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US 9,425,862 B2Granted
Anticollision mechanism for an NFC device
AssigneeSTMicroelectronics (Rousset) SAS
InventorsPierre Rizzo, Nathalie Vallespin, Emmanuel Papart
Life of this patent
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Abstract
An anticollision method for an NFC device wherein, in reader mode, a variation of a piece of information representative of the amplitude of the signal in an antenna of the device is monitored, and if this piece of information exceeds a threshold, the device is switched to the card mode.
Claims11
A method, comprising:
- in a reader mode of operation of a near-field communication (NFC) device, monitoring, by the NFC device, a variation of a piece of information representative of an amplitude of a signal in an antenna of the NFC device;
- and
- when the variation of the piece of information exceeds a threshold, switching, by the NFC device, from the reader mode of operation to a card mode of operation.
A device, comprising:
- near-field communication (NFC) control circuitry;
- and
- NFC transmission circuitry coupled to the NFC control circuitry, wherein the NFC control circuitry, in a reader mode of operation,
- monitors an indication of an amplitude of a signal in the NFC transmission circuitry;
- compares a variation in the indication of the amplitude to a threshold variation;
- and
- when the variation in the indication of the amplitude exceeds the threshold variation, switches from the reader mode of operation to a card mode of operation.
4 more elements
A system, comprising:
- one or more nodes, which, in operation, receive and output signals;
- and
- near-field communication (NFC) router circuitry coupled to the one or more nodes, wherein the NFC router circuitry, in a reader mode of operation:
- monitors an indication of an amplitude of a signal in the NFC transmission circuitry;
- compares a variation in the indication of the amplitude to a threshold variation;
- and
- when the variation in the indication of the amplitude exceeds the threshold variation, switches from the reader mode of operation to a card mode of operation.
4 more elements
Dependencies are inferred from the claim text.