Good Design More on (ab)use of PIC protection diodes & bad design
Dennis Plunkett email (remove spam text)
At 15:44 11/10/99 PDT, you wrote:
>Of course, if you connect up your 100V supply through your 1M resistor
>to a PIC input pin, and then measure the voltage at the pin, you WILL
>read Vcc+0.6V or so, assuming that the internal protection diodes are
Not quite so,
This will be so only after the diode (Transistor) has begun conduction.
Until this point the pin may be way way over voltage.
See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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