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The figure that decides whether a battery-powered design can use a part's deep sleep mode is often not the sleep current but

  • A.the size of the flash memory on the device
  • B.the maximum clock frequency of the core
  • C.the time and energy needed to wake and re-initialise
  • D.the number of separate interrupt sources the part is able to support

Answer: C

A mode that saves a microampere but takes ten milliseconds and a full re-initialisation to leave is a loss for anything waking every second. The energy per wake-sleep cycle, not the static current, is what has to be compared.

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