SB3229-E1

Preconfigured DSP System for Hearings Aids RHYTHM SB3229 Description www.onsemi.com 25 PAD HYBRID CASE 127DN PAD CONNECTION 17 18 VIN1 1 VREG TIN 16 19 TR4 2 MGND DAI 15 20 TR3 3 GND VC 14 21 TR2 4 PGND D_VC 13 22 TR1 5 OUT+ SDA 12 23 N/C 6 OUT− CLK 11 7 VBP MS1 10 Features • Adaptive Feedback Cancellation • WDRC Compression with Choice of 1, 2 or 4 Channels of • • • • • • • • • • • • • Compression Auto Telecoil with Programmable Delay EVOKE Acoustic Indicators Noise Generator for Tinnitus Treatment or In−Situ Audiometry Frequency Response Shaping with Graphic EQ Trimmer Compatibility – Four Three−Terminal Trimmers with Configurable Assignments of Control Parameters I2C and SDA Programming Rocker Switch Support for Memory Change and/or Volume Control Adjustment Support for Active Hi or Active Lo Switching Analog or Digital Volume Control with Programmable Range High Quality 20−bit Audio Processing High Power/High Gain Capability SOUNDFIT Fitting Software Configurable Low Battery Indicator © Semiconductor Components Industries, LLC, 2014 March, 2021 − Rev. 7 1 25 24 N/C VIN2 N/C The RHYTHMt SB3229 hybrid from ON Semiconductor is a trimmer−configurable DSP system based on a four−channel compression circuit featuring a feedback cancellation algorithm. Based on a phase cancellation method, SB3229’s adaptive feedback reduction algorithm provides added stable gain to enable extra gain and user comfort. It features rapid adjustment for dynamic feedback situations and resistance to tonal inputs. In addition to these adaptive algorithms, SB3229 also supports the following features: up to four channel WDRC, low−distortion compression limiting, cross fading between audio paths for click−free memory changes, eight−band graphic equalizer, eight configurable generic biquad filters, programming speed enhancements, in−channel squelch to attenuate microphone and circuit noise in quiet environments, optional peak clipping, flexible compression adjustments, volume control, rocker switch, noise generation for Tinnitus treatment, and industry−leading security features to avoid cloning and software piracy. A trimmer interface supports manual circuit configuration. It continuously monitors trimmer positions and translates them into the hearing−aid parameters of choice. A Serial Data or I2C Interface provides full programmability at the factory and in the field. The SB3229 hybrid contains a 256 kbit EEPROM intended for programmable and trimmer based devices. 9 8 VB MS2 (Bottom View) MARKING DIAGRAM SB3229−E1 XXXXXX SB3229 = Specific Device Code E1 = RoHS Compliant Hybrid XXXXXX = Work Order Number ORDERING INFORMATION See detailed ordering and shipping information on page 13 of this data sheet. Publication Order Number: SB3229/D RHYTHM SB3229 • Eight Biquadratic Filters • 16 kHz or 8 kHz Bandwidth • Four Fully Configurable Memories with Audible • • • • • • • Memory Change Indicator 96 dB Input Dynamic Range with Headroom Extension 128−bit Fingerprint Security System and Other Security Features to Protect Against Device Cloning and Software Piracy • High Fidelity Audio CODEC Soft Acoustic Fade between Memory Changes Drives Zero−Bias Two−Terminal Receivers E1 RoHS−compliant Hybrid Hybrid Typical Dimensions: 0.220 x 0.125 x 0.060 in (5.59 x 3.18 x 1.52 mm) These Devices are Pb−Free and are RoHS Compliant BLOCK DIAGRAM MS2 MS1 9 SDA VB CLK 12 10 11 8 PROGRAMMING INTERFACE VREG 1 REGULATOR MIC1 18 A/D MIC2 17 TIN 16 DAI 15 MGND 2 FEEDBACK CANCELLER TONE GENERATOR A/D + PRE BIQUAD FILTERS 1−4 POST BIQUAD FILTERS 3&4 1, 2 or 4 CHANNEL WDRC AGC−O POST BIQUAD FILTERS 1&2 VC GAIN WIDEBAND GAIN MIC / TELECOIL COMPENSATION CROSS FADER D/A HBRIDGE PEAK CLIPPING EVOKE NOISE GENERATOR TRIMMER/VC INTERFACE BIQUAD 1−4 SB3229 13 14 22 21 20 19 3 D_VC VC TR1 TR2 TR3 TR4 GND Figure 1. Hybrid Block Diagram www.onsemi.com 2 7 VBP 5 OUT+ 6 OUT − 4 PGND RHYTHM SB3229 SPECIFICATIONS Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Value Units 0 to +40 °C −20 to +70 °C 25 mW Maximum Operating Supply Voltage 1.65 VDC Absolute Maximum Supply Voltage 1.8 VDC Operating Temperature Range Storage Temperature Range Absolute Maximum Power Dissipation Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. WARNING: Electrostatic Sensitive Device − Do not open packages or handle except at a static−free workstation. WARNING: Moisture Sensitive Device − RoHS Compliant; Level 3 MSL. Do not open packages except under controlled conditions. Table 2. ELECTRICAL CHARACTERISTICS (Supply Voltage VB = 1.25 V; Temperature = 25°C) Parameter Hybrid Current Symbol Conditions Min Typ Max Units IAMP All functions, 32 kHz sampling rate − 640 − mA All functions, 16 kHz sampling rate − 535 − Ramp down, audio path 0.93 0.95 0.97 Ramp down, control logic 0.77 0.80 0.83 VBON Ramp up 1.06 1.10 1.16 V EEPROM Burn Cycles − − 100 k − − cycles Low Frequency System Limit − − − 125 − Hz Minimum