RFID device and methods for controlling power supply according to connection with host and operation mode
First Claim
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1. A radio frequency identification (RFID) device comprising:
- an RFID connector configured to be connected with a host connector for data interface;
a radio frequency (RF) transceiver configured to perform wireless data communication with a tag;
a microprocessor configured to perform data communication with a host via the RFID connector and receive tag information from the tag via the RF transceiver;
a battery configured to supply a predetermined battery voltage; and
a voltage supply controller configured to control supply of the predetermined battery voltage to the microprocessor and the RF transceiver based on connection or disconnection between the RFID connector and the host connector,wherein the voltage supply controller provides the predetermined battery voltage to the microprocessor and the RF transceiver when the RFID connector is connected with the host connector, andwherein the radio frequency (RF) transceiver performs wireless data communication only when the predetermined battery voltage is supplied from the voltage supply controller,wherein when the RFID connector is disconnected from the host connector, the predetermined interface pin has high impedance and the switch circuit operates to interrupt the predetermined battery voltage supplied to the capacitor based on the high impedance of the predetermined interface pin.
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Abstract
A radio frequency identification (RFID) device and method for controlling power supply are provided. The RFID device controls power supply to its elements based on its connection with a host and its operation mode, thereby reducing power consumption.
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Citations
16 Claims
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1. A radio frequency identification (RFID) device comprising:
- an RFID connector configured to be connected with a host connector for data interface;
a radio frequency (RF) transceiver configured to perform wireless data communication with a tag; a microprocessor configured to perform data communication with a host via the RFID connector and receive tag information from the tag via the RF transceiver; a battery configured to supply a predetermined battery voltage; and
a voltage supply controller configured to control supply of the predetermined battery voltage to the microprocessor and the RF transceiver based on connection or disconnection between the RFID connector and the host connector,wherein the voltage supply controller provides the predetermined battery voltage to the microprocessor and the RF transceiver when the RFID connector is connected with the host connector, and wherein the radio frequency (RF) transceiver performs wireless data communication only when the predetermined battery voltage is supplied from the voltage supply controller, wherein when the RFID connector is disconnected from the host connector, the predetermined interface pin has high impedance and the switch circuit operates to interrupt the predetermined battery voltage supplied to the capacitor based on the high impedance of the predetermined interface pin. - View Dependent Claims (2, 3, 4, 5)
- an RFID connector configured to be connected with a host connector for data interface;
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6. A radio frequency identification (RFID) device comprising:
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an RFID connector configured to be connected with a host connector for data interface; a radio frequency (RF) transceiver configured to perform wireless data communication with a tag; a microprocessor configured to perform data communication with a host via the RFID connector, receive tag information from the tag via the RF transceiver, and detect an operation mode based on a voltage level of a data receiving line of the RFID connector; a battery configured to supply a predetermined battery voltage; and a voltage supply controller configured to control supply of the predetermined battery voltage to the RF transceiver based on the operation mode, wherein the voltage supply controller provides the predetermined battery voltage to the microprocessor and the RF transceiver when the RFID connector is connected with the host connector. - View Dependent Claims (7, 8, 9)
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10. A method of controlling power supply of a radio frequency identification (RFID) device according to connection with a host, the method comprising:
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supplying a predetermined battery voltage; and
controlling supply of the predetermined battery voltage to a microprocessor and a radio frequency (RF) transceiver of the RFID device based on connection or disconnection between a RFID connector of the RFID device and a host connector of the host,wherein the predetermined battery voltage is provided to the microprocessor and the RF transceiver when the RFID connector is connected with the host connector, and wherein the radio frequency (RF) transceiver performs wireless data communication only when the predetermined batter,/voltage is supplied from the voltage supply controller, wherein the supplying the predetermined battery voltage to the microprocessor and/or the RF transceiver comprises supplying the predetermined battery voltage to the capacitor based on a control voltage supplied from the host via a predetermined interface in among a plurality of interface pins when the RFID connector is connected with the host connector. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification