Series resistor when using weak pull-up

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  1. - 18th October 2006, 16:55 #1
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    Sharky
    Sharky is offline Junior Member
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    Post Series resistor when using weak pull-up

    Hi, I am designing a board that is connected to a momentary switch,
    normally i just use a pull-up resister and a series resistor and a capacitor,
    the series resistor and capacitor work as a low-pass filter to suppres noise.

    See the attached drawing.


    But now I want to use the weak pull-up, so I just removed R1 and programmed RA4 to have weak-pull-up but it don't work if I still use R2!

    Should I remove R2 or just use a smaller resistor.

    Sharky
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    Last edited by Sharky; - 18th October 2006 at 17:03.
    *Let's do it*
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