CC3300: Are Pull-ups resistors needed for CC3300 SDIO?

Gibbs Shih

Expert 4825 points

Part Number: CC3300

Hi, Dear Expert

I use AM6231 sdio2(mmc2) connect to CC3300 SDIO.

Are pull-ups resistors needed for SDIO interface?

What's the recommend PU resistor values?

Many Thanks

Gibbs

over 1 year ago

+1 Jonathan Cohen over 1 year ago

TI__Expert 3290 points

Hello Gibbs,

Yes the SDIO lines should be pulled up, something around 10k ohm is sufficient. Note that if you are using a bidirectional level shifter on your design, they normally have internal pull ups which will mean you don't need additional pull ups.

In any case, please reference the CC33xx Hardware Integration Guide for more information.

Regards,

Jonathan

Wi-Fi

Wi-Fi forum

CC3300: Are Pull-ups resistors needed for CC3300 SDIO?