Hi,
I was just wondering what the best way to protect a PIC I/O in an automotive application. I want to be able to detect a positive input ranging from
5-40V. The PIC is running at 5V. I have thought of a zener regulator on the input but at over such a wide voltage range means large parts to dissipate the power which I am trying to avoid. Is it safe to trust the clamp diodes in the PIC or will this lead to damage over the long term? I have been told to avoid this method.Any feedback appreciated,
Geoff