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A device's sleep current is ten times the datasheet figure. The likeliest cause is

  • A.a peripheral or a pin left configured before sleeping
  • B.the flash memory having been erased incorrectly
  • C.the supply voltage sitting slightly below its nominal value
  • D.the watchdog having been disabled in software

Answer: A

An enabled converter, a running timer, a pull-up against a driven pin or a floating input each costs tens of microamperes. Reaching the datasheet figure requires every block and every pin to be put into a defined low power state, which is a checklist rather than a single setting.

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