PI7C9X762BZHE

A product Line of Diodes Incorporated PI7C9X762 I2C-bus/SPI to UART Bridge Controller w/ 64 bytes of TX/RX FIFOs Features ÎÎDual channel full-duplex UART SPI interface ÎÎSupport I2C-bus or SPI interface ÎÎPI7C9X762 supports 33 Mbit/s maximum SPI clock speed ÎÎ64 bytes FIFO (transmitter and receiver) ÎÎSupport SPI mode 0 (slave mode only) ÎÎFully compatible with industrial standard 16C450 and equivalent Description ÎÎBaud Rates up to 16Mbit/s in 4X sampling clock rate The PI7C9X762 is a I2C-bus/SPI to a dual-channel high performance UART bridge controller. It offers data rates up to 33 Mbps and guarantees low operating and sleeping current. The PI7C9X762 also has up to 8 additional programmable general purpose I/O [GPIO] pins. The device comes in very small TSSOP28 packages, which makes it ideally suitable for cost efficient, handheld, battery operated applications. These UARTs provide a bridge for protocol conversion from I2C -bus or SPI to and RS-232/RS-485 and are fully bidirectional. ÎÎProgrammable character formatting àà 5-bit, 6-bit, 7-bit or 8-bit character àà Even, odd, or no parity àà 1, 1.5, or 2 stop bits ÎÎProgrammable Receive and Transmit FIFO trigger levels ÎÎSpecial character detection ÎÎInternal Loopback mode ÎÎLine break generation and detection The PI7C9X762 supports SPI clock speeds up to 33 Mbps and IrDA SIR up to 1.152 Mbit/s. Flow control ÎÎSupport hardware flow control using RTS/CTS PI7C9X762’s internal register set is backward-compatible with the widely used and widely popular 16C450 UART. The PI7C9X762 also provides additional advanced features such as auto hardware and software flow control, automatic RS-485 support, support for fractional baud rates and software reset. This allows the software to reset the UART at any moment, independent of the hardware reset signal. ÎÎSupport software flow control with programmable Xon/Xoff characters ÎÎProgrammable single or double Xon/Xoff characters Interface control ÎÎAutomatic RS-485 slave address detection ÎÎRS-485 driver direction control via RTS signal ÎÎRS-485 driver direction control inversion ÎÎBuilt-in IrDA encoder and decoder interface Application ÎÎSupports IrDA SIR with speeds up to 115.2 kbit/s ( optional ÎÎIndustrial computing 1.152Mbps) ÎÎAutomation ÎÎUp to eight user programmable GPIO pins ÎÎFactory process control ÎÎSoftware reset ÎÎMobile computing Others ÎÎEmbedded applications ÎÎLow standby current at 3.3 V ÎÎBattery operated devices ÎÎWide operation voltage (1.8V, 2.5V or 3.3V) ÎÎNetworking ÎÎIndustrial temperature ranges -40 ˚C to 85 ˚C ÎÎAvailable in TSSOP28 and TQFN32 Packages I2C interface ÎÎCompliant with I2C-bus fast speed ÎÎSupport slave mode only ÎÎCrystal oscillator (up to 24MHz) or external clock (up to 64MHz) input PI7C9X762 Document Number DS40306 Rev 4-2 1 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Block Diagram I2C-bus interface I2C-bus interface VDD VDD SC16IS750/760 SC16IS750/760 TX RX RTS CTS 16C450 COMPATIBLE REGISTER SETS RESET SCL SDL A0 A1 IRQ SCL SDL A0 A1 IRQ I2C-bus GPIO[3:0] VDD I2C/SPI XTAL1 XTAL2 SPI interface VDD GPIO4/DSR GPIO5/DTR GPIO6/CD GPIO7/RI GPIO REGISTER VDD I2C-bus 1KΩ(3.3 v) 1.5KΩ(2.5 v) 4 1KΩ(3.3 v) 1.5KΩ(2.5 v) 16C450 COMPATIBLE REGISTER SETS RESET VDD I2C/SPI XTAL1 VSS TX RX RTS CTS XTAL2 VSS 002aab971 002aab014 SPI interface VDD VDD SC16IS750/760 16C450 COMPATIBLE REGISTER SETS RESET SCLK CS SO SI IRQ SCLK CS SO SI IRQ 4 GPIO[3:0] GPIO REGISTER VDD I2C/SPI XTAL1 Document Number DS40306 Rev 4-2 XTAL2 VSS 16C450 COMPATIBLE REGISTER SETS RESET SPI 1KΩ(3.3 v) 1.5KΩ(2.5 v) PI7C9X762 SC16IS740 TX RX RTS CTS TX RX RTS CTS SPI 1KΩ(3.3 v) 1.5KΩ(2.5 v) GPIO4/DSR GPIO5/DTR GPIO6/CD GPIO7/RI VDD I2C/SPI XTAL1 002aab396 2 XTAL2 VSS www.diodes.com 002aab972 May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Pin Configuration GPIO6/CDA GPIO5/DTRA GPIO7/RIA VDD VSS CTSA RTSA terminal 1 index area TXA 32-Pin TQFN (SPI Interface) GPIO6/CDA GPIO5/DTRA GPIO7/RIA VDD VSS RTSA CTSA terminal 1 index area TXA 32-Pin TQFN (I2C-Bus Interface) 32 31 30 29 28 27 26 25 RXA 1 24 GPIO4/DSRA 23 RXB RESET 2 32 31 30 29 28 27 26 25 RXA 1 24 GPIO4/DSRA RESET 2 23 RXB XTAL1 3 22 TXB XTAL1 3 22 TXB XTAL2 4 21 VSS XTAL2 4 21 VSS 19 GPIO2/CDB 18 GPIO1/DTRB CS 7 SI 8 17 GPIO0/DSRB 9 10 11 12 13 14 15 16 RTSB CTSB IRQ VDD VSS SO SCLK RTSB CTSB IRQ VDD VSS SDA NC VSS SPI 6 19 GPIO2/CDB 18 GPIO1/DTRB A0 7 A1 8 17 GPIO0/DSRB 9 10 11 12 13 14 15 16 I2C 6 SCL 20 GPIO3/RIB VDD 5 20 GPIO3/RIB VDD 5 28-Pin TSSOP RTSA CTSA TXA RXA 1 2 3 4 RESET XTAL1 XTAL2 VDD 2 I C/SPI CS/A0 SI/A1 SO SCL/SCLK SDA PI7C9X762 28 GPIO7/RIA 27 GPIO6/CDA 26 25 GPIO5/DTRA GPIO4/DSRA 5 6 7 24 RXB TXB VSS 8 9 10 11 12 13 14 21 20 19 GPIO3/RIB 18 GPIO0/DSRB RTSB CTSB IRQ Document Number DS40306 Rev 4-2 23 22 17 16 15 GPIO2/CDB GPIO1/DTRB 3 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Pin Description Pin Name 28-TSSOP 32-TQFN Pin# Pin# Type Description I2C (SPI) INTERFACE CS/A0 CTSA 10 2 7 31 I SPI chip select or I2C-bus device address select A0. If SPI confguration is selected by I2C/SPI Chip select pin (Schmitt-trigger active LOW). If I2C-BUS configuration is selected by I2C/SPI pin, this pin along with A1 pin allows user to change the device's base address. To select the device address, please refer to table 9. I UART clear to send (active LOW), channel A. Alogic 0 (LOW) on the CTSA pin indicates the modem or data set is ready to accept transmit data from the PI7C9X762. Status can be tested by reading MSR(4). This pim only affects the transmit and receive operations when Auto-CTS function is enabled via the Enhanced Features Register EFR(7) for hardware flow control operation. CTSB 16 15 I UART clear to send (active LOW), channel B. Alogic 0 on the CTSB pin indicates the modem or data set is ready to accept transmit data from the PI7C9X762. Status can be tested by reading MSR(4). This pim only affects the transmit and receive operations when Auto-CTS function is enabled via the Enhanced Features Register EFR(7) for hardware flow control operation. I2C/SPI 9 6 I I2C-bus or SPI interface select. I2C-Bus interface is selected if this pin is at logic HIGH. SPI interface is selected if this pin is at logic LOW. O Interrupt (open-drain, active LOW). Interrupt is enabled when interrupt sources are enabled in the Interrupt Enable Register (IER). Interrupt conditions include: change of state of the input pins, receiver errors, available receiver buffer data, availble transmit buffer space, or when a modem status flag is detected. An extemal resistor (1 k-ohm for 3.3 V, 1.5 k-ohm for 2.5 V) must be connected between this pin and VDD. I SPI data input pin or I2C-bus device address select A1. If SPI configuration is selected by I2C/SPI pin, this is the SPI data input pin. If I2C-bus configuration is selected by I2C/SPI pin, this pin, this along with the A0 pin allows user to change the slave base address. To select the device address, p;ease refer to Table 9. IRQ SI/A1 15 11 14 8 SO 12 9 O SPI data output pin. If SPI configuration is selected by I2C/SPI pin, this is a 3-stateable output pin. If I2C-bus sonfiguration is selected by the I2C/SPI pin, this pin is undefined and must be left as not connected. SCL/SCLK 13 10 I I2C-bus or SPI input clock. 14 11 I/O I2C-bus data input/output, open-drain if I2C-bus configuration is selected by I2C/SPI pin. If SPI configuration is selected, this is not used and must be connected to VSS. GPIO0/DSRB 18 17 I/O Programmable I/O pin or modem DSRB GPIO1/DTRB 19 18 I/O Programmable I/O pin or modem DTRB GPIO2/CDB 20 19 I/O Programmable I/O pin or modem CDB GPIO3/RIB 21 20 I/O Programmable I/O pin or modem RIB GPIO4/DSRA 25 24 I/O Programmable I/O pin or modem DSRA GPIO5/DTRA 26 25 I/O Programmable I/O pin or modem DTRA SDA PI7C9X762 Document Number DS40306 Rev 4-2 4 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Pin Description Cont. Pin Name 28-TSSOP 32-TQFN Pin# Pin# Type Description GPIO6/CDA 27 26 I/O Programmable I/O pin or modem CDA GPIO7/RIA 28 27 I/O Programmable I/O pin or modem RIA RESET 5 2 I Hardware reset (active LOW) O UART request to send (active LOW). A logic 0 on the RTSA pin indicates the transmitter has data ready and waiting to send. Writing a logic 1 in the Modem Control Register MCR[1] will set this pin to a logic 0, indicating data is available. After a reset this pin set to a logic 1. This pin only affects the transmit and receive operations when Auto-RTS function is enabled via the Enhanced Feature Register (EFR[6]) for hardware flow control operation. RTSA 1 30 RTSB 17 16 O UART request to send (active LOW). A logic 0 on the RTSB pin indicates the transmitter has data ready and waiting to send. Writing a logic 1 in the Modem Control Register MCR[1] will set this pin to a logic 0, indicating