Ved
May 13 2008, 6:27 PM
hey just a curious question, does a -ve 5v at the microcontroller pin do any damage to it?? im using a zero crossing detector as an interrupt & im gettin square pulses of 10vpp
Chiru
May 14 2008, 2:24 PM
Dear Ved, use a diode to get the +ve half for zero crossing detection.
Controller pins, in general, are meant to operate in the positive side with respect to GND. A 10% in the reverse polarity may destroy the chip. There may be exceptions for a particular controller and particular pin.
Consult the Absolute Maximum Ratings in the data sheet for that chip, to be sure.
Controller pins, in general, are meant to operate in the positive side with respect to GND. A 10% in the reverse polarity may destroy the chip. There may be exceptions for a particular controller and particular pin.
Consult the Absolute Maximum Ratings in the data sheet for that chip, to be sure.
Ved
May 14 2008, 5:12 PM
k thnx dude, simple solution i knw, just found out an hr back tht the -ve voltage causes damage....