18830266. NFC ACCESSORY DETECTION WITHOUT MAGNETOMETER (STMicroelectronics International N.V.)
NFC ACCESSORY DETECTION WITHOUT MAGNETOMETER
Organization Name
STMicroelectronics International N.V.
Inventor(s)
Alexandre Tramoni of Le Beausset FR
NFC ACCESSORY DETECTION WITHOUT MAGNETOMETER
This abstract first appeared for US patent application 18830266 titled 'NFC ACCESSORY DETECTION WITHOUT MAGNETOMETER
Original Abstract Submitted
The present description relates to a mobile device comprising a near-field communication router and an antenna, coupled to the router via at least one impedance matching circuit between at least two impedance values. A first impedance value is selected to communicate with a near-field communication device of a first type in the presence of a near-field communication device of a second type, and a second impedance value is selected to communicate with a near-field communication device of the first type in the absence of a near-field communication device of the second type. The presence or the absence of a near-field communication device of the second type is determined based on polling frames transmitted by the antenna.