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pullups on GPIO ports

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  • pullups on GPIO ports

    Am I right in thinking that on the XPORT units if I want to drive a GPIO port from an open collector source that I need an external pull up resistor. None of the datasheets mentions this explicitly, except the development board which says it has some resistors available for use as pullups.

    The ones on the development board are I think 1K resistors, which seems low compared to other pullups I have met before - for example the ones on AtMega Digital IO ports are I think 10K, but they are 5V rather than 3.3V which I suppose makes a difference. What is the recommended value?

    David

  • #2
    10K to 3.3V is OK for use with Xport and Xport Pro.

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