Patent ID: 8653944

Claim:
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.