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USB port section for ESP32-S2 saola dev board

Posted: Sat Jan 22, 2022 11:14 pm
by zliudr
I am referring to ESP32-S2 Saola-1 schematic:

https://docs.espressif.com/projects/esp ... -v1.2.html

My board isn't the latest so it has a single microUSB. The USB port section looks like this:
Screenshot 2022-01-22 170732.jpg
Screenshot 2022-01-22 170732.jpg (61.09 KiB) Viewed 4901 times
I see there are 4 resistors in the right side box. The two on top and bottom are connecting D- and D+ to CP2102, correct? If I remove them I can access the S2 USB-OTG via onboard microUSB connector because the middle two 0-ohm resistors connect the S2 USB OTG D- and D+ to the microUSB connector, also with 22pF caps (probably S2 USB OTG needs this value). Correct?

Re: USB port section for ESP32-S2 saola dev board

Posted: Sun Jan 23, 2022 1:52 am
by ESP_Sprite
Yes, but note the two middle resistors are marked NC and as such not placed. Best solution is to move the resistors from the outer to the inner positions.

Re: USB port section for ESP32-S2 saola dev board

Posted: Sun Jan 23, 2022 2:49 am
by zliudr
Thanks. I understand now. Here is a photo of my board on the official website:

Image

It's hard to see the resistors. I have the resistors under a magnifier:
IMG_20220122_204312 (2)_LI.jpg
IMG_20220122_204312 (2)_LI.jpg (1.57 MiB) Viewed 4867 times
The microUSB port is at the bottom of the image. I highlighted one resistor in blue and its new location in orange. So I need to move this resistor from blue to orange (also turn around), correct?

Re: USB port section for ESP32-S2 saola dev board

Posted: Mon Jan 24, 2022 3:52 am
by ESP_LJH
Yes.

Re: USB port section for ESP32-S2 saola dev board

Posted: Mon Jan 24, 2022 4:31 am
by zliudr
Thanks! :lol: