Static discharge


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    Quote Originally Posted by Gusse View Post
    Hi Picster,

    To protect HW, use some ESD protection components (varistor, TVS, etc..) and then add some small serial resistor (~20-40 ohm) in series in front of all inputs you need to protect. Use low Vbr ESD components, ~7-14V are OK. It will ensure that residual voltage will not burn PIC input.

    To protect SW, use timeout(s) in input fuction(s) to filter out disturbances. If input still get triggered due to ESD then make sure that SW will accept only reasonable input strings.

    If you have any interrupts, make sure that INT sources have filtering and SW can recover even if INT was due to ESD disturbances.

    What kind of application you are building? And to which kind of environment?

    BR,
    -Gusse-
    The app is a monitoring device, to log switches (sensors) in a mechanical room environment. I figure a twisted pair should avert much of the problem, but when the circuit is first connected to the wire going to the field switches, there may be some static electricity discharged by the installer. It's battery operated, so I don't have to worry about power supply spikes generated by other equipment on the mains at least.

    Picster
    Last edited by picster; - 9th April 2010 at 13:07. Reason: blah blah blah

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