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? semiconductor components industries, llc, 2016 june, 2016 ? rev. 6 1 publication order number: R3710/d rhythm R3710 preconfigured dsp system description rhythm R3710 is a preconfigured dsp system designed specifically for invisible?in?canal (iic) hearing aid devices. available in the industry?s smallest hybrid form?factors, it is well suited for hearing aid designs that are placed deep in the ear canal. using miniaturized advanced packaging techniques, on semiconductor enables hearing aid manufacturers to take advantage of the highly compact size to produce iic hearing aids that fit a greater portion of the market. featuring iscenedetect environmental classification, adaptive noise reduction, feedback cancellation, and up to 8?channel wdrc, R3710 provides the advanced features and performance level typically found in high?end products. acoustic environment classification ? the iscenedetect environmental classification algorithm is capable of analyzing the hearing aid user?s acoustic environment and automatically optimizes the hearing aid to maximize comfort and audibility. ilog 6.0 datalogging ? enables the recording of various hearing aid parameters such as program selection, volume setting and ambient sound levels. the sampling interval can be configured to record from every 4 seconds up to once every 60 minutes. the fitting system can present the data to help the fitting specialist fine tune the hearing aid and counsel the wearer during follow up visits. evoke advanced acoustic indicators ? allows manufacturers to provide more pleasing, multi?frequency tones simulating musical notes or chords to indicate events such as program or volume changes. adaptive feedback canceller ? automatically reduces acoustic feedback and allows for an increase in the stable gain while minimizing artifacts for music and tonal input signals. adaptive noise reduction ? the adaptive noise reduction algorithm on R3710 monitors noise levels independently in 128 individual bands and employs advanced psychoacoustic models to provide user comfort. tinnitus masking ? R3710 is equipped with a noise source that can be used to mask tinnitus. the noise can be shaped, attenuated, and duty cycled then summed into the audio path either before or after the volume control. in?situ tone and noise generator ? the narrow?band noise and tone stimulus feature can be used for in?situ validation of the hearing aid fitting. the frequency, level and duration of the stimuli are individually adjustable. www. onsemi.com pad connection marking diagram R3710 xxxxxx R3710 = specific device code xxxxxx = work order number vin2 vin1 ms2 dvc out+ out? nc vc ms1 sda clk vb mgnd vreg gnd2 gnd1 1 (bottom view) 2 16 15 14 13 12 11 10 9 3 4 5 6 7 8 see detailed ordering and shipping information on page 15 o f this data sheet. ordering information sip16 case 127dx
rhythm R3710 www. onsemi.com 2 other key features ? R3710 also supports the following features: cross fading between audio paths for click?free program changes, 16?band graphic equalizer, 8 generic biquad filters (configurable as parametric or other filter types), programming speed enhancements, optional peak clipping, flexible compression adjustments, direct interfaces to analog or digital volume control, rocker switch, direct audio input and telecoil. R3710 also encompasses industry?leading security features to avoid cloning and software piracy. features ? advanced research algorithms: ? iscenedetect environmental classification ? 128?band adaptive noise reduction ? adaptive feedback cancellation (afc) ? ilog 6.0 datalogging ? tinnitus masking noise generator ? evoke acoustic indicators ? 1, 2, 4, 6 or 8 channel wdrc ? agc?o with v ariable threshold, time constants, and optional adaptive release ? 16?band graphic equalizer ? narrow?band noise stimulus ? sda or i 2 c programming ? 8 biquadratic filters ? 