CONTROL METHOD FOR AN NFC DEVICE
The present description concerns a method of controlling a first NFC device comprising an NFC controller coupled to an antenna, wherein a mode of charge of a second remote NFC device by the antenna is interrupted as a result of a detection, by the NFC controller, of an impedance change of the antenna, the interruption being followed by the starting of a communication, via the antenna, with a third remote NFC device.
1 . A method of controlling a first NFC device comprising an NFC controller coupled to an antenna, wherein the method comprises:
interrupting, by the NFC controller, a mode of charge of a second remote NFC device by the antenna as a result of a detection, by the NFC controller, of an impedance change of the antenna; and
starting, following the interrupting, a communication with a third remote NFC device via the antenna.
2 . The method of claim 1 , wherein the antenna comprises at least two windings in series.
3 . The method of claim 2 , wherein each of the at least two windings in series comprise a plurality of turns.
4 . The method of claim 3 , wherein a number of turns of a first winding of the at least two windings is from 6 to 8 turns.
5 . The method of claims 2 , wherein a first winding of the at least two windings in series defines a first surface and a second winding defines a second surface, wherein the first surface is at least twice as large as the second surface.
6 . The method of claim 2 , wherein a first winding of the least two windings is arranged within a second winding of the at least two windings.
7 . The method of claim 2 , wherein a first winding of the at least two windings is arranged outside of a second winding of the at least two windings.
8 . The method of claim 1 , wherein the antenna comprises two windings; a first winding of the two windings configured for NFC charging of the second NFC device and a second winding of the two windings configured for NFC detection and communication with the third NFC device.
9 . The method of claim 8 , wherein the antenna comprises a third winding in series with the first winding and the second winding, wherein the third winding is configured for NFC charging of a fourth NFC device.
10 . The method of claim 1 further comprising: implementing, as a result of the detection and by the NFC controller, a polling mode.
11 . The method of claim 1 further comprising: resuming, at an end of the communication, the mode of charge.
12 . A cell phone comprising a device configured to implement the method of claim 1 .
13 . A system comprising:
the cell phone of claim 12 ;
the second NFC device; and
the third NFC device.
14 . The system of claim 13 , wherein the second NFC device is a stylus.
15 . The system of claim 13 further comprising a fourth NFC device, wherein the second NFC device is configured to emit sounds and the fourth NFC device is configured to emit sounds.
16 . An NFC device comprising:
an NFC controller coupled to an antenna;
wherein the NFC controller is configured to:
interrupt a mode of charge of a second remote NFC device by the antenna as a result of a detection, by the NFC controller, of an impedance change of the antenna; and
start, following the interrupt, a communication with a third remote NFC device via the antenna.
17 . The NFC device of claim 16 , wherein the antenna comprises at least two windings in series.
18 . The NFC device of claim 17 , wherein each of the at least two windings in series comprise a plurality of turns.
19 . The NFC device of claim 18 , wherein a number of turns of a first winding of the at least two windings is from 6 to 8 turns.
20 . The NFC device of claim 17 , wherein a first winding of the at least two windings in series defines a first surface and a second winding defines a second surface, wherein the first surface is at least twice as large as the second surface.