HPM10 - Power Management IC for Hearing Aids
Contents
1. __ w gt Charge curentpreciion vEMeasvem sm gt CHARGER COMMUNICATION INTERFACE Lemaire Trew wor sv zs as Transmit data rate data rate TXDR DR VDDP VDDP 5V sd V ELI current modulation LM Imod s Rdown and switch Receive LLL MM level for EM Vih VDDP VDDP VDDP input high 0 15 0 2 0 25 Receive voltage level for RX Vil VDDP VDDP VDDP input low 0 05 0 05 Allowable Rise Fall Time Voltage modulation 200 mV 100 for VDDP Supply STEP DOWN CHARGE PUMP aid Bu um Relative to VBAT lload 1 mA VBAT RE Switching frequency using Freq 125 EXT CLK or a division of EXT CLK LEN REI Ripple lload tmA 1 Load current LH functional operation VBAT 3 6 V 3 During OTP programming the maximum VDDP value is 5 7 V This allows VDDP to be tied to VDD_OTP 4 HPM10 is functional in this range but is not supposed to meet specification in terms of voltages currents thresholds and precision www onsemi com 3 HPM10 Table 3 ELECTRICAL SPECIFICATIONS Description Symbol Conditions mm Typ Unite Screened HEARING AID MODE OSCILLATOR PAFK S we Clock frequency T 0 C to 50 C 10 1 10 fclk temperature deviation Clock frequency supply Vbat 1 V to 4 3 V 10 0 2 10 9 ofclk deviation CRADLE MODE2. A RECOMMENDED O 0 08 C A1 Pa SOLDERING FOOTPRINT SEATING NOTE 3 SIDE VIEW PLANE PIN A1 REFERENCE 2 2X 0 10 C 0 40 lt 0 30 PITCH PITCH A1 elm e e 9 0 30 PITCH Joe e pu 0 12 BM DIMENSIONS MILLIMETERS For additional information on our Pb Free strategy and soldering C details please download the ON Semiconductor Soldering and BOTTOM VIEW Mounting Techniques Reference Manual SOLDERRM D Y oc oro e 9 O O OJO Table 7 HPM10 Pin Arrangement RESERVED VDDIO CCIF VDDP RESERVED DS_EN VSS DVREG e T Soa Co son cr e 9s _ www onsemi com 16 HPM10 Table 8 MISC DIE SPECIFICATION Bump metallization Lead Free Sn Ag Cu Backside coating specification Adwill LC2850 Backside coating thickness 40 um 3 um LOFP 32 Pin List The HPM10 version used on development boards is packaged in a LQFP package of 32 pins The following table shows the allocation of the IOs Table 9 LQFP PIN LIST y o CP1B CP1A SCL y o 17
3. o Supply for digital I O Should most commonly be connected to DVREG 2 serial clock pad 2 serial data line Do not connect Do not connect Digital CCIF signal or tri state Charge status OTP Burn Connect to VDDIO during OTP burning Leave floating or grounded for nor mal operation Deep sleep enable input Enable use of regulator when VBAT gt 1 5 V S A o lt I gt c z g g 1 1 1 EXT CLK External clock input Also used to output oscillator clock to the sys tem for test SWOUT Level shifted version of SWIN input S Ground for digital circuits WARN Shutdown warning VDDP primary charger input Linear regulator for digital core Do not connect Ground for charge pump Charge pump cap 2 terminal B Charge pump cap 2 terminal A Charge pump cap 1 terminal B Charge pump cap 1 terminal A Hearing aid DSP voltage connection Connection to battery Input for external button VDD OTP HV pad normally connected to VDDP used for OTP programming supply VSSA Ground for analog circuitry and OTP Legend Type A analog D digital I input output P 2 power Dw Internal Weak 1 MQ pull down Uw Internal Weak 1 MQ pull up Dw2 Internal Weak 2 pull down Ds Internal 100 pull down U Internal 20 KQ pull up I C lines can have external pull up for extra drive value defined by IC Standard but not to be less than 1 KQ I gt B B C B D D D B B D
4. F E F E F F F E 3 2 2 4 4 3 5 2 4 5 5 5 4 2 3 3 5 5 1 4 4 2 lt lt I www onsemi com 7 HPM10 HPM10 Usage in a Hearing Aid HPM10 has the built in flexibility to allow integration within various sorts of hearing instruments The battery door can be sealed or unsealed The hearing aid may have a pushbutton or may not HPM10 can be integrated with the hearing aid DSP though dedicated communication lines or it can work independently from the hearing aid DSP The following list gives a few possible scenarios of integration Hearing Aid with a Push Button and Sealed Battery Door Cradle Charging When the hearing aid is inserted to the cradle it will charge While charging the hearing aid will turn off When the hearing aid is taken out from the cradle it will go into Deep Sleep Mode HPM10 in Deep Sleep Mode Power On Off To turn on the hearing aid use the pushbutton Logic high at SWIN signal is detected and turns on HPM10 HPM10 supplies the main DSP with VHA To turn off the hearing aid use the pushbutton Logic high at SWOUT sent to main DSP Main DSP to send DS EN to HPM10 to turn off Store Shelf Mode To put the hearing aid in Store Shelf Mode the same operation as turning the hearing aid off applies Battery When battery goes EOL the hearing aid will automatically turn off HPM10 in Deep Sleep Mode through two possible mechanisms
