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Cell phone accessory identification algorithm by generating and measuring a voltage pulse through a pin interface

  • US 7,565,458 B2
  • Filed: 11/29/2004
  • Issued: 07/21/2009
  • Est. Priority Date: 12/12/2003
  • Status: Active Grant
First Claim
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1. Method for identifying a communication interface of an electronic unit attached to a connector of an electronic device, comprising the steps of:

  • generating a voltage pulse in said device on a pin of said connector;

    measuring the voltage response to the voltage pulse generated on said pin, as affected by a load in said unit;

    comparing the measured voltage response with predetermined voltage criteria; and

    performing communication interface identification of said unit dependent on said comparison.

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