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Light detection circuit for ambient light and proximity sensor

  • US 8,097,851 B2
  • Filed: 05/27/2011
  • Issued: 01/17/2012
  • Est. Priority Date: 10/22/2008
  • Status: Active Grant
First Claim
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1. A circuit for implementing an ambient light sensing mode and a proximity sensing mode, comprising:

  • a light sensor;

    a light source; and

    a controller coupled to the light sensor and the light source, wherein the controller is configured to process outputs from the light sensor before and after the light source is energized to obtain an ambient light level output and to compare the ambient light level output with an output from the light sensor when the light source is energized to implement the proximity sensing mode.

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