Where connect SMPS pins when SMPS is not used.

[federico.massimi]

Hi, I'm using an STM32H745IIT6, in the package I have there are also the SMPS pins. But in my application I don't have to use the SMPS.

The question is, what should I do with these pins:

Searching the internet, I saw that someone connects them all to ground, but I haven't found any explanatory articles or clear indications. Can you tell me how should I connect these 4 pins when I'm not using the SMPS?

Thank you.

[KDJEM.1 · Accepted solution]

Hello @federico.massimi​ ,

Below is diagram from reference manual RM0399 showing different hardware configurations for power supply.

So, when the SMPS is OFF the VDDSMPS, VFBSMPS and VSSSMPS should be connected to ground and VLXSMPS should be floating.

When your question is answered, please close this topic by choosing Select as Best. This will help other users find that answer faster.

Kaouthar