power Down the device and remove VDD and VIO (optional): 1. Write TX_TUNE_POWER to the command register to disable the carrier. 2. Set RCLK = 0 (optional). Note that the RCLK buffer is in the VIO supply domain and may therefore be supplied at any time that VIO is supplied. The RCLK must be valid 10 ns before and 10 ns after sending the TX_TUNE_MEASURE, TX_TUNE_FREQ, and TX_TUNE_POWER commands. In addition, the RCLK must be valid at all times when the carrier is enabled for proper AGC operation. The RCLK may be removed or reconfigured at other times. The RCLK is required for proper AGC operation when the carrier is enabled. The RCLK may be removed or reconfigured when the carrier is disabled. 3. Write POWER_DOWN to the command register. Note that all register contents will be lost. 4. Set RST = 0. Note that RST must be held high for 10 ns after the completion of the POWER_DOWN command. 5. Remove VDD (optional). 6. Remove VIO (optional). Note that VIO must not be removed without removing VDD. Unexpected device operation may result. VDD VIO RSTB RCLK >10 ns Control Bus TX_TUNE POWER Command >10 ns POWER_DOWN Command Figure 24. Device Power Down Timing 238 Rev. 0.7 AN332 9. Digital Audio Interface The digital audio interface operates in slave mode and supports 3 different audio data formats:    I2S Left-Justified DSP Mode In I2S mode, the MSB is captured on the second rising edge of DCLK following each DFS transition. The remaining bits of the word are sent in order down to the LSB. The Left Channel is transferred first when the DFS is low, and the Right Channel is transferred when the DFS is high. In Left-Justified mode, the MSB is captured on the first rising edge of DCLK following each DFS transition. The remaining bits of the word are sent in order down to the LSB. The Left Channel is transferred first when the DFS is high, and the Right Channel is transferred when the DFS is low. In DSP mode, the DFS becomes a pulse with a width of 1 DCLK period. The Left Channel is transferred first, followed right away by the Right Channel. There are two options in transferring the digital audio data in DSP mode: the MSB of the left channel can be transferred on the first rising edge of DCLK following the DFS pulse or on the second rising edge. In all audio formats, depending on the word size, DCLK frequency and sample rates, there may be unused DCLK cycles after the LSB of each word before the next DFS transition and MSB of the next word. The number of audio bits can be configured for 8, 16, 20, or 24 bits. (IFALL = 1) INVERTED DCLK (IFALL = 0) DCLK LEFT CHANNEL DFS I2S (IMODE = 0000) RIGHT CHANNEL 1 DCLK 1 DCLK 1 DIN/DOUT 2 n-2 3 n-1 MSB n 1 LSB MSB 2 n-2 3 n-1 n LSB Figure 25. I2S Digital Audio Format (IFALL = 1) INVERTED DCLK (IFALL = 0) DCLK DFS LEFT CHANNEL RIGHT CHANNEL Left-Justified (IMODE = 0110) DIN/DOUT 1 2 3 n-2 n-1 MSB n 1 LSB MSB 2 n-1 n-2 3 n LSB Figure 26. Left-Justified Digital Audio Format (IFALL = 0) DCLK DFS RIGHT CHANNEL LEFT CHANNEL (IMODE = 1100) DIN/DOUT (MSB at 1st rising edge) 1 2 3 n-2 n-1 MSB DIN/DOUT (MSB at 2nd rising edge) 1 LSB MSB n-1 n 1 LSB MSB 2 n-2 3 1 2 3 n-2 n-1 n LSB LEFT CHANNEL 1 DCLK (IMODE = 1000) n RIGHT CHANNEL MSB 2 3 n-2 n-1 n LSB Figure 27. DSP Digital Audio Format Rev. 0.7 239 AN332 There are two additional properties each for FM Transmitter and AM/FM/SW/LW Receiver associated with using digital audio input/output. Note that digital audio is not supported in WB Receiver. For FM Transmitter: 1. Property 0x0101: DIGITAL_INPUT_FORMAT 2. Property 0x0103: DIGITAL_INPUT_SAMPLE_RATE For AM/FM/SW/LW Receiver: 1. Property 0x0102: DIGITAL_OUTPUT_FORMAT 2. Property 0x0104: DIGITAL_OUTPUT_SAMPLE_RATE The procedure for using a digital audio is as follow: 1. When the device is powered up, the default value for DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE is 0 (disable digital audio in/out). 2. User then must supply DCLK and DFS prior to setting the DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE property. 3. This procedure can be applied anytime after the chip is powered up. 4. User may also change or disable DCLK/DFS during operation. Prior to changing or disabling DCLK/DFS, user has to set the DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE property to 0. After changing or re-enabling DCLK/DFS, user then can set the sample rate property again. 5. The property DIGITAL_INPUT_FORMAT and DIGITAL_OUTPUT_FORMAT does not have a condition, thus it can be set anywhere after power up. Notes: 1. Failure to provide DCLK and DFS prior to setting the sample rate property may cause the chip to go into an unknown state and user must reset the chip. 2. The DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE is the audio sampling rate (DFS rate) and is valid between 32kHz and 48kHz. The following table is a programming example of how to use digital audio. Table 47. Digital Audio Programming Example Action Data Description Action: POWER UP CHIP (look at respective programming example of power up in digital mode). Action: User can send other commands or properties here. Action: Supply DCLK and DFS. CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 240 0x12 0x00 0x01 0x03 or 0x04 0xBB 0x80 →0x80 SET_PROPERTY DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE Sample rate = 0xBB80 = 48000Hz Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 47. Digital Audio Programming Example CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x01 0x01 or 0x02 0x00 0x00 →0x80 SET_PROPERTY DIGITAL_INPUT_FORMAT or DIGITAL_OUTPUT_FORMAT Mode: I2S, stereo, 16bit, sample on rising edge of DCLK Reply Status. Clear-to-send high. Action: User can send other commands or properties here. Action: User needs to change or disable DCLK/DFS. CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x01 0x03 or 0x04 0x00 0x00 →0x80 SET_PROPERTY DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE Sample rate = 0 (disable digital audio) Reply Status. Clear-to-send high. Action: User now is allowed to change or disabling DCLK/DFS. Action: DCLK/DFS has been changed or re-enabled. CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x01 0x03 or 0x04 0xBB 0x80 →0x80 SET_PROPERTY DIGITAL_INPUT_SAMPLE_RATE or DIGITAL_OUTPUT_SAMPLE_RATE Sample rate = 0xBB80 = 48000Hz Reply Status. Clear-to-send high. Action: User can send other commands or properties here. Rev. 0.7 241 AN332 10. Timing There are two indicators: CTS (Clear to Send) and STC (Seek/Tune Complete) to indicate that a command has been accepted and execution completed by the part. After sending every command, the CTS bit will be set indicating that the command has been accepted by the part and it is ready to receive the next command. The CTS bit, on most commands, also indicates that the command has completed execution. These commands are: 1. POWER_UP, POWER_DOWN, GET_REV, GET_PROPERTY, GPIO_CTL, GPIO_SET 2. On FM Transmitter component: TX_TUNE_STATUS, TX_ASQ_STATUS, TX_RDS_BUFF, TX_RDS_PS 3. On FM Receive component: FM_TUNE_STATUS, FM_RSQ_STATUS, FM_RDS_STATUS 4. On AM/SW/LW Receive component: AM_TUNE_STATUS, AM_RSQ_STATUS 5. On WB Receive component: WB_TUNE_STATUS, WB_RSQ_STATUS, WB_ASQ_STATUS The CTS timing model is shown in Figure 28 and the timing parameters for each command are shown in Table 48. Control Bus COMMAND GPO2/ INT tCTS tINT Figure 28. CTS Timing Model In addition to CTS bit, there are a few commands (e.g. TX_TUNE_FREQ or FM_TUNE_FREQ) that use the STC bit to indicate that the command has completed execution. It is highly recommended that user waits for the STC bit before sending the next command. When interrupt is not used, user can poll the status of this STC bit by sending the GET_INT_STATUS command until the STC bit has been set before sending the next command. Commands that use STC bit to indicate execution has been completed: 1. On FM Transmitter component: TX_TUNE_FREQ, TX_TUNE_POWER, TX_TUNE_MEASURE 2. On FM Receive component: FM_TUNE_FREQ, FM_SEEK_START 3. On AM/SW/LW Receive component: AM_TUNE_FREQ, AM_SEEK_START 4. On WB Receive component: WB_TUNE_FREQ The CTS and STC timing model is shown in Figure 29 and the timing parameters for each command are shown in Table 48. 242 Rev. 0.7 AN332 Control Bus COMMAND GPO2/ INT tCTS tINT tINT tSTC Figure 29. CTS and STC Timing Model The SET_PROPERTY command does not have an indicator telling when the command has completed execution, rather the timing is guaranteed and it is called tCOMP. The CTS and SET_PROPERTY command completion timing model tCOMP is shown in Figure 30 and the timing parameters for each command are shown in Table 48. Control Bus COMMAND GPO2/ INT tCTS tINT tCOMP Figure 30. CTS and SET_PROPERTY Command Complete tCOMP Timing Model Rev. 0.7 243 AN332 Table 48. Command Timing Parameters for the FM Transmitter Command POWER_UP tCTS tSTC tCOMP 110 ms — — POWER_DOWN — — GET_REV — — GET_PROPERTY — — GET_INT_STATUS — — PATCH_ARGS — — PATCH_DATA — — TX_ASQ_STATUS — — — — — — — — TX_TUNE_FREQ 100 ms — TX_TUNE_MEASURE 100 ms — TX_TUNE_POWER 20 ms — SET_PROPERTY — 10 ms GPIO_CTL — — GPIO_SET — — TX_RDS_BUFF TX_RDS_PS 300 µs TX_TUNE_STATUS 244 Rev. 0.7 tINT 1 µs AN332 Table 49. Command Timing Parameters for the FM Receiver Command tCTS tSTC tCOMP 110 ms — — POWER_DOWN — — GET_REV — — GET_PROPERTY — — GET_INT_STATUS — — PATCH_ARGS — — PATCH_DATA — — FM_RSQ_STATUS — — — — POWER_UP FM_RDS_STATUS 300 µs FM_TUNE_STATUS — FM_TUNE_FREQ tINT 1 µs — 1 — 2 60 ms FM_SEEK_START 60 ms — SET_PROPERTY — 10 ms FM_AGC_STATUS — — FM_AGC_OVERRIDE — — GPIO_CTL — — GPIO_SET — — Notes: 1. tSTC for FM_TUNE_FREQ / FM_SEEK_START commands is 80 ms on FMRX component 2.0 and earlier. 2. tSTC is seek time per channel. Total seek time depends on bandwidth, channel spacing, and number of channels to next valid channel. Worst case seek time complete for FM_SEEK_START is: – FM_SEEK_BAND_BOTTOM   FM_SEEK_BAND_TOP -------------------------------------------------------------------------------------------------------------------------------------------------+ 1  t    STC FM_SEEK_FREQ_SPACING for USA FM: – 8750-   10790 ----------------------------------+ 1  60 ms = 6.2 s    20 Rev. 0.7 245 AN332 Table 50. Command Timing Parameters for the AM Receiver Command tCTS tSTC tCOMP 110 ms — — POWER_DOWN — — GET_REV — — GET_PROPERTY — — GET_INT_STATUS — — PATCH_ARGS — — PATCH_DATA — — — — — — AM_TUNE_FREQ 80 ms — AM_SEEK_START 80 ms* — SET_PROPERTY — 10 ms GPIO_CTL — — GPIO_SET — — POWER_UP AM_RSQ_STATUS 300 µs AM_TUNE_STATUS tINT 1 µs *Note: tSTC is seek time per channel. The worst-case seek time per channel is 200 ms.Total seek time depends on bandwidth, channel spacing, and number of channels to next valid channel. Worst case seek time complete for AM_SEEK_START is: – AM_SEEK_BAND_BOTTOM-   AM_SEEK_BAND_TOP -------------------------------------------------------------------------------------------------------------------------------------------------+ 1  t    STC AM_SEEK_FREQ_SPACING for USA AM: – 520-   1710 ---------------------------+ 1  200 ms = 24.0 s    10 246 Rev. 0.7 AN332 Table 51. Command Timing Parameters for the WB Receiver Command tCTS tSTC tCOMP 110 ms — — POWER_DOWN — — GET_REV — — GET_PROPERTY — — GET_INT_STATUS — — PATCH_ARGS — — PATCH_DATA — — WB_RSQ_STATUS — — — — — — WB_TUNE_FREQ 250 ms — SET_PROPERTY — 10 ms WB_AGC_STATUS — — WB_AGC_OVERRIDE — — GPIO_CTL — — GPIO_SET — — POWER_UP WB_ASQ_STATUS 300 µs WB_TUNE_STATUS tINT 1 µs Table 52. Command Timing Parameters for the Stereo Audio ADC Mode Command POWER_UP tCTS tCOMP 110 ms — POWER_DOWN — GET_REV — GET_PROPERTY — GET_INT_STATUS — AUX_ASRC_START 300 µs — AUX_ASQ_STATUS — GPIO_CTL — GPIO_SET — SET_PROPERTY tINT 1 µs 10 ms Rev. 0.7 247 AN332 11. FM Transmitter The FM Transmitter audio signal chain involves Audio Dynamic Range Control, Pre-emphasis and Limiter function. Understanding what these three function blocks do in the signal chain will help user in maximizing the volume out of the FM Transmitter. 