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STM32L496 SMPS usage confusion

Linas L
Senior II

It is not very clearly writen how to use external SMPS.

Do I need to set any registers or anything like that ?

My system will run at 81MHz, and i want to reduce power consumption. I have DCDC and Switch control. IT looks like enabling DC/DC reduces current two times, but do i have to set any registers ?

As much as i looked into datasheets and examples it looks like it sets internal voltage scale to 1 (lower) and enables DC/DC, that means LDO is creating 1V and DC/DC is generating 1.2V, and that means all the current goes from DC/DC converter ?

Am i right, or i need to do something more ( At the moment i am using voltage scale 2)

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