External SMPS VDD12 pin supply required?

[MFail.11]

Hi,

I have to use STM32L562CEU6P on my project.

This uP has two VDD12 pin for external SMPS.

My question is simple, this SMPS supply is required or can I left this pins floating?

I don't need this feature and manual is not very clear.

Thanks in advance.

[Imen GH · Accepted solution]

Hello @MFail.1​ ,

Welcome to STM32 Community!

Please refer to RM0438 (Section 8 Power control (PWR)) 

if an external SMPS is used, these pins must be connected.

otherwise (i.e. LDO is used for Vcore) these pins can be NC.

Imen

[MFail.11]

Thank you so much, I have not seen this note at my first look.

[Imen GH]

Please select my answer as Best if it fully answered your question, so that this thread will marked as solved.