ESP32 S3 MINI, straping gpio18?
Posted: Fri Sep 15, 2023 5:11 am
by beckmx
Hello guys, I recently designed a custom pcb board for the esp32s3 mini, I have the basics from what i can see, but i noticed in the devkit schematic design there is a pull up resistor on gpio18, I looked in the datasheet but couldnt find anything related, I found a similar situation with the esp32_c3 that needed a pullup on gpio8, is this also the same for the esp32_s3_mini gpio18?
Greetings!
Re: ESP32 S3 MINI, straping gpio18?
Posted: Fri Sep 15, 2023 5:29 am
by ESP_Sprite
There's actually no pullup on that pin; note the Espressif schematic marks it as NC meaning there is a footprint for it on the PCB but no component should be fitted there. I'm unsure why they added that footprint.
Re: ESP32 S3 MINI, straping gpio18?
Posted: Fri Sep 15, 2023 3:15 pm
by beckmx
I manually soldered my ESP32_s3_mini but I am not able to get any "serial" signal, if you have some minutes to check my schematic,do you see anything different in here?
- Schematic
- Screenshot 2023-09-15 at 9.12.35.png (212.53 KiB) Viewed 3087 times
I am very familiar with esp32 but this model in particular is getting hard to make it work for me.
Thanx for your time
Re: ESP32 S3 MINI, straping gpio18?
Posted: Fri Sep 15, 2023 11:58 pm
by ESP_Sprite
- Not sure if you populated U2 or U3, but a HT75xx is not powerful enough to power an ESP32.
- You need a proper RC network on the EN pin.
Generally, I'd suggest keeping to the
hardware design guidelines.