5. protect the battery from over discharge DSP detects low battery voltage and puts HPM10 in Deep Sleep Mode through the 05 EN pin In all modes when the device is removed from the cradle it will either immediately turn on or wait until the pushbutton is pushed This means that for the first and second use cases Hearing Aid with a Pushbutton and Sealed Battery Door Cswin 100nF 1uF p and Hearing Aid with a Pushbutton and Unsealed Battery Door the hearing aid manufacturer will be able to configure HPM10 to directly switch on or wait for the pushbutton In case the hearing aid doesn t have a pushbutton once the battery is fully charged and the hearing aid remains on the cradle HPMIO includes a system that compensates the current drawn by its components detecting the cradle mode exit In this case the hearing aid can be left on the charger for an extended amount of time without any drain or extra charge on the battery Wakeup on SWIN Pushbutton In a hearing aid that contains pushbuttons HPM10 will wake up the entire system VHA active from Deep Sleep Mode when SWIN is closed to VBAT for 20 ms minimum Wakeup also requires a battery voltage appropriate for a healthy battery For ZnAir or AgZn VBAT gt 1 1 V and VBAT 2 2 V For Li Ion VBAT gt 3 0 V Wakeup on Battery Insertion Waking up HPM10 on battery insertion requires an external capacitor from VBAT to SWIN The SWIN pull down is a large 2 MQ res
6. voltage is above 1 5 V first discharge plateau This regulator will be used in case the hearing aid DSP input voltage range is limited to 1 5 V Disabling this regulator is done tying the AGZN REG EN pin to ground Note that if Zinc Air or AgZn battery are used and VBAT 1 5 V the AgZn regulator will not be used and the VBAT will be shorted to the VHA If VBAT gt 1 45 V the AgZn regulator is enabled Hysteresis has been added to all these thresholds If Li Ion battery is installed the AgZn Regulator is disabled and the DIV3 is enabled Slave I2C In Cradle Mode or during debug HPM10 has a slave I2C port to allow an external host device to access all the HPM10 internal registers when in Cradle Mode It is also used for OTP burning standalone test and debug When in Hearing Aid Mode the is off Charger Communication Interface CCIF This is a bi directional interface that will communicate the status of the charging process in Cradle Mode to the hearing aid charger and allow user interaction with HPM10 Normally once the hearing aid is assembled and the battery attached this interface is the only means to monitor the battery health The CCIF will communicate with the hearing aid charger using a superset of the Qi inductive power standard based communications protocol using an UART type encoding This protocol has been developed for wireless charging systems Although this version of HPM10 is only supporting
7. 18 19 20 21 22 23 24 25 26 27 28 29 30 81 2 3 ON Semiconductor and the W are registered trademarks of Semiconductor Components Industries LLC SCILLC or its subsidiaries in the United States and or other countries SCILLC owns the rights to a number of patents trademarks copyrights trade secrets and other intellectual property A listing of SCILLC s product patent coverage may be accessed at www onsemi com site pdf Patent Marking pdf SCILLC reserves the right to make changes without further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC 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 Typical parameters which may be provided in SCILLC data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for
8. Controller y q cen lt VSSA gt 501 gt _ V To Programmer 12C Interface SDA Voltage switch controller AGZN ADC T 1 V Regulator Te t CHA emperature Step Down E Charge Pump I Bp E DVREG Volt d DIS oltage an CREG H 2 L CP1 Figure 1 HPM10 Architecture 9955 9199 www onsemi com 5 HPM10 External Components HPM10 requires six external components listed in Table 4 Depending which type of rechargeable battery is used some of the decoupling caps are not needed Table 4 EXTERNAL COMPONENTS LL NR Capacitor 1 for charge pump 2 2 2096 Required for Lithium lon For other batteries CP1A and CP1B pins can be floating Capacitor 2 for charge pump 2096 Required for Lithium lon For other batteries CP2A and CP2B can be floating VHA decoupling capacitor 20 Cvbat Battery decoupling cap EN should always be 5 Cha to ensure reliable startup Creg Voltage and current ref decoupling cap 2096 Button to interact with the system ERN RE RR Intermittent www onsemi com 6 HPM10 Chip Interface Specifications HPM10 has a total of 29 pads Descriptions of these pads are given in Table 5 Table 5 PAD DESCRIPTIONS E2 CLKDIV O EXT CLK divider ratio CLKDIV 1 EXT CLK divider ratio CLKDIV 2 EXT CLK divider ratio S Power Domain lt I gt lt I gt lt I I gt