data is available. After a reset this pin set to a logic 1. This pin only affects the transmit and receive operations when Auto-RTS function is enabled via the Enhanced Feature Register (EFR[6]) for hardware flow control operation. RXA 4 1 I Channel A receiver input. During the local Loopback mode, the RXA input pin is disabled and TXA data is connected to the UARTA RXA input internally. RXB 24 23 I Channel B receiver input. During the local Loopback mode, the RXB input pin is disabled and TXB data is connected to the UARTA RXB input internally. TXA 3 32 O Channel A transmitter output. During the local Loopback mode, the TXA input pin is disabled and TXA data is connected to the UARTA RXA input internally. TXB 23 22 O Channel B transmitter output. During the local Loopback mode, the TXB input pin is disabled and TXB data is connected to the UARTA RXB input internally. VDD 8 5, 13, 28 Power supply. VSS 22 12, 21, 29 Ground center pad The certer pad on the back side of the QFN32 package is metallic aand should be connected to ground on the printed-circuit board. VSS XTAL1 6 XTAL2 7 PI7C9X762 Document Number DS40306 Rev 4-2 3 I Crystal input or external clock input. A crystal can be connected between XTAL1 and XTAL2 to form an internal oscillator circuit (see Figure 11). Alternatively, an external clock can be connected to this pin. 4 O Crystal output. (See also XTAL1.) XTAL2 is used as a crystal oscillator output. 5 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Functional Description The UART will perform serial-to-I2C-bus conversion on data characters received from peripheral devices or modems, and I2C-busto-serial conversion on data characters transmitted by the host. The complete status of the UART can be read at any time during functional operation by the host. The UART can be placed in an alternate mode (FIFO mode) relieving the host of excessive software overhead by buffering received/ transmitted characters. Both the receiver and transmitter FIFOs can store up to 64 characters (including three additional bits of error status per character for the receiver FIFO) and have selectable or programmable trigger levels. The UART has selectable hardware flow control and software flow control. Hardware flow control significantly reduces software overhead and increases system efficiency by automatically controlling serial data flow using the RTS output and CTS input signals. Software flow control automatically controls data flow by using programmable Xon/Xoff characters. The UART includes a programmable baud rate generator that can divide the timing reference clock input by a divisor between 1 and (216 - 1). 1. Trigger levels The UART provides independently selectable and programmable trigger levels for both receiver and transmitter interrupt generation. After reset, both transmitter and receiver FIFOs are disabled and so, in effect, the trigger level is the default value of one character. The selectable trigger levels are available via the FIFO Control Register (FCR). The programmable trigger levels are available via the Trigger Level Register (TLR). If TLR bits are cleared, then selectable trigger level in FCR is used. If TLR bits are not cleared, then programmable trigger level in TLR is used. 2. Hardware flow control Hardware flow control is comprised of Auto-CTS and Auto-RTS (see Figure 1). Auto-CTS and Auto-RTS can be enabled/disabled independently by programming EFR[7:6]. With Auto-CTS, CTS must be active before the UART can transmit data. Auto-RTS only activates the RTS output when there is enough room in the FIFO to receive data and de-activates the RTS output when the RX FIFO is sufficiently full. The halt and resume trigger levels in the Transmission Control Register (TCR) determine the levels at which RTS is activated/deactivated. If TCR bits are cleared, then selectable trigger levels in FCR are used in place of TCR. If both Auto-CTS and Auto-RTS are enabled, when RTS is connected to CTS, data transmission does not occur unless the receiver FIFO has empty space. Thus, overrun errors are eliminated during hardware flow control. If not enabled, overrun errors occur if the transmit data rate exceeds the receive FIFO servicing latency. UART 1 UART 2 RX SERIAL TO PARALLEL TX PARALLEL TO SERIAL RX FIFO TX FIFO FLOW CONTROL RTS CTS PARALLEL TO SERIAL TX RX FLOW CONTROL SERIAL TO PARALLEL TX FIFO RX FIFO FLOW CONTROL CTS RTS FLOW CONTROL Figure 1. Auto flow control (Auto-RTS and Auto-CTS) example PI7C9X762 Document Number DS40306 Rev 4-2 6 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 2.1 Auto-RTS Figure 2 shows RTS functional timing. The receiver FIFO trigger levels used in Auto-RTS are stored in the TCR. RTS is active if the RX FIFO level is below the halt trigger level in TCR[3:0]. When the receiver FIFO halt trigger level is reached, RTS is de-asserted. The sending device (for example, another UART) may send an additional character after the trigger level is reached (assuming the sending UART has another character to send) because it may not recognize the de-assertion of RTS until it has begun sending the additional character. RTS is automatically reasserted once the receiver FIFO reaches the resume trigger level programmed via TCR[7:4]. This re-assertion allows the sending device to resume transmission. Start RX character N Stop Start character N+1 Stop 1 2 Start IRQ# Receive FIFO Read N N+1 002aab040 (1) N = receiver FIFO trigger level. (2) The two blocks in dashed lines cover the case where an additional character is sent. Figure 2. RTS functional timing 2.2 Auto-CTS Figure 3 shows CTS functional timing. The transmitter circuitry checks CTS before sending the next data character. When CTS is active, the transmitter sends the next character. To stop the transmitter from sending the following character, CTS must be de-asserted before the middle of the last stop bit that is currently being sent. The Auto-CTS function reduces interrupts to the host system. When flow control is enabled, CTS level changes do not trigger host interrupts because the device automatically controls its own transmitter. Without Auto-CTS, the transmitter sends any data present in the transmit FIFO and a receiver overrun error may result. TX Start character N Stop Start bit 0 to bit 7 Stop CTS 002aab041 (1) When CTS is LOW, the transmitter keeps sending serial data out. (2) When CTS goes HIGH before the middle of the last stop bit of the current character, the transmitter finishes sending the current character, but it does not send the next character. (3) When CTS goes from HIGH to LOW, the transmitter begins sending data again. Figure 3. CTS functional timing PI7C9X762 Document Number DS40306 Rev 4-2 7 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 3 Software flow control Software flow control is enabled through the Enhanced Features Register and the Modem Control Register. Different combinations of software flow control can be enabled by setting different combinations of EFR[3:0]. Table 1 shows software flow control options. Table 1. Software flow control options (EFR[3:0]) EFR[3] EFR[2] EFR[1] EFR[0] TX, RX software flow control 0 0 x x no transmit flow control 1 0 x x transmit Xon1, Xoff1 0 1 x x transmit Xon2, Xoff2 1 1 x x transmit Xon1 and Xon2, Xoff1 and Xoff2 x x 0 0 no receive flow control x x 1 0 receiver compares Xon1, Xoff1 x x 0 1 receiver compares Xon2, Xoff2 1 0 1 1 transmit Xon1, Xoff1 receiver compares Xon1 or Xon2, Xoff1 or Xoff2 0 1 1 1 transmit Xon2, Xoff2 receiver compares Xon1 or Xon2, Xoff1 or Xoff2 1 1 1 1 transmit Xon1 and Xon2, Xoff1 and Xoff2 receiver compares Xon1 and Xon2, Xoff1 and Xoff2 0 0 1 1 no transmit flow control receiver compares Xon1 and Xon2, Xoff1 and Xoff2 There are two other enhanced features relating to software flow control: • Xon Any function (MCR[5]): Receiving any character will resume operation after recognizing the Xoff character. It is possible that an Xon1 character is recognized as an Xon Any character, which could cause an Xon2 character to be written to the RX FIFO. • Special character (EFR[5]): Incoming data is compared to Xoff2. Detection of the special character sets the Xoff interrupt (IIR[4]) but does not halt transmission. The Xoff interrupt is cleared by a read of the Interrupt Identification Register (IIR). The special character is transferred to the RX FIFO. 3.1 Receive flow control When software flow control operation is enabled, UART will compare incoming data with Xoff1/Xoff2 programmed characters (in certain cases, Xoff1 and Xoff2 must be received sequentially). When the correct Xoff characters are received, transmission is halted after completing transmission of the current character. Xoff detection also sets IIR[4] (if enabled via IER[5]) and causes IRQ to go