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GPIO Pull-Up/Pull Down Values

Paul Joseph
Expert 2795 points

I need to understand for the GPIO what are the values of the PU and PD resistors, from the leakage current specification, I can guess they are in the range of 33K – 90K.

Could someone please qualify this?

  • 0
    TI__Guru 63595 points

    You are correct the resistance is in the range of 13K - 200K ohms.

    The leakage parameters provided in Table 3-13 of the AM335x Data Sheet is the best way to define the range of internal pull-up/pull-down resistance.  Internal pull-up/pull-down resistors are implemented using weak transistors which have a wide range of resistance over process, voltage, and temperature.  Since the internal resistors are implemented with transistors they are not linear which causes the resistance to be a function of voltage.

    Regards,
    Paul