Vdda Vs Vdd Stm32l433cc

[mkozi.17]

Hi

My stm32l433cc circuit has two different LDO, one for Vdd and another for Vdda. Can you tell 

me please can i run my controller without Vdda power? I need to turn on/off analog power 

when i need it. Is it possible on stm32l433cc?

[waclawek.jan]

What does the datasheet say, in the General operating conditions table, for VDDA?

JW

PS. There are requirements for ramp-up/ramp-down when VDD and VDDA are separate. Also, lower VDDA will impact the 5V-tolerance of pins connected to analog peripherals, see VINmax for IO pins. There may be other similar effects; read the datasheet.

[mkozi.17]

Stm32f030 datasheet says Vdda "Must have a potential equal to or higher than VDD", but i got none the same about stm32l433.

So, i can use two separate LDOs?

[Tesla DeLorean]

Look at other block diagrams, typically the PLL and reset stuff is in the analogue domain.

[mkozi.17]

Datasheet says "Reset block, Temp. sensor, PLL, HSI, MSI, HSI48" is Vdd Domain

[Tesla DeLorean]

The STM32L433 Datasheet says this, take it for what it's worth..

"The VDDA voltage level is independent from the VDD voltage."