RFID tags that backscatter more codes

  • US 8,390,431 B1
  • Filed: 03/18/2012
  • Issued: 03/05/2013
  • Est. Priority Date: 05/31/2007
  • Status: Active Grant
First Claim
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1. An Integrated Circuit (IC) for use with a Radio Frequency Identification (RFID) tag having an antenna, comprising:

  • a memory storing a first code; and

    a processing block coupled with the antenna and configured to;

    cause the first code to be backscattered if a first command is received;

    receive a challenge;

    determine a response to the challenge;

    receive a third command; and

    in response to receiving the third command, cause to be backscattered a combination made from at least portions of the first code and the response, without receiving any commands while the combination is being backscattered.

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