Operating Supply Voltage Supply Voltage Turn On Threshold High Frequency System Limit VBOFF V − − − 16 − kHz THD VIN = −40 dBV − − 1 % THDM VIN = −15 dBV, Headroom Extension − ON − − 3 % fCLK − 3.973 4.096 4.218 MHz − 8 kHz bandwidth − 4.2 − ms − 16 kHz bandwidth − 4.0 − − SB3229 − 1600 − ms VREG − 0.87 0.90 0.93 V PSRRSYS 1 kHz, Input referred, Headroom Extension enabled − 70 − dB Input Referred Noise IRN Bandwidth 100 Hz − 8 kHz, Headroom Extension on − −108 −106 dBV Input Impedance ZIN 1 kHz − 3 − MW Anti−aliasing Filter Rejection − f = fCLK/2 − 8 kHz, VIN = −40 dBV − 80 − dB Crosstalk − Between both A/D and Mux − 60 − dB Maximum Input Level − − −15 −13 − dBV VAN_IN VIN1, VIN2, Al 0 − 800 mV VAN_TIN TIN −100 − 800 − Headroom Extension − ON Bandwidth 100 Hz − 8 kHz − 95 96 Total Harmonic Distortion THD at Maximum Input Clock Frequency Audio Path Latency System Power On Time (Note 1) REGULATOR Regulator Voltage System PSRR INPUT Analogue Input Voltage Range Input Dynamic Range www.onsemi.com 3 dB RHYTHM SB3229 Table 2. ELECTRICAL CHARACTERISTICS (Supply Voltage VB = 1.25 V; Temperature = 25°C) (continued) Parameter Symbol Conditions Min Typ Max Units − 100 Hz − 8 kHz − 88 − dB ZOUT − − 10 13 W Resolution (monotonic) − − 7 − − bits Zero Scale Level − − − 0 − V Full Scale Level − − − VREG − V RVC Three−terminal connection 100 − 360 kW − − − − 42 dB Logic 0 Voltage − − 0 − 0.3 V Logic 1 Voltage − − 1 − 1.25 V Stand−by Pull Up Current − Creftrim = 6 3 5 6.5 mA Sync Pull Up Current − Creftrim = 6 748 880 1020 mA Max Sync Pull Up Current − Creftrim = 15 − 1380 − mA Min Sync Pull Up Current − Creftrim = 0 − 550 − mA Logic 0 Current (Pull Down) − Creftrim = 6 374 440 506 mA Logic 1 Current (Pull Up) − Creftrim = 6 374 440 506 mA TSYNC Baud = 0 237 250 263 ms Baud = 1 118 125 132 OUTPUT D/A Dynamic Range Output Impedance CONTROL A/D VOLUME CONTROL Volume Control Resistance Volume Control Range PC_SDA INPUT PC_SDA OUTPUT Synchronization Time (Synchronization Pulse Width) Baud = 2 59 62.5 66 Baud = 3 29.76 31.25 32.81 Baud = 4 14.88 15.63 16.41 Baud = 5 7.44 7.81 8.20 Baud = 6 3.72 3.91 4.10 Baud = 7 1.86 1.95 2.05 Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 1. Times do not include additional programmable startup delay. www.onsemi.com 4 RHYTHM SB3229 Table 3. I2C TIMING Standard Mode Fast Mode Symbol Min Max Min Max Units Clock Frequency fPC_CLK 0 100 0 400 kHz Hold time (repeated) START condition. After this period, the first clock pulse is generated. tHD;STA 4.0 − 0.6 − msec LOW Period of the PC_CLK Clock tLOW 4.7 − − − msec HIGH Period of the PC_CLK Clock tHIGH 4.0 − − − msec Set−up time for a repeated START condition tSU;STA 4.7 − − − msec Data Hold Time: for CBUS Compatible Masters for I2C−bus Devices tHD;DAT 5.0 0 (Note 1) − 3.4 (Note 2) − 0 (Note 1) − 0.9 (Note 2) Data set−up time tSU;DAT 250 − 100 − nsec Rise time of both PC_SDA and PC_CLK signals tr − 1000 20 + 0.1 Cb (Note 4) 300 nsec Fall time of both PC_SDA and PC_CLK signals tf − 300 20 + 0.1 Cb (Note 4) 300 nsec tSU;STO 4.0 − 0.6 − nsec tBUF 4.7 − 1.3 − msec Output fall time from VIHmin to VILmax with a bus capacitance from 10 pF to 400 pF tof − 250 20 + 0.1 Cb (Note 4) 250 nsec Pulse width of spikes which must be suppressed by the input filter tSP n/a n/a 0 50 nsec Capacitive load for each bus line Cb − 400 − 400 pF Parameter Set−up time for STOP condition Bus free time between a STOP and START condition msec 1. A device must internally provide a hold time of at least 300 ns for the PC_SDA signal to bridge the undefined region of the falling edge of PC_CLK. 2. The maximum tHD;DAT has only to be met if the device does not stretch the LOW period (tLOW) of the PC_CLK signal. 3. A Fast−mode I2C−bus device can be used in a Standard−mode I2C−bus system, but the requirement tSU;DAT P250ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the PC_CLK signal. If such a device does stretch the LOW period of the PC_CLK signal, it must output the next data bit to the PC_SDA line tr max + tSU;DAT = 1000 + 250 = 1250 ns (according to the Standard−mode I2C−bus specification) before the PC_CLK line is released. 4. Cb = total capacitance of one bus line in pF. www.onsemi.com 5 RHYTHM SB3229 TYPICAL APPLICATIONS VB 9 12 10 11 8 PROGRAMMING INTERFACE 1 REGULATOR FEEDBACK CANCELLER TONE GENERATOR 3k9 A/D 18 + 17 A/D 16 1k 1, 2 or 4 CHANNEL WDRC AGC−O POST BIQUAD FILTERS 1&2 VC GAIN WIDEBAND GAIN MIC / TELECOIL COMPENSATION 7 OUT POST BIQUAD FILTERS 3&4 PRE BIQUAD FILTERS 1−4 5 D/A HBRIDGE PEAK CLIPPING CROSS FADER 6 4 EVOKE 15 LP FILTER 2 NOISE GENERATOR TRIMMER/VC INTERFACE SB3229 14 13 22 20 21 BIQUAD 1−4 19 3 Note: All resistors in ohms and all capacitors in farads, unless otherwise stated. Figure 2. Test Circuit VB MS2 MS To Programming box 9 12 10 8 11 PROGRAMMING INTERFACE 1 REGULATOR FEEDBACK CANCELLER TONE GENERATOR A/D 18 + PRE BIQUAD FILTERS 1−4 17 A/D 16 POST BIQUAD