2 analog inputs ? 16 khz or 8 khz bandwidth ? 4 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 2?t erminal receivers ? internal or external digital volume control with programmable range ? rocker switch support ? support for active hi or active lo switching ? 20?bit audio processing ? thinstax ? packaging ? e1 rohs compliant hybrid ? these devices are pb?free, halogen free/bfr free and are rohs compliant thinstax packaging ? hybrid typical dimensions: 0.180 x 0.123 x 0.060 in. (nominal) (4.57 x 3.12 x 1.52 mm) figure 1. hybrid block diagram noise reduction (128 bands) graphic eq (16 bands) 128 bands wdrc (1,2,4,6 or 8 channels) acoustic indicators and shaper noise generator rhythm R3710 cross fader block diagram peak clipper d/a hbridge feedback canceller post biquad filters 3 & 4 voltage regulator m u x a/d pre bi q ua d filters agco volume control wideband gain control a/d post biquad filters 1 & 2 control (ms/digvc) environmental classification frequency ba n d synthesis data logging eeprom clock generator programming interface frequency ba n d analysis por circuitry 9 5 6 13 4 12 3 7 gnd1 8 gnd2 14 nc out+ out? vc dvc ms1 ms2 vb 16 2 1 15 11 10 vreg vin1 vin2 mgnd sda clk
rhythm R3710 www. onsemi.com 3 specifications table 1. absolute maximum ratings parameter value units operating temperature range 0 to +40 c storage temperature range ?20 to +70 c absolute maximum power dissipation 50 mw maximum operating supply voltage 1.65 vdc absolute maximum supply voltage 1.8 vdc stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device function ality 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 v b = 1.25 v; temperature = 25 c) parameter symbol conditions min typ max units minimum operating supply voltage v boff ramp down, audio path 0.93 0.95 0.97 v ramp down, control logic 0.77 0.80 0.83 supply voltage turn on threshold v bon ramp up, zinc?air 1.06 1.10 1.16 v ramp up, nimh 1.16 1.20 1.24 hybrid current all functions, 32 khz sampling rate ? 665 ? a all functions, 16 khz sampling rate ? 575 ? eeprom burn cycles ? ? 100 k ? ? cycles low frequency system limit ? ? ? 125 ? hz high frequency system limit ? ? ? 16 ? khz total harmonic distortion thd v in = ?40 dbv ? ? 1 % thd at maximum input thd m v in = ?15 dbv, hrx ? on ? ? 3 % clock frequency f clk ? 3.973 4.096 4.218 mhz regulator regulator voltage v reg ? 0.87 0.90 0.93 v system psrr psrr sys 1 khz, input referred, hrx enabled ? 70 ? db input input referred noise irn bandwidth 100 hz ? 8 khz ? ?108 ?106 dbv input impedance z in 1 khz ? 3 ? m anti?aliasing filter rejection ? f = [dc ? 112 khz], v in = ?40 dbv ? 80 ? db crosstalk ? between v in1 and v in2 ? 60 ? db maximum input level ? ? ? ?15 ?13 dbv analogue input voltage range v an_in v in1 , v in2 0 ? 800 mv input dynamic range ? hrx ? on bandwidth 100 hz ? 8 khz ? 95 96 db audio sampling rate ? ? 8 ? 48 khz output d/a dynamic range ? 100 hz ? 8 khz ? 88 ? db output impedance z out ? ? 10 13 control a/d resolution (monotonic) ? ? 7 ? ? bits
rhythm R3710 www. onsemi.com 4 table 2. electrical characteristics (supply voltage v b = 1.25 v; temperature = 25 c) (continued) parameter units max typ min conditions symbol control a/d zero scale level ? ? ? 0 ? v full scale level ? ? ? v reg ? v volume control volume control resistance r vc three?terminal connection 100 ? 360 k volume control range ? ? ? ? 42 db pc_sda input logic 0 voltage ? ? 0 ? 0.3 v logic 1 voltage ? ? 1 ? 1.25 v pc_sda output stand?by pull up current ? creftrim = 6 3 5 6.5 a sync pull up current ? creftrim = 6 748 880 1020 a max sync pull up current ? creftrim = 15 ? 1380 ? a min sync pull up current ? creftrim = 0 ? 550 ? a logic 0 current (pull down) ? creftrim = 6 374 440 506 a logic 1 current (pull up) ? creftrim = 6 374 440 506 a synchronization time (synchronization pulse width) t sync baud = 0 237 250 263 s baud = 1 118 125 132 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.
