USB port section for ESP32-S2 saola dev board

zliudr
Posts: 357
Joined: Thu Oct 03, 2019 5:15 am

USB port section for ESP32-S2 saola dev board

Postby zliudr » Sat Jan 22, 2022 11:14 pm

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 4384 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?

ESP_Sprite
Posts: 8921
Joined: Thu Nov 26, 2015 4:08 am

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

Postby ESP_Sprite » Sun Jan 23, 2022 1:52 am

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.

zliudr
Posts: 357
Joined: Thu Oct 03, 2019 5:15 am

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

Postby zliudr » Sun Jan 23, 2022 2:49 am

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 4350 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?

ESP_LJH
Posts: 384
Joined: Tue May 18, 2021 9:21 am

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

Postby ESP_LJH » Mon Jan 24, 2022 3:52 am

Yes.

zliudr
Posts: 357
Joined: Thu Oct 03, 2019 5:15 am

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

Postby zliudr » Mon Jan 24, 2022 4:31 am

Thanks! :lol:

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