LOW. To resume transmission, an Xon1/Xon2 character must be received (in certain cases Xon1 and Xon2 must be received sequentially). When the correct Xon characters are received, IIR[4] is cleared, and the Xoff interrupt disappears. PI7C9X762 Document Number DS40306 Rev 4-2 8 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 3.2 Transmit flow control Xoff1/Xoff2 character is transmitted when the RX FIFO has passed the halt trigger level programmed in TCR[3:0], or the selectable trigger level in FCR[7:6]. Xon1/Xon2 character is transmitted when the RX FIFO reaches the resume trigger level programmed in TCR[7:4], or falls below the lower selectable trigger level in FCR[7:6]. The transmission of Xoff/Xon(s) follows the exact same protocol as transmission of an ordinary character from the FIFO. This means that even if the word length is set to be 5, 6, or 7 bits, then the 5, 6, or 7 least significant bits of Xoff1/Xoff2, Xon1/Xon2 will be transmitted. (Note that the transmission of 5, 6, or 7 bits of a character is seldom done, but this functionality is included to maintain compatibility with earlier designs.) It is assumed that software flow control and hardware flow control will never be enabled simultaneously. Figure 4 shows an example of software flow control. RECEIVE FIFO TRANSMIT FIFO data SERIAL-TO-PARALLEL PARALLEL-TO-SERIAL Xoff–Xon–Xoff SERIAL-TO-PARALLEL PARALLEL-TO-SERIAL Xon1 WORD Xon1 WORD Xon2 WORD Xon2 WORD Xoff1 WORD Xoff1 WORD Xoff2 WORD compare programmed Xon-Xoff characters Xoff2 WORD Figure 4. Example of software flow control PI7C9X762 Document Number DS40306 Rev 4-2 9 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 4. Hardware Reset, Power-On Reset (POR) and Software Reset These three reset methods are identical and will reset the internal registers as indicated in Table 4. Table 2 summarizes the state of register after reset. Table 2. Register reset Register Reset state Interrupt Enable Register all bits cleared Interrupt Identification Register bit 0 is set; all other bits cleared FIFO Control Register all bits cleared Line Control Register reset to 0001 1101 (0x1D) Modem Control Register all bits cleared Line Status Register bit 5 and bit 6 set; all other bits cleared Modem Status Register bits 3:0 cleared; bits 7:4 input signals Enhanced Features Register all bits cleared Receive Holding Register pointer logic cleared Transmit Holding Register pointer logic cleared Transmission Control Register all bits cleared Trigger Level Register all bits cleared Transmit FIFO level reset to 0100 0000 (0x40) Receive FIFO level all bits cleared I/O direction all bits cleared I/O interrupt enable all bits cleared I/O control all bits cleared Extra Features Control Register all bits cleared Remark: Registers DLL, DLH, SPR, XON1, XON2, XOFF1, XOFF2 are not reset by the top-level reset signal RESET, Software Reset, that is, they hold their initialization values during reset. Table 3 summarizes the state of output signals after reset. Table 3. Output signals after reset Signal Reset state TX HIGH RTS HIGH I/Os inputs IRQ HIGH by external pull-up PI7C9X762 Document Number DS40306 Rev 4-2 10 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 5 Interrupts The UART has interrupt generation and prioritization (seven prioritized levels of interrupts) capability. The interrupt enable registers (IER and IOIntEna) enable each of the seven types of interrupts and the IRQ signal in response to an interrupt generation. When an interrupt is generated, the IIR indicates that an interrupt is pending and provides the type of interrupt through IIR[5:0]. Table 4 summarizes the interrupt control functions. Table 4. Interrupt Source and Priority Level IIR[5:0] Priority level Interrupt type Interrupt source 00 0001 none none None 00 0110 1 receiver line status Overrun Error (OE), Framing Error (FE), Parity Error (PE), or Break Interrupt (BI) errors occur in characters in the RX FIFO 00 1100 2 RX time-out Stale data in RX FIFO 00 0100 2 RHR interrupt Receive data ready (FIFO disable) or RX FIFO above trigger level (FIFO enable) 00 0010 3 THR interrupt Transmit FIFO empty (FIFO disable) or TX FIFO passes above trigger level (FIFO enable) 00 0000 4 modem status Change of state of modem input pins 11 0000 5 I/O pins Input pins change of state 01 0000 6 Xoff interrupt Receive Xoff character(s)/special character 10 0000 7 CTS, RTS RTS pin or CTS pin change state from active (LOW) to inactive (HIGH) It is important to note that for the framing error, parity error, and break conditions, Line Status Register bit 7 (LSR[7]) generates the interrupt. LSR[7] is set when there is an error anywhere in the RX FIFO, and is cleared only when there are no more errors remaining in the FIFO. LSR[4:2] always represent the error status for the received character at the top of the RX FIFO. Reading the RX FIFO updates LSR[4:2] to the appropriate status for the new character at the top of the FIFO. If the RX FIFO is empty, then LSR[4:2] are all zeros. For the Xoff interrupt, if an Xoff flow character detection caused the interrupt, the interrupt is cleared by an Xon flow character detection. If a special character detection caused the interrupt, the interrupt is cleared by a read of the IIR. PI7C9X762 Document Number DS40306 Rev 4-2 11 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 5.1 Interrupt mode operation In Interrupt mode (if any bit of IER[3:0] is 1) the host is informed of the status of the receiver and transmitter by an interrupt signal, IRQ. Therefore, it is not necessary to continuously poll the Line Status Register (LSR) to see if any interrupt needs to be serviced. Figure 5 shows Interrupt mode operation. IIR read IIR HOST IRQ IER 1 1 1 1 RHR THR Figure 5. Interrupt mode operation 5.2 Polled mode operation In Polled mode (IER[3:0] = 0000) the status of the receiver and transmitter can be checked by polling the Line Status Register (LSR). This mode is an alternative to the FIFO Interrupt mode of operation where the status of the receiver and transmitter is automatically known by means of interrupts sent to the CPU. Figure 6 shows FIFO Polled mode operation. LSR read LSR HOST IER 0 THR 0 0 0 RHR Figure 6. FIFO Polled mode operation PI7C9X762 Document Number DS40306 Rev 4-2 12 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 6 Sleep mode Sleep mode is an enhanced feature of the UART. It is enabled when EFR[4], the enhanced functions bit, is set and when IER[4] is set. Sleep mode is entered when: • The serial data input line, RX, is idle (see Section 7 “Break and time-out conditions”). • The TX FIFO and TX shift register are empty. • There are no interrupts pending except THR. Remark: Sleep mode will not be entered if there is data in the RX FIFO. In Sleep mode, the clock to the UART is stopped. Since most registers are clocked using these clocks, the power consumption is greatly reduced. The UART will wake up when any change is detected on the RX line, when there is any change in the state of the modem input pins, or if data is written to the TX FIFO. Remark: Writing to the divisor latches DLL and DLH to set the baud clock must not be done during Sleep mode. Therefore, it is advisable to disable Sleep mode using IER[4] before writing to DLL or DLH. 7 Break and time-out conditions When the UART receives a number of characters and these data are not enough to set off the receive interrupt (because they do not reach the receive trigger level), the UART will generate a time-out interrupt instead, 4 character times after the last character is received. The time-out counter will be reset at the center of each stop bit received or each time the receive FIFO is read. A break condition is detected when the RX pin is pulled LOW for a duration longer than the time it takes to send a complete character plus start, stop and parity bits. A break condition can be sent by setting LCR[6], when this happens the TX pin will be pulled LOW until LSR[6] is cleared by the software. 