SA3229

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Technical content

Features

• Adaptive Feedback Cancellation
• WDRC Compression with Choice of 1, 2 or 4 Channels of Compression
• Auto Telecoil with Programmable Delay
• EVOKE LITE/C0116 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 V olume Control Adjustment
• Support for Active High or Active Low Switching
• Analog or Digital V olume Control with Programmable Range
• High Quality 20−bit Audio Processing
• High Power/High Gain Capability
• Configurable Low Battery Indicator www.onsemi.com SIP25 HYBRID CASE 127DZ PAD CONNECTION MARKING DIAGRAM SA3229−E1 XXXXXX SA3229 = Specific Device Code E1 = RoHS Compliant Hybrid XXXXXX = Work Order Number (Bottom View) 8910 17 18 VIN1 TR4 TR3 TR2 TR1 N/C 25 24 VIN2 TIN DAI VC D_VC SDA CLK MS1 VREG MGND GND PGND OUT+ OUT− VBP VB MS2 N/C N/C See detailed ordering and shipping information on page 13 of this data sheet.

ORDERING INFORMATION

• Eight Biquadratic Filters
• 16 kHz or 8 kHz Bandwidth
• Four Fully Configurable Memories with Audible Memory Change Indicator
• 96 dB Input Dynamic Range with HRX 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: 0.225 x 0.125 x 0.045 in (5.72 x 3.18 x 1.14 mm)
• These Devices are Pb−Free and are RoHS Compliant

Figure 1. Hybrid Block Diagram

Table 1. ABSOLUTE MAXIMUM RATINGS 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 4 MSL. Do not open packages except under controlled conditions. Table 2. ELECTRICAL CHARACTERISTICS (Supply Voltage VB = 1.25 V; Temperature = 25°C)

100 Hz − 8 kHz

Table 2. ELECTRICAL CHARACTERISTICS (Supply Voltage VB = 1.25 V; Temperature = 25°C) (continued) performance may not be indicated by the Electrical Characteristics if operated under different conditions.

1. Times do not include additional programmable startup delay.

Table 3. I2C TIMING period, the first clock pulse is generated.

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 t HD;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 I 2C−bus device can be used in a Standard−mode I2C−bus system, but the requirement tSU;DAT P250ns must then be met.

to the Standard−mode I2C−bus specification) before the PC_CLK line is released.

1. C b = total capacitance of one bus line in pF.

www.onsemi.com SA3229 OVERVIEW SA3229 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. SA3229 can be used as a 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. SA3229 can be programmed via the SDA or I 2C programming interfaces. 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. SA3229 is an economical variant of SB3229 which utilizes the on−chip non−volatile memory on Wolverine (OTP) to offer the extended Rhythm feature set in a low−cost solution. Device settings are programmed into the OTP memory during manufacturing and fitting adjustments can be made with up to four trimmers. SA3229 and SB3229 feature identical parameter sets. Therefore, SB3229 can be used for design and development purposes. At manufacturing time, customers have the option to migrate to the cost−efficient SA3229 variant, enabling low−cost Bill−of−Materials for cost sensitive applications. SA3229 supports two times programming, which provides flexibility to rework the product, should any design changes be needed. Development of SA3229 based products is identical to the SB3229 products using identical ARK libraries. The SA3229 hybrid, however, can only be programmed in a manufacturing environment using Cal/Config. 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. FUNCTIONAL BLOCK DESCRIPTION A/D and D/A Converter 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. 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. Analog Inputs SA3229 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 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. Channel Processing Figure 4 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)

a slight decrease in the resolution of the taper. 19 hearing aid parameters through up to four trimmers. how to wire the digital volume control to SA3229. Figure 6. Wiring for Digital Volume Control configurable through IDS in the IDS setting tab. a connected switch is momentary or static. switch is dedicated to the last memory position. Table 4. MS SWITCH MODES settings tab as shown in Table 5 below. Table 5. MS SWITCH LOGIC LEVELS VS. IDS PULLUPDOWN SETTINGS

memory, a button press causes memory A to be loaded. This mode uses two static switches to change memories. Table 6. STATIC SWITCH TRUTH TABLE: This mode uses two static switches to change memories. Table 7. STATIC SWITCH TRUTH TABLE: control (VC) adjustments and/or memory selection (MS).

• Digital V olume 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.

www.onsemi.com 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. 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 SA3229 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) /C0043b0 /C0041b1 /C0032z/C00421 /C0041b2 /C0032z/C00422 1 /C0041a1 /C0032z/C00421 /C0041a2 /C0032z/C00422 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 /C00322 14) 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. Tinnitus Treatment Noise The Tinnitus Treatment noise is generated using white noise generator hardware and shaping the generated noise using four 2 nd 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. EVOKE Lite 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
• V olume Up and V olume Down
• V olume Max and V olume Min
• Low Battery Each Acoustic Indicator is made up of up to four faded tones. A faded tone exhibits a 64 ms fade−in and fade−out transition time. The duration of an Acoustic Indicator is configurable, with a maximum value of 6.35 seconds. Power Management SA3229 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

www.onsemi.com 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. Deep Reset Mode 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 . Advanced Reset Mode Advanced Reset Mode on SA3229 is a more sophisticated power management scheme than shallow and deep reset 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. Low Battery Notification 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. SDA and I2C Communication The SA3229 OTP 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 transients. Once the changes are complete, the main audio path is reactivated. 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, SA3229 is programmed via the SDA pin using industry

www.onsemi.com standard programming boxes. I 2C 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. Input Connection and Layout Considerations It is recommended to connect unused audio input pins directly to MGND to minimize the possibility of noise 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. Unused trimmer inputs should also be connected to GND.

Device Package Shipping† SA3229−E1 25 Pad Hybrid Case 127DZ

25 Units / Bubble Pack

SA3229−E1−T 25 Pad Hybrid Case 127DZ

250 Units / Tape & Reel

†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 SA3229 contact your Sales Account Manager or FAE and use part number SA3404GEVB.

Table 8. PAD POSITION AND DIMENSIONS

www.onsemi.com PACKAGE DIMENSIONS ÈÈÈ ÈÈÈ SIP25, 5.72x3.18 CASE 127DZ ISSUE O SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. COPLANARITY APPLIES TO THE SPHERICAL CROWNS OF THE PADS. DIM A MIN MAX −−− MILLIMETERS A2 −−− 1.14 e1 0.051 BSC 1.31 E D A B PIN A1 INDICATOR C 0.07 0.17 TOP VIEW SIDE VIEW A E 5.72 BSC e 0.686 BSC 0.13 C 0.13 C 0.05 C 0.13 C NOTE 3

1.092 BSC

1.067 BSC

L 0.554 0.614 L2 0.808 0.868 b 0.478 0.538 b1 0.427 0.487 D 3.18 BSC L3 0.275 0.335 23X b BOTTOM VIEW 1017 e A0.05 C NOTE 4 B 0.03 C e/2 e e/2 2X b1 DETAIL A L2e L20X DETAIL A DETAIL B 0.686 0.335 0.686 0.868 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SOLDERING FOOTPRINT* RECOMMENDED DIMENSIONS: MILLIMETERS 0.614 0.686 PITCH 1.067 DETAIL B 20X 0.487 1.092 0.051 0.538 23X BOTTOM VIEW 1017 765432 18 23 22212019 111213141516 PIN LAYOUT

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