About voltage scaling 1, 2 ,3

[RN]

Hello,

I am working on Power Reduction and we are using STM32F446RE Microcontroller.

In the RM i found this,

"the regulator output voltage (around

1.2 V) can be scaled by software to different voltage values (scale 1, scale 2, and scale

3 can be configured through VOS[1:0] bits of the PWR_CR register)."

so, my question is what is the regulator output voltage at scale 1, 2 and 3. is it less than 1.2 v? if i run my microcontroller at 80Mhz, then selecting scale 3 would reduce the power consumption ?

Thanks

[T J]

How about you test it and let us know ?

if the core voltage is lower then the power will be lower.

however, you must have approx 1.2V for everything to work correctly.

( 2 transistors in series need 1.1-1.2V to work correctly)

the closer you get to that threshold, the more susceptible you will be to 'noise resets'

[waclawek.jan · Accepted solution]

> so, my question is what is the regulator output voltage at scale 1, 2 and 3.

> if i run my microcontroller at 80Mhz, then selecting scale 3 would reduce the power consumption ?

Yes.

[RN]

Thanks for this @Community member​  and @Community member​