9. EG EN WARN Max VDDP Source Current 5 5 2 5 VDDIO 0 3 VBAT 0 3 2 0 Note 1 3 7 5 0 5 20 30 5 o O 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 1 Max value should not exceed VBAT 0 3 V Table 2 ELECTRICAL OVERSTRESS IMMUNITY ELECTROSTATIC DISCHARGE ON COMPONENT LEVEL ESD HBM ESD MM ESD CDM ESD STM 5 3 1 1999 Latch up 2 All pins at room temperature JESD22 A114 2 kV Note 2 JESD22 A115 200V 500 V all pins JESD78 100 mA 25 C www onsemi com HPM10 Electrical Performance Specifications Table 3 ELECTRICAL SPECIFICATIONS Description Symbol Conditions mm J Unts Screened OVERALL OPERATING CONDITIONS Analog DC supply VDDP DC Supply from charger 5 2 Note 3 Fes woe Y erase ong e oF meme 5 P rome ee fv 7 _ 39 es ve Used EE Ll mace mam 0 pw p p x pe Operating temperature Extended Operating m ext 20 70 C temperature Note 4 CHARGE VOLTAGE AND CURRENT SOURCE Gwmwomemwe we ohare curensraniary weis dT Td Wenme
10. HA ZnAir AgZn regulator disabled regulator enabled e e e 7 t 1 43V 1 05V 3 0 40 VBAT Li lon ONLY LI 0 4 3V 6 9 9 F P EZ E t 9 10 9 H Y 1 0 2 0 1 1V ZnAir 1 65V 4 5 1 2V AgZzn 2 0 2 2V 1 0V 3 0V ChargePump 4 3V Li lon ONLY LI 21 4 3V ail M M Bre Figure 4 Hearing Aid Mode Voltage Monitoring www onsemi com 11 HPM10 Interfaces to Host DSP In Hearing Aid Mode the SWOUT pin provides a level shifted version of the SWIN pin The SWOUT pin would typically be connected to the host DSP s GPIO pin so that the button on the hearing aid connected to SWIN can also be used for other functions such as memory select or volume control The DS EN input pin is provided for the DSP to trigger Deep Sleep Mode tis active in Hearing Aid Mode only it is ignored in Cradle Mode t is protected from glitches with a 100 usec de glitch circuit The host DSP will need to hold the pin high for greater than 100 usec to put HPM10 into Deep Sleep Mode thas a 100 kOhm pull down During power up it will be held low as it will be connected to the host DSP s GPIO pin with the following assumptions The is by default in input mode during power up The resistance used for pull up is greater than 250 KOhm After boot up the host DSP configures the GPIO pin as an output in a low state If the GPIO
11. HPM10 Power Management IC for Hearing Aids Introduction HPM10 is a Power Management IC PMIC that provides high performance solution for rechargeable batteries in hearing aids and hearing implant devices Responsible for generating the voltage needed by the hearing aid it manages the charging algorithms such that the battery autonomy and the number of charging cycles are optimized The rechargeable chemistries supported include silver zinc AgZn and lithium ion Li Ion HPM10 also detects zinc air Zn Air and nickel metal hydride Ni MH batteries but doesn t charge them HPM10 includes a Charger Communication Interface CCIF to inform the hearing aid charger about the charging progress Other battery information such as voltage levels current levels temperature and different types of battery failures can also be communicated HPM10 has the flexibility that allows easy integration into various types of hearing aids It can be used without any connection to the main hearing aid digital signal processing DSP and manage the switch on and off operation as well as the battery EOL control by itself Closer integration and communication with the main hearing aid DSP can also be obtained This document contains information on a product under development ON Semiconductor reserves the right to change or discontinue this product without notice This document and the information contained herein is CONFIDENTIAL AND PROPRIETAR
12. HPM10 goes into Deep Sleep Mode to protect the battery from over discharge DSP detects low battery voltage and puts HPM10 into Deep Sleep Mode through the DS EN Hearing Aid with a Push Button and Unsealed Battery Door Cradle Charging When the hearing aid is inserted to the cradle it will charge While charging the hearing aid will turn off When the hearing aid is taken out from the cradle it will go into Deep Sleep Mode HPM10 in Deep Sleep Mode Power On Off When the battery is removed the hearing aid will shut down When the battery is inserted the hearing aid will go into Deep Sleep Mode HPM10 in Deep Sleep Mode To turn on the hearing aid use the pushbutton Logic high at SWIN signal is detected and turns on HPM10 HPM10 supplies the main DSP with VHA To turn off the hearing aid use the pushbutton Logic high at SWOUT sent to main DSP Main DSP to send DS EN to HPM10 to turn VHA off Battery When battery goes EOL the hearing aid will automatically turn off HPM10 in Deep Sleep Mode through two possible mechanisms HPM10 goes into Deep Sleep Mode to protect the battery from over discharge DSP detects low battery voltage and puts HPM10 in Deep Sleep Mode through the DS EN pin Hearing Aid without Push Button and Sealed Battery Door In this mode it is possible that there won t be any communication lines between the DSP and HPM10 Cradle Charging and Power On Off
