ESP32-WROOM-32 Power On Problem

[phorena_bob]

A problem was found on our ESP32-WROOM-32 chipset-based board. The program was successfully download and run. However, when we power up the device, it do not run until we press the reset button. The problem was found in Ardurio and IDF environment. Can anyone help me? Thank you!

[ESP_Sprite]

Can you post the circuit you're using? Specifically, what is the logic around the EN pin of the ESP32 module?

[phorena_bob]

Capture2.PNG (6.93 KiB) Viewed 4290 times

Capture1.PNG (27.44 KiB) Viewed 4290 times

The schematic is attached

[ESP_Sprite]

Possibly your power-supply rise time is too slow for the RC circuit on the reset line to do its work properly. Can you try changing C77 to an 1uF capacitor?

[phorena_bob]

no. The capacitor was changed but it is the same. Any other solutions?

[ESP_Sprite]

In general, perhaps it's useful to use a scope to measure the waveforms on the EN and the 3V3 pin on the module? You can check the ESP32 datasheet, iirc there's a graph in there showing what the waveforms should look like.