11.1. Audio Dynamic Range Control for FM Transmitter The audio dynamic range control can be used to reduce the dynamic range of the audio signal. Audio dynamic range reduction increases the transmit volume by decreasing the peak amplitudes of audio signals and increasing the root mean square content of the audio signal. In other words, it amplifies signals below the threshold by a fixed gain and compresses audio signals above the threshold by the ratio of Threshold/(Gain + Threshold). Figure 31 shows an example transfer function of an audio dynamic range controller with the threshold set at –40 dBFS and a Gain = 20 dB relative to an uncompressed transfer function. Input [dBFS] –90 –80 –70 –60 –50 –40 –30 –20 Compression 2:1 dB Threshold = –40 dB –10 0 –10 –20 –30 –40 M=1 –50 Output [dBFS] No Compression –60 M=1 Gain = 20 dB –70 –80 –90 Figure 31. Audio Dynamic Range Transfer Function For input signals below the threshold of –40 dBFS, the output signal is amplified or gained up by 20 dB relative to an uncompressed signal. Audio inputs above the threshold are compressed by a 2 to 1 dB ratio, meaning that every 2 dB increase in audio input level above the threshold results in an audio output increase of 1 dB. In this example, the input dynamic range of 90 dB is reduced to an output dynamic range of 70 dB. The FM Transmitter includes digital audio dynamic range control with programmable gain, threshold, attack rate, and release rate. The total dynamic range reduction is set by the gain value and the audio output compression above the threshold is equal to Threshold/(Gain + Threshold) in dB. The gain specified cannot be larger than the absolute value of the threshold. This feature can also be disabled if audio compression is not desired. Figure 32 shows the time domain characteristics of the audio dynamic range controller. The attack rate sets the speed with which the audio dynamic range controller responds to changes in the input level, and the release rate sets the speed with which the audio dynamic range controller returns to no compression once the audio input level drops below the threshold. When using the audio dynamic range control, care must be taken to configure the device such that the sum of the threshold and gain is zero, or less, as not to distort or overmodulate. 248 Rev. 0.7 AN332 Threshold Audio Input Audio Output Attack time Release time Figure 32. Time Domain Characteristics of the Audio Dynamic Range Controller 11.2. Audio Pre-emphasis for FM Transmitter Pre-emphasis and de-emphasis are techniques used to improve the signal-to-noise ratio of an FM stereo broadcast by reducing the effects of high-frequency noise. A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies and a de-emphasis filter is used by the receiver to attenuate high frequencies and restore a flat frequency response. Depending on the region, a time constant of either 50 or 75 µs is used. The frequency response of both of these filters is shown in Figure 33. For a 75 µs filter, a 15 kHz tone is amplified by ~17 dB. For a 50 µs filter, a 15 kHz tone is amplified by ~13.5 dB. The pre-emphasis time constant is programmable to off, 50 or 75 µs and is setting the TX_PREEMPHASIS property. When using the pre-emphasis filter, care must be taken to account for amplification at high frequencies as not to distort or overmodulate. Preemphasis Filter Transfer Function 20 75 us 50us dB 15 10 5 0 0 3 6 9 12 15 Frequency (kHz) Figure 33. Pre-emphasis Filter Response Rev. 0.7 249 AN332 11.3. Audio Limiter for FM Transmitter A limiter is available to prevent overmodulation by dynamically attenuating the audio level such that the maximum audio deviation does not exceed the level set by the TX_AUDIO_DEVIATION property. The limiter is useful when trying to maximize the audio volume, minimize receiver-generated distortion and prevent overmodulation that may result in violating FCC and ETSI modulation limits. The OVERMOD bit is set by the device when the peak voltage prior to the limiter exceeds the level set by the TX_AUDIO_DEVIATION property. When the limiter is enabled, the OVERMOD bit is an indication that the limiter has dynamically attenuated the audio level. The limiter attack time is instantaneous (within on sample period) and the release time is adjustable with the TX_LIMITER_RELEASE_TIME property. Note: Limiter is enabled by default. 11.4. Maximizing Audio Volume for FM Transmitter The audio input chain is shown in Figure 34: LILEVEL LIATTEN FROM INPUT PGA ADC ACEN ACTHRESH ACATTACK ACRELEASE ACGAIN PREEMPH LIMITEN COMPRESSOR PRE-EMPHASIS LIMITER INLEVEL IALDH IALDL TO MODULATOR OVERMOD Figure 34. Audio Input Chain To maximize audio volume: 1. Set the input line attenuation, line level and audio deviation. The input line attenuation should be set to the lowest setting that is above the maximum level provided by the audio source, either 190, 301, 416 or 636 mVPK. The line level should be set to the maximum source audio level plus headroom. When the limiter is enabled, 2 dB of headroom is recommended. 2 dB of headroom is recommended so that the limiter will not be engaged the entire time it is enabled. When the limiter is disabled and 50 µs pre-emphasis is selected, 13.5 dB of headroom is required. When the limiter is disabled and 75 µS pre-emphasis is selected, 17 dB of headroom is required. Table 53 summarizes these settings: Table 53. Line Input Headroom Pre-emphasis Limiter On (dB) Limiter Off (dB) 250 Off 0 0 50 µs 0 13.5 75 µs 0 17 Rev. 0.7 AN332 The audio deviation should be set as high as possible, with the constraint that the sum of the audio, pilot and RDS deviation must be 75 kHz or less. Typical settings are 66.25 kHz audio deviation, 6.75 kHz pilot deviation and 2 kHz RDS deviation. Example 1: An application providing a 150 mVPK input to the device on RIN/LIN would set Line Attenuation = 00, resulting in a maximum permissible input level of 190 mVPK on LIN/RIN and an input resistance of 396 k. With 50 µS pre-emphasis and the limiter disabled, the Line Level would be set to 150 mVPK and the source level would be adjusted down by 13.5 dB to 30 mVPK to compensate for pre-emphasis. With the limiter enabled, the input source can be maintained at 150 mVPK, but the line level should be set at 188 mVPK to give 2 dB headroom. Example 2: An application providing a 1 VPK input to the device on RIN/LIN would set Line Attenuation = 11, resulting in a maximum permissible input level of 636 mVPK on LIN/RIN and an input resistance of 60 k. An external series resistor on LIN and RIN inputs of 58 k would create a resistive voltage divider that would keep the maximum line level on RIN/LIN below 509 mVPK to give a 2 dB headroom. With input signal at 509 mVPK, 75 µs preemphasis and the limiter enabled, the Line Level can be set to 636 mVPK. 2. Enable the audio dynamic range control In general the greater the sum of threshold and gain, the greater the perceived audio volume. The following examples demonstrate minimal and aggressive compression schemes. When using the audio dynamic range control, care must be taken to configure the device such that the sum of the threshold and gain is zero, or less, as not to distort or overmodulate. In practice, the sum of the threshold and gain will be less than zero to minimize the possibility for distortion. Example 1 (minimal compression): SETPROPERTY: TX_ACOMP_THRESHOLD = –40 dBFS SETPROPERTY: TX_ACOMP_ATTACK_TIME = 5 ms SETPROPERTY: TX_ACOMP_RELEASE_TIME = 100 ms SETPROPERTY: TX_ACOMP_GAIN = 15 dB Example 2 (aggressive compression): SETPROPERTY: TX_ACOMP_THRESHOLD = –15 dBFS SETPROPERTY: TX_ACOMP_ATTACK_TIME = 0.5 ms SETPROPERTY: TX_ACOMP_RELEASE_TIME = 1000 ms SETPROPERTY: TX_ACOMP_GAIN = 5 dB Rev. 0.7 251 AN332 12. Programming Examples This section contains the programming example for each of the function: FM Transmit, FM Receive, AM/SW/LW Receive, and WB Receive. Before each of the example, an overview of how to program the device is shown as a flowchart. Silicon Labs also provides the actual software (example code) and it can be downloaded from mysilabs.com as AN332SW. 12.1. Programming Example for the FM/RDS Transmitter The following flowchart is an overview of how to program the FM/RDS transmitter. RESET CHIP STATE: POWER DOWN Power Up With Patch? Yes Check Chip Library ID POWER_UP with FUNC=15 (command 0x01) No Library ID Compatible w/ patch? POWER UP with GPO2OEN bit enabled (command 0x01) Yes POWER_UP with Patch and GPO2OEN bits enabled (command 0x01) Send Patch Data (command 0x15, 0x16) CHIP STATE: POWER UP Check Chip/FW/Comp rev GET_REV (command 0x10) Chip/FW/Comp Rev are correct? No Contact Silabs For verification Yes 252 Rev. 0.7 No Contact Silabs For verification AN332 Use all default Settings? Set FM Transmit Frequency (command 0x30) Yes No Use Interrupt? Yes Set INT settings (property 0x0001) Use GET_INT_STATUS (command 0x14) or hardware interrupts until STC bit is set No Call TX_TUNE_STATUS with INTACK bit set (command 0x33) Use GPO? Yes Set GPO (command 0x80, 0x81) Set Transmit Power (command 0x31) No Set RCLK settings (property 0x0201, 0x0202) Use GET_INT_STATUS (command 0x14) or hardware interrupts until STC bit is set Call TX_TUNE_STATUS with INTACK bit set (command 0x33) CHIP STATE: TRANSMITTING Rev. 0.7 253 AN332 Mono/Stereo? Set Pilot Deviation & Freq (property 0x2102, 0x2107) Stereo Mono Disable Stereo components (property 0x2100) Enable Stereo components (property 0x2100) Set Audio Deviation (property 0x2101) Transmit RDS? (Si4711/13/21 only) Set RDS Deviation (property 0x2103) Yes No Disable RDS components (property 0x2100) Enable RDS components (property 0x2100) Set RDS properties (property 0x2C00-0x2C07) Send RDS PS Group Type0 (command 0x36) No Send any other RDS Group Type 1-15? Yes Send RDS Group Type 1-15 (command 0x35) 254 Rev. 0.7 AN332 Preemphasis? Yes Enable Preemphasis (property 0x2106) Yes Enable Compressor Settings (property 0x2200-04) Yes Enable Limiter Settings (property 0x2200, 05) No Disable Preemphasis (property 0x2106 = 2) Compressor? No Disable Compressor (property 0x2200) Limiter? No Disable Limiter (property 0x2200) Set FM Transmit Frequency (command 0x30) Use GET_INT_STATUS (command 0x14) or hardware interrupts until STC bit is set Call TX_TUNE_STATUS with INTACK bit set (command 0x33) Set Transmit Power (command 0x31) Use GET_INT_STATUS (command 0x14) or hardware interrupts until STC bit is set Call TX_TUNE_STATUS with INTACK bit set (command 0x33) CHIP STATE: TRANSMITTING Query TX_TUNE_STATUS (command 0x33) Rev. 0.7 255 AN332 Analog/Digital Audio Input? Digital Set audio format (property 0x0101) Analog Clock must be available on DCLK/DFS pin Enable digital audio by setting DFS sample rate (property 0x0103) Set ANALOG input settings (0x2104) Monitor Audio Signal Quality (ASQ)? Yes Set ASQ settings (property 0x2300 - 0x2304) No Query TX_ASQ_STATUS (command 0x34) Optional: Mute or Unmute Audio based on ASQ status (property 0x2105) Want to find an empty channel Using RPS? (Si4712/13/2x only) Yes Send TX_TUNE_MEASURE (command 0x32) No Do host processing On returned RPS value To find empty channels CHIP STATE: Received (Idle) Set FM Transmit Freq and/or Power CHIP STATE: TRANSMITTING 256 Rev. 0.7 LOOP from start_freq to end_freq until DONE AN332 Need to change DCLK/DFS Rate? (digital only) Yes Disable digital audio by setting DFS sample rate to 0 (property 0x0103) No Change DCLK/DFS rate or Disable DCLK/DFS DCLK/DFS has been changed or re-enabled Enable digital audio by setting DFS sample rate (property 0x0103) Change Chip Function To FM Receive? (Si472x only) Yes Send POWER_DOWN (command 0x11) No CHIP STATE: POWER DOWN Repeat any of the instructions above after POWER_UP state To change settings No TRANSMISSION DONE? Yes Send POWER_UP For FM Receive (command 0x01) Send POWER_DOWN (command 0x11) CHIP STATE: POWER UP (FM Receive) CHIP STATE: POWER DOWN Look at FM Receive Flowchart Go back to the very first POWER DOWN state to POWER UP the chip in FM Transmit Table 54 provides an example of programming for the FM/RDS Transmitter. