nrf52840 locks up if battery too low, does not recover after charging.

RE: nrf52840 locks up if battery too low, does not recover after charging.

Scerion — Fri, 05 Jan 2024 07:59:55 GMT

I did a hardware fix for this problem - the battery power now goes via a resistor to the MCU. And the charging station can short out the VCC pins on the other side of the resistor from the battery to force it out of brownout. This saved adding extra hardware to monitor the voltage etc on the PCB, as there was not enough space for this..

RE: nrf52840 locks up if battery too low, does not recover after charging.

Simonr — Thu, 12 Oct 2023 09:25:54 GMT

Please check out this case and the two linked cases there for a more in-depth explanations on how the low power and brownout resets behave: nrf9160 Lockup state with reset low / brownout

I think the best way around this would be a power supply supervisor chip so you will be able to get the device up and running after a brownout in this case.

Best regards,

Simon