Patent ID: 7564340

Claim:
A contactless integrated circuit comprising: a radiofrequency identification (RFID) communication interface comprising an antenna coil that receives a first induced alternating voltage when the integrated circuit is in the presence of a radiofrequency magnetic field, an ultrahigh frequency (UHF) communication interface comprising a UHF antenna that receives a second induced alternating voltage when the contactless integrated circuit is in the presence of a UHF electric field signal, a data processing unit equipped with an electrically programmable and erasable memory, an interface multiplexer that couples the data processing unit to the RFID communication interface or the UHF communication interface, a communication mode detection circuit that delivers a mode signal, the value of which indicates which communication interface is active, a first modulation and demodulation circuit that sends and receives data via the antenna coil, a second modulation and demodulation circuit that sends and receives data via the UHF antenna, and multiplexer and demultiplexer circuits driven by the mode signal to link the data processing unit to one of the two modulation and demodulation circuits.