Is there a reference design to connect a STM32U535 to a SDHC interface ?

[DrPi]

Hi,

I'm working on a design containing a STM32U535. I need to connect it to a SDHC interface (µSDHC connector). 

The STM32U5 documentation talks about a SDMMC1_CKIN signal. It is not clear to me if this signal is always required or not. I think the documentation is not clear on this.

I do not use external transceiver and I don't need UHS-1 speed (1.8V mode).

Is there a reference design with a STM32U5 and a (µ)SDHC connector ? I have not been able to find one.

Nicolas

[KDJEM.1]

Hello @DrPi and welcome to the community;

The STM32L476G-EVAL board have a slot for microSD™ card supporting SD, SDHC, SDXC.

I recommend you referring to the board schematic and get inspired to design your PCB. 

I hope this help you.

Thank you.

Kaouthar

[DrPi]

Hello @KDJEM.1 ,

Thanks for your answer. Unfortunately, the design you reference is of no help with my problem. The µController (STM32L476G) used on this design does not have a SDMMC1_CKIN pin. So I can't deduce anything concerning the usage of the STM32L476ZGT6U signal.

Regards,

Nicolas

[AScha.3 · Accepted solution]

Hi,

>I do not use external transceiver

so rm says :

-> no need or chance to connect ckin to anything useful.

and a sd-card has these pins to connect :

>if this signal is always required or not

So obviously not required.

[DrPi]

You are right. I missed this information.

Thanks for pointing me on it.