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response (RESP). For SET_PROPERTY commands, the property (PROP) and property data (PROPD) are indicated. The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. Note that in some cases the default properties may be acceptable and no modification is necessary. Refer to Section "5. Commands and Properties" on page 7 for a full description of each command and property. Note: If hardware interrupts are required, the GPO2OEN flag (0x40 ARG1) must be set in the POWER_UP command. Rev. 0.7 257 AN332 Table 54. Programming Example for the FM/RDS Transmitter Action Data Description Action: To power up in analog mode, go to “Powerup in Analog Mode” (bypass “Powerup in Digital Mode”). Powerup in Digital Mode CMD ARG1 ARG2 STATUS 0x01 0xC2 0x0F →0x80 POWER_UP (See Table 28 for patching procedure) Set to FM Transmit. Enable interrupts. Set to Digital Audio Input Reply Status. Clear-to-send high. Action: Go to “Configuration“ (bypass “Powerup in Analog Mode” section). Powerup in Analog Mode CMD ARG1 ARG2 STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x01 0xC2 0x50 →0x80 0x12 0x00 0x21 0x04 0x21 0x5E →0x80 POWER_UP (See Table 28 for patching procedure) Set to FM Transmit. Enable interrupts. Set to Analog Line Input Reply Status. Clear-to-send high. SET_PROPERTY TX_LINE_INPUT_LEVEL Input Range = 419mVPK, 74kΩ Max peak input level = 350mVPK = 0x15E Reply Status. Clear-to-send high Configuration CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 258 0x10 0x00 0x80 0x0D 0x32 0x30 0xE4 0xD6 0x32 0x30 0x41 0x12 0x00 0x00 0x01 0x00 0xC1 0x80 GET_REV Reply Status. Clear-to-send high. Part Number, HEX (0x0D = Si4713) Firmware Major Rev, ASCII (0x32 = 2) Firmware Minor Rev, ASCII (0x30 = 0) Patch ID MSB, example only Patch ID LSB, example only Component Firmware Major Rev, ASCII (0x32 = 2) Component Firmware Minor Rev, ASCII (0x30 = 0) Chip Rev, ASCII (0x41 = revA) SET_PROPERTY GPO_IEN Set STCIEN, ERRIEN, CTSIEN Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x02 0x01 0x7E 0xF4 0x80 0x12 0x00 0x02 0x02 0x01 0x90 0x80 0x12 0x00 0x21 0x05 0x00 0x00 0x80 0x12 0x00 0x21 0x06 0x00 0x01 0x80 0x12 0x00 0x21 0x07 0x4A 0x38 0x80 0x12 0x00 0x21 0x01 0x1A 0xA9 0x80 Description SET_PROPERTY REFCLK_FREQ REFCLK = 32500 Hz Reply Status. Clear-to-send high. SET_PROPERTY RCLK_PRESCALE Divide by 400 (example RCLK = 13 MHz, REFCLK = 32500 Hz) Reply Status. Clear-to-send high. SET_PROPERTY TX_LINE_INPUT_LEVEL_MUTE Sets Left and Right channel mute. Reply Status. Clear-to-send high. SET_PROPERTY TX_PREEMPHASIS 50 µs Reply Status. Clear-to-send high. SET_PROPERTY TX_PILOT_FREQUENCY Sets the pilot or tone generator frequency. Reply Status. Clear-to-send high. SET_PROPERTY TX_AUDIO_DEVIATION 68.25 kHz = 6825d = 0x1AA9 Reply Status. Clear-to-send high. Rev. 0.7 259 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x21 0x02 0x02 0xA3 0x80 Description SET_PROPERTY TX_PILOT_DEVIATION 6.75 kHz = 675d = 0x2A3 Reply Status. Clear-to-send high. Tuning CMD ARG1 ARG2 ARG3 ARG4 STATUS CMD ARG1 ARG2 ARG3 STATUS CMD STATUS CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x31 0x00 0x00 0x73 0x00 0x80 0x30 0x00 0x27 0x7E 0x80 0x14 0x81 0x33 0x01 0x80 0x00 0x27 0x7E 0x00 0x73 0xAB 0x00 0x12 0x00 0x21 0x00 0x00 0x03 0x80 TX_TUNE_POWER Set transmit voltage to 115 dBµV = 115d = 0x73 Set antenna tuning capacitor to auto. Reply Status. Clear-to-send high. TX_TUNE_FREQ Set frequency to 101.1 MHz = 10110d = 0x277E Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. TX_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Frequency = 0x277E = 10110d = 101.1 MHz Transmit voltage = 0x73 = 115d = 115 dBµV Tuning capacitor = 191 (range = 0–191) Received noise level = 0x00 SET_PROPERTY TX_COMPONENT_ENABLE Enable (Stereo) LMR and Pilot Reply Status. Clear-to-send high. Action: In analog mode, go to “Audio Dynamic Range Control (Compressor) and Limiter” (bypass “Input Settings in Digital Mode”). Input Settings in Digital Mode Action: Ensure that DCLK and DFS are already supplied. 260 Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x01 0x03 0xBB 0x80 →0x80 0x12 0x00 0x01 0x01 0x00 0x00 →0x80 Description SET_PROPERTY DIGITAL_INPUT_SAMPLE_RATE Sample rate = 48000Hz = 0xBB80 Reply Status. Clear-to-send high. SET_PROPERTY DIGITAL_INPUT_FORMAT Mode: I2S, stereo, 16bit, sample on rising edge of DCLK. Reply Status. Clear-to-send high. Action: The rest of the programming is the same as analog. Audio Dynamic Range Control (Compressor) and Limiter CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x22 0x01 0xFF 0xD8 0x80 0x12 0x00 0x22 0x04 0x00 0x0F 0x80 0x12 0x00 0x22 0x03 0x00 0x04 0x80 0x12 0x00 0x22 0x02 0x00 0x02 0x80 SET_PROPERTY TX_ACOMP_THRESHOLD Threshold = –40 dBFS = 0xFFD8 Reply Status. Clear-to-send high. SET_PROPERTY TX_ACOMP_GAIN Gain = 15 dB = 0xF Reply Status. Clear-to-send high. SET_PROPERTY TX_ACOMP_RELEASE_TIME Release time = 1000 ms = 4 Reply Status. Clear-to-send high. SET_PROPERTY TX_ACOMP_ATTACK_TIME Attack time = 1.5 ms = 2 Reply Status. Clear-to-send high. Rev. 0.7 261 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 262 Data 0x12 0x00 0x22 0x00 0x00 0x03 0x80 0x12 0x00 0x22 0x05 0x00 0x0D 0x80 0x12 0x00 0x23 0x01 0x00 0xCE 0x80 0x12 0x00 0x23 0x02 0x27 0x10 0x80 0x12 0x00 0x23 0x03 0x00 0xEC 0x80 0x12 0x00 0x23 0x04 0x13 0x88 0x80 Description SET_PROPERTY TX_ACOMP_ENABLE Enable the limiter and compressor. Reply Status. Clear-to-send high. SET_PROPERTY TX_LIMITER_RELEASE_TIME Sets the limiter release time to 13 (39.38 ms) Reply Status. Clear-to-send high. SET_PROPERTY TX_ASQ_LOW_LEVEL –50 dB = 0x00CE Reply Status. Clear-to-send high. SET_PROPERTY TX_ASQ_DURATION_LOW 10000 ms = 0x2710 Reply Status. Clear-to-send high. SET_PROPERTY TX_ASQ_HIGH_LEVEL –20 dB = 0x00EC Reply Status. Clear-to-send high. SET_PROPERTY TX_ASQ_DURATION_HIGH 5000 ms = 0x1388 Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action Data Description CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD STATUS 0x12 0x00 0x23 0x00 0x00 0x07 0x80 0x14 0x82 SET_PROPERTY CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 0x34 0x01 0x80 0x01 0x27 0x7E 0xC9 TX_ASQ_STATUS Clear ASQINT Reply Status. Clear-to-send high. Low flag set. Read Frequency (MSB) Read Frequency (LSB) Input Level (dBFS) = 0xC9 = –55 dB TX_ASQ_INTERRUPT_SELECT Enable overmodulation, high and low thresholds. Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. ASQINT = 1. Note: Allow sufficient time after configuring audio thresholds before checking status. This example assumes no audio input. Received Noise Level (Si4712/13/20/21 Only) CMD ARG1 ARG2 ARG3 ARG4 STATUS CMD STATUS CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 0x32 0x00 0x27 0x7E 0x00 0x80 0x14 0x81 0x33 0x01 0x80 0x00 0x27 0x7E 0x00 0x00 0xAB 0x32 TX_TUNE_MEASURE Set frequency to 101.1 MHz = 10110d = 0x277E Set antenna tuning capacitor to auto. Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. TX_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Frequency = 0x277E = 10110d = 101.1 MHz Transmit Voltage = 0x00 = 0 dBµV (off) Tuning capacitor = 191 (range = 0–191) Received Noise Level = 0x32 = 50d = 50 dBµV Tuning CMD ARG1 ARG2 ARG3 ARG4 STATUS 0x31 0x00 0x00 0x73 0x00 0x80 TX_TUNE_POWER Set transmit voltage to 115 dBµV = 115d = 0x73 Set antenna tuning capacitor to auto. Reply Status. Clear-to-send high. Rev. 0.7 263 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 ARG3 STATUS CMD STATUS CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 Data 0x30 0x00 0x27 0x7E 0x80 0x14 0x81 0x33 0x01 0x80 0x00 0x27 0x7E 0x00 0x73 0xAB 0x32 Description TX_TUNE_FREQ Set frequency to 101.1 MHz = 10110d = 0x277E Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. TX_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Frequency = 0x277E = 10110d = 101.1 MHz Transmit voltage = 0x73 = 115d = 115 dBµV Tuning capacitor = 191 (range = 0–191) Received noise level = 0x32 (last value) RDS (Si4711/13/21 Only) CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 264 0x12 0x00 0x21 0x01 0x19 0xE1 0x80 0x12 0x00 0x21 0x03 0x00 0xC8 0x80 0x12 0x00 0x2C 0x00 0x00 0x01 0x80 0x12 0x00 0x2C 0x01 0x40 0xA7 0x80 SET_PROPERTY TX_AUDIO_DEVIATION 66.25 kHz = 6625d = 0x19E1 Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_DEVIATION (Si4711/13/21 Only) 2 kHz = 200d = 0xC8 Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_INTERRUPT_SOURCE (Si4711/13/21 Only) RDS FIFO MT Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_PI (Si4711/13/21 Only) Sets the RDS PI Code Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x2C 0x02 0x00 0x03 0x80 0x12 0x00 0x2C 0x03 0x10 0x08 0x80 0x12 0x00 0x2C 0x04 0x00 0x03 0x80 0x12 0x00 0x2C 0x05 0x00 0x03 0x80 0x12 0x00 0x2C 0x06 0xE1 0x02 0x80 0x12 0x00 0x2C 0x07 0x00 0x04 0x80 Description SET_PROPERTY TX_RDS_PS_MIX (Si4711/13/21 Only) Sets 50% mix of group 1A (program service) and other buffer/FIFO groups. Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_PS_MISC (Default) (Si4711/13/21 Only) Sets RDSD0 (stereo) and RDSMS (music). Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_PS_REPEAT_COUNT (Si4711/13/21 Only) Sets program service repeat count to 3. Reply Status. Clear-to-send high. SET PROPERTY TX_RDS_PS_MESSAGE_COUNT (Si4711/13/21 Only) Sets PS message count to 3. Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_PS_AF (Si4711/13/21 Only) Sets alternative frequency to 87.7 MHz. Reply Status. Clear-to-send high. SET_PROPERTY TX_RDS_FIFO_SIZE (Si4711/13/21 Only) Sets FIFO size to 3 blocks (value must be one larger than fifo size). Reply Status. Clear-to-send high. Rev. 0.7 265 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS 266 Data 0x36 0x00 0x53 0x49 0x4C 0x41 0x80 0x36 0x01 0x42 0x53 0x20 0x20 0x80 0x36 0x02 0x53 0x49 0x34 0x37 0x80 0x36 0x03 0x31 0x58 0x20 0x20 0x80 0x36 0x04 0x52 0x44 0x53 0x20 0x80 0x36 0x05 0x44 0x45 0x4D 0x4F 0x80 Description TX_RDS_PS (Si4711/13/21 Only) PSID = 0 Set text “SILA” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_PS (Si4711/13/21 Only) PSID = 1 Set text “BS” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_PS (Si4711/13/21 Only) PSID = 2 Set text “SI47” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_PS (Si4711/13/21 Only) PSID = 3 Set text “1X” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_PS (Si4711/13/21 Only) PSID = 4 Set text “RDS” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_PS (Si4711/13/21 Only) PSID = 5 Set text “DEMO” Complete text is “SILABS SI471X RDS DEMO” Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS Data 0x35 0x06 0x20 0x00 0x53 0x49 0x4C 0x49 0x80 0x35 0x04 0x20 0x01 0x43 0x4F 0x4E 0x20 0x80 0x35 0x04 0x20 0x02 0x4C 0x41 0x42 0x4F 0x80 0x35 0x04 0x20 0x03 0x52 0x41 0x54 0x4F 0x80 0x35 0x04 0x20 0x04 0x52 0x49 0x45 0x53 0x80 Description TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF and MTBUFF Set Group 2A, Text Location 0 Set text “SILI” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 1 Set text “CON” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 2 Set text “LABO” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 3 Set text “RATO” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 4 Set text “RIES” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. Rev. 0.7 267 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS 268 Data 0x35 0x04 0x20 0x05 0x20 0x53 0x49 0x34 0x80 0x35 0x04 0x20 0x06 0x37 0x31 0x58 0x20 0x80 0x35 0x04 0x20 0x07 0x52 0x44 0x53 0x20 0x80 0x35 0x04 0x20 0x08 0x44 0x45 0x4D 0x4F 0x80 0x35 0x84 0x40 0x01 0xA7 0x0B 0x2D 0x6C 0x80 Description TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 5 Set text “SI4” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 6 Set text “71X” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 7 Set text “RDS” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set LDBUFF Set Group 2A, Text Location 8 Set text “DEMO” Complete text is “SILICON LABORATORIES SI471X RDS DEMO” Reply Status. Clear-to-send high. TX_RDS_BUFF (Si4711/13/21 Only) Set FIFO and LDBUFF Set Group 4A (real time clock) Set time Sunday 2/18/2007 12:53 (GMT -6:00) Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 54. Programming Example for the FM/RDS Transmitter (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD STATUS CMD ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 CMD STATUS Data 0x12 0x00 0x21 0x00 0x00 0x07 0x80 0x14 0x84 0x35 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x80 0x00 0x5E 0x1E 0x03 0x00 0x11 0x80 Description SET_PROPERTY TX_COMPONENT_ENABLE (Si4711/13/21 Only) Enable (Stereo) LMR, Pilot and RDS. Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. RDSINT = 1 TX_RDS_BUFF (Si4711/13/21 Only) Clear RDSINT Reply Status. Clear-to-send high. No FIFO Overflow. Circular buffer available = 94 Circular buffer used = 30 FIFO available = 0 FIFO used = 3 POWER_DOWN Reply Status. Clear-to-send high. The device sets the CTS bit (and optional interrupt) to indicate that it is ready to accept the next command. The CTS bit also indicates that the POWER_UP, GET_REV, POWER_DOWN, GET_PROPERTY, GET_INT_STATUS, and TX_TUNE_STATUS commands have completed execution. When performing a TX_TUNE_FREQ, TX_TUNE_POWER, or TX_TUNE_MEASURE CTS will indicate that the device is ready to accept the next command even though the operation is not complete. GET_INT_STATUS or hardware interrupts should be used to query for the STC bit to be set prior to performing other commands. Use TX_TUNE_STATUS to clear the STC bit after it has been set. Rev. 0.7 269 AN332 12.2. Programming Example for the FM/RDS Receiver The following is a flowchart showing the overview of how to program the FM/RDS Receiver. RESET CHIP STATE: POWER DOWN Power Up With Patch? Yes Check Chip Library ID POWER_UP with FUNC=15 (command 0x01) No Library ID Compatible w/ patch? POWER UP with GPO2OEN bit enabled (command 0x01) Yes POWER_UP with Patch and GPO2OEN bits enabled (command 0x01) Send Patch Data (command 0x15, 0x16) CHIP STATE: POWER UP Check Chip/FW/Comp rev GET_REV (command 0x10) Chip/FW/Comp Rev are correct? No Contact Silabs For verification Yes 270 Rev. 0.7 No Contact Silabs For verification AN332 Use all default Settings? Set FM Tune Frequency (command 0x20) Yes No Use Interrupt? Yes Set INT settings (property 0x0001) Use GET_INT_STATUS (command 0x14) or hardware interrupts Until STC bit is set No Call FM_TUNE_STATUS With INTACK bit set (command 0x22) Use GPO? Yes Set GPO (command 0x80, 0x81) No CHIP STATE: RECEIVING FM Set RCLK settings (property 0x0201, 0x0202) Digital output mode? (Si4706/41/43/45 only) Yes Set audio format (property 0x0102) No Clock must be available on DCLK/DFS pin Enable digital audio by setting DFS sample rate (property 0x0104) LPI pin for embedded (short) Which pin is used antenna Set FM_ANTENNA_INPUT For the antenna? (property 0x1107 = 1) (Si4706 only) FMI pin for headphone (long) antenna Set FM_ANTENNA_INPUT (property 0x1107 = 0) Rev. 0.7 271 AN332 S e t D e e m p h a s is ( p r o p e r ty 0 x 1 1 0 0 ) S e t M o n o /S te r e o B le n d s e tt in g s ( p r o p e r ty 0 x 1 8 0 0 – 0 x 1 8 0 B ) S e t S o ft M u t e S e tt in g s (p r o p e r ty 0 x 1 3 0 1 – 0 x 1 3 0 3 ) N o t a p p lic a b le to S i4 7 4 9 S e t V o lu m e ( p r o p e r ty 0 x 4 0 0 0 ) S e t M u te /U n m u te ( p r o p e r ty 0 x 4 0 0 1 ) S e t M a x T u n e E rro r ( p r o p e r ty 0 x 1 1 0 8 ) S e t F M T u n e F re q u e n c y (c o m m a n d 0 x 2 0 ) U s e G E T _ IN T _ S T A T U S (c o m m a n d 0 x 1 4 ) o r h a r d w a r e in te r r u p t s U n til S T C b it is s e t C a ll F M _ T U N E _ S T A T U S W ith I N T A C K b it s e t (c o m m a n d 0 x 2 2 ) C H IP S T A T E : R E C E IV IN G F M Q u e ry F M _ T U N E _ S T A T U S (c o m m a n d 0 x 2 2 ) 272 Rev. 0.7 AN332 Receive RDS? (Si4706/41/43/45/49 only) Yes Set RDS_INT_SOURCE (property 0x1500) No Disable RDS in RDS_CONFIG (property 0x1502) SetRDS_INT_FIFO_COUNT (property 0x1501) Set RDS_CONFIG & enable RDS (property 0x1502) Received RDS Interrupt or poll RDSINT from GET_INT_STATUS Read RDS data with FM_RDS_STATUS (command 0x24) LOOP until RDS FIFO is empty Process RDS data on the host Rev. 0.7 273 AN332 M o n ito r R e c e iv e d S ig n a l Q u a lity (R S Q ) ? Yes S e t R S Q s e ttin g s ( p ro p e rty 0 x 1 2 0 0 - 0 x 1 2 0 7 ) No Q u e ry F M _ R S Q _ S T A T U S (c o m m a n d 0 x 2 3 ) O p tio n a l: D o s o m e th in g based on FM _R SQ _STATU S S E E K next V a lid c h a n n e l? Yes S e t S E E K s e ttin g s ( p ro p e r ty 0 x 1 4 0 0 -1 4 0 4 ) No Send FM _SEEK_STAR T (c o m m a n d 0 x 2 1 ) C H IP S T A T E : R E C E IV IN G F M SC AN FM Band F o r v a lid c h a n n e ls ? Yes S e t S E E K s e ttin g s (p r o p e rty 0 x 1 4 0 0 - 1 4 0 4 ) No Send FM _S EEK _STAR T (c o m m a n d 0 x 2 1 ) U s e G E T _ IN T _ S T A T U S (c o m m a n d 0 x 1 4 ) o r h a r d w a r e in te r ru p ts u n til S T C b it is s e t C a ll F M _ T U N E _ S T A T U S w ith IN T A C K b it s e t (c o m m a n d 0 x 2 2 ) S to re v a lid c h a n n e ls In th e H o s t C H IP S T A T E : R E C E IV IN G F M 274 Rev. 0.7 L O O P u n til r e a c h e s end of FM band or b a c k to th e o rig in a l Channel AN332 Need to change DCLK/DFS Rate? (digital only) Yes Disable digital audio by setting DFS sample rate to 0 (property 0x0104) No Change DCLK/DFS rate or Disable DCLK/DFS DCLK/DFS has been changed or re-enabled Enable digital audio by setting DFS sample rate (property 0x0104) Change Chip Function to AM/SW/LW/WB Receive (Si4740/41/42/ 43/44/45) ? Yes Send POWER_DOWN (command 0x11) No CHIP STATE: POWER DOWN Repeat any of the instructions above after POWER_UP state To change settings No RECEIVE FM DONE? Yes Send POWER_UP For FM Transmit or AM/SW/ LW Receive or WB Receive (command 0x01) Send POWER_DOWN (command 0x11) CHIP STATE: POWER DOWN CHIP STATE: POWER UP (FM Transmit or AM/SW/LW Receive or WB Receive) Go back to the very first POWER DOWN state to POWER UP the chip in FM Receive Look at FM Transmit Or AM/SW/LW Receive Or WB Receive Flowchart Rev. 0.7 275 AN332 Table 55 provides an example for the FM/RDS Receiver. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response (RESP). For SET_PROPERTY commands, the property (PROP) and property data (PROPD) are indicated. The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. In some cases the default properties may be acceptable and no modification is necessary. Refer to “5. Commands and Properties” for a full description of each command and property. Table 55. Programming Example for the FM/RDS Receiver Action Data Description Powerup in Digital Mode CMD ARG1 ARG2 STATUS 0x01 0xC0 0xB0 →0x80 POWER_UP Set to FM Receive. Enable interrupts. Set to Digital Audio Output Reply Status. Clear-to-send high. Action: Ensure that DCLK and DFS are already supplied CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x01 0x04 0xBB 0x80 →0x80 0x12 0x00 0x01 0x02 0x00 0x00 →0x80 SET_PROPERTY DIGITAL_OUTPUT_SAMPLE_RATE Sample rate = 48000Hz = 0xBB80 Reply Status. Clear-to-send high. SET_PROPERTY DIGITAL_OUTPUT_FORMAT Mode: I2S, stereo, 16bit, sample on rising edge of DCLK. Reply Status. Clear-to-send high. Action: Go to Configuration (bypass “Powerup in analog mode” section). The rest of the programming is the same as analog. Powerup in Analog Mode CMD ARG1 ARG2 STATUS 0x01 0xC0 0x05 →0x80 POWER_UP Set to FM Receive. Enable interrupts. Set to Analog Audio Output Reply Status. Clear-to-send high. 0x10 0x80 0x1F 0x32 0x30 0x85 0xC5 0x32 0x30 0x42 GET_REV Reply Status. Clear-to-send high. Part Number, HEX (0x1F = 31 dec. = Si4731) Firmware Major Rev, ASCII (0x32 = 2) Firmware Minor Rev, ASCII (0x30 = 0) Patch ID MSB, example only Patch ID LSB, example only Component Firmware Major Rev, ASCII (0x32 = 2) Component Firmware Minor Rev, ASCII (0x30 = 0) Chip Rev, ASCII (0x42 = revB) Configuration CMD STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 276 Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x00 0x01 0x00 0xC9 0x80 0x12 0x00 0x02 0x01 0x7E 0xF4 0x80 0x12 0x00 0x02 0x02 0x01 0x90 0x80 0x12 0x00 0x40 0x00 0x00 0x3F 0x80 0x12 0x00 0x11 0x00 0x00 0x01 0x80 0x12 0x00 0x40 0x01 0x00 0x00 0x80 Description SET_PROPERTY GPO_IEN Set STCIEN, ERRIEN, CTSIEN, RSQIEN Reply Status. Clear-to-send high. SET_PROPERTY REFCLK_FREQ REFCLK = 32500 Hz Reply Status. Clear-to-send high. SET_PROPERTY REFCLK_PRESCALE Divide by 400 (example RCLK = 13 MHz, REFCLK = 32500 Hz) Reply Status. Clear-to-send high. SET_PROPERTY RX_VOLUME Output Volume = 63 Reply Status. Clear-to-send high. SET_PROPERTY FM_DEEMPHASIS 50 µs Reply Status. Clear-to-send high. SET_PROPERTY RX_HARD_MUTE Enable L and R audio outputs Reply Status. Clear-to-send high. Rev. 0.7 277 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 278 Data 0x12 0x00 0x18 0x00 0x00 0x31 0x80 0x12 0x00 0x18 0x01 0x00 0x1E 0x80 0x12 0x00 0x11 0x08 0x00 0x28 0x80 0x12 0x00 0x12 0x00 0x00 0x8F 0x80 0x12 0x00 0x12 0x01 0x00 0x1E 0x80 0x12 0x00 0x12 0x02 0x00 0x06 0x80 Description SET_PROPERTY FM_BLEND_RSSI_STEREO_THRESHOLD Threshold = 49dBµV = 0x0031 Reply Status. Clear-to-send high. SET_PROPERTY FM_BLEND_RSSI_MONO_THRESHOLD Threshold = 30 dBµV = 0x001E Reply Status. Clear-to-send high. SET_PROPERTY FM_MAX_TUNE_ERROR Threshold = 40 kHz = 0x0028 Reply Status. Clear-to-send high. SET_PROPERTY FM_RSQ_INT_SOURCE Enable blend, SNR high, SNR low, RSSI high and RSSI low interrupts. Reply Status. Clear-to-send high. SET_PROPERTY FM_RSQ_SNR_HI_THRESHOLD Threshold = 30 dB = 0x001E Reply Status. Clear-to-send high.Clear-to-send high. SET_PROPERTY FM_RSQ_SNR_LO_THRESHOLD Threshold = 6 dB = 0x0006 Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS Data 0x12 0x00 0x12 0x03 0x00 0x32 0x80 0x12 0x00 0x12 0x04 0x00 0x18 0x80 0x12 0x00 0x12 0x07 0x00 0xB2 0x80 0x12 0x00 0x13 0x02 0x00 0x0A 0x80 0x12 0x00 0x13 0x03 0x00 0x06 0x80 0x12 0x00 0x14 0x00 0x22 0x6A 0x80 Description SET_PROPERTY FM_RSQ_RSSI_HI_THRESHOLD Threshold = 50 dBµV = 0x0032 Reply Status. Clear-to-send high. SET_PROPERTY FM_RSQ_RSSI_LO_THRESHOLD Threshold = 24 dBµV = 0x0018 Reply Status. Clear-to-send high. SET_PROPERTY FM_RSQ_BLEND_THRESHOLD Pilot = 1, Threshold = 50% = 0x0032 Reply Status. Clear-to-send high. SET_PROPERTY FM_SOFT_MUTE_MAX_ATTENUATION Attenuation = 10 dB = 0x000A Reply Status. Clear-to-send high. SET_PROPERTY FM_SOFT_MUTE_SNR_THRESHOLD Threshold = 6 dB = 0x0006 Reply Status. Clear-to-send high. SET_PROPERTY FM_SEEK_BAND_BOTTOM Bottom Freq = 88.1 MHz = 0x226A Reply Status. Clear-to-send high. Rev. 0.7 279 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 ARG3 ARG4 STATUS CMD STATUS CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 280 Data 0x12 0x00 0x14 0x01 0x2A 0x26 0x80 0x12 0x00 0x14 0x02 0x00 0x14 0x80 0x12 0x00 0x14 0x03 0x00 0x06 0x80 0x12 0x00 0x14 0x04 0x00 0x14 0x80 0x20 0x00 0x27 0xF6 0x00 0x80 0x14 0x81 0x22 0x01 0x80 0x01 0x27 0xF6 0x2D 0x33 0x00 0x00 Description SET_PROPERTY FM_SEEK_BAND_TOP Top Freq = 107.9 MHz = 0x2A26 Reply Status. Clear-to-send high. SET_PROPERTY FM_SEEK_FREQ_SPACING Freq Spacing = 200 kHz = 0x0014 Reply Status. Clear-to-send high. SET_PROPERTY FM_SEEK_TUNE_SNR_THRESHOLD Threshold = 6 dB = 0x0006 Reply Status. Clear-to-send high. SET_PROPERTY FM_SEEK_TUNE_RSSI_THRESHOLD Threshold = 20 dBµV = 0x0014 Reply Status. Clear-to-send high. FM_TUNE_FREQ Set frequency to 102.3 MHz = 0x27F6 Set antenna tuning capacitor to auto. Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. FM_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Valid Frequency. Frequency = 0x27F6 = 102.3 MHz RSSI = 45 dBµV SNR = 51 dB Antenna tuning capacitor = 0 (range = 0–191) Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD 0x23 ARG1 0x01 0x80 STATUS 0x00 RESP1 0x01 RESP2 0xD9 RESP3 0x2D RESP4 0x33 RESP5 0x00 RESP6 0x00 RESP7 CMD 0x21 ARG1 0x0C 0x80 STATUS CMD 0x14 0x81 STATUS CMD 0x22 ARG1 0x01 0x80 STATUS 0x01 RESP1 0x28 RESP2 0x6E RESP3 0x22 RESP4 0x2C RESP5 0x00 RESP6 0x00 RESP7 RDS (Si4706/41/43/45/49 Only) CMD ARG1 ARG2(PROP) ARG3(PROP) ARG4(PROPD) ARG5(PROPD) STATUS CMD ARG1 ARG2(PROP) ARG3(PROP) ARG4(PROPD) ARG5(PROPD) STATUS 0x12 0x00 0x15 0x00 0x00 0x01 →0x80 0x12 0x00 0x15 0x01 0x00 0x04 →0x80 Description FM_RSQ_STATUS Clear RSQINT Reply Status. Clear-to-send high. No blend, SNR high, low, RSSI high or low interrupts. Soft mute is not engaged, no AFC rail, valid frequency. Pilot presence, 89% blend RSSI = 45 dBµV SNR = 51 dB Freq offset = 0 kHz FM_SEEK_START Seek Up and Wrap. Reply Status. Clear-to-send high. GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. FM_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Valid Frequency. Frequency = 0x286E = 103.5 MHz RSSI = 34 dBµV SNR = 44 dB Antenna tuning capacitor = 0 (range = 0–191) SET_PROPERTY RDS_INT_SOURCE Enable RDSRECV interrupt (set RDSINT bit when RDS has filled the FIFO by the amount set on FM_RDS_INTERRUPT_FIFO_COUNT Reply Status. Clear-to-send high SET_PROPERTY RDS_INT_FIFO_COUNT Set the minimum number of RDS groups stored in the RDS FIFO before RDSRECV is set Reply Status. Clear-to-send high Rev. 0.7 281 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 ARG2(PROP) ARG3(PROP) ARG4(PROPD) ARG5(PROPD) STATUS CMD STATUS 0x12 0x00 0x15 0x02 0xEF 0x01 →0x80 0x14 →0x84 CMD ARG1 STATUS 0x24 0x01 →0x84 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x17 →0x40 →0xA7 →0x20 →0x00 RESP8 RESP9 RESP10 RESP11 RESP12 →0x53 →0x49 →0x4C →0x49 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x16 →0x40 →0xA7 →0x00 →0x0C RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x53 →0x49 →0x00 282 Description SET_PROPERTY RDS_CONFIG Set Block Error A,B,C,D to 3,2,3,3 Enable RDS Reply Status. Clear-to-send high GET_INT_STATUS Reply Status. Clear-to-send high. RDSINT = 1 FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. RDS interrupt (RDSINT) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x17 = 23. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2000 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0000b = 0 (char 1,2,3,4) Block C: 0x5349 →SI Block D: 0x4C49 →LI BLE: 0 (No Error) Current RT: “SILI” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x16 = 22. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 00b = 0 (char 1,2) Block C (ignored) Block D: 0x5349 →SI BLE: 0 (No Error) Current PS: “SI” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x15 →0x40 →0xA7 →0x20 →0x01 RESP8 RESP9 RESP10 RESP11 RESP12 →0x43 →0x4F →0x4E →0x20 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x15 RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x00 →0x09 RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x4C →0x41 →0x00 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x15 = 21. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2001 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0001b = 1 (char 5,6,7,8) Block C: 0x434F →CO Block D: 0x4E20 →N BLE: 0 (No Error) Current RT: “SILICON” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x15 = 21 (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 01b = 1 (char 3,4) Block C (ignored) Block D: 0x4C41 →LA BLE: 0 (No Error) Current PS: “SILA” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 283 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x14 →0x40 →0xA7 →0x20 →0x02 RESP8 RESP9 RESP10 RESP11 RESP12 →0x4C →0x41 →0x42 →0x4F →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x14 RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x00 →0x0A RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x42 →0x53 →0x00 284 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x14 = 20. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2002 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0002b = 2 (char 9,10,11,12) Block C: 0x4C41 →LA Block D: 0x424F →BO BLE: 0 (No Error) Current RT: “SILICON LABO” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x14 = 20. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 10b = 2 (char 5,6) Block C (ignored) Block D: 0x4253 →BS BLE: 0 (No Error) Current PS: “SILABS” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x13 →0x40 →0xA7 →0x20 →0x03 RESP8 RESP9 RESP10 RESP11 RESP12 →0x52 →0x41 →0x54 →0x4F →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x13 RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x00 →0x0B RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x20 →0x20 →0x00 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x13 = 19. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2003 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0003b = 3 (char 13,14,15,16) Block C: 0x5241 →RA Block D: 0x544F →TO BLE: 0 (No Error) Current RT: “SILICON LABORATO” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x13 = 19. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 11b = 3 (char 7,8) Block C (ignored) Block D: 0x2020 →” “ BLE: 0 (No Error) Current PS: “SILABS” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 285 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x12 →0x40 →0xA7 →0x20 →0x04 RESP8 RESP9 RESP10 RESP11 RESP12 →0x52 →0x49 →0x45 →0x53 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x12 RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x00 →0x0C RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x52 →0x44 →0x00 286 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x12 = 18. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2004 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0004b = 4 (char 17,18,19,20) Block C: 0x5249 →RI Block D: 0x4553 →ES BLE: 0 (No Error) Current RT: “SILICON LABORATORIES” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x12 = 18. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 00b = 0 (char 1,2) Block C (ignored) Block D: 0x5244 →RD BLE: 0 (No Error) Current PS: “RDLABS Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x11 →0x40 →0xA7 →0x20 →0x05 RESP8 RESP9 RESP10 RESP11 RESP12 →0x20 →0x53 →0x49 →0x34 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x10 →0x40 →0xA7 →0x00 →0x09 RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x53 →0x20 →0x00 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x11 = 17. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2005 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0005b = 5 (char 21,22,23,24) Block C: 0x2053 → S Block D: 0x4934 →I4 BLE: 0 (No Error) Current RT: “SILICON LABORATORIES SI4” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x10 = 16. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 01b = 1 (char 3,4) Block C (ignored) Block D: 0x5320 →S BLE: 0 (No Error) Current PS: “RDS BS” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 287 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x0F →0x40 →0xA7 →0x20 →0x06 RESP8 RESP9 RESP10 RESP11 RESP12 →0x37 →0x31 →0x58 →0x20 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x0E →0x40 →0xA7 →0x00 →0x0A RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x44 →0x45 →0x00 288 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0F = 15. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2006 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0006b = 6 (char 25, 26, 27, 28) Block C: 0x3731 →71 Block D: 0x5820 →x BLE: 0 (No Error) Current RT: “SILICON LABORATORIES SI471x ” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0E = 14. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000A → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 10b = 2 (char 5, 6) Block C (ignored) Block D: 0x4445 →DE BLE: 0 (No Error) Current PS: “RDS DE” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x0E RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x20 →0x07 RESP8 RESP9 RESP10 RESP11 RESP12 →0x52 →0x44 →0x53 →0x20 →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x0D →0x40 →0xA7 →0x00 →0x0B RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x4D →0x4F →0x00 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0E = 14. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2007 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0007b = 7 (char 29,30,31,32) Block C: 0x5244 →RD Block D: 0x5320 →S BLE: 0 (No Error) Current RT: “SILICON LABORATORIES SI471x RDS” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0D = 13. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 11b = 3 (char 7,8) Block C (ignored) Block D: 0x4D4F →MO BLE: 0 (No Error) Current PS: “RDS DEMO” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 289 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 +STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x0D RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x20 →0x08 RESP8 RESP9 RESP10 RESP11 RESP12 →0x44 →0x45 →0x4D →0x4F →0x00 CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 →0x01 →0x01 →0x0C →0x40 →0xA7 →0x00 →0x0C RESP8 RESP9 RESP10 RESP11 RESP12 →0xE1 →0x02 →0x53 →0x49 →0x00 290 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0D = 13. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2008 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0008b = 8 (char 33,34,35,36) Block C: 0x4445 →DE Block D: 0x4D4F →MO BLE: 0 (No Error) Current RT: “SILICON LABORATORIES SI471x RDS DEMO” FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0C = 12. Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x000C → Group Type: 0A (Program Service PS) → PTY: 00000b (Undefined) → Address code: 00b = 0 (char 1,2) Block C (ignored) Block D: 0x5349 →SI BLE: 0 (No Error) Current PS: “SIS_DEMO” Complete Scrolling PS: “SILABS RDS DEMO” Rev. 0.7 AN332 Table 55. Programming Example for the FM/RDS Receiver (Continued) Action Data CMD ARG1 STATUS 0x24 0x01 →0x80 RESP1 RESP2 RESP3 →0x01 →0x01 →0x0D RESP4 RESP5 RESP6 RESP7 →0x40 →0xA7 →0x20 →0x09 RESP8 RESP9 RESP10 RESP11 RESP12 →0x0D →0x00 →0x00 →0x00 →0x00 CMD STATUS 0x11 0x80 Description FM_RDS_STATUS Clear RDS interrupt. Reply Status. Clear-to-send (CTS) high. Seek/Tune Complete (STCINT) high. Interrupt source: RDS received. RDS Synchronized. No lost data. RDS FIFO Used: 0x0C = 12. (FIFO receives another group while querying) Block A: 0x40A7 → PI Code: 0x40A7 (KSLB). Block B: 0x2009 → Group Type: 2A (Radio Text RT) → PTY: 00000b (Undefined) → Address code: 0009b = 9 (char 37,38,39,40) Block C: 0x0D00 → ‘RET’ ‘NUL’ (end of RT) Block D: 0x0000 → ‘NUL’ ‘NUL’ BLE: 0 (No Error) Current RT: “SILICON LABORATORIES SI471x RDS DEMO” - continue sending FM_RDS_STATUS until FIFO empty POWER_DOWN Reply Status. Clear-to-send high. The device sets the CTS bit (and optional interrupt) to indicate that it is ready to accept the next command. The CTS bit also indicates that the POWER_UP, GET_REV, POWER_DOWN, GET_PROPERTY, GET_INT_STATUS, FM_TUNE_STATUS, and FM_RSQ_STATUS commands have completed execution. When performing a FM_TUNE_FREQ or FM_SEEK_START CTS will indicate that the device is ready to accept the next command even though the operation is not complete. GET_INT_STATUS or hardware interrupts should be used to query for the STC bit to be set prior to performing other commands. Use FM_TUNE_STATUS to clear the STC bit after it has been set. Rev. 0.7 291 AN332 12.3. Programming Example for the AM/LW/SW Receiver The following flowchart shows an overview of how to program the AM/LW/SW receiver. RESET CHIP STATE: POWER DOWN Power Up With Patch? Yes Check Chip Library ID POWER_UP with FUNC=15 (command 0x01) No Library ID Compatible w/ patch? POWER UP with GPO2OEN bit enabled (command 0x01) Yes POWER_UP with Patch and GPO2OEN bits enabled (command 0x01) Send Patch Data (command 0x15, 0x16) CHIP STATE: POWER UP Check Chip/FW/Comp rev GET_REV (command 0x10) Chip/FW/Comp Rev are correct? No Contact Silabs For verification Yes 292 Rev. 0.7 No Contact Silabs For verification AN332 Use all default Settings? Set AM Tune Frequency (command 0x40) Yes No Use Interrupt? Yes Set INT settings (property 0x0001) Use GET_INT_STATUS (command 0x14) or hardware interrupts Until STC bit is set No Call AM_TUNE_STATUS With INTACK bit set (command 0x42) Use GPO? Yes Set GPO (command 0x80, 0x81) No CHIP STATE: RECEIVING AM / SW / LW Set RCLK settings (property 0x0201, 0x0202) Digital output mode? (Si4741/43/45 only) Yes Set DIGITAL output settings (property 0x0102, 0x0104) No Rev. 0.7 293 AN332 S e t A M _ D E E M P H A S IS (p ro p e rty 0 x 3 1 0 0 ) S e t A M _ C H A N N E L _ F IL T E R (p ro p e rty 0 x 3 1 0 2 ) S e t S o f t M u t e S e t t in g s (p ro p e rty 0 x 3 3 0 1 - 3 3 0 3 ) S e t V o lu m e (p ro p e rty 0 x 4 0 0 0 ) S e t M u te / U n m u t e (p ro p e rty 0 x 4 0 0 1 ) S e t A M T u n e F re q u e n c y (c o m m a n d 0 x 4 0 ) U s e G E T _ IN T _ S T A T U S (c o m m a n d 0 x 1 4 ) o r h a r d w a r e in t e r r u p t s U n t il S T C b it is s e t C a ll A M _ T U N E _ S T A T U S W it h I N T A C K b it s e t (c o m m a n d 0 x 4 2 ) C H IP S T A T E : R E C E IV IN G A M / S W / L W Q u e ry A M _ T U N E _ S T A T U S (c o m m a n d 0 x 4 2 ) 294 Rev. 0.7 AN332 Monitor Received Signal Quality (RSQ)? Yes Set RSQ settings (property 0x3200 - 0x3204) No Query AM_RSQ_STATUS (command 0x43) Optional: Do something based on AM_RSQ_STATUS SEEK next Valid channel? Yes Set SEEK settings (property 0x3400-3404) No SEND AM_SEEK_START (COMMAND 0X41) CHIP STATE: RECEIVING AM / SW / LW SCAN AM/SW/LW Band For valid channels? Yes Set SEEK settings (property 0x3400-3404) No Send AM_SEEK_START (command 0X41) Use GET_INT_STATUS (command 0x14) or hardware interrupts until STC bit is set LOOP until reaches end of AM band or back to the original channel Call AM_TUNE_STATUS With INTACK bit set (command 0x42) Store valid channels In the Host CHIP STATE: RECEIVING AM / SW / LW Rev. 0.7 295 AN332 Change Chip Function To FM Receive or Weather Band? Yes No Repeat any of the instructions above after POWER_UP state To change settings No RECEIVE AM / SW / LW DONE? Yes Send POWER_DOWN (command 0x11) Send POWER_DOWN (command 0x11) CHIP STATE: POWER DOWN CHIP STATE: POWER DOWN Go back to the very first POWER DOWN state to POWER UP the chip in AM / SW / LW Receive Send POWER_UP For FM Receive or Weather Band (command 0x01) CHIP STATE: POWER UP (FM Receive or Weather Band) Look at FM Receive or Weather Band Flowchart 296 Rev. 0.7 AN332 Table 56 provides an example of programming the AM/LW/SW receiver. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response (RESP). For SET_PROPERTY commands, the property (PROP) and property data (PROPD) are indicated. The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. Note that in some cases the default properties may be acceptable and no modification is necessary. Refer to Section “5. Commands and Properties” for a full description of each command and property. Table 56. Programming Example for the AM/LW/SW Receiver Action Data Description Powerup in Digital Mode CMD ARG1 ARG2 STATUS 0x01 0xC1 0xB0 →0x80 CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x01 0x04 0xBB 0x80 →0x80 0x12 0x00 0x01 0x02 0x00 0x00 →0x80 POWER_UP Set to AM/LW/SW Receive. Enable interrupts. Set to Digital Audio Output Reply Status. Clear-to-send high. Action: Ensure that DCLK and DFS are already supplied SET_PROPERTY DIGITAL_OUTPUT_SAMPLE_RATE Sample rate = 48000 Hz = 0xBB80 Reply Status. Clear-to-send high. SET_PROPERTY DIGITAL_OUTPUT_FORMAT Mode: I2S, stereo, 16bit, sample on rising edge of DCLK. Reply Status. Clear-to-send high. Action: Go to Configuration (bypass “Powerup in analog mode” section). The rest of the programming is the same as analog. Powerup in Analog Mode CMD ARG1 ARG2 STATUS 0x01 0xC1 0x05 →0x80 POWER_UP Set to AM/LW/SW Receive. Enable interrupts. Set to Analog Audio Output Reply Status. Clear-to-send high. Configuration Rev. 0.7 297 AN332 Table 56. Programming Example for the AM/LW/SW Receiver (Continued) Action Data Description CMD STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 0x10 0x80 0x1F 0x32 0x30 0x85 0xC5 0x32 0x30 0x42 GET_REV Reply Status. Clear-to-send high. Part Number, HEX (0x1F = 31 dec. = Si4731) Firmware Major Rev, ASCII (0x32 = 2) Firmware Minor Rev, ASCII (0x30 = 0) Patch ID MSB, example only Patch ID LSB, example only Component Firmware Major Rev, ASCII (0x32 = 2) Component Firmware Minor Rev, ASCII (0x30 = 0) Chip Rev, ASCII (0x42 = revB) CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x00 0x01 0x00 0xC1 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x02 0x01 0x7E 0xF4 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x02 0x02 0x01 0x90 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x40 0x00 0x00 0x3F 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x31 0x02 0x00 0x01 0x80 SET_PROPERTY 298 GPO_IEN Set STCIEN, ERRIEN, CTSIEN Reply Status. Clear-to-send high. REFCLK_FREQ REFCLK = 32500 Hz Reply Status. Clear-to-send high. REFCLK_PRESCALE Divide by 400 (example RCLK = 13 MHz, REFCLK = 32500 Hz) Reply Status. Clear-to-send high. RX_VOLUME Output Volume = 63 Reply Status. Clear-to-send high. AM_CHANNEL_FILTER 4 kHz Bandwidth = 0x01 Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 56. Programming Example for the AM/LW/SW Receiver (Continued) Action Data Description CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x31 0x00 0x00 0x01 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x32 0x00 0x00 0x08 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x32 0x01 0x00 0x0A 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x32 0x02 0x00 0x0A 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x32 0x03 0x00 0x1E 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x32 0x04 0x00 0x0A 0x80 SET_PROPERTY AM_DEEMPHASIS 50 µs Reply Status. Clear-to-send high. AM_RSQ_INTERRUPTS Interrupt when SNR higher than RSQ SNR threshold Reply Status. Clear-to-send high. AM_RSQ_SNR_HIGH_THRESHOLD 10 dB = 0x0A Reply Status. Clear-to-send high. AM_RSQ_SNR_LOW_THRESHOLD 10 dB = 0x0A Reply Status. Clear-to-send high. AM_RSQ_RSSI_HIGH_THRESHOLD 30 dBµV = 0x1E Reply Status. Clear-to-send high. AM_RSQ_RSSI_LOW_THRESHOLD 10 dBµV = 0x0A Reply Status. Clear-to-send high. Rev. 0.7 299 AN332 Table 56. Programming Example for the AM/LW/SW Receiver (Continued) Action Data Description CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x33 0x02 0x00 0x0A 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x33 0x03 0x00 0x09 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x34 0x00 0x02 0x08 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x34 0x01 0x06 0xAE 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x34 0x02 0x00 0x0A 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x34 0x03 0x00 0x0B 0x80 SET_PROPERTY 300 AM_SOFT_MUTE_MAX_ATTENUATION 10 dB attenuation = 0x0A Reply Status. Clear-to-send high. AM_SOFT_MUTE_SNR_THRESHOLD 9 dB = 0x09 Reply Status. Clear-to-send high. AM_SEEK_BAND_BOTTOM 520 kHz = 0x0208 Reply Status. Clear-to-send high. AM_SEEK_BAND_TOP 1710 kHz = 0x06AE Reply Status. Clear-to-send high. AM_SEEK_FREQ_SPACING 10 kHz = 0x000A Reply Status. Clear-to-send high. AM_SEEK_SNR_THRESHOLD 0x000B = 11 dB Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 56. Programming Example for the AM/LW/SW Receiver (Continued) Action Data Description CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x34 0x04 0x00 0x2A 0x80 CMD ARG1 ARG2 ARG3 ARG4 ARG5 STATUS 0x40 0x00 0x03 0xE8 0x00 0x00 0x80 CMD STATUS 0x14 0x81 GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. CMD ARG1 STATUS 0x41 0x0C 0x80 AM_SEEK_START Seek up and wrap at band boundary Reply Status. Clear-to-send high. CMD STATUS 0x14 0x81 GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. CMD ARG1 STATUS RESP1 0x42 0x01 0x80 0x01 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 0x03 0xE8 0x2A 0x1A 0x0D 0x95 AM_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Channel is valid, AFC is not railed, and seek did not wrap at AM band boundary Frequency = 0x03E8 = 1000 kHz CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 0x43 0x01 0x80 0x00 0x01 0x00 0x2A 0x1A AM_RSQ_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. No SNR high, low, RSSI high, or low interrupts. Channel is valid, soft mute is not activated, and AFC is not railed CMD STATUS 0x11 0x80 POWER_DOWN Reply Status. Clear-to-send high. SET_PROPERTY AM_SEEK_RSSI_THRESHOLD 0x002A = 42 dBµV Reply Status. Clear-to-send high. AM_TUNE_FREQ Set frequency to 1000 kHz = 0x03E8 Automatically select tuning capacitor Reply Status. Clear-to-send high. RSSI = 0x2A = 42d = 42 dBµV SNR = 0x1A = 26d = 26 dB Value the antenna tuning capacitor is set to. 0x0D95 = 3477 dec. RSSI = 0x2A = 42d = 42 dBµV SNR = 0x1A = 26d = 26 dB Rev. 0.7 301 AN332 The device sets the CTS bit (and optional interrupt) to indicate that it is ready to accept the next command. The CTS bit also indicates that the POWER_UP, GET_REV, POWER_DOWN, GET_PROPERTY, GET_INT_STATUS, AM_TUNE_STATUS, and AM_RSQ_STATUS commands have completed execution. When performing a AM_TUNE_FREQ or AM_SEEK_START CTS will indicate that the device is ready to accept the next command even though the operation is not complete. GET_INT_STATUS or hardware interrupts should be used to query for the STC bit to be set prior to performing other commands. Use AM_TUNE_STATUS to clear