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A brown-out detector set too close to the nominal supply in a pulsed battery design will

  • A.reset the device on every pulse as the cell voltage sags
  • B.prevent the device from entering any sleep mode
  • C.increase the sleep current of the device measurably
  • D.have no effect until the cell is nearly exhausted

Answer: A

The pulse drops the terminal voltage through the cell's series resistance, and a threshold above that trough trips repeatedly while the cell is still largely full. Lowering the threshold, or fitting a bulk capacitor, resolves it.

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