FILTERS 3&4 1, 2 or 4 CHANNEL WDRC AGC−O POST BIQUAD FILTERS 1&2 VC GAIN WIDEBAND GAIN MIC / TELECOIL COMPENSATION CROSS FADER 7 D/A HBRIDGE PEAK CLIPPING 2 NOISE GENERATOR TRIMMER/VC INTERFACE SB3229 13 14 22 21 20 BIQUAD 1−4 19 3 VC 200 k Note: All resistors in ohms and all capacitors in farads, unless otherwise stated. Figure 3. Typical Programmable Application Circuit www.onsemi.com 6 6 4 EVOKE 15 5 RHYTHM SB3229 TYPICAL APPLICATIONS (continued) VB Reed Switch For Autotcoil 22 MS 47μ 9 12 10 11 8 PROGRAMMING INTERFACE 1 REGULATOR FEEDBACK CANCELLER TONE GENERATOR 18 A/D + PRE BIQUAD FILTERS 1−4 17 A/D 16 1, 2 or 4 CHANNEL WDRC MIC / TELECOIL COMPENSATION POST BIQUAD FILTERS 3&4 CROSS FADER 7 D/A HBRIDGE PEAK CLIPPING 6 AGC−O 4 EVOKE 15 POST BIQUAD FILTERS 1&2 5 VC GAIN WIDEBAND GAIN 2 NOISE GENERATOR TRIMMER/VC INTERFACE SB3229 13 14 22 VC 21 TR1 20 BIQUAD 1−4 19 TR2 TR3 3 TR4 Note: All resistors in ohms and all capacitors in farads, unless otherwise stated. Figure 4. Typical Trimmer Application Circuit SB3229 OVERVIEW The DSP core implements Adaptive Feedback Cancellation, compression, wideband gain, and volume control. The Adaptive Feedback Canceller reduces acoustic feedback while offering robust performance against pure tones. During trimmer mode operation, a low−speed A/D circuit monitors the positions of up to four manual trimmers and a VC potentiometer. Trimmer position changes are immediately interpreted and translated into new circuit parameter values, which are then used to update the signal path. SB3229 is a DSP system implemented on ON Semiconductor’s Wolverine hardware platform. Wolverine is the hearing industry’s first 90 nm Silicon−on−Chip platform enabling design of highly−efficient and flexible hearing aid solutions. The device is packaged for easy integration into a wide range of applications from CIC to BTE. SB3229 can be used as a programmable or trimmer adjustable device. It may be configured as one, two or four channels with linear or WDRC processing. Configuration data stored in non−volatile memory defines hearing−aid parameters. SB3229 can be programmed via the SDA or I2C programming interfaces. FUNCTIONAL BLOCK DESCRIPTION A/D and D/A Converter The D/A is comprised of a digital 3rd−order sigma−delta modulator and an H−bridge. The modulator accepts PCM audio data from the DSP path and converts it into a 64−times oversampled, 1−bit PDM data stream, which is then supplied to the H−bridge. The H−bridge is a specialized CMOS output driver used to convert the 1−bit data stream into a low−impedance, differential output voltage waveform suitable for driving zero−biased hearing aid receivers. The system’s A/D converter is a 2nd−order sigma−delta modulator operating at a 2.048 MHz sample rate. The system’s input is pre−conditioned with anti−alias filtering and a programmable gain pre−amplifier. The analog output is oversampled and modulated to produce a 1−bit pulse density modulated (PDM) data stream. The digital PDM data is then decimated down to pulse−code modulated (PCM) digital words at the system’s sampling rate of 32 kHz. www.onsemi.com 7 RHYTHM SB3229 Analog Inputs During the Parameter Map creation, constraints are applied to the compression parameters to ensure that the I/O characteristics are continuous. Parameter adjustments support two popular styles of compression ratio adjustment: • The compression region of the I/O curve pivots about the upper threshold. As the compression ratio trimmer is adjusted, high−level gain remains constant while the low−level gain changes. • The compression region of the I/O curve pivots about the lower threshold. Low−level gain remains constant as the compression ratio trimmer is adjusted. SB3229 provides for up to four analog inputs, Microphone 1 (MIC1), Microphone 2 (MIC2), Telecoil (TCOIL) and Direct Audio Input (DAI) with the following configurable front end modes: • MIC1 • MIC2 • DAI • TCOIL • MIC1 + TCOIL • MIC1 + DAI The squelch region within each channel implements a low level noise reduction scheme (1:3 expansion) for listener comfort. This scheme operates in quiet listening environments (programmable threshold) to reduce the gain at very low levels. Attenuation can be applied to the MIC1 input when mixing with either TCOIL or DAI inputs. Analog input signals should be ground referenced to MGND. (Microphones, telecoils, DAI). MGND is internally connected to GND to minimize noise, and should not be connected to any external ground point. Automatic Telecoil The automatic telecoil feature in SB3229 is to be used with memory D programmed with the telecoil or MIC + TCOIL front end configuration. The feature enables the part to transition to memory D upon the closing of a switch connected to MS2. With the feature enabled and a reed switch connected to MS2, the static magnetic field of a telephone handset will close the switch whenever the handset is brought close