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Clock Switching in Always-On Component

  • US 20170213557A1
  • Filed: 04/07/2017
  • Published: 07/27/2017
  • Est. Priority Date: 02/12/2015
  • Status: Active Grant
First Claim
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1. An integrated circuit comprising:

  • one or more processors; and

    a first circuit coupled to the one or more processors, wherein the first circuit, during use;

    remains powered up during a time that the one or more processors are powered down;

    receives a first plurality of audio samples captured by one or more audio input devices during the time that the one or more processors are powered down, wherein the first circuit operates according to a first clock during the time that the one or more processors are powered down;

    detects a predetermined pattern in the first plurality of audio samples;

    causes the one or more processors to power up responsive to detecting the predetermined pattern, wherein a second clock activates responsive to the power up; and

    switches to the second clock responsive to the second clock becoming operable, wherein the switch is performed when both the first clock and the second clock are in a low phase to reduce a probability of losing an audio sample.

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