ESP32 Forum

Posted: **Thu May 20, 2021 10:40 am**

Hi there,
We are currently having an issue with flashing the module from a host MCU.

Can someone confirm what the operating voltage of the internal flash chip is, 3.3V or 1,8V?

I checked the technical reference manual, esp32 datasheet and the solo-1 datasheet but there is no mention of the operating voltage for the solo 1 module, is there an official reference for this please?

I want to make sure we have the bootstrapping for MTDI configured correctly.

Thanks

Posted: **Fri May 21, 2021 9:27 am**

I've scoped the MTDI pin on our design and its pulled to GND by default, which I assume is the correct voltage for the integrated flash on the SOLO-1 modules.

Any thoughts on this?

ESP32 Forum

ESP32-SOLO-1 flash failure - possible VDD_SDIO issue

ESP32-SOLO-1 flash failure - possible VDD_SDIO issue

Re: ESP32-SOLO-1 flash failure - possible VDD_SDIO issue