to the device, causing the hybrid to change to memory D. The part will transition back to the initial memory once the switch is deemed opened after proper debouncing. A debounce algorithm with a programmable debounce period is used to prevent needless switching in and out of memory D due to physical switch bounces when MS2 is configured for automatic telecoil. Upon detecting a close to open switch transition, the debounce algorithm monitors the switch status. The debounce algorithm switches the device out of memory D only once the switch signal has been continuously sampled open over the specified debounce period. Channel Processing Figure 5 represents the I/O characteristic of independent AGC channel processing. The I/O curve can be divided into four main regions: • Low input level expansion (squelch) region • Low input level linear region • Compression region • High input level linear region (return to linear) 0 High Level Gain OUTPUT LEVEL (dBV) −10 −20 −30 Low Level −40 Gain −50 −60 −70 −80 Compression Ratio Lower Threshold Upper Threshold Squelch Threshold −90 −100 −120 −110 −100 −90 −80 −70 −60 −50 −40 −30 −20 INPUT LEVEL (dBV) Adaptive Feedback Canceller The Adaptive Feedback Canceller (AFC) reduces acoustic feedback by forming an estimate of the hearing aid feedback signal and then subtracting this estimate from the hearing aid input. The forward path of the hearing aid is not affected. Unlike adaptive notch filter approaches, SM3229’s AFC does not reduce the hearing aid’s gain. The AFC is based on a time−domain model of the feedback path. The third−generation AFC (see Figure 6) allows for an increase in the stable gain1 of the hearing instrument while minimizing artefacts for music and tonal input signals. As with previous products, the feedback canceller provides completely automatic operation. Figure 5. Independent Channel I/O Curve Flexibility Channel I/O processing is specified by the Squelch threshold (SQUELCHTH) and any four of the following five parameters (only four of the five properties are independent): • Low level gain (LLGAIN) • Lower threshold (LTH) • High level gain (HLGAIN) • Upper threshold (UTH) • Compression ratio (CR) 1. Added stable gain will vary based on hearing aid style and acoustic setup. Please refer to the Adaptive Feedback Cancellation Information note for more details www.onsemi.com 8 RHYTHM SB3229 Feedback path + − Crossover Frequency, Lower Threshold, Upper Threshold, EQ Gain, Squelch Threshold, High Level Gain, Low Level Gain, AGC−O Threshold, Static Volume Control and Peak Clipper Threshold. H G Σ Digital Volume Control The digital volume control makes use of two pins for volume control adjustment, VC and D_VC, with momentary switches connected to each. Closure of the switch to the VC pin indicates a gain increase while closure to the D_VC pin indicates a gain decrease. Figure 7 shows how to wire the digital volume control to SB3229. H’ Estimated feedback Figure 6. Adaptive Feedback Canceller (AFC) Block Diagram Volume Control, Trimmers and Switches GND External Volume Control The volume of the device can either be set statically via software or controlled externally via a physical interface. SB3229 supports both analog and digital volume control functionality, although only one can be enabled at a time. Digital control is supported with either a momentary switch or a rocker switch. In the latter case, the rocker switch can also be used to control memory selects. VC D_VC Analog Volume Control Figure 7. Wiring for Digital Volume Control Both the external (analog) volume control and trimmers work with a three−terminal 100 kW – 360 kW variable resistor. The volume control can have either a log or linear taper, which is selectable via software. It is possible to use a VC with up to 1 MW of resistance, but this could result in a slight decrease in the resolution of the taper. Memory Select Switches One or two, two−pole Memory Select (MS) switches can be used with SB3229. This enables user’s tremendous flexibility in switching between configurations. Up to four memories can be configured and selected by the MS switches on SB3229. Memory A must always be valid. The MS switches are either momentary or static and are fully configurable through IDS in the IDS setting tab. The behavior of the MS switches is controlled by two main parameters in IDS: MSSmode: this mode determines whether a connected switch is momentary or static. Donly: this parameter determines whether the MS2 switch is dedicated to the last memory position. Trimmers The trimmer interface provides the ability to control up to 19 hearing aid parameters through up to four trimmers. A single trimmer parameter can have up to 16 values and a single trimmer can control multiple parameters (e.g., Trimmer 1 can control compression ratio in all four channels simultaneously). The trimmer must be three−terminal 100 kW to 360 kW variable