rhythm R3710 www. onsemi.com 5 table 3. i 2 c timing parameter symbol standard mode fast mode units min max min max clock frequency f pc_clk 0 100 0 400 khz hold time (repeated) start condition. after this period, the first clock pulse is generated. t hd;sta 4.0 ? 0.6 ? sec low period of the pc_clk clock t low 4.7 ? ? ? sec high period of the pc_clk clock t high 4.0 ? ? ? sec set?up time for a repeated start condition t su;sta 4.7 ? ? ? sec data hold time: for cbus compatible masters for i 2 c?bus devices t hd;dat 5.0 0 (note 1) ? 3.45 (note 2) ? 0 (note 1) ? 0.9 (note 2) sec data set?up time t su;dat 250 ? 100 ? nsec rise time of both pc_sda and pc_clk signals t r ? 1000 20 + 0.1 c b (note 4) 300 nsec fall time of both pc_sda and pc_clk signals t f ? 300 20 + 0.1 c b (note 4) 300 nsec set?up time for stop condition t su;sto 4.0 ? 0.6 ? nsec bus free time between a stop and start condition t buf 4.7 ? 1.3 ? sec output fall time from v ihmin to v ilmax with a bus capacitance from 10 pf to 400 pf t of ? 250 20 + 0.1 c b 250 nsec pulse width of spikes which must be suppressed by the input filter t sp n/a n/a 0 50 nsec capacitive load for each bus line c b ? 400 ? 400 pf 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 f alling edge of pc_clk. 2. the maximum t hd;dat has only to be met if the device does not stretch the low period (t low ) of the pc_clk signal. 3. a fast?mode i 2 c?bus device can be used in a standard?mode i 2 c?bus system, but the requirement t su;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 s tretch the low period of the pc_clk signal, it must output the next data bit to the pc_sda line t r max + t su;dat = 1000 + 250 = 1250 ns (according to the standard?mode i 2 c?bus specification) before the pc_clk line is released. 4. c b = total capacitance of one bus line in pf.
rhythm R3710 www. onsemi.com 6 figure 2. i 2 c mode timing
rhythm R3710 www. onsemi.com 7 typical applications 3k75 3k75 lp filter out figure 3. test circuit noise reduction (128 bands) graphic eq (16 bands) 128 bands wdrc (1,2,4,6 or 8 channels) acoustic indicators and shaper noise generator rhythm R3710 cross fader peak clipper d/a hbridge feedback canceller post biquad filters 3 & 4 voltage regulator m u x a/d pre bi q ua d filters agco volume control wideband gain control a/d post biquad filters 1 & 2 control (ms/digvc) environmental classification frequency ba n d synthesis data logging eeprom clock generator programming interface frequency ba n d analysis 200k por circuitry 9 5 6 13 4 12 3 7 8 14 16 2 1 15 11 10 figure 4. typical application circuit noise reduction (128 bands) graphic eq (16 bands) 128 bands wdrc (1,2,4,6 or 8 channels) acoustic indicators and shaper noise generator rhythm R3710 cross fader zero?bias receiver microphone peak clipper d/a hbridge feedback canceller post biquad filters 3 & 4 voltage regulator m u x a/d pre bi q ua d filters agco volume control wideband gain control a/d post biquad filters 1 & 2 control (ms/digvc) environmental classification frequency ba n d synthesis data logging eeprom clock generator programming interface frequency ba n d analysis por circuitry 9 5 6 13 4 12 3 7 8 14 16 2 1 15 11 10
rhythm R3710 www. onsemi.com 8 signal path there are two inputs into the audio signal path. the first input is the front microphone and the second input can be a second microphone or telecoil input as selected by a programmable mux. the front microphone input is intended as the main microphone audio input. 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. the audio input is buffered, sampled and converted into digital form using an a/d converter. the digital output is converted into a selectable 32 khz or 16 khz, 20?bit digital audio signal. further iir filter blocks process the microphone signal. these are followed by four cascaded biquad filters: pre1, pre2, pre3 and pre4. these filters can be used for frequency response shaping before the signal goes through channel and adaptive processing. the channel and adaptive processing consists of the following: ? frequency band analysis ? 1, 2, 4, 6 or 8 channel wdrc ? 16 frequency shaping bands (spaced linearly at 500 hz intervals, except for first and last bands) ? 128 frequency band adaptive noise reduction ? frequency band synthesis after the processing the signal goes through two more biquad filters, post1 and post2, which are followed by the agc?o block. the agc?o block incorporates the wideband gain and the v olume control. there are also two more biquad filters, post3 and post4, and the peak clipper. the last stage in the signal path is the d/a h?bridge. white noise can be shaped, attenuated and then added into the signal path at two possible locations: before the volume control (between the wideband gain and the volume control) or after the v olume control (between post 4 and the peak clipper) as shown in figure 1. functional block description iscenedetect 1.0 environment classification the iscenedetect feature, when enabled, will sense the environment and automatically control the enhancement algorithms without any user involvement. it will detect speech in quiet, speech in noise, music, quiet and noise environments and make the necessary adjustments to the parameters in the audio path, such as anr, wdrc and fbc, in order to optimize the hearing aid settings for the specific environment. iscenedetect will gradually make the adjustments so the change in settings based on the environment is smooth and virtually unnoticeable. this