13. OSCILLATOR Clock frequency Clock frequency T 25C 250 88 88 26132 12 Clock frequency uU to 50 EM temperature deviation Clock frequency supply VDDP 5 0 to 5 2 V 9 ofclk deviation BATTERY DETECTION Hearing Aid Mode Turn On threshold AgZn and ZnAir 1 045 1 155 Startup Delay VBAT 3 V from SWIN step 20 ms input to VHA turn on AgZn battery detection AgZn 2 09 2 2 2 31 V al upper threshold Li lon battery detection Lithium lon 2 85 3 3 15 V al turn on threshold __ tarumton 1 5 3 VOLTAGE SWITCH CONTROLLER amp w Sd L9 Sweater w rcc 5 AgZn REGULATOR eee ee NUM AgZn regulator Vagzn Limiting regulator for 1 4 1 58 AgZn 1 5 V Max load current Imax For functional operation VBAT 1 15 V ANALOG TO DIGITAL CONVERTER ADC Sampling frequency per fs CH 4 MUX inputs input channel Input range range Referred to bandgap VREF EE TEMPERATURE SENSOR Temperature Measurement Trange 50 Range Temperature Pression 5 s DIGITAL INPUT THRESHOLDS uomemDssrewm a DS EN CLKDIV 2 0 agzn en th Hearing AidMode VBAT 3 8 V AGZN REG EN 3 During OTP programming the maximum VDDP value is 5 7 V This allows VDDP to be tied to VDD OTP 4 HPM10 is functional in this range bu
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15. When the hearing aid is inserted into the cradle it will charge While charging hearing aid will turn off When the hearing aid is taken out from the cradle it will turn on Store Shelf Mode To put the hearing aid in Store Shelf Mode Trigger DS EN on HPM10 interface either over DSP or by bringing out the 05 EN pin in PCB This would put HPM10 into deep sleep mode resulting in extended battery shelf life for the hearing aid Battery When battery goes EOL the hearing aid will automatically turn off HPM10 in Deep Sleep Mode through two possible mechanisms HPM10 goes into Deep Sleep Mode to protect the battery from over discharge DSP detects low battery voltage and puts HPM10 in Deep Sleep Mode through the DS EN pin Hearing Aid without a Push button and an Unsealed Battery In this mode it is possible that there won t be any communication lines between the DSP and HPM10 www onsemi com HPM10 Cradle Charging When the hearing aid is inserted to the cradle it will charge While charging the hearing aid will turn off When the hearing aid is taken out from the cradle it will turn on Power On Off When the battery is removed the hearing aid will shut down When the battery is inserted the hearing aid will turn on Battery When the battery goes EOL the hearing aid will automatically turn off HPM10 in Deep Sleep Mode through two possible mechanisms HPM10 goes into Deep Sleep Mode to
16. Y and the property of Semiconductor Components Industries LLC dba ON Semiconductor It shall not be used published disclosed or disseminated outside of the Company in whole or in part without the written permission of ON Semiconductor Reverse engineering of any or all of the information contained herein is strictly prohibited 2015 SCILLC All Rights Reserved Semiconductor Components Industries LLC 2015 1 October 2015 Rev 0 ON Semiconductor www onsemi com WLCSP29 BARE DIE CASE 567MK MARKING DIAGRAM AWLYYWW A Assembly Location WL Wafer Lot YY Year WW Work Week ORDERING INFORMATION HPM10W29A100G Bare Die 5 000 Tape Pb Free amp Reel TFor information on tape and reel specifications including part orientation and tape sizes please refer to our Tape and Reel Packaging Specification Brochure BRD8011 D Publication Order Number HPM10 D HPM10 Key Features Supports Multiple Battery Types Can charge and manage the power of multiple battery chemistries including rechargeable Li ion and AgZn batteries Ni MH batteries and disposable Zn Air batteries can be detected as well An automatic chemistry detection system recognizes the battery type Flexibility to Support Multiple Battery Sizes The charging parameters should be updated depending on the battery size Parameters corresponding to one battery size can be stored in an One Time Programmable OTP me
17. and technology TotalPhase Inc or the Communication Accelerator Adaptor assessment through to prototyping and product launch CAA from ON Semiconductor On the PC the An Evaluation Board and a Charger Board are available communication box will use a USB interface On HPM10 for customers to demonstrate evaluate and develop the interface of HPM10 will be used products based on HPM10 10 Programming Interface This application is Company or Product Inquiries primarily used on the production line It allows a technician For more information about ON Semiconductor products to program HPM10 s OTP predetermined register values A or services visit our Web site at http onsemi com user s manual will describe the product application features www onsemi com 15 HPM10 PACKAGE DIMENSIONS WLCSP29 2 05x1 74 CASE 567MK ISSUE O E Al IB NOTES 1 DIMENSIONING AND TOLERANCING PER ASME Y14 5M 1994 A CONTROLLING DIMENSION MILLIMETERS COPLANARITY APPLIES TO SPHERICAL CROWNS OF SOLDER BALLS 4 DATUM C THE SEATING PLANE IS DEFINED BY THE SPHERICAL CROWNS OF SOLDER BALLS 5 DIMENSION b IS MEASURED AT THE MAXIMUM SOLDER BALL DIAMETER PARALLEL TO DATUM C MILLIMETERS DIE COAT DIM MIN MAX A 0 46 Ai 009 0 15 A2 0 29 REF 0100 Y b 022 0 32 D 2 05 BSC D2 0 185 BSC TOP VIEW E 1 74 BSC E2 0 27 BSC A2 DETAIL A e 0 30 BSC A DETAIL A 1 0 40 BSC Z o10 c