resistors and have a linear taper. Parameters that can be assigned to trimmers include Low Cut, High Cut, Compression Ratio, Wideband Gain, Tinnitus (Noise Level, Low Cut Filter, High Cut Filter) There are four basic MS switch modes of operation as shown in Table 4 below. Table 4. MS SWITCH MODES MS Switch Mode MS1 Switch MS2 Switch Max # of Valid Memories Donly MSSMode Use Mode 1 Momentary None 4 Off Momentary Simplest configuration Mode 2 Momentary Static 4 On Momentary Jump to last memory Mode 3 Static Static 4 Off Static Binary selection of memory Mode 4 Static Static 3 On Static Jump to last memory The flexibility of the MS switches is further increased by allowing the MS switches to be wired to GND or VBAT, corresponding to an active low or active high logic level on the MS pins. This option is configured with the MSPullUpDown/MS2PullUpDown setting in the IDS settings tab as shown in Table 5 below. www.onsemi.com 9 RHYTHM SB3229 Table 5. MS SWITCH LOGIC LEVELS VS. IDS PULLUPDOWN SETTINGS “PullUpDown” Setting in IDS MS Switch State MS Input Logic Level Switch Connection Pulldown CLOSED HI To VBAT Pulldown OPEN LOW To VBAT Pullup CLOSED LOW To GND Pullup OPEN HI To GND transitions to an intermediate memory before reaching the final memory. The part starts in whatever memory the switches are selecting. If a memory is invalid, the part defaults to memory A. In the following mode descriptions, it is assumed that the PullUpDown setting has been properly configured for the MS switch wiring so that a CLOSED switch state is at the correct input logic level. Mode 1: Momentary Switch on MS1 Table 6. STATIC SWITCH TRUTH TABLE: D−ONLY DISABLED This mode uses a single momentary switch on MS1 input to change memories. Using this mode causes the part to start in memory A, and whenever the button is pressed, the next valid memory is loaded. When the user is in the last valid memory, a button press causes memory A to be loaded. Thus, the possible selection sequences are: If 4 valid memories: ABCDABCDA… If 3 valid memories: ABCABCA… If 2 valid memories: ABABA… If 1 valid memory: AAA… Binary State (MS1/MS2) Selected Memory OPEN OPEN Memory A CLOSED OPEN Memory B OPEN CLOSED Memory C CLOSED CLOSED Memory D Mode 4: Static Switch on MS1, Static Switch on MS2 (D−only, Jump to Last Memory) This mode uses two static switches to change memories. Similar to the behaviour described in the Static Switch on MS1 and MS2 section, this mode will switch to memory D if the static switch on MS2 is CLOSED (the state of the switch on MS1 is ignored). The mode, however, supports a maximum of three memories (even if four valid memories are programmed). This mode can be used to support the Automatic Telecoil feature (see the Automatic Telecoil section). In this mode, it is possible to jump from any memory to any other memory by changing the state of both switches. If the two switches are changed one after the other, the part transitions to an intermediate memory before reaching the final memory. The part starts in whatever memory the switches are selecting. If a memory is invalid, the part defaults to memory A. Mode 2: Momentary Switch on MS1, Static Switch on MS2 (D−only, Jump to Last Memory) This mode uses a static switch on MS2 and a momentary switch on MS1 to change memories. It can be used to support the Automatic Telecoil feature, see section Automatic Telecoil. If the static switch on MS2 is OPEN, the part starts in memory A and is controlled by the momentary switch on MS1 as described in section Momentary Switch on MS1, with the exception that memory D is not used. If the static switch on MS2 is set to CLOSED, the part automatically jumps to memory D (occurs on startup or during normal operation). In this setup, the state of the momentary switch on MS1 is ignored. When MS2 is set to OPEN, the part loads in the memory that was active prior to jumping to memory D. The possible memory selection sequences are: If MS2 = OPEN and there are four valid memories, MS1 selects: ABCABCA… If MS2 = OPEN and there are three valid memories, MS1 selects: ABABA… If MS2 = OPEN and there is one valid memory: A If MS2 = CLOSED: D Table 7. STATIC SWITCH TRUTH TABLE: D−ONLY ENABLED; (EXAMPLE WITH THREE VALID MEMORIES) Binary State (MS1/MS2) Selected Memory OPEN OPEN Memory A CLOSED OPEN Memory B X CLOSED Memory D Mode 3: Static Switch on MS1 and MS2 This mode uses two static switches to change memories. In this mode, it is possible to jump from any memory to any other memory by changing the state of both switches. If the two switches are changed one after the other, the part Rocker Switch Support The device supports connection of a rocker switch to the digital volume control interface that can perform volume control (VC) adjustments and/or memory selection (MS). www.onsemi.com 10 RHYTHM SB3229 There are three modes of operation: After designing a filter, the quantized