> There is another spec that says input clamp current (IIK (VI 
> < 0 or VI > 
> VDD)) is +-20mA.  (This is the 18F1220/1320 datasheet FWIW.)  
> I presume 
> this doesn't mean the PIC clamps the current to +-20mA... 
> what does it 
> mean, exactly?

It is probably in the 'absolute maxima' section, which means that the
PIC won't be destroyed immediately. It certainly does not mean that it
is guaranteed to work properly, or that it will survive long-term
exposure to that current.

How about using a PC814?
http://www.it.lth.se/datablad/Display/opto/pc814.pdf

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 


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