Is it possible that the internal voltage reference does not work if the VDDA is less than 3 V?
I try to measure the VDDA on an STM32F302R8 MCU using internal voltage reference (VREFINT) and it works fine and gives the correct results as long as the VDDA is above 3 V. Below 3V the value of the AD conversion of the VREFINT rapidly increase and a...