HPM10 Power Management IC for Hearing Aids
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.
●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) memory 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 HPM10.
▲Information sent in this mode includes:
◆Battery voltage level and charge current
◆Charge Mode phase
◆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 (OTP): 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.
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Datasheet |
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Please see the document for details |
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WLCSP29 |
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English Chinese Chinese and English Japanese |
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March, 2019 |
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Rev. 7 |
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HPM10/D |
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287 KB |
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