We have developed battery operated product using STM32WLE5CC.
when device goes into deep sleep around 1.7uA current are flow normally.
During Testing of product we face an issue which is described as below.
During deep sleep of STM32WLE5CC, we removed battery from device so now slowly- slowly voltage gets down on STM32WLE5CC VCC-GND pin.
Case 1:
Voltage Down Start from 3.3V and when it reached to 1V-1.1V, we again plug battery into device and now voltage on STM32WLE5CC VCC-GND pin is 3.3V .
then we press Button on EXTI on PB3 Button, which is our external wake-up source and STM32WLE5CC wake-up start working completely.
Case 2:
Voltage Down Start from 3.3V and when it reached to 700mV - 800mV, we again plug battery into device and now voltage on STM32WLE5CC VCC-GND pin is 3.3V.
but in these condition STM32WLE5CC didn't boot again and also not react on button press on PB3 external wake-up. its goes into unknown condition.
its only react now when we restart it using reset button.
So, Please help us to solve this problem? Is Supervisor IC is suitable in this case? or any other solution I can try for this issue?
Thank You