feature will enable the hearing aid wearer to have an instrument which will work in any environment with a single memory. evoke advanced acoustic indicators advanced acoustic indicators provide alerting sounds that are more complex, more pleasing and potentially more meaningful to the end user than the simple tones used on previous products. the feature is capable of providing pulsed, multi?frequency pure tones with smooth on and off transitions and also damped, multi?frequency tones that can simulate musical notes or chords. a unique indicator sound can be assigned to each of the ten system events: memory select (a, b, c, or d), low battery warning, digital vc movement and digital vc minimum/maximum. each sound can consist of a number of either pure tones or damped tones but not both. a pure tone sound can consist of up to four tones, each with a separate frequency, amplitude, duration and start time. each frequency component is smoothly faded in and out with a fade time of 64 ms. the start time indicates the beginning of the fade in. the duration includes the initial fade?in period. by manipulating the frequencies, start times, durations and amplitudes various types of sounds can be obtained (e.g., various signalling tones in the public switched telephone network). a damped tone sound can consist of up to six tones, each with a separate frequency, amplitude, duration, start time and decay time. each frequency component starts with a sudden onset and then decays according to the specified time constant. this gives the audible impression of a chime or ring. by manipulating the frequencies, start times, durations, decays and amplitudes, various musical melodies can be obtained. acoustic indication can be used without the need to completely fade out the audio path. for example, the low?battery indicator can be played out and the user can still hear an attenuated version of the conversation. 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, the afc algorithm 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 5) allows for an increase in the stable gain (see note) of the hearing instrument while minimizing artefacts for music and tonal input signals. as with previous products, the feedback canceller provides completely automatic operation. note: 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.
rhythm R3710 www. onsemi.com 9 figure 5. adaptive feedback canceller (afc) block diagram g h? h + ? feedback path estimated feedback adaptive noise reduction the noise reduction algorithm is built upon a high resolution 128?band filter bank enabling precise removal of noise. the algorithm monitors the signal and noise activities in these bands, and imposes a carefully calculated attenuation gain independently in each of the 128 bands. the noise reduction gain applied to a given band is determined by a combination of three factors: ? signal?to?noise ratio (snr) ? masking threshold ? dynamics of the snr per band the snr in each band determines the maximum amount of attenuation to be applied to the band ? the poorer the snr, the greater the amount of attenuation. simultaneously, in each band, the masking threshold variations resulting from the energy in other adjacent bands is taken into account. finally, the noise reduction gain is also adjusted to take advantage of the natural masking of ?noisy? bands by speech bands over time. based on this approach, only enough attenuation is applied to bring the energy in each ?noisy? band to just below the masking threshold. this prevents excessive amounts of attenuation from being applied and thereby reduces unwanted artifacts and audio distortion. the noise reduction algorithm efficiently removes a wide variety of types of noise, while retaining natural speech quality and level. the level of noise reduction (aggressiveness) is configurable to 3, 6, 9 and 12 db of reduction. in?situ datalogging ? ilog 6.0 R3710 has a datalogging function that records information every 4 seconds to 60 minutes (programmable) about the state of the hearing aid and its environment to non?volatile memory. the function can be enabled with the ark software and information collection will begin the next time the hybrid is powered up. this information is recorded over time and can be downloaded for analysis. the following parameters are sampled: ? battery level ? volume control setting ? program memory selection ? environment ? ambient sound level ? length of time the hearing aid was powered on the information is recorded using two methods in parallel: ? short?term method ? a circular buffer is serially filled with entries that record the state of the first five of the above variables at the configured time interval. ? long?term method ? increments a counter based on the memory state at the same time interval as that of the short?term method. based on the value stored in the counter, the length of time the hearing aid was powered on can be calculated. there are 750 log entries plus 4 memory select counters which are all protected using a checksum verification. a new log entry is made whenever there is a change in memory state, volume control, or battery level state. a new log entry can also be optionally made when the environmental sound level changes more than the programmed threshold, thus it is possible to log only significantly large changes in the environmental level, or not log them at all. the ark software ilog graph displays the ilog data graphically in a way that can be interpreted to counsel the user and fine tune the fitting. this ilog graph can be easily incorporated into other applications or the underlying data can be accessed to be used in a custom display of the information. tinnitus treatment R3710 has an internal white noise generator that can be used for tinnitus t reatment. the noise can be attenuated to a level that will either mask or draw attention away from the user?s tinnitus. the noise can also be shaped using low?pass and/or high?pass filters with adjustable slopes and corner frequencies. the noise can also be duty cycled. the on and off time of the noise stimulus can be adjusted so that the on time is from 1 ? 