HPM10_16 Datasheet, PDF (9/18 Pages) ON Semiconductor – Power Management IC for Hearing Aids

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 VHA
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:
♦ 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 pin
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
• 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 DS_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.
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