Hi Jinz,

You could add a series resistor into AN0, not too big & not too
small, say 470R. This will reduce the current flowing into the PIC
diodes from glitches. Also a diode across your current sensing
resistor to limit negative spikes, best would be a schottky as it
will keep it under 0.6V. If you don't need full range on your input
put another diode in the other direction to limit positive peaks as
they could cause latchup too.

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Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz

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