ESP-WROVER-KIT SCH-3: IO2 pulled up and down for SD card

jcsbanks
Posts: 305
Joined: Tue Mar 28, 2017 8:03 pm

ESP-WROVER-KIT SCH-3: IO2 pulled up and down for SD card

Postby jcsbanks » Fri Mar 16, 2018 11:51 pm

https://dl.espressif.com/dl/schematics/ ... _SCH-3.pdf

IO2 has 5K to ground and 10K to 3V3 near the SD card.

I thought that IO2 is to be pulled up for SD card operation whereas this would sit at about 1.1V.

IO2 uses a third transistor in the auto program circuit. Is this so that IO0 and IO2 can be used individually after boot rather than connecting them together and losing an IO pin?

WiFive
Posts: 3529
Joined: Tue Dec 01, 2015 7:35 am

Re: ESP-WROVER-KIT SCH-3: IO2 pulled up and down for SD card

Postby WiFive » Sat Mar 17, 2018 12:47 am

You will notice the 5k is listed as NC which means not placed.

jcsbanks
Posts: 305
Joined: Tue Mar 28, 2017 8:03 pm

Re: ESP-WROVER-KIT SCH-3: IO2 pulled up and down for SD card

Postby jcsbanks » Sat Mar 17, 2018 8:19 am

Thanks!

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