the STC bit after it has been set. 12.4. Programming Example for the WB/SAME Receiver The following flowchart is an overview of how to program the WB (Weather Band) Receiver. RESET CHIP STATE: POWER DOWN Power Up With Patch? Yes Check Chip Library ID POWER_UP with FUNC=15 (command 0x01) No Library ID Compatible w/ patch? POWER UP with GPO2OEN bit enabled (command 0x01) Yes POWER_UP with Patch and GPO2OEN bits enabled (command 0x01) Send Patch Data (command 0x15, 0x16) CHIP STATE: POWER UP Check Chip/FW/Comp rev GET_REV (command 0x10) Chip/FW/Comp Rev are correct? No Contact Silabs For verification Yes 302 Rev. 0.7 No Contact Silabs For verification AN332 Use all default Settings? Set W B Tune Frequency (com m and 0x50) Yes No Use Interrupt? Yes Set INT settings (property 0x0001) Use GET_INT_STATUS (comm and 0x14) or hardware interrupts until STC bit is set No Call W B_TUNE_STATUS with INTACK bit set (com m and 0x52) Use GPO ? Yes Set GPO (com m and 0x80, 0x81) No CHIP STATE: RECEIVING W B Set RCLK settings (property 0x0201, 0x0202) Rev. 0.7 303 AN332 S e t W B M a x T u n e E rro r (p ro p e rty 0 x 5 1 0 8 ) S e t W B V a lid S N R T h r e s h o ld (p ro p e rty 0 x 5 4 0 3 ) S e t W B V a lid R S S I T h r e s h o ld (p ro p e rty 0 x 5 4 0 4 ) S e t V o lu m e (p ro p e rty 0 x 4 0 0 0 ) S e t M u te /U n m u te (p ro p e rty 0 x 4 0 0 1 ) S e t W B T u n e F re q u e n c y (c o m m a n d 0 x 5 0 ) U s e G E T _ IN T _ S T A T U S (c o m m a n d 0 x 1 4 ) o r h a r d w a r e in t e r r u p t s u n t il S T C b it is s e t C a ll W B _ T U N E _ S T A T U S w it h I N T A C K b it s e t (c o m m a n d 0 x 5 2 ) C H IP S T A T E : R E C E IV IN G W B Q u e ry W B _ T U N E _ S T A T U S (c o m m a n d 0 x 5 2 ) 304 Rev. 0.7 AN332 Monitor Received Signal Quality (RSQ)? Yes Set RSQ settings (property 0x5200 - 0x5204) No Query WB_RSQ_STATUS (command 0x53) Optional: Do something based on WB_RSQ_STATUS Monitor Alert Tone (ASQ)? Set ASQ int source (property 0x5600) Yes No Query WB_ASQ_STATUS (command 0x55) Optional: Do something based on WB_ASQ_STATUS Monitor SAME? Set SAME int source (property 0x5500) Yes No Query WB_SAME_STATUS (command 0x54) No Comlete Message Received? Yes Optional: Do something based on WB_SAME_STATUS Rev. 0.7 305 AN332 Change Chip Function To AM or FM? Yes Send POWER_DOWN (command 0x11) No CHIP STATE: POWER DOWN Repeat any of the instructions above after POWER_UP state To change settings No RECEIVE WB DONE? Yes Send POWER_UP For AM or FM Receive (command 0x01) Send POWER_DOWN (command 0x11) CHIP STATE: POWER DOWN Go back to the very first POWER DOWN state to POWER UP the chip in WB Receive 306 Rev. 0.7 CHIP STATE: POWER UP (AM or FM Receive) Look at AM or FM Receive Flowchart AN332 For detailed information on SAME processing, please refer to the following flow chart: Start Call WB_SAME_STATUS INT_ACK = 1 Set GPO_IEN for SAME and ALERT Tone Interrupts = 0x06 Yes EOM_DET = 1? Configure SAME Interrupts for HDR_RDY, EOM_DET, and PRE_DET WB_SAME_INTERRUPT Source = 0x0B No Yes PRE_DET = 1? Tune to WB Channel WB_TUNE_FREQ No HDR_RDY = 1 at this point Disable Timer Set HDR_COUNT = 0 Increment HDR_COUNT Check Interrupt Status GET_INT_STATUS Message Length /8 Get Message and Process WB_SAME_STATUS SAME_INT Yes SAME_INT or ASQ_INT = 1? INT TYPE? No HDR_COUNT = 3? ASQ_INT No Yes No TIMER > 6 SEC? Reset Timer Yes Clear SAME buffer, Disable timer, and SET_HDR.COUNT = 0 Rev. 0.7 307 AN332 Table 57 provides an example for the WB Receiver. The table is broken into three columns. The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response (RESP). For SET_PROPERTY commands, the property (PROP) and property data (PROPD) are indicated. The second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the data indicates data being sent from the device to the system controller. The third column describes the action. Note that in some cases the default properties may be acceptable and no modification is necessary. Refer to Section “5. Commands and Properties” for a full description of each command and property. Table 57. Programming Example for the WB/SAME Receiver Action CMD ARG1 ARG2 STATUS Data 0x01 0xC3 0x05 →0x80 POWER_UP Set to weatherband receive. Enable interrupts. Set to Analog Out. Reply Status. Clear-to-send high. CMD STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 0x10 → 0x80 → 0x25 → 0x30 → 0x41 → 0x13 → 0x36 → 0x30 → 0x41 → 0x42 GET_REV Reply Status. Clear-to-send high. Part Number, HEX (0x25 = 37 dec. = Si4737) Firmware Major Rev, ASCII (0x30 = 0) Firmware Minor Rev, ASCII (0x41 = A) Patch ID MSB, example only Patch ID LSB, example only Component Firmware Major Rev, ASCII (0x30 = 0) Component Firmware Minor Rev, ASCII (0x41 = A) Chip Rev, ASCII (0x42 = revB) CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x00 0x01 0x00 0xC7 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x02 0x01 0x80 0x00 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x02 0x02 0x00 0x01 → 0x80 SET_PROPERTY 308 Description GPO_IEN Set STCIEN, ERRIEN, CTSIEN, ASQIEN, SAMEIEN Reply Status. Clear-to-send high. REFCLK_FREQ REFCLK = 32768 Hz Reply Status. Clear-to-send high. REFCLK_PRESCALE Divide by 1 Reply Status. Clear-to-send high. Rev. 0.7 AN332 Table 57. Programming Example for the WB/SAME Receiver (Continued) CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x40 0x00 0x00 0x3F → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x40 0x01 0x00 0x00 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x54 0x03 0x00 0x06 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x54 0x04 0x00 0x14 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x56 0x00 0x00 0x01 → 0x80 SET_PROPERTY CMD ARG1 ARG2 (PROP) ARG3 (PROP) ARG4 (PROPD) ARG5 (PROPD) STATUS 0x12 0x00 0x55 0x00 0x00 0x01 → 0x80 SET PROPERTY CMD ARG1 ARG2 ARG3 STATUS 0x50 0x00 0xFD 0xC0 → 0x80 WB_TUNE_FREQ RX_VOLUME Output Volume = 63 Reply Status. Clear-to-send high. RX_HARD_MUTE Enable L and R audio outputs Reply Status. Clear-to-send high. WB_VALID_SNR_THRESHOLD Threshold = 06 dB = 0x0006 Reply Status. Clear-to-send high. WB_VALID_RSSI_THRESHOLD Threshold = 20 dBµV = 0x0014 Reply Status. Clear-to-send high. WB_ASQ_INTERRUPT_SOURCE Interrupt when alert tone is present. Reply Status. Clear-to-send high. WB_SAME_INTERRUPT_SOURCE (Si4707 only) Interrupt when header is ready. Reply Status. Clear-to-send high. Set frequency to 162.4 MHz = 0xFDC0 Frequency is set in units of 2500 Hz. Reply Status. Clear-to-send high. Rev. 0.7 309 AN332 Table 57. Programming Example for the WB/SAME Receiver (Continued) CMD STATUS 0x14 → 0x81 GET_INT_STATUS Reply Status. Clear-to-send high. STCINT = 1. CMD ARG1 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 0x52 0x01 → 0x80 → 0x01 → 0xFD → 0xC0 → 0x22 → 0x17 WB_TUNE_STATUS Clear STC interrupt. Reply Status. Clear-to-send high. Valid Frequency. Frequency = 0xFDC0 = 162.4 MHz CMD ARG1 STATUS RESP1 0x55 0x01 → 0x80 → 0x02 WB_ASQ_STATUS RSSI = 34 dBµV SNR = 23 dB Reply Status. Clear-to-send high. Alert tone is not present. SAME (Si4707 Only) CMD STATUS 0x14 → 0x84 GET_INT_STATUS Reply Status. Clear-to-send high. SAMEINT = 1. CMD ARG1 ARG2 STATUS RESP1 RESP2 RESP3 RESP4 RESP5 RESP6 RESP7 RESP8 RESP9 RESP10 RESP11 RESP12 0x54 0x01 0x00 → 0x80 → 0x0F → 0x00 → 0xFE → 0xFF → 0x2D → 0x57 → 0x58 → 0x52 → 0x2D → 0x56 → 0x4F → 0x57 WB_SAME_STATUS Clear SAME interrupt. Begin reading message from byte 0. Reply Status. Clear-to-send high. Message flags set. State = End of message. Message length 254 bytes. Data confidence level = high. Data0 Data1 Data2 Data3 Data4 Data5 Data6 Data7 Note: This command should be called repeatedly with the readaddr[7:0] incremented by 8 each time until all 254 bytes (in this example) are returned. The buffer should then be cleared as described in the WB_SAME_STATUS:CLRBUF bit description. CMD STATUS 0x11 → 0x80 POWER_DOWN Reply Status. Clear-to-send high. The device sets the CTS bit (and optional interrupt) to indicate that it is ready to accept the next command. The CTS bit also indicates that the POWER_UP, GET_REV, POWER_DOWN, GET_PROPERTY, GET_INT_STATUS, WB_TUNE_STATUS, WB_ASQ_STATUS, and WB_RSQ_STATUS commands have completed execution. When performing a WB_TUNE_FREQ CTS will indicate that the device is ready to accept the next command even though the operation is not complete. GET_INT_STATUS or hardware interrupts should be used to query for the STC bit to be set prior to performing other commands. Use WB_TUNE_STATUS to clear the STC bit after it has been set. 310 Rev. 0.7 AN332 APPENDIX A—COMPARISON OF THE Si4704/05/3X-B20, Si4704/05/3X-C40, AND Si4704/05/3X-D60 This appendix describes the configuration, command, and property differences between silicon and firmware revisions of the Si4704/05/3x-B20, Si4704/05-3x-C40, and Si4704/05/3x-D60 devices. Each revision is referred to by its die revision and firmware revision suffix according to Table 1. For a more detailed configuration reference, consult “AN332: Si47xx Programming Guide”. Table 58. Die Revision and Firmware Revision Table Part Number Function Die Revision Firmware Revision Die Revision + Firmware Revision Suffix Si4704-B20-GM/GU FM Receiver B 20 -B20 Si4705-B20-GM/GU FM RDS Receiver B 20 -B20 Si4730-B20-GM/GU AM/FM Receiver B 20 -B20 Si4731-B20-GM/GU AM/FM RDS Receiver B 20 -B20 Si4734-B20-GM/GU AM/SW/FM Receiver B 20 -B20 Si4735-B20-GM/GU AM/SW/FM RDS Receiver B 20 -B20 Si4704-C40-GM/GU FM Receiver C 40 -C40 Si4705-C40-GM/GU FM RDS Receiver C 40 -C40 Si4730-C40-GM/GU AM/FM Receiver C 40 -C40 Si4731-C40-GM/GU AM/FM RDS Receiver C 40 -C40 Si4734-C40-GM/GU AM/SW/FM Receiver C 40 -C40 Si4735-C40-GM/GU AM/SW/FM RDS Receiver C 40 -C40 Si4704-D60-GM/GU FM Receiver with Advanced Audio processing D 60 -D60 Si4705-D60-GM/GU FM RDS Receiver with Advanced Audio processing D 60 -D60 Si4730-D60-GM/GU AM/FM Receiver with Advanced Audio processing D 60 -D60 Si4731-D60-GM/GU AM/FM RDS Receiver with Advanced Audio processing D 60 -D60 Si4734-D60-GM/GU AM/SW/FM Receiver with Advanced Audio processing D 60 -D60 Si4735-D60-GM/GU AM/SW/FM RDS Receiver with Advanced Audio processing D 60 -D60 Rev. 0.7 311 AN332 Each of the following subsections describes the differences between revisions for groups of properties and/or commands. Each property is listed as PROPERTY_NAME (number) = default (supported revisions). Hexadecimal values are immediately preceded by “0x”; all other numeric values are decimal. AM, FM, and WB errata on -B20 have been addressed in -C40 and/or -D60 devices. The -D60 is the most recent revision and offers advanced features not available in the -C40 and -B20 revisions. FM Properties And Commands The properties and commands in this section are related to FM mode. FM Mode Max Tune Error (0x110x Properties) FM_MODE_MAX_TUNE_ERROR (0x1108) = 30 (-B20), 20 (-C40, -D60) Maximum tune error in kHz is stored in property 0x1108. It has a default setting of 30 kHz in -B20, and a default setting of 20 kHz in -C40 and -D60. It should be noted that 20 kHz has been recommended for best performance even on -B20 devices through AN332. FM RSQ Interrupt Configuration (0x120x Properties) FM_RSQ_MULTIPATH_HIGH_THRESHOLD (0x1205 ) = 127 (-D60) FM_RSQ_MULTIPATH_LOW_THRESHOLD (0x1206 ) = 0 (-D60) Properties 0x1205 and 0x1206 are only available on -D60 parts. FM Soft Mute Configuration (0x130x Properties) FM_SOFT_MUTE_SLOPE (0x1301) = 2 (-C40, -D60) The target soft mute target attenuation - up to a set maximum attenuation level - is calculated as the difference between the soft mute threshold and the received SNR multiplied by a property value called the FM_SOFT_MUTE_SLOPE. In -C40 and -D60, the default slope is 2 dB/dB. In in -B20, the slope is not configurable through a property, but is also 2 dB/dB. Stereo Blend Thresholds (0x110x, 0x180x Properties) FM_BLEND_STEREO_THRESHOLD (0x1105) = 49 (-B20, -C40) FM_BLEND_MONO_THRESHOLD (0x1106) = 30 (-B20, -C40) FM_BLEND_RSSI_STEREO_THRESHOLD (0x1800) = 49 (-D60) FM_BLEND_RSSI_MONO_THRESHOLD (0x1801) = 30 (-D60) FM_BLEND_RSSI_ATTACK_RATE (0x1802) = 4000 (-D60) FM_BLEND_RSSI_RELEASE_RATE (0x1803) = 400 (-D60) FM_BLEND_SNR_STEREO_THRESHOLD (0x1804) = 27 (-D60) FM_BLEND_SNR_MONO_THRESHOLD (0x1805) = 14 (-D60) FM_BLEND_SNR_ATTACK_RATE (0x1806) = 4000 (-D60) FM_BLEND_SNR_RELEASE_RATE (0x1807) = 400 (-D60) FM_BLEND_MULTIPATH_STEREO_THRESHOLD (0x1808) = 20 (-D60) 312 Rev. 0.7 AN332 FM_BLEND_MULTIPATH_MONO_THRESHOLD (0x1809) = 60 (-D60) FM_BLEND_MULTIPATH_ATTACK_RATE (0x180A) = 4000 (-D60) FM_BLEND_MULTIPATH_RELEASE_RATE (0x180B) = 40 (-D60) In -B20 and -C40, FM stereo blend is only determined by RSSI based on blend thresholds set in 0x1105 and 0x1106. In -D60 devices, a series of advanced blend properties have been added to improve the user experience under dynamic signal conditions. To accommodate for this change, RSSI based threshold properties were relocated respectively to properties 0x1800 and 0x1801. 