18. any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and distributors 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 SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT American Technical Support 800 282 9855 Toll Free Semiconductor Website www onsemi com Literature Distribution Center for ON Semiconductor USA Canada 19521 E 32nd Pkwy Aurora Colorado 80011 USA Europe Middle East and Africa Technical Support Order Literature http www onsemi com orderlit Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Phone 421 33 790 2910 TS Fax 303 675 2176 or 800 344 3867 Toll Free USA Canada Japan Customer Focus Center For additional information please contact your local Email orderlit onsemi com Phone 81 3 5817 1050 Sales Representative H
19. ard This clock is used only in Hearing Aid Mode and in OTP burn mode ATST ENZVDDIO There is no clock active during the Deep Sleep Mode Supply Management There are several forms of supply management on HPM 10 Battery Charge Control This block provides either a constant current or constant voltage to the attached battery Both the current and voltage levels are programmable when in their respective phases www onsemi com 14 HPM10 Step Down Charge Pump A high efficiency charge to generate the high precision voltage references pump generating a voltage equal to 1 3 of the battery needed for charging It also generates other references voltage is used for Li Ion batteries It supplies directly for the ADC OSC and current reference A 1 V low to the hearing aid chip as the main power supply The resolution bandgap is used in Hearing Aid Mode for output impedance of the charge pump is low less than wakeup and Veol comparators 10 ohms General Purpose Analog to Digital Converter ADC The general purpose ADC with input mux will allow the state machine to properly manage the charging algorithm based on analog measurements Digital Voltage Regulator This block provides the supply voltage to the digital logic low voltage band gaps oscillator I V sense and ADC when in Charge Mode The signals being monitored include Hearing Aid Mode Voltage Regulator This block e Battery voltage VBAT provides the supply
20. em using HPM10 Time Deep Sleep Mode Figure 5 Battery Monitoring for Battery End of Life EOL The hearing aid DSP will have to determine its Veol threshold and detect when the VBAT reaches this level From this point the hearing aid DSP will have to manage its battery EOL procedure playing a beep users hear managing datalogging etc before its toggles the 05 EN pin If the DS EN pin hasn t been toggled by the hearing aid DSP and if the hearing aid DSP keeps on drawing power from the battery HPMIO will preserve the rechargeable battery from over discharging by forcing Deep Sleep Mode when VBAT reaches Vsafety In this mode the VHA supply is stopped SAFE MODE status bit 0 Vsafety is 2 8 V for Li Ion and 1 0 V for AgZn Battery Charging Control While in Cradle Mode HPM10 controls the charging of the attached battery The charging cycle is different for each battery type with the charging phase transition points for each chemistry voltage current temperature and time stored in OTP and available to the micro controller in Cradle mode The chemistries that are supported by HPMIO are Silver Zinc AgZn and Lithium Ion Li ion While Zinc Air ZnAir and Nickel Metal Hydride Ni MH batteries are detected they are not charged www onsemi com 13 HPM10 As shown in Figure 6 a charger state machine operates in five phases to manage the charging process e Start up SU Battery type detection OTP b
21. istor The time constant needs to be 2200 ms Cswin 0 1 uF 2 Meg Figure 2 External Connection Required for a Proper Wakeup at Battery Insertion This RC network effectively provide a high pulse of long enough duration for the wakeup block on HPM10 to latch ON and enable the DSP Since the HPM10 latch on delay is about 20 ms a pulse of about 200 ms provides a large margin to ensure that HPM10 reliably turns on During Hearing Aid Mode if the battery discharges to its end of life then the DSP or HPM10 can trigger the Deep Sleep Once in Deep Sleep the only way to wake up in case there is no button is to place in the charger Wakeup on Removal from Cradle Waking up HPM10 when the hearing aid is removed from the charger requires OTP bit button to be set high In this case VHA will be turned on If the OTP bit no button is set low HPM10 will go in Deep Sleep Mode and VHA will not be activated Shutdown Warning When the hearing aid is placed in the Cradle the output pad WARN signals the DSP that the power will soon shutdown This signal is a level shifted copy of the analog signal CH CONN see Figure 3 The time duration between the moment the WARN signal is raised to logic 1 and VHA being switched off will allow the hearing aid DSP to get ready for shut down This period of time will typically allow the hearing aid DSP to manage datalogging or mute the audio without glitches This time period can be configu
