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[Dude] Running SAMD21G18 at 1.8v
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ataradov:
So it is not BOD. Something else is not working. I don't really know what it could be. The part itself works fine at 1.8V, this was tested many times.

So you will have to figure out a way to debug at voltages where it is stuck. Probably starting with my simple application would be a good first step.
ajb:
Could it be part of your other circuitry?  Are you actually using a Sparkfun SAMD Mini and trying to use the onboard regulator? That could be the problem right there.  Are you measuring the 1.8V at the MCU pins or somewhere else?
grafi:
i am design a custom board based on sparkfun samd mini. When i set the vcc=1.8v i can measure the same vcc in all pins that they are connected to vcc.

Regards,
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