STM32H747XIH / STM32H743XIH Power design

fastfret · ‎2022-07-26

Hi there,

My major devices are STM32H747XIH and STM32H743XIH.

I prepare to design a board.

This board can be replaced with these two devices each other. (Two devices share this board)

As I knew about hardware, these two devices are diffenet only in SMPS pins.

These are my design. Could you help to review my design, is it correct?

I will supply power to VDDLDO 3.3V and VCAP connect 2.2uF capacitors.

SMPS pins let them float. Only use LDO supply power to Vcore.

If any comments and suggestions, please let me know.

FBL · ‎2022-10-12

Hello @fastfret,

I suggest checking RM0399 section 7.4 Power supplies, Fig22 System supply configurations, VLXSMPS should be floating.

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.

I'm out of offce with limited access to my emails.
Happy New Year!

CYANG.1 · ‎2022-10-26

Hi

VSSSMPS pin needs to be tied to ground.

Javier1 · ‎2022-10-27

oh boy, contradicting ST info

we dont need to firmware by ourselves, lets talk