8 Programmable baud rate generator The UART contains a programmable baud rate generator that takes any clock input and divides it by a divisor in the range between 1 and (216 - 1). An additional divide-by-4 prescaler is also available and can be selected by MCR[7], as shown in Figure 7. The formula for the baud rate is: XTAL1 crystal input frequency ) prescaler Baud rate = divisor x sample rate ( where: prescaler = 1, when MCR[7] is set to logic 0 after reset (divide-by-1 clock selected) prescaler = 4, when MCR[7] is set to logic 1 after reset (divide-by-4 clock selected). Divisor = {DLH, DLL} Sample rate = 16 - SCR + CPRN Remark: The default value of prescaler after reset is divide-by-1. PI7C9X762 Document Number DS40306 Rev 4-2 13 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 PRESCALER LOGIC (DIVIDE-BV-1) XTAL1 XTAL2 INTERNAL OSCILLATOR LOGIC MCR[7] = 0 BAUD RATE GENERATOR LOGIC input clock PRESCALER LOGIC (DIVIDE-BY-4) reference clock internal baud rate clock for transmitter and receiver MCR[7] = 1 Figure 7. Prescaler and baud rate generator block diagram DLL and DLH must be written to in order to program the baud rate. DLL and DLH are the least significant and most significant byte of the baud rate divisor. If DLL and DLH are both zero, the UART is effectively disabled, as no baud clock will be generated. Remark: The programmable baud rate generator is provided to select both the transmit and receive clock rates. Table 5 to 8 show the baud rate and divisor correlation for crystal with frequency 1.8432 MHz, 3.072 MHz, 14.74926 MHz, and 24MHz respectively. Figure 8 shows the crystal clock circuit reference. PI7C9X762 Document Number DS40306 Rev 4-2 14 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Table 5. Baud rates using a 1.8432 MHz crystal Desired baud rate (bit/s) Divisor used to generate 16x clock Sample rate Percent error difference between desired and actual 50 2304 16 0 75 1536 16 0 110 1047 16 0.026 134.5 857 16 0.058 150 768 16 0 300 384 16 0 600 192 16 0 1200 96 16 0 1800 64 16 0 2000 46 20 0.617 2400 48 16 0 3600 32 16 0 4800 24 16 0 7200 16 16 0 9600 12 16 0 19200 6 16 0 38400 3 16 0 56000 2 16 2.86 PI7C9X762 Document Number DS40306 Rev 4-2 15 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Table 6. Baud rates using a 3.072 MHz crystal Desired baud rate (bit/s) Divisor used to generate 16x clock Sample rate Percent error difference between desired and actual 50 2304 16 0 75 2560 16 0 110 1745 16 0.026 134.5 1428 16 0.034 150 1280 16 0 300 640 16 0 600 320 16 0 1200 160 16 0 1800 90 19 0.195 2000 96 16 0 2400 80 16 0 3600 45 19 0.195 4800 40 16 0 7200 25 17 0.392 9600 20 16 0 19200 10 16 0 38400 5 16 0 XTAL1 XTAL2 X1 1.8432 MHz C1 22 pF C2 33 pF Figure 8. Crystal oscillator circuit reference PI7C9X762 Document Number DS40306 Rev 4-2 16 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Table 7. Baud rates using a 14.74926 MHz crystal Desired baud rate (bit/s) Divisor used to generate 16x clock Sample rate Percent error difference between desired and actual 38400 24 16 0.025 56000 11 24 0.235 57600 16 16 0.025 115200 8 16 0.025 153600 6 16 0.025 921600 1 16 0.025 Table 8. Baud rates using a 24 MHz crystal Desired baud rate (bit/s) Divisor used to generate 16x clock Sample rate Percent error difference between desired and actual 4800 250 20 0 7200 159 21 0.17 25000 48 20 0 38400 25 25 0 57600 22 19 0.32 115200 8 26 0.16 225000 6 18 1.2 400000 3 20 0 921600 1 26 0.16 1000000 1 24 0 PI7C9X762 Document Number DS40306 Rev 4-2 17 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 9. RS-485 features 9.1 Auto RS-485 RTS control Normally the RTS pin is controlled by MCR bit 1, or if hardware flow control is enabled, the logic state of the RTS pin is controlled by the hardware flow control circuitry. EFCR register bit 4 will take the precedence over the other two modes; once this bit is set, the transmitter will control the state of the RTS pin. The transmitter automatically asserts the RTS pin (logic 0) once the host writes data to the transmit FIFO, and de-asserts RTS pin (logic 1) once the last bit of the data has been transmitted. To use the auto RS-485 RTS mode the software would have to disable the hardware flow control function. 9.2 RS-485 RTS output inversion EFCR bit 5 reverses the polarity of the RTS pin if the UART is in auto RS-485 RTS mode. When the transmitter has data to be sent it de-asserts the RTS pin (logic 1), and when the last bit of the data has been sent out the transmitter asserts the RTS pin (logic 0). 9.3 Auto RS-485 EFCR bit 0 is used to enable the RS-485 mode (multidrop or 9-bit mode). In this mode of operation, a ‘master’ station transmits an address character followed by data characters for the addressed ‘slave’ stations. The slave stations examine the received data and interrupt the controller if the received character is an address character (parity bit = 1). To use the auto RS-485 RTS mode the software would have to disable the hardware flow control function. 9.3.1 Normal multidrop mode The 9-bit mode in EFCR (bit 0) is enabled, but not Special Character Detect (EFR bit 5). The receiver is set to Force Parity 0 (LCR[5:3] = 111) in order to detect address bytes. With the receiver initially disabled, it ignores all the data bytes (parity bit = 0) until an address byte is received (parity bit = 1). This address byte will cause the UART to set the parity error. The UART will generate a line status interrupt (IER bit 2 must be set to ‘1’ at this time), and at the same time puts this address byte in the RX FIFO. After the controller examines the byte it must make a decision whether or not to enable the receiver; it should enable the receiver if the address byte addresses its ID address, and must not enable the receiver if the address byte does not address its ID address. If the controller enables the receiver, the receiver will receive the subsequent data until being disabled by the controller after the controller has received a complete message from the ‘master’ station. If the controller does not disable the receiver after receiving a message from the ‘master’ station, the receiver will generate a parity error upon receiving another address byte. The controller then determines if the address byte addresses its ID address, if it is not, the controller then can disable the receiver. If the address byte addresses the ‘slave’ ID address, the controller take no further action; the receiver will receive the subsequent data. 9.3.2 Auto address detection If Special Character Detect is enabled (EFR[5] is set and XOFF2 contains the address byte) the receiver will try to detect an address byte that matches the programmed character in XOFF2. If the received byte is a data byte or an address byte that does not match the programmed character in XOFF2, the receiver will discard these data. Upon receiving an address byte that matches the XOFF2 character, the receiver will be automatically enabled if not already enabled, and the address character is pushed into the RX FIFO along with the parity bit (in place of the parity error bit). The receiver also generates a line status interrupt (IER bit 2 must be set to 1 at this time). The receiver will then receive the subsequent data from the ‘master’ station until being disabled by the controller after having received a message from the ‘master’ station. If another address byte is received and this address byte does not match XOFF2 character, the receiver will be automatically disabled and the address byte is ignored. If the address byte matches XOFF2 character, the receiver will put this byte in the RX FIFO along with the parity bit in the parity error bit (LSR[2]). PI7C9X762 Document Number DS40306 Rev 4-2 18 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 10. I2C-bus Interface The I2C-bus interface is compliant with the Standard-mode and Fast-mode I2C-bus specifications. The I2C-bus interface consists of two lines: serial data (SDA) and serial clock (SCL). In the Standard-mode, the serial clock and serial data can go up to 100 kbps and in the Fast-mode, the serial clock and serial data can go up to 400 kbps. The first byte sent by an I2C-bus master contains a start bit (SDA transition from HIGH to LOW when SCL is HIGH), 7-bit slave address and whether it is a read or write transaction. The next byte is the sub-address that contains the address of the register to access. The UART responds to each write with an acknowledge (SDA driven LOW by UART for one clock cycle when SCL is HIGH). If the TX FIFO is full, the UART will respond with a negative acknowledge (SDA driven HIGH by UART for one clock cycle when SCL is HIGH) when the CPU tries to write to the TX FIFO. The last byte sent by an I2C-bus master is a stop bit (SDA transition from LOW to HIGH when SCL is HIGH). See Figures 8 - 10 below. For complete details, see the I2C-bus specifications. SDA SCL S P START condition STOP condition Figure 9. I2C Start and Stop Conditions SLAVE ADDRESS S W REGISTER ADRESS A A nDATA A P White block: host to UART Grey block: UART to host Figure 10. Master writes to slave (UART) S SLAVE ADDRESS W A REGISTER ADRESS A S SLAVE ADDRESS R A nDATA A LAST DATA NA P White block: host to UART Grey block: UART to host Figure 11. Master reads from slave (UART) PI7C9X762 Document Number DS40306 Rev 4-2 19 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Data transferred (n bytes + acknowledge) Master write: S SLAVE ADDRESS START condition W A DATA DATA A acknowledge write acknowledge A P acknowledge STOP condition Data transferred (n bytes + acknowledge) Master read: S SLAVE ADDRESS START condition R A DATA read acknowledge DATA A acknowledge NA P acknowledge STOP condition Data transferred (n bytes + acknowledge) Combined formats: S SLAVE ADDRESS START condition R/W A DATA Read or acknowledge write A Sr Data transferred (n bytes + acknowledge) SLAVE ADDRESS acknowledge Repeated START condition R/W A DATA Read or acknowledge write A P acknowledge STOP condition Direction of transfer may change at this point Figure 12. I2C data formats PI7C9X762 Document Number DS40306 Rev 4-2 20 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 10.1 I2C-bus Addressing There could be many devices on the I2C-bus. To distinguish itself from the other devices on the I2C-bus, there are eight possible slave addresses that can be selected for the UART using the A1 and A0 address lines. Table 9 below shows the different addresses that can be selected. Note that there are two different ways to select each I2C address. Table 9: I2C Address Map I2C ADDRESS A1 A0 VDD VDD 0x90 (1001 000X) VDD VSS 0x92 (1001 001X) VDD SCL 0x94 (1001 010X) VDD SDA 0x96 (1001 011X) VSS VDD 0x98 (1001 100X) VSS VSS 0x9A (1001 101X) VSS SCL 0x9C (1001 110X) VSS SDA 0x9E (1001 111X) SCL VDD 0xA0 (1010 000X) SCL VSS 0xA2 (1010 001X) SCL SCL 0xA4 (1010 010X) SCL SDA 0xA6 (1010 011X) SDA VDD 0xA8 (1010 100X) SDA VSS 0xAA (1010 101X) SDA SCL 0xAC (1010 110X) SDA SDA 0xAE (1010 111X) An I2C sub-address is sent by the I2C master following the slave address. The sub-address contains the UART register address being accessed. A read or write transaction is determined by bit-0 of the slave address (HIGH = Read, LOW = Write). Table 10 below lists the functions of the bits in the I2C sub-address. Table 10: I2C Sub-Address (Register Address) Bit Function 7 Reserved 6:3 UART Internal Register Address A3:A0 2:1 UART Channel Select ’00’ = UART Channel A ’01’ = UART Channel B other values are reserved 0 Reserved After the last read or write transaction, the I2C-bus master will set the SCL signal back to its idle state (HIGH). PI7C9X762 Document Number DS40306 Rev 4-2 21 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 11. SPI Bus Interface The SPI interface consists of four lines: serial clock (SCL), chip select (CS#), slave output (SO) and slave input (SI). The serial clock, slave output and slave input can be as fast as 33 MHz at 3.3V. To access the device in the SPI mode, the CS# signal for the UART is asserted by the SPI master, then the SPI master starts toggling the SCL signal with the appropriate transaction information. The first bit sent by the SPI master includes whether it is a read or write transaction and the UART register being accessed. See Table 11 below. Table 11: SPI First Byte Format Bit Function 7 Read/Write# Logic 1 = Read Logic 0 = Write 6:3 UART Internal Register Address A3:A0 2:1 UART Channel Select ’00’ = UART Channel A ’01’ = UART Channel B Other values are reserved 0 Reserved SCLK SI R/W A3 A2 A1 0 A0 CH X D7 D6 D5 D4 D3 D3 D2 D2 D1 D0 Figure 13. SPI write SCLK SI R/W A3 SO A2 A1 A0 0 CH X D7 D6 D5 D4 D1 D0 Figure 14. SPI read PI7C9X762 Document Number DS40306 Rev 4-2 22 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 The 64 byte TX FIFO can be loaded with data or 64 byte RX FIFO data can be unloaded in one SPI write or read sequence. SCLK SO R/W A3 A2 A1 A0 0 CH X D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 last bit Figure 15. SPI FIFO write SCLK R/W A3 A2 A1 A0 0 CH X D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 last bit Figure 16. SPI FIFO read After the last read or write transaction, the SPI master will set the SCL signal back to its idle state (LOW). PI7C9X762 Document Number DS40306 Rev 4-2 23 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 12 Infrared Mode The UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data Association) version 1.0 and 1.1. The IrDA 1.0 standard that stipulates the infrared encoder sends out a 3/16 of a bit wide HIGH-pulse for each “0” bit in the transmit data stream with a data rate up to 115.2 Kbps. For the IrDA 1.1 standard, the infrared encoder sends out a 1/4 of a bit time wide HIGHpulse for each "0" bit in the transmit data stream with a data rate up to 1.152 Mbps. This signal encoding reduces the on-time of the infrared LED, hence reduces the power consumption. See Figure 17 below. The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. With this bit enabled, the infrared encoder and decoder is compatible to the IrDA 1.0 standard. For the infrared encoder and decoder to be compatible to the IrDA 1.1 standard, EFCR bit-7 will also need to be set to a ’1’. When the infrared feature is enabled, the transmit data output, TX, idles LOW. Likewise, the RX input also idles LOW, see Figure 17. The wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin. Each time it senses a light pulse, it returns a logic 1 to the data bit stream. The UART can be in the infrared mode upon power-up if the ENIR# pin is LOW. After power-up, the infrared mode can be controlled via MCR bit-6. Character Start 0 Data Bits 1 0 1 0 Stop 1 0 1 0 Tx Data Transmit IR Pulse (TX Pin) 1/2 Bit Time 3/16 or 1/4 Bit Time Bit Time Receive IR Pulse (RX Pin) IrEncoder-1 Bit Time 1/16 Clock Delay 0 1 0 1 0 0 1 1 0 1 RX Data Start Data Bits Stop Character IRdecoder-1 Figure 17. Infrared transmit data receive data deconding PI7C9X762 Document Number DS40306 Rev 4-2 24 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers Offset 00H: Receiver Holding Register (RHR). Accessable when LCR[7]=0. Default=00 Bit Type Description [7:0] RO Rx Holding - When data are read from the RHR,they are removed from the top of the receiver's FIFO. Data read from the RHR when FIFO is empty are invalid. The Line Status Register(LSR) indicates the full or empty status of the FIFOs. Offset 00H: Transmitter Holding Register (THR). Accessable when LCR[7]=0. Default=00 Bit Type Description [7:0] WO Tx Holding - When data are written to the THR,they are written to the bottom of the transmitter's FIFO. Data written to the THR when FIFO is full are lost. The Line Status Register(LSR) indicates the full or empty status of the FIFOs. Offset 00H: Divisor Latch LSB(DLL). Accessable when LCR[7]=1 and LCR!=0xBF. Default=01 Bit Type [7:0] WO Description LSB bits of divisor for baud rate generator. Note: It is reset only when Power-On-Reset. Offset 01H: Interrupt Enable Register (IER). Accessable when LCR[7]=0. Default=00 Bit Type Description 7 RW CTS interrupt - "1": Enable CTS/DSR interrupt 6 RW RTS interrupt - "1": Enable RTS/DTR interrupt 5 RW Xoff/Special charatcter interrupt - "1": Enable the Software Flow Control interrupt RW Sleep mode - "1" : Enable sleep mode (It requires EFR[4] = 1). The Uart may enter sleep mode when all conditions met: - no interrupts pending - modem inputs are not toggled - RX input pin is idling HIGH - TX/RX FIFO are empty 4 It will exit from sleep mode when any below condition met: - modem inputs are toggling - RX input pin changed to LOW -a data byte is loaded to the TX FIFO In sleep mode, Crystal is stopped and no Uart clock 3 RW Modem Status interrupt - "1": Enable Modem Status interrupt 2 RW Receiver Line Status interrupt - "1": Enable Receiver Line Status interrupt 1 RW 1 = Interrupt is issued whenever the THR becomes empty in non-FIFO mode or when spaces in the FIFO is above the trigger level in the FIFO mode. 0 RW Rx Data Ready interrupt - "1": enable Data Ready interrupt Tx Ready interrupt - "1": Enable THR Ready interrupt Note: IER[7:4] can only be modified if EFR[4]=1. PI7C9X762 Document Number DS40306 Rev 4-2 25 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 01H: Divisor Latch MSB(DLH). Accessable when LCR[7]=1 and LCR!=0xBF. Default=00 Bit Type [7:0] RW Description MSB bits of divisor for baud rate generator. Note: It is reset only when Power-On-Reset. Offset 02H: Interrupt Identification Register (IIR). Accessable when LCR[7]=0. Default=01 Bit Type Description [7:6] RO Mirror the content of FCR[0] [5:1] RO 5-bit encoded interrupt. 0 RO Interrupt status. "1": No interrupt is pending. "0": An interrupt is pending. Priority Level IIR[5] IIR[4] IIR[3] IIR[2] IIR[1] IIR[0] Source of Interrupt 1 0 0 0 1 1 0 Receive Line Status Error 2 0 0 1 1 0 0 Receiver timeout 2 0 0 0 1 0 0 RHR interrupt 3 0 0 0 0 1 0 THR interrupt 4 0 0 0 0 0 0 Modem interrupt 5 1 1 0 0 0 0 Input pin change of state 6 0 1 0 0 0 0 Rx Xoff signal/special character 7 1 0 0 0 0 0 CTS,RTS change from active to inactiove Note: IIR[4] is cleared by Xon detection if the interrupt is caused by Xoff detection, or cleared by a read of the IIR if it is caused by special char detection. Offset 02H: FIFO Control Register (FCR). Accessable when LCR[7]=0. Default=00 Bit Type Description WO RX trigger. Sets the trigger level for the RX FIFO 00 = 8 characters 01 = 16 characters 10 = 56 characters 11 = 60 characters [5:4] WO TX trigger. Sets the trigger level for the TX FIFO 00 = 8 spaces 01 = 16 spaces 10 = 32 spaces 11 = 56 spaces 3 RO Reserved WOS Reset TX FIFO. 0 = No FIFO transmit reset 1 = Clears the contents of Tx FIFO and resets the FIFO level logic. TSR is not cleared. This bit will return to logic 0 after clearing the FIFO WOS Reset RX FIFO. 0 = No FIFO receive reset 1 = Clears the contents of Rx FIFO and resets the FIFO level logic. RSR is not cleared. This bit will return to logic 0 after clearing the FIFO [7:6] 2 1 PI7C9X762 Document Number DS40306 Rev 4-2 26 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. 