ESP32 Forum

Hi,

Is anyone can answer me this question？

According to the description on Page 26 of ES32 Hardware Design Guidelines V2.1,
"1. Set the module to UART Download mode by pulling IO0 (pulled up by default) and IO2 (pulled down by default) low. The chip IOs are pulled down internally by default."

However, IO2 on ESP32-DevKitC or ESP32-PICO-Kit is floating, only IO0 is connected to the related circuit. Can anyone explain this?

Thanks.

Io2 has internal pulldown so as long as you do not pull it or drive it high it will be read as low

Oh, yes, thanks a lot for your explanation.