Near-field communication device and method
AssigneeSTMicroelectronics (Rousset) SAS
InventorAlexandre TRAMONI
Life of this patent
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Abstract
A method includes detecting, by a first near-field communication device, the presence of a second near-field communication device. In a case where the second device is intended to be charged in near-field by the first device, the method further includes adjusting, by a control device, an impedance of an impedance matching circuit forming part of a near-field communication circuit of the first device.
Claims20
A method, comprising:
- detecting, by a first near-field communication device, the presence of a second near-field communication device;
- in a case where the second device is configured to be charged in near-field by the first device, adjusting, by a control device, an impedance of an impedance matching circuit forming part of a near-field communication circuit of the first device;
- and
- in a case where the second device is intended to exchange data with the first device, and a same antenna is alternatively used for power exchange and communications, keeping an impedance of the impedance matching circuit unchanged.
A near-field communication circuit, configured to be integrated in a first near-field communication device capable of detecting the presence of a second near-field communication device, the near-field communication circuit comprising:
- an impedance matching circuit;
- and
- a control device, configured to:
- adjust an impedance of the impedance matching circuit in a case where the second device is configured to be charged in near field by the first device, and
- keep an impedance of the impedance matching circuit unchanged in a case where the second device is intended to exchange data with the first device, and a same antenna is alternatively used for power exchange and communications.
A near-field communication device, comprising:
- a near-field communication circuit configured to be integrated in a first near-field communication device capable of detecting the presence of a second near-field communication device, the near-field communication circuit comprising:
- an impedance matching circuit;
- and
- a control device, configured to:
- adjust an impedance of the impedance matching circuit in a case where the second device is configured to be charged in near field by the first device, and
- keep an impedance of the impedance matching circuit unchanged in a case where the second device is intended to exchange data with the first device, and a same antenna is alternatively used for power exchange and communications;
- and
- a near-field communication antenna, coupled to the near-field communication circuit.
Dependencies are inferred from the claim text.