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Thread: Good Design More on (ab)use of PIC protection diodes & bad design
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face BY : 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
>functioning...
>
>BillW
>
>

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.


Dennis

<3.0.32.19991012095113.006bf9ec@huey>

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

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