Tuneable NFC-enabled device
First Claim
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1. A near field communications (NFC) device coupled to a host device, the NFC device comprising:
- a controller configured to;
receive a control signal sent by the host device in response to coupling a removable or replaceable attachment to the host device, anddetermine, in response to the control signal, an expected field strength based upon a configuration of the host device having the removable or replaceable attachment; and
a magnetic field sensor configured to sense a magnetic field strength and to provide a sensed field strength signal,wherein the controller is further configured to determine a difference between the sensed magnetic field strength and the expected field strength and to vary an operating parameter of the NFC device to change the difference in response to the sensed field strength signal.
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Abstract
An NFC-enabled device configured at least in part as an integrated circuit, the integrated circuit including a controller and a plurality of capacitors. The controller is operable to control one or more of the plurality of capacitors to vary an operating parameter of the NFC-enabled device.
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Citations
29 Claims
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1. A near field communications (NFC) device coupled to a host device, the NFC device comprising:
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a controller configured to; receive a control signal sent by the host device in response to coupling a removable or replaceable attachment to the host device, and determine, in response to the control signal, an expected field strength based upon a configuration of the host device having the removable or replaceable attachment; and a magnetic field sensor configured to sense a magnetic field strength and to provide a sensed field strength signal, wherein the controller is further configured to determine a difference between the sensed magnetic field strength and the expected field strength and to vary an operating parameter of the NFC device to change the difference in response to the sensed field strength signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communications device, comprising:
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a controller configured to; determine a mechanical variant of the communications device from among a plurality of mechanical variant types for the communications device, and determine an expected field strength based upon the determined mechanical variant; and a magnetic field sensor configured to sense a magnetic field strength and to provide a sensed field strength signal, wherein the controller is further configured to determine a difference between the sensed magnetic field strength and the expected field strength and to vary an operating parameter of the communications device to change the difference in response to the sensed field strength signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A near field communications (NFC) device coupled to a host device, comprising:
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a controller configured to; determine a variant type of the host device from among a plurality of variant types for the host device, and determine an expected field strength based upon the determined variant type; and a magnetic field sensor configured to sense a magnetic field strength of a received signal and to generate a sensed field strength signal, wherein the controller is further configured to determine a difference between the sensed magnetic field strength and the expected field strength and to vary an operating parameter of the NFC device to change the difference in response to an operating condition of the NFC device. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method for operating a near field communications (NFC) device coupled to a host device, comprising:
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coupling a removable or replaceable attachment to the host device; determining, by the NFC device, an expected field strength in response to the coupling; sensing, by the NFC device, a magnetic field strength of a received signal; generating, by the NFC device, a sensed field strength signal; determining, by the NFC device, a difference between the sensed magnetic field strength and the expected field strength; and varying, by the NFC device, an operating parameter of the NFC device to change the difference.
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Specification