VREFBUF can't set to internal with new MX Version (+VDDA isolation is forced)

[rohe]

Hello everyone,

I have a project with an STM32U575VGT6. This was created with STM32CubeMX version 6.8.1. Now the project should be made compatible with the latest IDE version (V1.17.0) as part of a larger conversion action and for this purpose a migrate of the ioc was carried out (STM32CubeMX version 6.13.0).
In the original project, VREFBUF was set to ‘Internal voltage reference’ mode with ‘SCALE0’.
After the upgrade, this selection is no longer available and VREFBUF is set to ‘Disabled’ by default.
I have also noticed that since the upgrade there is the option ‘isolation Vdda’ under ‘PWR’, which cannot be deactivated.

Ultimately, this means that 0V is applied to the Vref pin and the ADC and DAC do not function correctly.
What has been changed here and what do I have to set so that my application works again?

Many thanks for your help
Robert

old Version:

new Version:

 

[rohe]

The reference manual states that VREF+ is not available for some packages and is double-bonded with VDDA.

However, the package I am using should not be affected by this (after all, it already worked with the old software version).

Could it be that there is a bug in the CubeMX software that it assumes that VREF and VDD are double-bonded in my package as well?

 

[Mahmoud Ben Romdhane]

Hello @rohe ,

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

Your request is under investigation, and I will get back to you ASAP.

Thanks.

Mahmoud

[Mahmoud Ben Romdhane]

Hello @rohe ,

Internal voltage reference is missing from the VREFBUF mode. This issue was reported (under this internal ticket 199643). I suggest that you take a look at this Thread.

Thanks.

Mahmoud