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Three of the following reduce the energy per reading of a sensor design. The exception is

  • A.reading the sensor less often
  • B.increasing the resolution of the conversion
  • C.using DMA so the core sleeps during the conversion
  • D.lowering the supply voltage of the whole design

Answer: B

More resolution means a longer conversion and often a higher current, so it costs energy rather than saving it, and it is worth paying only where the extra bits are real. The other three all attack the budget directly.

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