We are on the second generation of prototype here.
On the first generation I had an MCU fail for reasons I couldn't trace. This was from a set of six.
I have now powered seven of the second generation two have had MCU failures. The second failure was on the prototype's initial turn on. No code had been loaded into it. A hole blew out of the part when power was applied.
All failed parts then shunted the VCC to ground with a low impedance, less than 100 ohms.
I have included part of our schematic. Do you see anything that could explain this failure?
Best regards,
Bill Grimm - Zdiode
