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Running a 3.3V STM32F0 on 6.5V

Question asked by David Koster on Mar 31, 2018
Latest reply on Apr 2, 2018 by T J

I'm using an STM32F0 in a high volume low power project running on a LIR2032 that can be charged via USB. The STM is specd at 2.4 - 3.6V, with 4.0V as the absolute maximum. When the battery is fully charged however the voltage will be 4.2V, 0.6V out of spec.

 

Now, if I power the device with 6.5V for a few days it actually still runs fine, except for a drawing scary high currents (81uA in standby compared to 3.12uA on 3.3V). What exactly happens when you apply a too high voltage to a device like this, and what are the actual risks?

 

Thanks in advance!
David

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