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STM32F373 measuring VBAT with internal ADC1

Question asked by Andreas Fecht on Oct 3, 2017
Latest reply on Nov 20, 2017 by Zhitai Liu



I'm using a STM32F373VCT6 and I have a problem with VBAT and ADC.


I have connected a CR2032 Batterie to the VBAT-Pin.
The RTC works fine with the batterie when the main power ist lost.


But if I try to measure the VBAT-Voltage with the internal ADC1 I get always 0.


The sampling on all other channels works fine; only the ADC_CHANNEL_VBAT gives this value.


Is there anyting else to do to measure the VBAT-voltage with the internal ADC1?


I'm working with CubeMX4.22.1 and CUBE V1.9.0.


Best regards