Question

Does a bit set in a port's OVTDIS register disconnect the corresponing I/O pin's clamping diodes from the supply rail? If so, does that affect the absolute maximum input voltage rating for the pin?

Answer

The answer is yes in both cases.

 

On EFM32 Series 1 and EFR32 devices, any GPIO pin for which the corresponding OVTDIS bit is set should be considered to have an absolute maximum input voltage of IOVDD + 0.3V.

 

Raising the pin above this voltage will drastically increase its leakage current and is not safe for long-term reliable operation.

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