STM32H743I Eval Board Schematic for SD card

[binu pandian]

Posted on November 13, 2017 at 05:01

Hi,

We are planning on using the STM32H753 in our design. We currently have the STM32H743 eval board with us and we have the following query regarding the sd card schematic on the user manual 'UM2198'.

Qn.: 

The sd card schematic in page in pg.60 of the user manual shows the following voltage translator being used.

IP4856CX25/C

The VCC of sd card connector, CN13 and the VSD_REF of voltage translator, M1 is connected to +2V9_SD.

I believe both the CN13 and M1 can operate at 3.3V. 

Is there any specific reason for this?

Also, if  we want only to support only 3.3V signalling (upto High speed mode, 50MHz operation), can we get rid of M1 in the schematic?

Thanks and Regards,

Binupandian S.

#stm32h7 #sd-card

[Amel NASRI]

Posted on November 14, 2017 at 12:07

Hi

binupandian

‌,

You need to follow the recommendations that we provide in the 'Getting started with STM32H7x3 hardware development' (

http://www.st.com/content/ccc/resource/technical/document/application_note/group0/e8/d8/d0/32/33/94/41/dd/DM00337873/files/DM003378pdf/jcr:content/translations/en.DM003378pdf

). The schematic of

STM32H743 eval board is an example of PCB implementation that should be respecting those recommendations.

-Amel

[binu pandian]

Posted on November 20, 2017 at 08:26

Hi,

Sorry for the late reply.

Thanks for the response.

The link you mentioned does not say anything related to our query.

This is a small form factor board and we really don't want to add more components than we need to.

Thanks and Regards,

Binupandian S.