Hi
We have an RTC chip that is normally feed with the main supply on the PCB but we also want it to be feed with battery backup when main power disappear.
Is there a chip that can charge a standard (like NiMh) rechargeable button cell battery and also switch between the main supply and the battery?
When the main supply is available the chip is feeding the RTC chip with the main supply and recharging the button cell.
When main supply disappear the chip switch, seamless to the battery as a power supply to the RTC chip.
I have a faint memory of seeing such chip somewhere but can not recall it's name or number, I guess there are a lot of them.
PS
The main supply will still feed the normal power connector of the RTC but this chip will be connected to the battery pin of the RTC
DS
Regards
We have an RTC chip that is normally feed with the main supply on the PCB but we also want it to be feed with battery backup when main power disappear.
Is there a chip that can charge a standard (like NiMh) rechargeable button cell battery and also switch between the main supply and the battery?
When the main supply is available the chip is feeding the RTC chip with the main supply and recharging the button cell.
When main supply disappear the chip switch, seamless to the battery as a power supply to the RTC chip.
I have a faint memory of seeing such chip somewhere but can not recall it's name or number, I guess there are a lot of them.
PS
The main supply will still feed the normal power connector of the RTC but this chip will be connected to the battery pin of the RTC
DS
Regards