ESP32 Forum

Hello,

From what I understand from the datasheets, there is a risk to have boot failure if the esp32 is connected to a battery / power source that is near the voltage limit of the esp32, and if no supply voltage supervisor is used to control the EN pin.

However, I was wondering exactly what is the criticality of having the esp32 switching on/off and having power on reset failure.

1) Is there a risk to have the esp32 stuck ?
If for example, there is a boot failure, and that the supply voltage becomes stable, will the esp32 will be rebooted automatically by the internal watchdog ?
Is there a risk to have the watchdog badly initialized because of a bad power on reset, and having the esp32 that will stay into its error without being rebooted ?

2) Why is it a problem ?
I understand that the ESP32 will continuously switch ON and OFF, and have power on failure.
On my application (stateless, reading sensors data and sending them to a server over wifi), I don't however see why it is a problem.

Thanks,
Charles

Hi,

To avoid that (critical low voltage) we have the Brownout detector. See reference: Brownout

You can change the voltage threshold in the project configuration using menuconfig.