22. lt ZnAir ZnAir lt 50 gt 4 1 2 1 Figure 6 Charging Algorithm Diagram Flow Clocking HPM10 has two clock sources In Cradle Mode the CM CLK clock is coming from an internal RC oscillator This clock controls the charging process timing and state machine since an accurate time reference is required during this state This clock is used only in Cradle Mode n Hearing Aid Mode the HA CLK is either selected from either an internal RC oscillator or a divided down version of an external clock signal EXT CLK The external clock selection is automatic If a clock 1s detected on EXT CLK it will override the internal oscillator The motivation for this selection is to have a single clock in the combined system to avoid pollution on the supplies that will feed into the audio path When the external clock 1s used it must be divided down so the resultant frequency is in the same frequency range as the internal clock i e 64 kHz 2 95 The division ratios that are possible are divided by 2 4 8 16 32 64 128 and 256 3 bits The hearing aid manufacturer is responsible for setting the appropriate ratio using the CLKDIV 2 0 pins in order to use an external clock pin This can be done from the DSP or can be connected on the printed circuit bo
23. mory at customer site Power Supply Provides a clean supply to the hearing aid DSP When a Li ion battery is used a step down capacitive divider or Charge Pump is used providing a voltage between 1 4 V and 0 95 V When a AgZn battery is used a linear regulator can be used providing a 1 5 V max HPM10 can also directly provide the battery voltage to the hearing aid DSP Eg when a Zn Air battery is used or if the DSP can handle the voltage of a AgZn battery Charger Communication Interface Communicates the status of the charging process and battery voltage to the hearing aid charger and allows user interaction with HPMI10 Information sent in this mode includes Battery voltage level and charge current Charge Mode phase e e e Battery chemistry type Fault conditions Battery Life Optimization High precision current and voltage sources are used to manage the battery charge curves with the precision required to optimize battery life duration Battery Supervision Ensures that the battery doesn t fall below critical levels This helps to maximize battery life Non Volatile Memory Stores charging parameters trim codes and general product specific settings Power On and Off Management Based on a smart method between HPM10 and the hearing aid DSP Specification Table 1 ABSOLUTE MAXIMUM RATING Parameter Ms VHA I O pins VHA SWOUT DS EN EXT_CLK CLKDIV 2 0 0 5 AGZN R
24. o provide information on the battery charge as follow CCIF Pin State Corresponding Information In OTP Burn mode ATST_EN HIGH the CCIF pin is used as an external reset input active LOW This reset is necessary during the OTP READ procedure and it is to ensure that digital is in a known good state and the OTP contents have been loaded before doing the read The CCIF VBAT Veol Vsafety Hearing Aid mode Transition period pin when in input mode does not have a pull up or pull down resistor so it should not be left floating Primary Charger to HPM10 Receive The Primary Charger can use voltage modulation of VDDP to transmit data to the HPM10 HPM10 uses edge detection and AC coupling to extract the data easily without a precise amplitude requirement This helps relax the requirements on the drive signal and the loading of the VDDP line by the Charge Control block For robust pulse detection the rise fall time of the 200 mV modulation should be less than 100 us Battery Monitoring HPM10 employs two methods of battery monitoring 1 In Cradle Mode the high precision 10 bit ADC continuously measures voltage and current to the battery 2 In Hearing Aid Mode the system uses instantaneous voltage to analog comparators to perform simple detection of battery chemistry Refer to the Hearing Aid Mode section on page 19 for more information Figure 5 illustrates how the battery monitoring is done in a hearing aid syst
25. oot and CRC checking Initialization INIT Li ion pre charge trickle Li ion advanced charging algorithms Over discharge recovery for AgZn Phase 1 PH1 Li Ion Maintain a constant current and monitor the voltage AgZn Lower plateau Ag O and transition zone charging region Exit if the voltage set point has been reached or time out has occurred Phase 2 PH2 Li Ion Maintain a constant voltage and monitor the current AgZn Upper plateau AgO charging region Exit if the current set point has been reached time out has occurred Completion CMPLT Battery charging process is stopped Any faults that occurred are stored and communicated to the external charger If ZnAir or Ni MH is detected then the state machine moves to completion phase The control loop for controlling the current and voltage for the charging process consists of monitoring both current and voltage with the ADC and controlling the current supplied with a 10 bit current DAC Start up K3 Li on Lidon Lion Completion Lion CC H cv _ pI fault CH CONN 0 AgZn AgZn AgZn dp enter le E Zoned Zonet Zone2 Pa c EXT Ww gt fault fault gt fau
