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Contactless communication with authorization by human contact

  • US 8,718,552 B2
  • Filed: 12/09/2011
  • Issued: 05/06/2014
  • Est. Priority Date: 12/10/2010
  • Status: Expired due to Fees
First Claim
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1. A transponder comprising:

  • a resonant circuit that includes an antenna and a capacitor;

    a memory; and

    an intermediate circuit that includes a contact zone configured to be contacted by a portion of human body, the intermediate circuit being configured to switch from a first state, in which the intermediate circuit does not allow the memory to be accessed, to a second state in which the intermediate circuit allows the memory to be accessed when the resonant circuit of the transponder is contactlessly powered by a reader, the intermediate circuit including;

    an intermediate terminal coupled to the contact zone and configured such that the positioning of the portion of human body on the contact zone changes a voltage of the intermediate terminal; and

    a flip-flop coupled to the intermediate terminal and configured to switch an output value in response to the portion of human body contacting the contact zone.

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