30s as well as the off time. an off time set to 0s turns off the duty cycling. as shown in figure 1, the t innitus treatment noise can be injected into the signal path either before or after the volume control (vc) or it can be disabled. 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 then it is not affected by vc changes. the tinnitus treatment noise can be used on its own without the main audio path in a very low power mode by selecting the tinnitus treatment noise only. this is beneficial either when amplification is not needed at all by a user or if the user would benefit from having the noise supplied to them during times when they do not need acoustic cues but their sub?conscious is still active, such as when they are asleep. the ark software has a tinnitus treatment tool that can be used to explore the noise shaping options of this feature.
rhythm R3710 www. onsemi.com 10 this tool can also be easily incorporated into another software application. if the noise is injected before the vc and the audio path is also enabled, the device can be set up to either have both the audio path and noise adjust via the vc or to have the noise only adjust via the vc. if the noise in injected after the vc, it is not affected by vc changes (see table 4). table 4. noise injection effect on vc noise insertion modes vc controls noise injected audio enabled off audio off yes pre vc audio + noise pre vc yes post vc audio post vc yes noise only pre vc noise pre vc no noise only post vc ? post vc no pre vc with noise noise pre vc yes narrow?band tone and noise stimulus R3710 is capable of producing narrow?band noise and tone stimuli that can be used for in situ audiometry. each narrow?band noise is centred on an audiometric frequency. the duration of the stimuli is adjustable and the level of the stimuli are individually adjustable. a/d and d/a converters the system?s a/d converter is a second order sigma?delta modulator operating at a 2.048 mhz sample rate. the system?s audio input is pre?conditioned with antialias filtering and a programmable gain pre?amplifier. this analog output is over?sampled 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 sampling rate of 32 khz. the d/a is comprised of a digital, third 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 or 128?times over?sampled, 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. hrx head room expander R3710 has an enhanced head room extension (hrx) circuit that increases the input dynamic range of R3710 without any audible artifacts. this is accomplished by dynamically adjusting the pre?amplifier?s gain and the post?a/d attenuation depending on the input level. channel processing figure 6 represents the i/o characteristic of independent agc channel processing. the i/o curve can be divided into the following main regions: ? low input level expansion (squelch) region ? low input level linear region ? compression region ? high input level linear region (return to linear) figure 6. independent channel i/o curve flexibility ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 output level (dbv) input level (dbv) low level gain compression ratio high level gain squelch threshold lower threshold upper threshold the i/o characteristic of the channel processing can be adjusted in the following ways: ? squelch threshold (squelchth) ? low level gain (llgain) ? lower threshold (lth) ? high level gain (hlgain) ? upper threshold (uth) ? compression ratio (cr) to ensure that the i/o characteristics are continuous, it is necessary to limit adjustment to a maximum of four of the last five parameters. during parameter map creation, it is necessary to select four parameters as user adjustable, or fixed, and to allow one parameter to be calculated. the squelch region within each channel implements a low level noise reduction scheme (1:2 or 1:3 expansion ratio) for listener comfort. this scheme operates in quiet listening environments (programmable threshold) to reduce the gain at very low levels. when the squelch and afc are both enabled it is highly recommended that the squelch be turned on in all channels and that the squelch thresholds be set above the microphone noise floor (see adaptive feedback canceller). the number of compression channels is programmable in arkonline ? and can be 1, 2, 4, 6 or 8. graphic equalizer R3710 has a 16?band graphic equalizer. the bands are spaced linearly at 500 hz intervals, except for the first and
