STM32L475 availability of an internal precision reference voltage for ADC conversion

[Marcel Calleja Álvarez]

ST moderator: New question split from this thread:

 

Thanks, that could indeed explain the behavior we are seeing, since we are powering Vdd with 3.3V.

Since the application requires a stable ADC reference, I would like to ask whether the STM32L475 provides any internal precision reference that can be selected as the ADC conversion reference.

[waclawek.jan]

whether the STM32L475 provides any internal precision reference that can be selected as the ADC conversion reference

 

Yes: the VREFBUF module.

It is not *selected* as ADC reference: ADC reference is *always* the VREF+ pin. The way how to use the internal VREFBUF is, that you don’t connect external voltage to VREF+ pin and you switch VREFBUF on (see the VREFBUF chapter in Reference Manual).

JW