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Low power scan for device wake up and unlock

  • US 10,095,345 B2
  • Filed: 05/30/2014
  • Issued: 10/09/2018
  • Est. Priority Date: 05/30/2014
  • Status: Active Grant
First Claim
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1. A method for switching a device from an idle state to an active state, the device including a touch panel, a microcontroller, and a processor, the method comprising:

  • in the idle state;

    powering on the microcontroller;

    determining if a first set of changes in capacitance associated with one or more sensing nodes, included in a plurality of sensing nodes, match a first pre-determined criteria over a sequence of measurements using the microcontroller;

    determining if the first set of changes in capacitance match a second pre-determined criteria over the sequence of measurements using the microcontroller; and

    after determining if the first set of changes in capacitance match the first pre-determined criteria over the sequence of measurements and determining if the first set of changes in capacitance match the second pre-determined criteria over the sequence of measurements;

    in accordance with a determination that the first set of changes in capacitance match both the first pre-determined criteria over the sequence of measurements and the second pre-determined criteria over the sequence of measurements, discarding the first set of changes in capacitance;

    in accordance with a determination that the first set of changes in capacitance match the first pre-determined criteria over the sequence of measurements and do not match the second pre-determined criteria over the sequence of measurements, generating and transmitting a signal from the microcontroller to the processor;

    in accordance with a determination that the first set of changes in capacitance do not match the first pre-determined criteria, discarding the first set of changes in capacitance;

    wherein;

    the processor is a hardware component separate from the microcontroller,the first pre-determined criteria are between first and second threshold values, the first and second threshold values being different from each other, andthe second pre-determined criteria are between third and fourth threshold values, the third and fourth threshold values being different from each other and different from the first and second threshold values.

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