0 WO FIFO enable 0 = Disable the transmit and receive FIFO, and TX/RX can only hold one character at a time. Other FCR bits are not programmable, and the trigger level is set to one character. 1 = enable the transmit and receive FIFO. and TX/RX FIFO can hold 64 characters. Note: FCR[5:4] can only be modified and enabled if EFR[4]=1. Offset 02H: Enhanced Feature Register (EFR). Accessable when LCR=0xBF and SFR[2]=0. Default=00 Bit Type Description 7 RW Auto CTS Flow Control Enable 0 = Automatic CTS flow control is disabled. 1 = Automatic CTS flow control is enabled. 6 RW Auto RTS Flow Control Enable 0 = Automatic RTS flow control is disabled. 1 = Automatic RTS flow control is enabled. 5 RW Special character detect 0 = Special character detect is disabled. 1 = Special character detect is enabled. If received data matchs Xoff2 data, the received data is transferred to RX FIFO and IIR[4] is set to high to indicate a special character detection. However,if flow control is set for comparing Xoff2, then flow control works normally and Xoff2 will not go to the FIFO and will generate an Xoff interrupt and a special character interrupt. 4 RW Enhanced Function Bits Enable This bit enables IER[7:4],IIR[5:4],FCR[5:4],MCR[7:5],TCR and TLP to be modified, and enables the sleep mode. [3:0] RW Software Flow Control Select: 00xx = No TX flow control 10xx = Transmit Xon1,Xoff1 01xx = Transmit Xon2,Xoff2 11xx = Transmit Xon1 and Xon2,Xoff1 and Xoff2 xx00 = No RX flow control xx10 = Receiver compares Xon1,Xoff1 xx01 = Receiver compares Xon2,Xoff2 1011 = Transmit Xon1,Xoff1; Receiver compares Xon1 or Xon2,Xoff1 or Xoff2 0111 = Transmit Xon2,Xoff2; Receiver compares Xon1 or Xon2,Xoff1 or Xoff2 1111 = Transmit Xon1 and Xon2,Xoff1 and Xoff2; Receiver compares Xon1 and Xon2,Xoff1 and Xoff2 0011 = No transmit flow control; Receiver compares Xon1 and Xon2,Xoff1 and Xoff2 Offset 03H: Line Control Register (LCR). Default=1D Bit Type Description 7 RW Divisor latch enabled when set 6 RW Break control bit. 0 = no TX break condition 1 = forces TX to logic 0 to alert a line break condition PI7C9X762 Document Number DS40306 Rev 4-2 27 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. 5 RW Set forced parity format(if LCR[3]=1) 0 = parity is not forced. 1 = parity bit is forced to high if LCR[4]=0,or low if LCR[4]=1. 4 RW Parity type select. 0 = odd parity is generated(if LCR[3]=1) 1 = even parity is generated(if LCR[3]=1) 3 RW Parity enable when set 2 RW Number of Stop bits 0 = 1 stop bit. 1 = 1.5 stop bits for word length=5, or 2 stop bits for word length=6,7,8 RW Word length bits: 00 = 5 bits. 01 = 6 bits 10 = 7 bits. 11 = 8 bits 1:0 Offset 04H: Modem Control Register (MCR). Accessable when LCR[7]=0. Default=00 Bit Type Description 7 RW Clock pre-scaler select. 0 = divide-by-1 clock input 1 = divide-by-4 clock input 6 RW IrDA mode enable when set. 5 RW When set, Xon Any function is enabled and receiving any character will resume transmit operation. the RX character will be loaded into the RX FIFO. unless the RX character is an Xon/Xoff character and receiver software flow control is enabled. 4 RW When set, internal loopback mode is enabled and TX output is looped back to the RX input internally, and MCR[1:0] signals are looped back into MSR[4:5] 3 RW OP2. It is not available as an output pin but can be controlled in Internal Loopback Mode(MCR[4]=1) and is outputed to DCD internally. 2 RW OP1/TCR and TLR enable. In Internal Loopback Mode(MCR[4]=1), it is outputed to RI internally. otherwise it is used to select between the MSR and TCR registers at offset 0x6 and the SPR and TLR registers at offset 0x7. 1 RW RTS pin control. 0 = force RTS pin High 1 = force RTS pin Low When IN internal loopback mode, it controls MSR[4]. If Auto-RTS is enabled, the RTS pin is controlled by hardware flow control . 0 RW DTR pin control if GPIO5 or GPIO1 is selected as DTR modem pin through IOControl register bit 1 or bit 2: 0 = force DTR pin High 1 = force DTR pin Low When internal loopback mode, it controls MSR[5]. Note: MCR[7:5],MCR[3:2] can only be modified if EFR[4]=1. PI7C9X762 Document Number DS40306 Rev 4-2 28 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 04H: XON1 character Register (XON1). Accessable when LCR=0xBF and SFR[2]=0. Default=00 Bit Type [7:0] RW Description XON1 character Note: It is reset only when Power-On-Reset. Offset 05H: Line Status Register (LSR). Accessable when LCR[7]=0. Default=60 Bit Type Description 7 RO Receiver FIFO Data Error Flag. 0 = No FIFO Error 1 = a flag for the sum of all error bits (parity error, framing error, or break) in the RX FIFO. this bit clears when there is no more error in any of the bytes in the RX FIFO. 6 RO THR and TSR Empty Flag This bit is set whenever the transmitter goes idle, it clears whenever either the THR or TSR contains a data character. 5 RO THR Empty Flag This bit is set when the last data byte is transferred from THR to TSR. RO Receiver Break Error Flag 0 = No Break Error 1 = break condition occurred in data to be read from RX FIFO(RX was LOW for at least one character frame time). 3 RO Receiver Data Framing Error Flag 0 = No Data Framing Error 1 = framing error occurred in data to be read from RX FIFO (The receive character did not have a valid stop bits). 2 RO Receiver Data Parity Error Flag 0 = No Data Parity Error 1 = parity error in data to be read from RX FIFO 1 RO Receiver Overrun Error 0 = No verrun Error 1 = additional data received while the RX FIFO is full. This data should not be transferred into FIFO. 0 RO Receiver Data Ready Indicator 0 = No data in received in RX FIFO 1 = Data has been received and saved in the RX FIFO 4 Offset 05H: XON2 character Register (XON2). Accessable when LCR=0xBF and SFR[2]=0. Default=00 Bit Type [7:0] RW Description XON2 character Note: It is reset only when Power-On-Reset. Offset 06H: Modem Status Register (MSR). Accessable when LCR[7]=0 and MCR[2]=0 and SFR[2]=0. Default=00 Bit Type Description CD input satus 7 RO Normally this bit is the complement of the CD# input. In the loopback mode this bit is equivalent to MCR[3]. PI7C9X762 Document Number DS40306 Rev 4-2 29 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. RI input satus 6 RO Normally this bit is the complement of the RI# input. In the loopback mode this bit is equivalent to MCR[2]. DSR input satus 5 RO Normally this bit is the complement of the DSR# input. In the loopback mode this bit is equivalent to MCR[0]. CTS input satus 4 RO Normally this bit is the complement of the CTS# input. In the loopback mode this bit is equivalent to MCR[1]. 3 2 1 0 RO Delta CD# input flag 0 = No change on CD# input 1 = The CD# input has changed state. A modem status interrupt will be generated if MSR interrupt is enabled. RO Delta RI# input flag 0 = No change on RI# input 1 = The RI# input has changed from a LOW to HIGH. A modem status interrupt will be generated if MSR interrupt is enabled. RO Delta DSR# input flag 0 = No change on DSR# input 1 = The DSR# input has changed state. A modem status interrupt will be generated if MSR interrupt is enabled. RO Delta CTS# input flag 0 = No change on CTS# input 1 = The CTS# input has changed state. A modem status interrupt will be generated if MSR interrupt is enabled. Offset 06H: Transmission Control Register (TCR). Accessable when EFR[4]=1 and MCR[2]=1 and SFR[2]=0. Default=00 Bit Type Description RX FIFO Resume level. [7:4] RW When the RX FIFO is less than or equal to the value (decimal value of TCR[7:4] multiplied by 4), the RTS# output will be re-asserted if Auto RTS flow is used or XON character will be transmitted if Auto XON/XOFF flow control is used. It is recommended that this value is less than the RX Trigger Level. RX FIFO Halt level. [3:0] RW When the RX FIFO is greater than or equal to the value (decimal value of TCR[3:0] multiplied by 4), the RTS# output will be de-asserted if Auto RTS flow is used or XOFF character will be transmitted if Auto XON/XOFF flow control is used. It is recommended that this value is greater than the RX Trigger Level. Offset 06H: XOFF1 character Register (XOFF1). Accessable when LCR=0xBF and SFR[2]=0. Default=00 Bit Type [7:0] RW PI7C9X762 Document Number DS40306 Rev 4-2 Description XOFF1 character Note: It is reset only when Power-On-Reset. 