>> Is it a good idea to put some
>> sort of electrical "fusing" between a regulated 5 volt power
>> supply and the PIC input pin(s)?

I don't think so.  I've never done it nor seen it done.  The circuit
itself should ensure that the PIC I/O current and the like is kept within
the maximum limits.  If this is done, the PIC won't draw excessive current
unless it is already broken.

Fuses are for preventing property damage and injury in case of part
failure or abuse.  They can also be appropriate to protect expensive or
difficult to replace components, but they have their own cost too.  The
economics just don't make sense for protecting PICs with fuses, especially
since a properly functioning PIC can't draw more than the rated current if
the other min/max parameters are adhered to.


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