For completeness if someone has the same problem...The limitation is mentioned in the device errata (ES0320-Rev6, Page 9):"Current injection from VDD to VDDA through analog switch voltage booster"With the workarround:"Enable the I/O analog switch vol...
No it is not enabled! I guess that was the problem, as stated in the reference manual:After I set the BOOSTEN bit the voltage dropped back down to 1.85V. Thank you very much waclawek.jan you solved it!! :)
VSSA is at VSS and GND level. The problem is that the VDDA output of the STM32L431RCI is driving the linear voltage regulator (TPS7A02) output from 1.85V up to 1.94V. The same is happening on the NUCLEO STM32L433RC-P board with external VDDA at 1.8V...