26. pull up resistance is less than 250 kOhm it is necessary to add an external resistor to VSS such that the ratio of pull up to pull down resistance is more than 2 5 DIV3 Step Down Charge Pump In Hearing Aid Mode the DIV3 step down charge pump CP is used when Li Ion batteries are used The DIV3 CP uses 2 external capacitors plus 1 decoupling capacitor to divide the VBAT by a factor of 3 The output impedance of the charge pump is fixed and the VHA will track variation in VBAT If VBAT is insufficient to power DIV3 CP the DIV3 CP will be shut off Based on the Li Ion discharge curve the battery is nearly discharged when VBAT 3 1V and so a threshold around 3 1 V would be acceptable for the DSP to use as a turn off threshold This is equivalent to 3 1 3 1 03 V on VHA The HPM10 turn off threshold is much lower typically 2 8 V as a fail safe in case the DSP is unable to turn off HPM10 The DIV3 CP can only be activated when in Hearing Aid Mode The input clock to DIV3 CP comes initially from the hearing aid oscillator which also is only active in HA mode After the DIV3 starts up and the DSP turns on if there is detected a clock signal on the EXT pad it will be used as the master clock in Hearing Aid Mode When using the EXT the range of frequency can be as much as 2 95 due to the limited division steps AgZn Regulator In Hearing Aid Mode the AgZn regulator can be used to limit voltage below 1 5 V when the
27. red in the OTP with a resolution of 0 5 seconds with a min value of 0 5 seconds and a max value of 127 5 seconds www onsemi com 9 HPM10 HPM10 Working Modes HPM10 has three working modes represented in the state machine below CH CONN 0 SAFE MODE 0 Hearing Aid HA Cradle Mode CM CH CONN 1 SAFE MODE 1 amp CH_CONN 0 amp SWIN 1 CH CONN 1 SAFE MODE 1 amp CH CONN 0 amp NO BUTTON 1 Figure 3 HPM10 State Machine Deep Sleep Mode A low power mode with all blocks turned off HPM10 can enter Deep Sleep Mode in one of three ways From Hearing Aid Mode when the host DSP toggles the DS EN pin high An example use case for this transition is when a program is running on the host DSP that determines that the hearing aid is not being worn or the measured battery voltage is below a specified value and puts the system into Deep Sleep Mode to save power From Hearing Aid Mode when the battery voltage drops below the EOL set point VEOL level for the battery chemistry actively being used to avoid irreversible battery damage This is when VBAT 1 0 V for AgZN or 2 2 V VBAT 3 0 V for Lithium Ion This will draw the SAFE MODE status bit to 0 From Cradle Mode when the hearing aid charger is removed in case the OTP bit button is not set Cradle Mode The hearing aid will enter in Cradle Mode when the hearing Aid is physically connected to Cradle CH CONN
28. t is not supposed to meet specification in terms of voltages currents thresholds and precision www onsemi com 4 HPM10 Table 3 ELECTRICAL SPECIFICATIONS Description Symbol Conditions mm Typ Unite Screened DIGITAL INPUT THRESHOLDS DS_EN Minimum ds_pw_min Hearing Aid Mode Triggerable Pulse Width VBAT 3 8 V HEARING AID MODE CURRENT HA CurentHi n LHAL HesigAdMode VBAT SB V amp amp wA HA Current AgZn _HA_AgZn Hearing Aid Mode 1 8 wa 3 During OTP programming the maximum VDDP value is 5 7 V This allows VDDP to be tied to VDD OTP 4 HPM10 is functional in this range but is not supposed to meet specification in terms of voltages currents thresholds and precision 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 HPM10 Internal Architecture The architecture of the HPM10 chip is shown in Figure 1 HPM10 To Charger Charge Control CLKDIV 2 0 Fom Boror Charger Communication Interface From DSP Battery Monitor From programmer 9 WN i SWN Timers Wakeup Batt VBAT Oscillators Detect to DSP lt SWoUT to DSP From DSP Configuration System Registers Batter
29. tor the WARN to determine if the hearing aid has been placed in cradle in which case the DSP should shut itself down gracefully before HPM10 cuts the power to VHA Toggle pin DS EN to logical high VHA level if it needs to put HPM10 into Deep Sleep Mode CLKDIV can be configured by the DSP through GPIO for example or through physical connection In Hearing Aid Mode voltage monitoring is used to prevent turn on if battery voltage is not acceptable and to control the output mode of the VHA supply The voltage levels and modes are as follows 1 0 V to 1 5 V The battery type could be AgZn Zn Air or NiMH A low impedance switch connects VBAT to VHA to power the DSP VHA VHA Lidon OO A 1 5 to 2 2 V The battery type is likely AgZn If pin AGZN REG EN floating then the VHA voltage is powered by a 1 5 V regulator This is to protect those DSPs that are not able to handle the unregulated AgZn voltage For those DSP that can handle maximum AgZn battery voltages the pin EN 0V will enable the low impedance switch between VBAT and VHA 3 0 V and above The battery type is Li Ion VHA is powered by a divide by 3 step down converter VBAT voltages outside of these ranges will not enable the VHA and the DSP will not be powered Note that each of these thresholds have hysteresis to ensure stable operation The following figure indicates how HPMIO monitors voltage in Hearing Aid Mode V