coefficients can be entered into the PreBiquads or PostBiquads tab in the Interactive Data Sheet. The coefficients b0, b1, b2, a1, and a2 are as defined in the transfer function above. The parameters meta0 and meta1 do not have any effect on the signal processing, but can be used to store additional information related to the associated biquad. The underlying code in the product components automatically checks all of the filters in the system for stability (i.e., the poles have to be within the unit circle) before updating the graphs on the screen or programming the coefficients into the hybrid. If the Interactive Data Sheet receives an exception from the underlying stability checking code, it automatically disables the biquad being modified and displays a warning message. When the filter is made stable again, it can be re−enabled. Also note that in some configurations, some of these filters may be used by the product component for microphone/telecoil compensation, low−frequency EQ, etc. If this is the case, the coefficients entered by the user into IDS are ignored and the filter designed by the software is programmed instead. For more information on filter design refer to the Biquad Filters In PARAGON® Digital Hybrid information note. • Digital Volume Control Mode • Momentary Memory Select Mode • Mixed Mode (VC and MS) In Digital VC mode, the rocker switch provides the digital volume control functionality as described in this section. In Momentary Memory Select mode, the rocker switch allows cycling through the memory profiles in both directions. An “up” switch closure indicates a program advance to the next higher numbered memory and “down” switch closures indicates a program retreat to the next lower numbered memory. In this mode, volume control is only available through software control. In Mixed Mode, operation of the switch as a volume control or memory select is governed by the time duration of the switch closure: either short or long. The discrimination of short and long pulses is set by a programmable, time−threshold value, from 1 s to 5 s in 1 s increments. An additional programmable parameter determines whether the short pulses refer to volume−control operation or memory−select operation. If long pulses control memory select operation, the memory change is initiated once the switch is held for the long pulse period without requiring the switch to be released. In Digital VC mode or Momentary Memory Select mode, the action takes place after the switch is released. Tinnitus Treatment Noise The Tinnitus Treatment noise is generated using white noise generator hardware and shaping the generated noise using four 2nd order biquadratic filters. The filter parameters are the same coefficients as those presented in the Biquadratic Filters section. The Tinnitus Treatment noise can be added into the signal path at two possible locations: before the VC (before the AGC−O, but compensated for the Wideband Gain) or after the VC (between the last generic biquad and the Cross Fader). If the noise is injected before the VC then the level of the noise will change along with the rest of the audio through the device when the VC is adjusted. If the noise is injected after the VC it is not affected by VC changes. AGC−O The AGC−O module is an output limiting circuit with a fixed compression ratio of ∞ : 1. The limiting level is programmable as a level measured in dB from full scale. The maximum output of the device is 0 dBFS. The AGC−O module has its own level detector, with programmable attack and release time constants. Graphic Equalizer SB3229 has a 8−band graphic equalizer. Each band provides up to 24 dB of gain adjustment in 1 dB increments. Biquadratic Filters Additional frequency shaping can be achieved by configuring generic biquad filters. The transfer function for each of the biquad filters is as follows: H(z) + b0 ) b1 1 ) a1 z *1 ) b2 z *1 ) a2 EVOKE Acoustic Indicators Ten Acoustic Indicators are available for indicating events. Each indicator is fixed to a particular event. Any event can have its assigned indicator enabled or disabled although not always independently. Individual enable/ disable control is provided for the following event or group of events: • Power on reset (POR) • Four memory selects • Volume Up and Volume Down • Volume Max and Volume Min • Low Battery z *2 z *2 NOTE: The a0 coefficient is hard−wired to always be ‘1’. The coefficients are each 16 bits in length and formatted as one sign bit, one integer bit and 14 fractional bits. This maps onto a decimal range of −2.0 to 2.0 before quantization (−32767 to 32767 after quantization). Thus, before quantization, the floating−point coefficients must be in the range −2.0 ≤ x < 2.0 and quantized with the function: round(x Each Acoustic Indicator is made up of up to four faded tones. A faded tone exhibits a 64 ms fade−in and fade−out 2 ) 14 www.onsemi.com 11 