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Low-power activation circuit with motion detector

  • US 10,079,600 B2
  • Filed: 09/30/2016
  • Issued: 09/18/2018
  • Est. Priority Date: 01/14/2011
  • Status: Active Grant
First Claim
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1. A circuit, comprising:

  • a sensor element configured to output a sensor output signal corresponding to a sensed quantity to a digital difference detection circuit;

    wherein the digital difference detection circuit comprises;

    a digital measurement element configured to track the sensor output signal and generate a digital signal therefrom;

    a digital storage element configured to store one or more previous digital signals corresponding to the sensor output signal generated over time;

    a difference detector configured to detect a difference between a current digital signal and at least one of the one or more previous digital signals, wherein if the difference is larger than a digital reference level, the difference detector causes an activation signal generator to generate an activation signal that awakens a system from a sleep mode or a low-power mode; and

    one or more switches connected between the sensor element and the digital measurement element upstream of the difference detector.

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