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something about the power supply of STM32H745IIT6(LQFP176)

RZHU.1
Associate III

I am designng my own board with STM32H745 and I am confused about the SMPS so I do my work according to my STM32H757I-EVAL board.

I have finished the design of the ciucuit about power supply but the VSS pins. I found the several VSS pins of my evaluation board are connected to "SMPS GND", why? Does it necessary?0693W000003RRbyQAG.png

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