RHYTHM SB3229 modes. This mode attempts to maximize the device’s usable battery life by reducing the gain to stabilize the supply based on the instantaneous and average supply voltage levels. Instantaneous supply fluctuations below 0.95 V can trigger up to two 3 dB, instantaneous gain reductions. Average supply drops below 0.95 V can trigger up to eighteen, 1 dB average gain reductions. While the average supply voltage is above 0.95 V, an instantaneous supply voltage fluctuation below 0.95 V will trigger an immediate 3 dB gain reduction. After the 3 dB gain reduction has been applied, the advanced reset model holds off checking the instantaneous voltage level for a monitoring period of 30 second in order to allow the voltage level to stabilize. If after the stabilization time the instantaneous voltage drops a second time below 0.95 V during the next monitoring period, the gain will be reduced an additional 3 dB for a 6 dB total reduction and a 30 second stabilization time is activated. The advanced reset mode continues to monitor the instantaneous voltage levels over 30 second monitoring periods. If the instantaneous voltage remains above 1.1 V during that monitoring period, the gain will be restored to the original setting regardless of whether one or two gain reductions are applied. If two gain reductions are applied and the instantaneous voltage level remains above 1.0 V for a monitoring period, the gain will be restored to a 3 dB reduction. Should the average supply voltage drop below 0.95 V, the device will then reduce the gain by 1 dB every 10 seconds until either the average supply voltage rises above 0.95 V or a total of 18 average gain reductions have been applied, at which point the audio path will be muted. If the average supply voltage returns to a level above 1.1 V, the audio path will first be un−muted, if required. The gain will then be increased by 1 dB every 10 seconds until either the average supply voltage drops below 1.1 V, or all average gain reductions have been removed. No action is taken while the average supply voltage resides between 0.95 V and 1.1 V. NOTE: Instantaneous and average gain reductions are adjusted independently. When the instantaneous voltage falls below the hardware shutdown voltage, the device will undergo a hardware reset. When it turns back on because the voltage has risen above the turn−on threshold of 0.6 V, it will behave the same as it would in shallow reset mode. transition time. The duration of an Acoustic Indicator is configurable, with a maximum value of 6.35 seconds. Power Management SB3229 has three user−selectable power management schemes to ensure the hearing aid dies gracefully at the end of battery life. Shallow reset, Deep reset and Advanced Reset mode. It also contains a programmable power on reset delay function. Power On Reset Delay The programmable POR delay controls the amount of time between power being connected to the hybrid and the audio output being enabled. This gives the user time to properly insert the hearing aid before the audio starts, avoiding the temporary feedback that can occur while the device is being inserted. During the delay period, momentary button presses are ignored. Power Management Functionality As the voltage on the hearing aid battery decreases, an audible warning is given to the user indicating the battery life is low. In addition to this audible warning, the hearing aid takes other steps to ensure proper operation given the weak supply. The exact hearing aid behaviour in low supply conditions depends on the selected POR mode. The hearing aid has three POR modes: • Shallow Reset Mode • Deep Reset Mode • Advanced Mode Shallow Reset Mode In Shallow Reset mode, the hearing aid will operate normally when the battery is above 0.95 V. Once the supply voltage drops below 0.95 V the audio will be muted and remain in that state until the supply voltage rises above 1.1 V. Once the supply voltage drops below the control logic ramp down voltage, the device will undergo a hardware reset. At this point, the device will remain off until the supply voltage returns to 1.1 V. When the supply voltage is below the control logic voltage, but above 0.6 V and rises above the 1.1 V turn on threshold, the device will activate its output and operate from the memory that was active prior to reset. If the supply voltage drops below 0.6 V, and rises above the 1.1 V turn on threshold, the device will reinitialize, activate its output and operate from memory A. Low Battery Notification Deep Reset Mode Notification of the low battery condition via an acoustic indicator is optionally performed when the battery voltage drops below a configurable low battery notification threshold. The low battery indicator is repeated every five minutes until the device shuts down. In Deep Reset mode, the hearing aid will operate normally when the battery is above 0.95 V. Once the