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Audio I O headset plug and plug detection circuitry

  • US 9,301,045 B2
  • Filed: 06/13/2013
  • Issued: 03/29/2016
  • Est. Priority Date: 01/05/2007
  • Status: Active Grant
First Claim
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1. A portable electronic device comprising:

  • a jack constructed to receive a plug having a single prong and a plurality of signal conducting regions, wherein the jack includes a plurality of connectors which correspond at least to the plurality of signal conducting regions of the plug;

    a plug detection circuit electrically coupled to the jack, the plug detection circuit to detect receipt of the plug, and to provide a headset detect signal; and

    processing logic electrically coupled to the plug detection circuit, the processing logic to cause a bias power to be supplied to a transistor, the transistor to provide a microphone signal, the processing logic further to determine whether a microphone is coupled to one of the plurality of signal conducting regions of the plug by processing the headset detect signal and the microphone signal received from the transistor, wherein a microphone connector of the jack is to electrically couple the transistor to ground when a plug received at the jack does not have a microphone coupled to one of the plurality of signal conducting regions.

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