0x1800 and 0x1801 have the same default values as 0x1105 and 0x1106. Additional advanced blend features include stereo blending based on SNR and multipath thresholds. For each set of thresholds, separate blend attack (into mono) and release (into stereo) rates may be set. Each of the factors is independently evaluated, and any may trigger a blend into mono at its given threshold and rate. To remove any of the advanced blend factors from consideration; set the corresponding blend thresholds to min value of 0 for SNR based blend (0x1804/0x1805), and set the corresponding blend thresholds to max value of 100 for multipath based blend (0x1808/0x1809). FM Commands Some parameters and returned values are only applicable to -D60 parts. These are: multipath indicator returned by the FM_TUNE_STATUS command and the MULTIPATH_DETECT_HIGH and MULTIPATH_DETECT_LOW parameters of the FM_RSQ_STATUS command. In -C40 and -D60 devices, the RDSSYNC bit of the response to an FM_RDS_STATUS command may be incorrectly set. A patch is available only for -D60 devices. Rev. 0.7 313 AN332 AM Properties The properties and commands in this section are related to AM mode. AM Mode Configuration (0x310x Properties) AM_MODE_AVC_MAX_GAIN (0x3103) = 0x1543 (-C40, -D60) AM_MODE_AFC_SW_PULL_IN_RANGE (0x3104) = 8695 (-C40, -D60) AM_MODE_AFC_SW_LOCK_IN_RANGE (0x3105) = 11765 (-C40, -D60) AM_MODE_AVC_MAX_GAIN is available in -C40 and -D60 devices with a default max gain of 16 dB. In -B20, the AVC gain is set at maximum and not available through a property. To make -C40 or -D60 behave as -B20, set AM_MODE_MAX_GAIN to 0x7800. AM shortwave AFC range properties are available in -C40 and -D60 devices (supported by Si4734/35 devices only). The default values of these properties provide similar behavior to the behavior of -B20 devices. However, in -B20 devices, these properties are not available through the programming API. AM Soft Mute Configuration (0x330x Properties) AM_SOFT_MUTE_SLOPE (0x3301) = 2 (-B20), 1 (-C40, -D60) AM_SOFT_MUTE_MAX_ATTENUATION (0x3302) = 16 (-B20), 8 (-C40, -D60) AM_SOFT_MUTE_SNR_THRESHOLD (0x3303) = 10 (-B20), 8 (-C40, -D60) Settings for Audio Soft Mute Soft mute is active when SNR falls below the given AM_SOFT_MUTE_SNR_THRESHOLD. When active, the output audio will be decreased at a set rate until the target soft mute attenuation is achieved. In -B20 devices the threshold is 10 dB, whereas in -C40 and -D60 devices it is 8 dB. The target soft mute target attenuation - up to a set maximum attenuation level - is calculated as the difference between the soft mute threshold and the received SNR multiplied by a scalar value called the soft mute slope. The default value of this property is 1 dB/dB in -C40 and -D60. In -B20, the value used is 2 dB/dB. The maximum soft mute attenuation level is 10 dB in -B20. In -C40 and -D60 devices, the maximum level can be set by a property AM_SOFT_MUTE_MAXIMUM_ATTENUATION, which has a default value of 8 dB. The soft mute default changes in -C40 and -D60 have been made to improve weak signal listening experience. 314 Rev. 0.7 AN332 APPENDIX B—Si4704/05/3X-B20/-C40/-D60 COMPATIBILITY CHECKLIST This appendix describes the configuration differences between hardware revisions of Si4704/05/3x devices. It describes how to achieve backwards compatibility between systems designed for Si4704/05/3x-B20, -C40, and D60 device hardware revisions. It is not intended as a complete reference to Si4704/05/3x configuration. For an indepth configuration reference, consult “AN332: Si47xx Programming Guide”. In this appendix, each revision is referred to by its die revision and firmware revision suffix according to the following table. Table 59. Die Revision and Firmware Revision Table Part Number Function Die Revision Firmware Revision Die Revision + Firmware Revision Suffix Si4704-B20-GM/GU FM Receiver B 20 -B20 Si4705-B20-GM/GU FM RDS Receiver B 20 -B20 Si4730-B20-GM/GU AM/FM Receiver B 20 -B20 Si4731-B20-GM/GU AM/FM RDS Receiver B 20 -B20 Si4734-B20-GM/GU AM/SW/FM Receiver B 20 -B20 Si4735-B20-GM/GU AM/SW/FM RDS Receiver B 20 -B20 Si4704-C40-GM/GU FM Receiver C 40 -C40 Si4705-C40-GM/GU FM RDS Receiver C 40 -C40 Si4730-C40-GM/GU AM/FM Receiver C 40 -C40 Si4731-C40-GM/GU AM/FM RDS Receiver C 40 -C40 Si4734-C40-GM/GU AM/SW/FM Receiver C 40 -C40 Si4735-C40-GM/GU AM/SW/FM RDS Receiver C 40 -C40 Si4704-D60-GM/GU FM Receiver with Advanced Audio processing D 60 -D60 Si4705-D60-GM/GU FM RDS Receiver with Advanced Audio processing D 60 -D60 Si4730-D60-GM/GU AM/FM Receiver with Advanced Audio processing D 60 -D60 Si4731-D60-GM/GU AM/FM RDS Receiver with Advanced Audio processing D 60 -D60 Si4734-D60-GM/GU AM/SW/FM Receiver with Advanced Audio processing D 60 -D60 Si4735-D60-GM/GU AM/SW/FM RDS Receiver with Advanced Audio processing D 60 -D60 Hexadecimal values are immediately preceded by “0x”; all other numeric values are decimal. Rev. 0.7 315 AN332 To Achieve Similar Performance in SI4704/05/3X-D60 to SI4704/05/3X-C40 The -D60 devices have a more advanced feature set than -C40 devices. This section describes a step-by-step procedure to achieve similar performance from -D60 devices to that of -C40 devices by modifying or disabling some of the advanced features. FM Receiver Mode  There is a debug feature that remains active in Si4704/05/3x-D60 firmware which can create periodic noise in audio. Silicon Labs recommends you disable this feature by sending the following bytes (shown here in hexadecimal form): 0x12 0x00 0xFF 0x00 0x00 0x00     In Si4704/05/3x-D60 devices, the FM_BLEND_RSSI_STEREO_THRESHOLD property is no longer at address 0x1105. Use address 0x1800 instead. In Si4704/05/3x-D60 devices, the FM_BLEND_RSSI_MONO_THRESHOLD property is no longer at address 0x1106. Use address 0x1801 instead. To disable the SNR-based stereo blend, set both the FM_BLEND_SNR_STEREO_THRESHOLD property (0x1804) and the FM_BLEND_SNR_MONO_THRESHOLD property (0x1805) to 0. To disable the multipath-based stereo blend, set both the FM_BLEND_MULTIPATH_STEREO_THRESHOLD property (0x1808) and the FM_BLEND_MULTIPATH_MONO_THRESHOLD property (0x1809) to 100 (0x64). AM Receive Mode Si473x-D60 devices are compatible with Si473x-C40 devices in AMRX mode. WB Receive Mode There are no Si473x-D60 devices which support WBRX mode. To Achieve Similar Performance in SI4704/05/3X-D60 to SI4704/05/3X-B20 The -D60 devices have a more advanced feature set than -B20 devices. This section describes a step-by-step procedure to achieve similar performance from -D60 devices to that of -B20 devices by modifying or disabling some of the advanced features. FM Receiver Mode  There is a debug feature that remains active in Si4704/05/3x-D60 firmware which can create periodic noise in audio. Silicon Labs recommends you disable this feature by sending the following bytes (shown here in hexadecimal form): 0x12 0x00 0xFF 0x00 0x00 0x00     In Si4704/05/3X-D60 devices, the FM_BLEND_RSSI_STEREO_THRESHOLD property is no longer at address 0x1105. Use address 0x1800 instead. In Si4704/05/3X-D60 devices, the FM_BLEND_RSSI_MONO_THRESHOLD property is no longer at address 0x1106. Use address 0x1801 instead. To disable the SNR-based stereo blend, set both the FM_BLEND_SNR_STEREO_THRESHOLD property (0x1804) and the FM_BLEND_SNR_MONO_THRESHOLD property (0x1805) to 0. To disable the multipath-based stereo blend, set both the FM_BLEND_MULTIPATH_STEREO_THRESHOLD property (0x1808) and the FM_BLEND_MULTIPATH_MONO_THRESHOLD property (0x1809) to 100 (0x64). 316 Rev. 0.7 AN332 AM Receive Mode     Set the AM_MODE_AVC_MAX_GAIN property (0x3103) to 0x7800. Set the AM_SOFT_MUTE_THRESHOLD property (03303) to 10. Set the AM_SOFT_MUTE_SLOPE property (0x3301) to 2 Set the AM_SOFT_MUTE_MAX_ATTENUATION property (0x3302) to 16. WB Receive Mode There are no Si473x-D60 devices which support WBRX mode. To Achieve Similar Performance in Si4704/05/3X-C40 to Si4704/05/3X-B20 This section describes a step-by-step procedure to achieve performance from -C40 devices that is similar to that of -B20 devices. FM Receiver Mode Si473x-C40 devices are compatible with Si473x-B20 devices in FMRX mode. AM Receive Mode     Set the AM_MODE_AVC_MAX_GAIN property (0x3103) to 0x7800 (maximum). Set the AM_SOFT_MUTE_THRESHOLD property (0x3303) to 10 (db). Set the AM_SOFT_MUTE_SLOPE property (0x3301) to 2 (dB/dB). Set the AM_SOFT_MUTE_MAX_ATTENUATION property (0x3302) to 16 (dB). WB Receive Mode Si473x-C40 devices are compatible with Si473x-B20 devices in WBRX mode. Rev. 0.7 317 AN332 DOCUMENT CHANGE LIST Revision 0.1 to Revision 0.2         Updated Product Matrix in Table 1. Added Si4706 FM and High-Performance RDS Receiver support. Added Si4707 WB/SAME Receiver support. Added Si4740/41 multipath, blend, and AGC properties. Added Si4749 High-Performance RDS Receiver support. Updated Firmware, Library, and Component Compatibility tables. Added Command Timing Parameters for the WB Receiver. Updated FM Transmitter maximum audio volume recommendations. Revision 0.2 to Revision 0.3    Added notes to AM/SW/LW Receiver Reference Clock section. Removed Si4706/07/4x–related material. Updated product matrix in Table 1. Revision 0.3 to Revision 0.4     Added Si4704/05/30/31/34/35/36/37/38/39-C40 receiver support and additional AM properties. Added Si4784/85-B20 receiver support. Updated product matrix in Table 1. Updated with corrections to couple commands and properties. Revision 0.4 to Revision 0.41  Minor edits. Revision 0.41 to Revision 0.5   Combined information in AN332 Rev. 0.41 and AN344 Rev. 0.4 into AN332 Rev. 0.5. Added information for Si47xx-D50 and Si47xx-D60 parts. Revision 0.5 to Revision 0.6  Added Appendix A and Appendix B. Revision 0.6 to Revision 0.7  Added FM_BLEND_MAX_STEREO_SEPARATION property 318 Rev. 0.7 AN332 NOTES: Rev. 0.7 319 AN332 CONTACT INFORMATION 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: FMinfo@silabs.com Internet: www.silabs.com The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. 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Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. 320 Rev. 0.7