VREF BUFF configuration

[Fannyrsy]

Hello

I'm am working with a Nucleo WB55 and I am trying to use the ADC. I assume that the reference voltage used for the conversion is equal to 3.6V because I think that this is the default settings and because when I connect 3.3V to the 12 bits ADC input, I only get about 4040/4095.  I saw on other posts that a configuration panel is available for VREF BUFF, but it doesn't exist in my STM32CubeMX  even if I can  choose VREF BUFF as an output on VREF+ pin. 

Here is my pinout view where I can choose VREF+ as VREFBUF_OUT : 

Here is the panel of someone else where VREF BUFF can be configured : 

Finally here is mine where I can't configure VREF BUFF : 

My question is : the microcontroller i use allows to use VREF BUFF but I can't configure it in STM32CubeMX. Can someone help me on that? 

Thanks a lot,

Fanny

[Mahmoud Ben Romdhane · Accepted solution]

Hello @Fannyrsy 

First let me thank you for posting and welcome to the ST Community.

You can find the VREFBUF mode configuration under System Core, SYS, VREFBUF Mode.

Thanks.

Mahmoud.

[Fannyrsy]

Hello @Mahmoud Ben Romdhane,

Thank you a lot for your quick answer. This will help me a lot !