ESP32H2 usb boot after powron

gaysin1111
Posts: 4
Joined: Wed Jul 21, 2021 9:41 am

ESP32H2 usb boot after powron

Postby gaysin1111 » Mon Sep 02, 2024 5:22 pm

when power is supplied (smoothly) from a laboratory power source, for example, it goes to the USB bootloader. I will say right away, the connection diagram according to the datasheet is similar to DEV BOARD schematocs. IO8 IO9 are pulled up through 10 kOhm to Vcc, EN through 10 kOhm + 1 μF.
At the same time, if you pull the reset after powering up, the μF starts. After which the bootloader goes to UART normally, is flashed, works.

ESP_Sprite
Posts: 9757
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32H2 usb boot after powron

Postby ESP_Sprite » Tue Sep 03, 2024 2:41 am

Are you sure you don't have a capacitor on IO9, e.g. to 'debounce' a button that might be on there?

gaysin1111
Posts: 4
Joined: Wed Jul 21, 2021 9:41 am

Re: ESP32H2 usb boot after powron

Postby gaysin1111 » Tue Sep 03, 2024 4:48 am

here is my schematics for ESP32H2 tests.
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