30. voltage to all the analog blocks Charge current when in Hearing Aid Mode Digital Interfaces The digital inputs and outputs SDA SCL and CCIF are powered from the VDDIO supply pin which can be connected to DVREG or another available supply VDDIO is not used in Hearing Aid mode The digital inputs and outputs SWOUT DS EN EXT CLK CLKDIV 2 0 AGZN REG EN and WARN are powered from the VHA Voltage References There are two bandgap voltage references on the chip One is a precision bandgap used Internal temperature Charger input voltage VDDP e VREF from BandGap used to calibrate ADC offset Power Domains The input output is divided into several independent power domains each with their own ESD clamping structures to allow flexibility in the allowed voltages that can be present on the pins shown in Table 6 Table 6 POWER DOMAIN DESCRIPTIONS VDDP DVREG Full voltage range VDDIO SCL SDA CCIF ATST EN All digital input output used in Cradle Mode VHA SWOUT WARN DS EN EXT CLKDIV 2 0 All digital input output used in Hearing Aid mode AGZN REG EN VBAT SWIN VHA CP1A CP1B Cp2A CP2B All voltages derived from VBAT VSS VSSA VSSCP All grounds are shorted together lt 2 ohms Development Tools The communication between the PC and HPM10 will be A full suite of comprehensive tools is available to assist supported by either the Promira Serial Platform from developers from the initial concept
31. wired charging this protocol will be used to facilitate an easier migration to a wireless charging mode The data rate is fixed to 2 kHz Some of the information sent in this mode is Battery voltage Current levels Ambient temperature Accumulated charge Charge mode phase Battery chemistry type Fault conditions This communication supports data transfer between the HPM 10 and the Primary Charger This physical link is the VDDP power connection Bidirectional communication half duplex is supported The communication from the HPM10 to Primary is using load modulation where the VDDP is loaded with a low valued resistor to represent a 0 The communication from Primary to HPM10 uses VDDP voltage modulation HPM10 to Primary Charger Transmit The CCIF digital signal UART type is converted into a modulated www onsemi com 12 HPM10 load on the VDDP wired supply This current modulation is superimposed on the existing current that is used to charge the battery State transitions will cause short current transient steps that need to be ignored by the Primary Charger data detector To support the HPM10 usage in a wireless recharging device an alternate interface has been provided It is composed of pad that is a digital output duplicating the raw UART signal i e not the differential encoded data The CCIF pin can be configured in the OTP to provide a static signal that can be used by the system t
32. zI In this mode the hearing aid battery is being charged Once in this state the following sequence of processes will occur The OTP is enabled and its contents are copied to internal latches After the OTP contents have been read a Cyclic Redundancy Check CRC is made by the controller If it fails the system transitions to completion phase in Cradle Mode and an error flag is set If the CRC passes the controller starts the charging process The charging process is controlled by a controller and firmware in ROM Hearing Aid Mode The hearing aid DSP power is supplied by HPM10 and there is no digital logic running on HPM10 In this mode the hearing aid is in normal operation mode and receives its supply voltage from HPM10 HPM10 can enter Hearing Aid Mode in two ways From Deep Sleep after SWIN goes high from a button press The battery voltage must be in a valid range From Cradle Mode after removed from Cradle with OTP bit NO_BUTTON 1 The battery voltage must be in a valid range HPM10 is either clocked with the Hearing Aid Mode Oscillator or with the divided EXT CLK The recommended tasks for the host DSP in Hearing Aid Mode are as follows Set the external clock division ratio if desired by driving the 3 CLKDIV pins Apply a valid clock to EXT CLK pin www onsemi com HPM10 Periodically monitor pin VHA using its on board ADC Monitor SWOUT to determine button press events Moni
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