ESP32 Forum

I'm re-designing an ESP32-based board to be used with the ESP-PROG. I am getting rid of USB connector and USB-UART chip.

So, two questions:

1. Is it necessary to implement both the PROG and JTAG interfaces on the target ESP32 board, or is it ok to just support the PROG interface.

2. Should the target board provide a Schottky diode on the VDD input, to protect the ESP-PROG module? (It is a self-powered board)

Thanks!

Both serial and JTAG are optional. You can have none, either or both; whatever you think you need.

Looking at the reference design, from the ESP-Prog side, I don't think there's a need for a Schottky diode, unless the power supply on your board is super-critical. There's a diode on the ESP-Prog that stops incoming 3.3V from trying to power a turned-off host, so that should be fine. From your boards point of view, without a Schottky, there is a possibility that it will backfeed the power from an attached ESP-Prog to a turned-off host; if that's worrying, better add that Schottky.

Thank you!

One more quick question: is the cable connector for the PROG interface a standard IDC connector?

e.g. https://lcsc.com/product-detail/IDC-Con ... 01936.html

Thank you!

I don't have an ESP-Prog around to check, but I'm 99.98% sure it is.