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Input Resistance Model for GPIO in 28022

Andrew Dai
Prodigy 70 points


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  • 0
    TI__Expert 8500 points

    Andrew,

    Assuming the output buffer is not turned on you have a very high input impedance - probably in the Mohms range - discounting the pullup/down circuit. The pulls are active circuits so the specs are given in terms of current source/sink, not resistance. These numbers are in the datasheet (section 6.3 - pullups are typically around -140uA). The input capacitance is given in this same section (typ 2pF). This is pretty much it.

    Regards,
    Dave Foley