supply voltage drops below 0.95 V the audio will be muted. The device remains in this state until the supply voltage drops below the hardware reset voltage of 0.6 V. When this occurs, the device will load memory A and operate normally after the supply voltage goes above 1.1 V. SDA and I2C Communication SB3229 can be programmed using the SDA or I2C protocol. During parameter changes, the main audio signal path of the hybrid is temporarily muted using the memory switch fader to avoid the generation of disturbing audio Advanced Reset Mode Advanced Reset Mode on SB3229 is a more sophisticated power management scheme than shallow and deep reset www.onsemi.com 12 RHYTHM SB3229 transients. Once the changes are complete, the main audio path is reactivated. Any changes made during programming are lost at power−off unless they are explicitly burned to EEPROM memory. Improvements have been made to the ARK software, resulting in improved communication speed. Certain parameters in ARKonline® can be selected to reduce the number of pages that need to be read out. In SDA mode, SB3229 is programmed via the SDA pin using industry standard programming boxes. I2C mode is a two−wire interface which uses the SDA pin for bidirectional data and CLK as the interface clock input. I2C programming support is available on the HiPro (serial or USB versions) and ON Semiconductor’s DSP Programmer 3.0. pickup. Inputs are internally AC coupled, so there is no additional leakage current when inputs are connected directly to ground. In order to further minimize noise at the inputs the following guidelines are recommended: • MGND is used as reference ground plane for input signals. All input components should be grounded to MGND. This ground plane should be isolated from all other ground connections in the system. • Keep the input traces as short as possible and avoid routing traces near high noise sources such as the OUT+ and OUT− pins • Star ground input component grounds to the MGND connection. Input Connection and Layout Considerations Unused trimmer inputs should also be connected to GND. It is recommended to connect unused audio input pins directly to MGND to minimize the possibility of noise ORDERING INFORMATION Package Shipping† SB3229−E1 25 Pad Hybrid Case 127DN 25 Units / Bubble Pack SB3229−E1−T 25 Pad Hybrid Case 127DN 250 Units / Tape & Reel Device †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Hybrid Jig Ordering Information To order a Hybrid Jig Evaluation Board for SB3229 contact your Sales Account Manager or FAE and use part number SA3405GEVB. www.onsemi.com 13 RHYTHM SB3229 PAD LOCATIONS Table 8. PAD POSITION AND DIMENSIONS Pad Position Pad Dimension Pad No. X Y Xdim (mil) Ydim (mil) 1 0 0 20 33 2 −27 0 20 33 3 −54 5 20 23 4 −81 5 20 23 5 −108 5 20 23 6 −135 5 20 23 7 −162 5 20 23 8 −189 0 20 33 9 −189 42 20 23 10 −189 85 20 23 11 −162 85 20 23 12 −135 85 20 23 13 −108 85 20 23 14 −81 85 20 23 15 −54 85 20 23 16 −27 85 20 23 17 0 85 20 23 18 0 42 20 23 19 −27 42 20 23 20 −54 42 20 23 21 −81 42 20 23 22 −108 42 20 23 23 −135 42 20 23 24 −162 26.5 18 12 25 −162 53.5 18 12 www.onsemi.com 14 RHYTHM SB3229 Table 8. PAD POSITION AND DIMENSIONS Pad No. X Y Xdim (mm) Ydim (mm) 1 0 0 0.508 0.838 2 −0.686 0 0.508 0.838 3 −1.372 0.127 0.508 0.584 4 −2.057 0.127 0.508 0.584 5 −2.743 0.127 0.508 0.584 6 −3.429 0.127 0.508 0.584 7 −4.115 0.127 0.508 0.584 8 −4.801 0 0.508 0.838 9 −4.801 1.067 0.508 0.584 10 −4.801 2.159 0.508 0.584 11 −4.115 2.159 0.508 0.584 12 −3.429 2.159 0.508 0.584 13 −2.743 2.159 0.508 0.584 14 −2.057 2.159 0.508 0.584 15 −1.372 2.159 0.508 0.584 16 −0.686 2.159 0.508 0.584 17 0 2.159 0.508 0.584 18 0 1.067 0.508 0.584 19 −0.686 1.067 0.508 0.584 20 −1.372 1.067 0.508 0.584 21 −2.057 1.067 0.508 0.584 22 −2.743 1.067 0.508 0.584 23 −3.429 1.067 0.508 0.584 24 −4.115 0.673 0.457 0.305 25 −4.115 1.359 0.457 0.305 RHYTHM is a trademarks of Semiconductor Components Industries, LLC. www.onsemi.com 15 MECHANICAL CASE OUTLINE PACKAGE DIMENSIONS SIP25, 5.59x3.18 CASE 127DN ISSUE A SCALE 2:1 DATE 21 JUL 2020 GENERIC MARKING DIAGRAM* XXXXXXXXXX ZZZZZZ XX = Specific Device Code ZZ = Lot Traceability DOCUMENT NUMBER: DESCRIPTION: 98AON89696F SIP25, 5.59x3.18 *This information is generic. Please refer to device data sheet for actual part marking. Pb−Free indicator, “G” or microdot “G”, may or may not be present. Some products may not follow the Generic Marking. Electronic versions are uncontrolled except when accessed directly from the Document Repository. Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red. PAGE 1 OF 1 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. ON Semiconductor does not convey any license under its patent rights nor the rights of others. © Semiconductor Components Industries, LLC, 2018 www.onsemi.com onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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