Brown Out reset

sumesh
Posts: 10
Joined: Fri Dec 22, 2017 12:11 am

Brown Out reset

Postby sumesh » Fri Apr 06, 2018 7:24 am

I am encountering an issue with ESP32 hardware brownout detection and reset.

Scenario: i have some bulk capacitors on the 3.3V power supplies to be able to send out "I am dying" message while power is going away.

if the board gets powered back, before the capacitor gets fully powered down ( 1.4V ), the ESP32 doesn't reboot.

is there a way to set the ESP32 to shutdown before it is unsafe to operate or this is a bug?

ESP_Sprite
Posts: 2914
Joined: Thu Nov 26, 2015 4:08 am

Re: Brown Out reset

Postby ESP_Sprite » Sat Apr 07, 2018 3:27 am

I think the hardware design guidelines suggest using an external reset circuit in case of slowly rising supply voltages (like you have) as the brownout detector isn't enabled at startup and doesn't reset the ESP32 by itself.

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