PIC sinking voltages higher that Vdd???

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  1. - 27th February 2007, 09:26 #1
    Ioannis's Avatar
    Ioannis
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    So, if one is in doubt, take the multimeter and check for a diode on pin RA4 to Vdd!

    Ioannis
    www.signalcom.gr
  2. - 27th February 2007, 09:52 #2
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    Quote Originally Posted by Ioannis View Post
    So, if one is in doubt, take the multimeter and check for a diode on pin RA4 to Vdd!

    Ioannis
    Or put a 10k resistor between RA4 and +12v and measure the voltage.

    If its 12v then no diode, if its 5.3-5.6 then there is a diode.
    Keith

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  3. - 27th February 2007, 10:15 #3
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    Quote Originally Posted by Ioannis View Post
    So, if one is in doubt, take the multimeter and check for a diode on pin RA4 to Vdd!

    Ioannis
    How much current does your multimeter use for the test ??? more or less than 500µA ???

    Good question ...

    Alain
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  4. - 27th February 2007, 11:03 #4
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    Hmm, few times I 've placed PIC's reverse direction on their sockets and thay got hot but not destroyed! Of course to be sure these PIC's are only in the lab for testing and never used for a commercial product...

    Ioannis
    www.signalcom.gr
  5. - 27th February 2007, 20:39 #5
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    Hey. Thanks for your answers. I have no idea how much current my multimeter uses to test for diodes....
    Yeah, ssame here. If yuou connected the other way round, the just get hot, but they dont fry
    I suspect their life could be shorten, though....
    Thanbks again.
    Manuel

    PS I think i will use PA.4. Thanks for your help!!!
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