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STM32F030C6 Supply voltage sensitivity

Question asked by seb on Dec 12, 2015
Latest reply on Dec 13, 2015 by seb
Hi there,

I am using a STM32F030C6 behind a buck stepping down a voltage to 5,5V, then a LDO regulating to 5V and finaly a LDO to regulate a 3,3V for the STM.

At the scope, the 3,3V is almost clean. Still having some 80mV spike due to stepping down.

The problem is that the STM run the program for about 200ms and then an hardfault is triggered. The program is actually doing nothing => Nothing is supposed to happen at t0 + 200ms. 

I made some investigation, and I found out that the STM32 is running fine with a 5V from USB instead of the 5V of the first LDO.

Hence, I wonder if the problem can come from a "voltage supply" problem? And why it triggers an hardfault? (this device does not even have a PVD, only POR/PDR)

Thank you very much for your answers,