Hello
I experienced a bad problem with my micro controller STM32F103RBT6. after many times of working on a board say about 1 month the MCU VDD-GND got short circuited. After removing the MCU from board I found that VDD_GND pins of MCU are short. I checked the 3.3V Regulator output and other power sources and found nothing out of operation condition. There was not excessive current consumption or over voltage on IO pins. Now the board is woking with new MCU. Has any body faced such a problem ever? what makes MCU to break?
Possibility for drawing IO pin about 2V below GND in case of user mistake.
that's a baddie. look at "absolute maximum ratings" in the datasheet. They do not use the word 'absolute' without reason.
Erik