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JMJEngineeringConsulting
JMJEngineeringConsulting
Associate
August 10, 2020
Question

Operating SD Card at 1.8V directly

  • August 10, 2020
  • 1 reply
  • 4254 views

This post: https://community.intel.com/t5/Intel-Makers/Low-Voltage-Signaling-SD-Cards/td-p/490563 seems to imply that newer SD cards can operate directly at 1.8V with no translation to 3.3V. Can anyone confirm if STM32H743 supports this?

If so, does the microSD card still require a 3.3V power rail, or can it directly operate at +1.8V? I have not been able to locate a datasheet for the SanDisk A2 device mentioned in the link above.

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1 reply

Peter BENSCH
Peter BENSCH
ST Technical Moderator
August 11, 2020

Yes, the STM32H743 supports this, as you can read in the reference manual RM0433, section 55. Please check all the 82 pages related to that interface.

No, the MicroSD requires its own voltage, i.e. maybe operates directly at 1.8V. As an example running at 3.3V you could also check the schematics of the evaluation board.

Good luck!

/Peter

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