NFC READER HAVING A PASSIVE OPERATING MODE WITH LOW ELECTRICAL CONSUMPTION
First Claim
1. An inductive coupling reader, comprising:
- a passive interface circuit to modulate an impedance of an antenna circuit and to extract from the antenna circuit a data signal and a RF clock signal;
means for coupling the reader to a removable security module;
an emulation circuit to open a RF transmission channel with another reader, to transfer to the removable security module application data received through the RF transmission channel, and to send in the RF transmission channel application data received from the removable security module;
a non-removable electrical link to link the emulation circuit to the passive interface circuit, by which the data signal and the RF clock signal are supplied to the emulation circuit; and
a data bus clocked by a bus clock signal, having a frequency inferior to a frequency of the RF clock signal, to link the emulation circuit to the removable security module.
1 Assignment
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Accused Products
Abstract
An inductive coupling reader includes a passive interface circuit for modulating the impedance of an antenna circuit and extracting from the antenna circuit a data signal and a RF clock signal, and circuitry for coupling the reader to a removable security module. The reader includes an emulation circuit for opening a RF transmission channel with another reader, a non-removable electrical link linking the emulation circuit to the passive interface circuit, by which the data signal and the RF clock signal are supplied to the emulation circuit, and a data bus clocked by a bus clock signal having a frequency inferior to the frequency of the RF clock signal, for linking the emulation circuit to the removable security module. The reader has low electrical consumption.
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Citations
37 Claims
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1. An inductive coupling reader, comprising:
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a passive interface circuit to modulate an impedance of an antenna circuit and to extract from the antenna circuit a data signal and a RF clock signal; means for coupling the reader to a removable security module; an emulation circuit to open a RF transmission channel with another reader, to transfer to the removable security module application data received through the RF transmission channel, and to send in the RF transmission channel application data received from the removable security module; a non-removable electrical link to link the emulation circuit to the passive interface circuit, by which the data signal and the RF clock signal are supplied to the emulation circuit; and a data bus clocked by a bus clock signal, having a frequency inferior to a frequency of the RF clock signal, to link the emulation circuit to the removable security module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for implementing a passive operating mode in an inductive coupling reader having a passive interface circuit and a removable security module, the passive interface circuit being adapted to modulate an impedance of an antenna circuit and to extract from the antenna circuit a data signal and a RF clock signal, the removable security module being adapted to manage a secure application, the method comprising:
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providing an emulation circuit distinct from the removable security module and coupling the emulation circuit to the passive interface circuit through a non-removable electrical link by which the data signal and the RF clock signal are supplied to the emulation circuit; opening a RF transmission channel using the emulation circuit, transferring to the removable security module application data received by the emulation circuit through the RF transmission channel, and sending in the RF transmission channel application data received from the removable security module by the emulation circuit; and linking the emulation circuit to the removable security module using a data bus clocked by a bus clock signal having a frequency inferior to a frequency of the RF clock signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An inductive coupling reader formed as an integrated circuit on a semi-conductor chip, the reader comprising:
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a first port to couple the integrated circuit to an antenna circuit and a second port to couple the integrated circuit to a removable security module; a passive interface circuit to modulate an impedance of an antenna circuit and to extract from the antenna circuit a data signal and a RF clock signal; an emulation circuit to open a RF transmission channel with another reader, then to transfer to the second port application data received through the RF transmission channel, and to send in the RF transmission channel application data received via the second port; and a non-removable electrical link to link the emulation circuit to the passive interface circuit, by which the data signal and the RF clock signal are supplied to the emulation circuit. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An apparatus, comprising:
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an antenna circuit; a passive interface circuit coupled to said antenna circuit, and adapted to modulate an impedance of said antenna circuit and to extract from the antenna circuit a data signal and a RF clock signal; an emulation circuit coupled to the passive interface circuit to receive the data signal and the RF clock signal from the passive interface circuit, the emulation circuit being adapted to open a RF channel through which to carry application data; and a data bus coupled to the emulation circuit and clocked by a bus clock signal having a frequency inferior to a frequency of the RF clock signal. - View Dependent Claims (34, 35, 36, 37)
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Specification