rhythm R3710 www. onsemi.com 11 the last band, and each one provides up to 24 db of gain adjustment in 1 db increments. biquad 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 z ?1 b2 z ?2 1 a1 z ?1 a2 z ?2 note that the a0 coefficient is hard?wired to always be ?1?. the coefficients are each 16 bits in length and include one sign bit, one bit to the left of the decimal point, and 14 bits to the right of the decimal point. thus, before quantization, the floating?point coefficients must be in the range ?2.0 x < 2.0 and quantized with the function: round x 2 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 display 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. volume control and switches external volume control the volume of the device can either be set statically via software or controlled externally via a physical interface. R3710 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. analog volume control the external volume control works with a three?terminal 100 k ? 360 k 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 m of resistance, but this could result in a slight decrease in the resolution of the taper. 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 R3710. the digital volume control can be setup to adjust both volume levels and memory co nfigurations depending on the length of time the momentary switch is depressed. it is also possible to read and write the digital volume control with the ark software. using these software functions will lock out the digital volume control until the next time the hybrid is powered on. figure 7. wiring for digital volume control d_vc vc gnd memory select switches one or two, two?pole memory select (ms) switches can be used with R3710. this enables user?s tremendous flexibility in switching between configurations. up to four memories can be configured and selected by the ms switches on R3710. 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.
rhythm R3710 www. onsemi.com 12 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 . there are four basic ms switch modes of operation as shown in table 5 below. table 5. 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 6 below. table 6. 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 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 this mode uses a single momentary switch on ms1 (pin 10) 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. this mode is set by programming the ?mssmode? parameter to ?momentary? and ?donly? to ?disabled?. example: if 4 valid memories: abcdabcda if 3 valid memories: abcabca if 2 valid memories: ababa if 1 valid memory: aaa mode 2: momentary switch on ms1, static switch on ms2 (jump to last memory) this mode uses a static switch on ms2 (pin 9) and a momentary switch on ms1 (pin 10) to change memories. if the static switch is open, the part starts in memory a and the momentary switch is enabled, with the exception that memory d is not used. startup or during normal operation. if the static switch on ms2 is closed, the part automatically jumps to memory d (occurs on startup or during normal operation). in the above setup when the static switch is closed, the momentary switch is disabled, preventing memory select beeps from occurring. when ms2 is set to open, the part returns to the last select memory. this mode is set by programming the ?mssmode? parameter to ?momentary? and ?donly? to ?enabled?. example: when ms2 = open, then ms1 can cycle through up to 3 valid memories: abcabca ? if ms2 = closed: d, then memory d is enabled table 7. dynamic example with four valid memories and ms2 pull?up/pull?down = pull?down (t = momentary switch is toggled; 0 = open; 1 = high) ms2 0 0 0 1 1 1 0 0 0 1 0 0 0 0 0 0 ms1 0 t t 0 t t 0 t t 0 0 t t t t t memory a b c d d d c a b d b c a b c a
rhythm R3710 www. onsemi.com 13 mode 3: static switch on ms1 and ms2 this mode uses two static switches to change memories. table 8 describes which memory is selected depending on the state of the switches. in this mode, it is possible to jump from any memory to any other memory simply by changing the state of both switches. if both switches are changed simultaneously, then the transition is smooth. otherwise, if one switch is changed and then 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. this mode is set by programming the ?mssmode? parameter to ?static? and ?donly? to ?disabled?. table 8. memory selected by static switch on ms1 and ms2 mode; (example with four valid memories) ms1 ms2 memory open open a closed open b (if valid, otherwise a) open closed c (if valid, otherwise a) closed closed d (if valid, otherwise a) mode 4: static switch on ms1, static switch on ms2 (jump to last memory) this mode uses two static switches to change memories. unlike in the previous example, this mode will switch to the last valid memory when the static switch on ms2 is closed. this means that this mode will only use a maximum of three memories (even if four valid memories are programmed). table 9 describes which memory is selected depending on the state of the switches. this mode is set by programming the ?mssmode? parameter to ?static? and ?donly? to ?enabled?. table 9. memory selected by static switch on ms1, static switch on ms2 (jump to last memory) mode ms1 ms2 memory open open a closed open b (if valid, otherwise a) open closed d closed closed d in this mode, it is possible to jump from any memory to any other memory simply by changing the state of both switches. if both switches are changed simultaneously, then the transition is smooth. otherwise, if one switch is changed and then the other, the part transitions to an intermediate memory before reaching the final memory. when ms2 is closed, the state of the switch on ms1 is ignored. this prevents memory select beeps from occurring if switching ms1 when ms2 is closed. the part starts in whatever memory the