Question about internal Vref of STPM32 chip

[ckim.2390]

STPM32's document DS10272 states that Vref is 1.18V.

However, if you install the "STPM3x Evaluation Software" program provided by ST and select the EVAL-STPM32 board in Configuration, Vref is set to 1.2V.

which value is correct?

In addition, if you look at the list (ppm/C) of Vref Temp Compensation in the "STPM3x Evaluation Software" program, you will see the picture below.

 

It differs from Table8 in document DS10272.

Is there a reason the two are different?

[Peter BENSCH · Accepted solution]

Oops, thanks for pointing that out! Apparently the software has not yet been updated to the new parameters and still shows the parameters of the older revisions of the data sheet.

You can change the reference voltage from 1.2V to 1.18V in the software.

The displayed value of the temperature compensation is now indeed incorrect, but the coding of the steps remains the same. If you take this into account, you should still be able to work with the software.

We ask for forgiveness for the not yet updated software.

Regards

/Peter

[ckim.2390]

thank you so much for the answer

Thanks, my question has been solved.

STPM3x EVAL BOARD related documents (AN4470, UM2066...) and Metrology library are also written with Vref calculated as 1.2V.