Does anybody know how to help with this question?

Surely there is a specification from Espressif whether to wash boards after reflow, or to use no-clean solder paste...

Thank you,
Connor

Hello,

After re-flow soldering, what does ESP recommend as the cleaning/washing process?

Is it OK to wash this part, or do we need to use no-clean solder paste?

Thanks,
Connor

Hello,

Regarding the ESP 32 ADC VREF issues, is VREF currently being measured at the factory and burned into the efuse?

Here is a quote from igrr on GitHub:

"Large scale: new chips produced starting from (some date)(1) will have their V_REF burned into efuse at production. Calibration code will ...

Great, thanks very much!

-Connor

1. It's only used in SDIO boot mode, which is a mode where the ESP32 does not boot from external flash but from its SDIO interface; a host machine should send it data. Because there's no firmware running at that moment, the configuration has to be done using bootstrap pins.

2. If the flash voltage ...

Hello,

I've got a few questions relating to the bootstrapping pins on the ESP module.

Specifically:

1) What is the purpose of the "timing of SDIO slave" strapping pins? I am guessing that the state of these doesn't really matter as it can also be configured in FW. But how can the flash memory ...