I'm developing a custom board with the IMX6SL processor, based on EDK.
I will use integrated RTC and tamper detection, which both required an external coincell. I need some help to choose the coincell correctly. My system will run only when it is supplied from a wall USB adapter, so no other battery available.
- It seems that's when system is off, it drains up to 250µA from the coincell, which is huge. A standard rechargeable CR2032 capacity is 40mAh. So, the RTC can work 6 day before being out of power. After that, I will need to plug the board to my wall adapter to make the board working again : is the low voltage of the coincell a problem?
- PF0100 integrates a Lithium charger, which current charging is 60µA, so it will take something like 27 days to charge the RTC's coincell?
- Finally, is the first case, when battery will be out of power, what will happen with tamper detection when I will bring back the power?