30 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 07H: Scratch Pad Register (SPR). Accessable when LCR[7]=0 and MCR[2]=0. Default=FF Bit [7:0] Type Description RW This is 8-bit general purpose register for the user to store temporary data. the content is preserved during sleep mode. Note: It is reset only when Power-On-Reset. Offset 07H: Trigger Level Register (TLR). Accessable when EFR[4]=1 and MCR[2]=1. Default=00 Bit Type Description RX FIFO Trigger level. [7:4] RW When the number of characters received in RX FIFO is greater than or equal to the value (decimal value of TLR[7:4] multiplied by 4), a Receive Data Ready interrupt is generated. If TLR[7:4]=0x0, then the RX FIFO Trigger Level is the value selected by FCR[7:6] TX FIFO Trigger level. [3:0] RW When the number of available space in TX FIFO is greater than or equal to the value (decimal value of TLR[3:0] multiplied by 4), a Transmit Ready interrupt is generated. If TLR[3:0]=0x0, then the TX FIFO Trigger Level is the value selected by FCR[5:4] Offset 07H: XOFF2 character Register (XOFF2). Accessable when LCR=0xBF and SFREN!=0x5A. Default=00 Bit Type [7:0] RW Description XOFF2 character Note: It is reset only when Power-On-Reset. Offset 08H: Transmit FIFO Level Register (TXLVL). Accessable when SFR[2]=0. Default=40 Bit Type Description [7:0] RO This register reports the number of spaces available in the TX FIFO. Offset 09H: Receiver FIFO Level Register (RXLVL). Accessable when SFR[2]=0. Default=00 Bit Type Description [7:0] RO This register reports the number of character available in the RX FIFO. Offset 0AH: GPIO Direction Register (IODir). Default=00 Bit Type Description [7:0] RW This register program the direction of the GPIO pins. 0 = set GPIO pin as input 1 = set GPIO pin as output Offset 0BH: GPIO State Register (IOState). Default=FF Bit [7:0] PI7C9X762 Type Description RW This register reports the state of all GPIO pins during read and writes to any GPIO that is an output 0 = set output pin LOW 1 = set output pin HIGH Document Number DS40306 Rev 4-2 31 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 0CH: GPIO Interrupt Enable Register (IOIntEna). Default=00 Bit [7:0] Type Description RW This register enable the interrupt for GPIO pins. If GPIO[7:4] or GPIO[3:0] are programmed as modem pins, IOIntEna will have no effect on GPIO[7:4] or GPIO[3:0]. 0 = disabled 1 = enabled Offset 0EH: GPIO Control Register (IOControl). Default=00 Bit Type Description [7:4] RO Reserved Uart Software Reset. 3 RW Writing a logic 1 to this bit will reset the device. This bit is automatically be reset after device is reset. 2 RW GPIO[3:0] or Modem IO Select(CH B) 0 = GPIO[3:0] behave as GPIO pins 1 = GPIO[3:0] behave as RIB#,CDB#,DTRB#,DSRB# 1 RW GPIO[7:4] or Modem IO Select(CH A) 0 = GPIO[7:4] behave as GPIO pins 1 = GPIO[7:4] behave as RIA#,CDA#,DTRA#,DSRA# RW This bit enable GPIO inputs latching 0 = GPIO input values are not latched. If the input goes back to its initial logic state before the input register is read, then the interrupt is cleared. 1 = GPIO input values are latched. If the input goes back to its initial logic state before the input register is read, then the interrupt is not cleared and the corresponding bit of IOState register keeps the logic value that generated the interrupt. 0 Offset 0FH: Extra Features Control Register (EFCR). Accessable when SFR[2]=0, Default=00 Bit Type Description 7 RW IrDA mode. 0 = IrDA version 1.0, 3/16 pulse ratio,data rate up to 115.2 Kbps 1 = IrDA version 1.1, 1/4 pulse ratio,data rate up to 1.152 Mbps 6 RO Reserved Auto RS-485 Polarity Inversion 5 RW This bit changes the polarity of the Auto RS-485 Direction Control output(RTS#). it will only affect the behavior of RTS# if EFCR[4]=1 0 = RTS# output is LOW when transmitting and HIGH when receiving 1 = RTS# output is HIGH when transmitting and LOW when receiving Auto RS-485 direction control 4 RW This bit enables the transmitter to control RTS# pin 0 = transmitter does not control RTS# pin 1 = transmitter controls RTS# pin 3 RO Reserved Notes: GPIO registers(0AH-0EH) are channel independent. For example, setting software reset will reset all channels. PI7C9X762 Document Number DS40306 Rev 4-2 32 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. 2 RW Transmitter Disable 0 = transmitter is enabled 1 = transmitter is disabled,Uart does not send serial data out on the TX output pin after current data in the TSR is send. 1 RW Receiver Disable 0 = Receiver is enabled 1 = Receiver is disabled 0 RW 9-bit or Multidrop Mode Enable 0 = Normal 8-bit mode 1 = Enable 9-bit mode (addition bit defines data or address byte) Offset 0DH: Special Features Enable Control Register (SFREN). Accessable when LCR==8'hBF. Default=00 Bit Type Description [7:0] RW Set 8'h5A to enable SFR register access Offset 02H: Advance Status Register (ASR). Accessable when LCR=0xBF and SFR[2]=1. Default=00 Bit Type Description [7:6] RO Reserved [5:4] RO Xon/Xoff flow state 00 = idle state 01 = Xoff received 10 = TX off 11 = Xon received [3:2] RO Reserved 1 RO Remote TX disabled 1 = TX has sent XOFF message or RTS message 0 RO Transmitter terminate condition 1 = This TX has disabled by remote termiate. Offset 04H: Clock Prescale Register (CPR). Accessable when LCR=0xBF and SFR[2]=1. Default=10 Bit Type Description [7:4] RW CPRM - M number in calculating the prescaler,which is used to generate Baud Rate,it is recommended to be set to "01h" or "02h" [3:0] RW CPRN - N number in calculating the prescaler,which is used to generate Baud Rate. Offset 05H: Received FIFO Data counter Register (RFD). Accessable when LCR=0xBF and SFR[2]=1, SFR[6]=0. Default=00 Bit Type Description [7:0] RO Indicated the amount of data in RX FIFO Offset 05H: Received Line Error Status counter Register (RLS). Accessable when LCR=0xBF and SFR[2]=1, SFR[6]=1. Default=00 Bit Type Description [7:0] RO Indicated the amount of data byte with error in RX FIFO PI7C9X762 Document Number DS40306 Rev 4-2 33 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 06H: Transmitter FIFO Data counter Register (TFD). Accessable when LCR=0xBF and SFR[2]=1. Default=00 Bit Type Description [7:0] RO Indicated the amount of data in TX FIFO Offset 07H: Special Function Register(SFR). Accessable when LCR=0xBF and SFREN==0x5A. Default=00 Bit Type Description 7 RW If set, Crystal feedback resistor disable 6 RW RFD/LSR counter select 0 = Receive FIFO Data Counter is selected 1 = Line Status Error Counter is selected 5 RW Reserved 4 RW Registers burst R/W enable if set 3 RW enable the loopback from RX to TX internally 2 RW Special Register Access Enable when set, registers(CPR,ISCR,TIDLE,TRCTL) are accessable. 1 RW Auto DSR and DTR Flow Control enable 0 = Auto DSR and DTR Flow Control is disabled 1 = Auto DSR and DTR Flow Control is enabled 0 RW If set, forces transmitter to always to transmit data Offset 08H: Transmit Idle Time Count Register (TIDLE). Accessable when LCR=0xBF and SFR[2]=1. Default=00 Bit Type Description [7:0] RW Transmit Idle Time control. Offset 09H: TX/RX Control Register (SCR/TRCTL). Accessable when LCR=0xBF and SFR[2]=1. Default=06 Bit Type Description [7:4] RW SCR - Sample Clock value used in the Baud Rate Generator. Baud Rate = XIN / (DL * 2 ** (M+2*MCR[7]-1) * (16-SCR+N)) 3 RW Transmit In-band Xon enable 2 RW TX Empty Interrupt enable 1 RW RX Timeout enable 0 RW TX Idle insertion enable Note: When IrDA mode is enabled, the setting in register SCR(bit 7-3 of 09H) and N(bit 3-0 of CPR should meet: SCR=N or (16-SCR+N) > 1. PI7C9X762 Document Number DS40306 Rev 4-2 34 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Configuration Registers cont. Offset 0FH: Interrupt Status and Clear Register (ISCR). Accessable when LCR=0xBF and SFR[2]=1. Default=00 Bit Type Description 7 RW 1 = CTS/RTS change Interrupt is active 6 RW 1 = Rx Xoff signal/special character Interrupt is active 5 RW 1 = Modem Interrupt is active 4 RW 1 = THR Interrupt is active 3 RW 1 = Receiver Timeout Interrupt is active 2 RW 1 = RHR Interrupt is active 1 RW 1 = Receive Line Error Interrupt is active 0 RW CLSTATUS, when set, the Interrupt Status registers are cleared. This bit returns to zero after write. PI7C9X762 Document Number DS40306 Rev 4-2 35 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Maximum Ratings (Above which useful life may be impaired. For user guidelines, not tested.) Power Supply Range..........................................................................3.8V Voltage at IO Pins....................................................... GND-0.3V to 5.5V Storage Temperature .....................................................