Apparatus for identifying accessories connected to radiotelephone equipment

  • US 5,783,926 A
  • Filed: 11/05/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 11/05/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for identifying an accessory device connected to an electronic device from among a plurality of accessory devices, the apparatus comprising:

  • a constant current source for supplying a constant current;

    a resistor of resistance distinct to each particular accessory in the plurality of accessory devices, the resistor having a first lead electrically connected to the constant current source, and the resistor further having a second lead electrically connected to electrical ground;

    an analog to digital converter having an analog input electrically connected to the first lead of the resistor, the analog to digital converter for measuring the voltage level across the resistor, and the analog to digital converter further for creating a digital representation of the measured voltage level and communicating the digital representation of the measured voltage level to the electronic device; and

    a database accessible by the electronic device for associating the digital representation of the measured voltage level with the identity of the accessory device connected to the electronic device.

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