PIC sinking voltages higher that Vdd???

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  1. - 26th February 2007, 10:10 #20
    Acetronics2's Avatar
    Acetronics2
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    Hi, Picmen

    Pic Inputs clamp Diodes are rated @ 500µA ...

    So, applications that limit the input current @, say 50µA ( good safety margin !!! ) can be done.

    That includes sensing Mains through a 4.7 MOhm 1/2 W or 2 x 2.2 MOhms 1/4W in series ( care to the max voltage across the 1/4W resistors : 250 v PEAK )

    I have built lots of 8 Pïns Pics working on mains as zero voltage switches or dimmers ...

    BUT Remember TOCKI or MCLR pins DO NOT HAVE the VCC Clamp diode : an external diode has to be added then ...
    and it's no pain if a clamp diode is already built in the package !!!

    Alain
    Last edited by Acetronics2; - 26th February 2007 at 10:29.
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