switches are selecting. if a memory is invalid, the part defaults to memory a. the part starts in whatever memory the switches are selecting. if a memory is invalid, the part defaults to memory a. agc?o and peak clipper the output compression?limiting block (agc?o) is an output limiting circuit whose compression ratio is fixed at : 1. the threshold level is programmable. the agc?o module has programmable attack and release time constants. the agc?o on R3710 has optional adaptive release functionality. when this function is enabled, the release time varies depending on the environment. in general terms, the release time becomes faster in environments where the average level is well below the threshold and only brief intermittent transients exceed the threshold. conversely, in environments where the average level is close to the agc?o threshold, the release time applied to portions of the signal exceeding the threshold is longer. the result is an ef fective low distortion output limiter that clamps down very quickly on momentary transients but reacts more smoothly in loud environments to minimize compression pumping artifacts. the programmed release time is the longest release time applied, while the fastest release time is 16 times faster. for example, if a release time of 128 ms is selected, the fastest release time applied by the agc?o block is 8 ms. R3710 also includes the peak clipper block for added flexibility. memory switch fader to minimize potential loud transients when switching between memories, R3710 uses a memory switch fader block. when the memory is changed, the audio signal is faded out, followed by the memory select acoustic indicators (if enabled), and after switching to the next memory, the audio signal is faded back in. the memory switch fader is also used when turning the tone generator on or off, and during sda programming. power management R3710 has three user?selectable power management schemes to ensure the hearing aid turns off 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
rhythm R3710 www. onsemi.com 14 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. note: the values set in ids are relative values from 0 to 11 seconds; not absolute. the por delay is relative to the configuration loaded on the wolverine platform. 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 R3710 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 f luctuations 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 a bove 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, 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. software and security R3710 incorporates the following security features to protect the device from cloning and against software piracy: ? dll protection by password ? prevents a third party from using ids to reconfigure parts. ? hybrid authentication by 128?bit fingerprint to identify parts in application software ? prevents a third party
rhythm R3710 www. onsemi.com 15 from cloning a device?s eeprom because the fingerprint cannot be overwritten. special functions can be used in fitting software to reject parts that do not match the expected fingerprint. this would prevent the piracy of fitting software. ? dll to hybrid pairing by using a software key in ark to match product libraries with client software ? a part can be ?locked? at manufacturing time so that it only communicates with the library it was programmed with. this prevents a third party from potentially upgrading a device with a different library in ids or other application software. full software support is provided for every stage of development from design to manufacturing to fitting. for details, refer to the getting started with the ark software information note. sda and i 2 c communication R3710 can be programmed using the sda or i 2 c 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. 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 for R3710 resulting in increased communication speed. certain parameters in arkonline can be selected to reduce the number of pages that need to be read out. in sda mode, R3710 is programmed via the sda pin using industry standard programming boxes. i 2 c mode is a two wire interface which uses the sda pin for bidirectional data and clk as the interface clock input. i 2 c programming support is available on the hipro (serial or usb versions) and on semiconductor?s dsp programmer 3.0. power supply considerations R3710 was designed to accommodate high power applications. ac ripple on the supply can cause instantaneous reduction of the battery?s voltage, potentially disrupting the circuit?s function. R3710 hybrids have a separate power supply and ground connections for the output stage. this enables hearing instrument designers to accommodate external rc filters to minimize any ac ripple from the supply line. reducing this ac ripple greatly improves the stability of the circuit and prevents unwanted reset of the circuit caused by spikes on the supply line. for more information on properly designing a filter to reduce supply ripple, refer to the using dsp hybrids in high power applications initial design tips information note. 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. ordering information device package shipping ? R3710?ceaa?e1t sip16 (pb?free) 250 units / tape & reel R3710?ceaa?e1 sip16 (pb?free) 25 units / bubble pack ?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 R3710 contact your sales account manager or fae and use part number R3710gevb.
