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STM32MP257 - STPMIC25 init

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Ronte.1
Associate III

‎2025-09-22 11:46 PM

Hello,

We have a custom board based mainly on stm32mp257-dk design. The sdcard supply voltage doesn't activate on STPMIC for some reason. Is the stpmic preprogrammed on the DK board or should the Rom code of the MPU activate it via I2C? 

Best Regards

Raimo

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PatrickF
ST Employee

‎2025-09-23 8:54 AM

Hi @Ronte.1 

yes, STPMIC25A on STM32MP257F-DK are reprogrammed to enable LDO7 and LDO8 in bypass (i.e. 3.3V) at power on.

ROM code will never do any I2C access.

 

To avoid this reprogramming you could also use the STPMIC25D.

PatrickF_0-1758642724488.png

Regards.

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

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PatrickF
ST Employee

‎2025-09-23 8:54 AM

Hi @Ronte.1 

yes, STPMIC25A on STM32MP257F-DK are reprogrammed to enable LDO7 and LDO8 in bypass (i.e. 3.3V) at power on.

ROM code will never do any I2C access.

 

To avoid this reprogramming you could also use the STPMIC25D.

PatrickF_0-1758642724488.png

Regards.

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.
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