–65°C to +150°C Package Dissipation.....................................................................500 mW Junction Temperature (Tj)............................................................... 125oC Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. DC Electrical Characteristics (TA = -40o to + 85oC, VDD = 1.62V - 3.63V) VDD = 1.8V ± 10% Symbol Parameter VDD = 2.5V ± 10% VDD = 3.3V ± 10% Min. Max. Min. Max. Min. Max. Unit VILCK Clock input low level -0.3 0.3 -0.3 0.6 -0.3 0.6 V VIHCK Clock input high level 1.4 VDD 1.8 VDD 2.4 VDD V VIL Input low voltage -0.3 0.2 -0.3 0.5 -0.3 0.8 V VIH Input high voltage 1.4 5.5 1.8 5.5 2.0 5.5 V VOL VOH Output low voltage Output high voltage 0.4 0.4 1.4 1.8 0.4 2.0 Conditions V IOL = 4 mA V IOL = 2 mA V IOL = 1.5 mA V IOH = -1 mA V IOH = -400 uA V IOH = -200 uA IIL Input low leakage current 10 10 10 uA IIH Input high leakage current 10 10 10 uA CIN Input pin capacitance 5 5 5 pF ICC Power supply current 3 3 6 mA ISLEEP Sleep current 15 20 30 uA XTAL1 = 14.75 MHz Note: 5.5V steady voltage tolerance on inputs and outputs is valid only when the supply voltage is present. AC Electrical Characteristics - UART Clock (TA = -40o to + 85oC, VDD = 1.62V - 3.63V) Symbol Parameter VDD = 1.8V ± 5% VDD = 1.8V ± 10% VDD = 2.5V ± 10% VDD = 3.3V ± 10% Min. Min. Min. Min. Max. Max. Max. Max. Unit XTAL1 UART Crystal Oscillator 24 24 24 24 MHz ECLK UART External Clock 32 24 250 64 MHz TECLK External Clock Time Period PI7C9X762 Document Number DS40306 Rev 4-2 1/ECLK 1/ECLK 36 1/ECLK 1/ECLK www.diodes.com ns May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 AC Electrical Characteristic - I2C-Bus Timing Specifications (Unless otherwise noted: TA = -40o to +85oC, VDD = 1.62 - 3.63V) Standard Mode Symbol Parameter Fast Mode Min. Max. Min. Max. Unit 0 100 0 400 kHz f SCL Operating frequency TBUF Bus free time between STOP and START 4.7 1.3 μs THD;STA START condition hold time 4.0 0.6 μs TSU;STA START condition setup time 4.7 0.6 μs THD;DAT Data hold time 0 0 ns TVD;ACK Data valid acknowledge 0.6 0.6 μs TVD;DAT SCL LOW to data out valid 0.6 0.6 μs TSU;DAT Data setup time 250 150 ns TLOW Clock LOW period 4.7 1.3 μs THIGH Clock HIGH period 4.0 0.6 μs TF Clock/data fall time 300 300 ns TR Clock/data rise time 1000 300 ns TSP Pulse width of spikes tolerance 100 100 ns TD1 I2C-bus GPIO output valid 0.2 0.2 μs TD2 I2C-bus modem input interrupt valid 0.2 0.2 μs TD3 I2C-bus modem input interrupt clear 0.2 0.2 μs TD4 I2C input pin interrupt valid 0.2 0.2 μs TD5 I2C input pin interrupt clear 0.2 0.2 μs TD6 I2C-bus receive interrupt valid 0.2 0.2 μs TD7 I2C-bus receive interrupt clear 0.2 0.2 μs TD8 I2C-bus transmit interrupt clear 1.0 0.5 μs TD15 SCL delay after reset 3 3 μs PI7C9X762 Document Number DS40306 Rev 4-2 37 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 RESET# TD15 SCL Figure 1. SCL Delay After Reset START condition (S) Protocol Bit 7 MSB (A7) TLOW TSU;STA Bit 0 LSB (R/W) Bit 6 (A6) Acknowledge (A) STOP condition (P) TD15 THIGH 1/FSCL SCL TF TBUF TSP TR SDA THD;STA TSU;DAT THD;DAT TVD;DAT TVD;ACK TSU;STO Figure 2. I2C-Bus Timing Diagram PI7C9X762 Document Number DS40306 Rev 4-2 38 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 SDA SLAVE ADDRESS W A IOSTATE REG. A DATA A TD1 GPIOn Figure 3. Write To Output SDA SLAVE ADDRESS W A MSR REGISTER A S SLAVE ADDRESS R A DATA A IRQ# TD2 TD3 MODEM pin Figure 4. Modem Input Pin Interrupt PI7C9X762 Document Number DS40306 Rev 4-2 39 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 ACK from slave SDA SLAVE ADDRESS W A MSR REGISTER A S ACK from slave SLAVE ADDRESS R A ACK from master DATA A P IRQ# TD4 TD5 GPIOn Figure 5. GPIO Pin Interrupt Stop bit Start bit Next start bit RX TD6 IRQ# Figure 6. Receive Interrupt PI7C9X762 Document Number DS40306 Rev 4-2 40 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 SDA SLAVE ADDRESS W A A S RHR SLAVE ADDRESS R A DATA A P IRQ# TD7 Figure 7. Receive Interrupt Clear SDA SLAVE ADDRESS W A THR REGISTER A DATA A DATA A IRQ# TD8 Figure 8. Transmit Interrupt Clear PI7C9X762 Document Number DS40306 Rev 4-2 41 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 AC Electrical Characteristic - SPI-Bus Timing Specifications (Unless otherwise noted: TA = -40o to +85oC, VDD = 1.62 - 3.63V) VDD = 1.8V±10% Symbol Parameter Min. Max. VDD = 2.5V±10% Min. Max. VDD = 3.3V±10% Min. Max. Unit f SCL SPI clock frequency 18 27 33 MHz TTR CS# HIGH to SO three-state time 100 100 100 ns TCSS CS# to SCL setup time 100 100 100 ns TCSH CS# to SCL hold time 20 20 20 ns TDO SCL fall to SO valid time TDS SI to SCL setup time 6.0 5.0 4.0 ns TDH SI to SCL hold time 0 0 0 ns TCP SCL period time 56 36 30 ns TCH SCL HIGH time 28 18 15 ns TCL SCL LOW time 28 18 15 ns TCSW CS# HIGH pulse width 200 200 200 ns TD9 SPI output data valid 200 200 200 ns TD10 SPI modem output data valid 200 200 200 ns TD11 SPI transmit interrupt clear 200 200 200 ns TD12 SPI modem input interrupt clear 200 200 200 ns TD13 SPI input pin interrupt clear 200 200 200 ns TD14 SPI receive interrupt clear 200 200 200 ns PI7C9X762 Document Number DS40306 Rev 4-2 22 42 13 11 ns www.diodes.com Condition CL = 70 pF CL = 70 pF TCH + TCL May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 CS# TCSH TCSS TCL TCH TCSH TCSW SCLK TDS TDH SI TTR TDO SO Figure 9. SPI-bus Timing CS# SCLK SI R/W A3 A2 A1 A0 0 CH X D7 D6 D5 D4 D3 D2 D1 D0 TD9 GPIOx Figure 10. SPI Write MCR To DTR Output Switch PI7C9X762 Document Number DS40306 Rev 4-2 43 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 CS# SCLK SI R/W A3 A2 A1 A0 0 CH X D7 D6 D5 D4 D3 D2 D1 D0 TD10 DTR# (GPIO5) Figure 11. SPI Write MCR To DTR Output Switch CS# SCLK SI R/W A3 A2 A1 A0 0 CH X D7 D6 D5 D4 D3 D2 D1 D0 GPIOx td11 IRQ# Figure 12. SPI Write THR To Clear TX INT PI7C9X762 Document Number DS40306 Rev 4-2 44 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 CS# SCLK SI R/W A3 A2 A1 A0 0 CH X SO D7 D6 D5 D4 D3 D2 D1 D0 TD12 IRQ# Figure 13. Read MSR To Clear Modem INT CS# SCLK SI R/W A3 A2 A1 A0 0 CH X SO D7 D6 D5 D4 D3 D2 D1 D0 TD13 IRQ# Figure 14. Read IOState To Clear GPIO INT PI7C9X762 Document Number DS40306 Rev 4-2 45 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 CS# SCLK SI R/W A3 A2 A1 A0 0 CH X SO D7 D6 D5 D4 D3 D2 D1 D0 TD14 IRQ# Figure 15. Read RHR To Clear RX INT Part Marking L Package ZH Package PI7C9X762CLE PI7C9X762CZHE PI7C9X 762CLE YYWWXX YYWW: Year & Workweek 1st X: Assembly Site Code 2nd X: Fab Site Code PI7C9X762 Document Number DS40306 Rev 4-2 PI7C9X 762CZHE YYWWXX YYWW: Year & Workweek 1st X: Assembly Site Code 2nd X: Fab Site Code 46 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Packaging Mechanical: 28-TSSOP (L) 16-0076 PI7C9X762 Document Number DS40306 Rev 4-2 47 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Packaging Mechanical: 32-TQFN (ZH) 17-0570 For latest package info. please check: http://www.diodes.com/design/support/packaging/pericom-packaging/packaging-mechanicals-and-thermal-characteristics/ Ordering Information Ordering Number PI7C9X762CLEX PI7C9X762CZHEX Package Code L ZH Package Description 28-Contact, 173mil wide (TSSOP) 32-Contact, Thin Quad Flat No-Lead (TQFN) Notes: 1. EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. All applicable RoHS exemptions applied. 2. See http://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, “Green” and Lead-free. Thermal characteristics can be found on the company web site at www.diodes.com/design/support/packaging/ 3. E = Pb-free and Green 4. X suffix = Tape/Reel PI7C9X762 Document Number DS40306 Rev 4-2 48 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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Copyright © 2016, Diodes Incorporated www.diodes.com PI7C9X762 Document Number DS40306 Rev 4-2 49 www.diodes.com May 2018 Diodes Incorporated A product Line of Diodes Incorporated PI7C9X762 Revision History Date 8/14/2014 Revision 0.1 Description First Release Updated the AC Electrical Characteristic - I2C-Bus Timing Specifications Updated the SPI Bus Interface 10/21/2014 0.1 Updated the Feature Updated the Description Updated Configuration Register Updated the Maximum Rating 05/13/2015 1.0 05/25/2016 1.1 12/14/2016 1.2 06/05/2017 1.3 Remove C from part numbers except ordering information 10/20/2017 2 Revision numbering system changed to whole number Updated the Ordering Information Updated the Packaging Mechanical Chnage the revision to C Updated the Maximum Ratings Updated the Pin Configuration 32-Pin TQFN (I2C-Bus Interface) Diagram 04/27/2018 3 Updated the Ordering Information Added Part Marking 05/09/2018 PI7C9X762 Document Number DS40306 Rev 4-2 4 Updated Configuration Registers 50 www.diodes.com May 2018 Diodes Incorporated