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STM32 how to use VREF to Calculate the actual VDDA value

Question asked by Sasha.Liu on Feb 10, 2017
Latest reply on Feb 10, 2017 by Clive One

I am using the STM32 ADC to caputure outer voltage , while the requirement to  ADC accuracy is not very high. So I decided to use the VDDA as the reference voltage. BUT  the actually vdd added to the mcu exist deviation from each others. Is there any way to get the acutal vdda after reset.?