ESP32 Forum

Hello,

I've made my first schematic for a sensor fusion PCB based on ESP32-H2. I'd like to get feedback on:

• Overall schematic,

• Specifical feedback on the following:

• Is the EN(Pin 8) pin energised correctly?

• Are the TXD0 (Pin 31) and the RXD0 (Pin 30) needed to "flash" the firmware during production?

• Are there any pin(s) that I should expose (GPIO9/any) to put the device in the Debug mode/Flashing mode?

• Can the pins IO0-IO3 take digital interrupts?

• I've to change the I2C pins to IO4 and IO5. Can you confirm that we can map these in Firmware?

• Using USBD+ and USBD-, can you confirm we can do line-by-line debugging in ESP-IDF for Matter?

Attaching the Schematic for your reference.

Thank you for your help, in advance.

If any, check your Kicad ERC warnings; half of them tend to be bogus but easy to fix (e.g. by adding the correct pwr_flag indicators) but others are really important. For instance, the red arrow indicates your ESP32-H2 module isn't getting power because the 3v3 input is only connected to a capacitor.

Also, where do you get the idea to power the -H2 from a CR2032 from? I doubt that will work: first of all, a CR2032 outputs a nominal 3.0V, which is the minimum the ESP32H2 needs to function. If the battery voltage drops by even a little bit, the ESP32-H2 will not be run in-spec anymore. Secondly, the datasheet says you need a power supply of at least 350mA; I doubt a CR2032 is able to deliver that without the voltage dropping to almost nothing.