> > Is it OK to use the internal clamp diode of the analog input of 12F675
for
> > over voltage protection ?
>
> As long as you stay within the current limits stated in the spec sheet.

I agree, subject to the caution that you should not expect your PIC to
*necessarily* function correctly while the clamp diodes are conducting. This
condition is covered by the "absolute maximum ratings" portion of the
specification and NOT by the normal operating conditions portion. While
normal operation MAY in fact occur this is not certain and you have no
come-back whatsoever if you PIC crashes or performs in any possible manner
whatsoever under these conditions.



            Russell McMahon

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