ESP32-PICO-KIT V3 -- Strapping SDIO set to 1.8v incorrectly?

[hassan789]

Hi,
I am testing the ESP32-PICO-KIT V3 eval boards. I see that the Strapping for the SDIO is set to 1.8v; however the ESP32-PICO-KIT V3 is using a 3.3v integrated flash.

Is this a mistake in the schematic? It should be a pull-down...

sch:
https://dl.espressif.com/dl/schematics/ ... ematic.pdf

pico data sheet, see section 2.3
http://espressif.com/sites/default/file ... eet_en.pdf


Thanks

[WiFive]

Maybe, although it is marked as NC. It is possible there will be a version of pico with 1.8v flash.

[hassan789]

Didn't notice the NC! So how does it even know to power internal flash at 3.3v?
The note at section 3.2 in the PICO datasheet, says it must be 0v.

[WiFive]

Gpio12 has internal pulldown, see strapping pins section of datasheet

[hassan789]

just realized that! thanks

[rudi ;-)]

Didn't notice the NC! So how does it even know to power internal flash at 3.3v?
The note at section 3.2 in the PICO datasheet, says it must be 0v.

don't forget
On SIP package, VDD_SDIO Domain ( 1V8, 3V3 ) is same in this PICO as SIP
you can*t use VDD_SDIO DOMAIN from intern LDO ( i hope there comes a change extern pSRAM, extern SPIFLASH, DEEP_SLEEP, ULP ..)
cause it is NC too ( it is not break out from SIP outside to a pin that you can use if for ) you have to use then own or the 3V3 option from board.

sip_SDIO_NC_too.png (261.8 KiB) Viewed 7509 times

best wishes
rudi


edit: but i can confirm successful:
you can use all 3V3 externals ( pSRAM, SPIFLASH) very well with this SIP (3V3) version
so do not worry - pSRAM 3V3 works great
DOOM on PICO D4 gives me no problem with 3V3 pSRAM