Issue with STM32H747XIH6 Internal SMPS Bring-Up

Samudra · ‎2025-06-10

Dear Sir,

We are facing an issue while bringing up the STM32 microcontroller (part number: STM32H747XIH6) using the internal SMPS.

When we power the MCU through the LDO path, everything works fine, and we are able to connect to the STM32 via JTAG. However, when using the internal SMPS, the MCU does not respond and we are unable to establish a connection through JTAG.

We have attached the relevant portion of the schematics for your reference.

Could you please help us identify the issue with the internal SMPS configuration?

Best Regards,

Samudralankaiah.

mƎALLEm · ‎2025-06-11

Hello,

You need also that your hardware is configured in SMPS:

RM0399 / figure 22:

As LDO worked for you that means your hardware is configured in LDO.

Now, you need to recover your MCU as you programmed the MCU with the wrong power configuration. Read this article: How can I recover my STM32H7/STM32H7RS board after facing a power configuration deadlock?

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