rhythm R3710 www. onsemi.com 16 table 10. pad position and dimensions (mil) pad no. pad name pad position pad dimensions x y xdim ydim 1 vin2 ?71 44 23 23 2 vin1 ?42 44 21 23 3 ms2 ?14 44 21 23 4 dvc 14 44 21 23 5 out+ 42 44 21 23 6 out? 71 44 23 23 7 gnd1 71 14.5 23 21 8 gnd2 71 ?14.5 23 21 9 vb 71 ?44 23 23 10 clk 42 ?44 21 23 11 sda 14 ?44 21 23 12 ms1 ?14 ?44 21 23 13 vc ?42 ?44 21 23 14 nc ?71 ?44 23 23 15 mgnd ?71 ?14.5 23 21 16 vreg ?71 14.5 23 21 5. pin location is referenced to the center of the hybrid device. 6. pad position is relative to the center of the hybrid pad.
rhythm R3710 www. onsemi.com 17 table 11. pad position and dimensions (mm) pad no. pad name pad position pad dimensions x y xdim ydim 1 vin2 ?1.8034 1.1176 0.5842 0.5842 2 vin1 ?1.0668 1.1176 0.5334 0.5842 3 ms2 ?0.3556 1.1176 0.5334 0.5842 4 dvc 0.3556 1.1176 0.5334 0.5842 5 out+ 1.0668 1.1176 0.5334 0.5842 6 out? 1.8034 1.1176 0.5842 0.5842 7 gnd1 1.8034 0.3683 0.5842 0.5334 8 gnd2 1.8034 ?0.3683 0.5842 0.5334 9 vb 1.8034 ?1.1176 0.5842 0.5842 10 clk 1.0668 ?1.1176 0.5334 0.5842 11 sda 0.3556 ?1.1176 0.5334 0.5842 12 ms1 ?0.3556 ?1.1176 0.5334 0.5842 13 vc ?1.0668 ?1.1176 0.5334 0.5842 14 nc ?1.8034 ?1.1176 0.5842 0.5842 15 mgnd ?1.8034 ?0.3683 0.5842 0.5334 16 vreg ?1.8034 0.3683 0.5842 0.5334 7. pin location is referenced to the center of the hybrid device. 8. pad position is relative to the center of the hybrid pad.
rhythm R3710 www. onsemi.com 18 package dimensions sip16 4.57x3.12 case 127dx issue o seating plane notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters. 3. coplanarity applies to spherical crowns of solder bumps. 4. dimension b is measured at the maxi- mum bump dimension parallel to da- tum c. dim a min max ??? millimeters a1 b e e1 0.699 bsc 1.524 a b pin 1 indicator e a 0.05 b c 0.03 c 0.05 c 16x b 0.13 c a1 c 0.052 0.152 0.711 bsc *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* top view side view bottom view note 3 recommended 14 1 a 6 e1 a2 9 note 4 d 3.124 bsc d2 a2 0.343 bsc ??? 1.372 0.503 0.536 l 0.503 0.536 e e2 0.356 bsc 4.572 bsc 0.13 c 0.13 c d e e2 d2 a 0.05 b c 0.03 c 16x l note 4 0.550 16x dimensions: millimeters 0.711 0.699 package outline pitch pitch 1 0.550 16x 0.712 0.686 p ublication ordering information n. american technical support : 800?282?9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81?3?5817?1050 R3710/d iscenedetect, ilog, hrx, rhythm, wolverine, thinstax and evoke are trademarks of semiconductor components industries, llc. frontwave, paragon and arkonline are registered trademarks of semiconductor components industries, llc. literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loc al sales representative on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent?marking.pdf . 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 o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner.

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