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Thread: Good Design More on (ab)use of PIC protection diodes & bad design
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face BY : Jim Hartmann email (remove spam text)



My experiment that caused spontaneous internal register changes was quite
simple.  Connect a negative voltage through a series resistor to an input
pin (my experiment was with PORTB, RB3 on a 16C622 series).  Raise the
current by increasing the voltage magnitude, the chip begins malfunctioning
at around 2ma.  This current reverse biases the lower "protection diode".

<OF4F64672F.E99F0E45-ON86256807.004E5B82@sk.cargill.com>

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Subject (change) Good Design More on (ab)use of PIC protection diodes & bad design

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