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An internal pull-up left enabled on a pin driven low externally wastes

  • A.nothing at all
  • B.only leakage current through the pin
  • C.the pin's full drive current
  • D.the supply voltage divided by the pull-up resistance

Answer: D

A 40 kilohm pull-up on a 3.3 volt rail passes about eighty microamperes continuously, which dwarfs the sleep current of the whole device. Auditing every pin's configuration is part of getting a low power design to its datasheet figure.

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