Low-powered Radio Frequency Identification Tag and the method for long tag life

A low-power RFID(Radio Frequency IDentification) tag for lengthening a tag life and a method thereof are provided to lengthen life of a battery by operating only the minimum circuit for waking up the RFID tag, and perform operation with voltage of a continuous wave instead of voltage supplied from the internal battery when the voltage of the continuous wave received from an RFID tag reader is sufficient. A general command decoder(255) detects a general command by decoding a signal received from an RFID tag reader. A wake-up command decoder(245) detects a wake-up command by decoding the signal. A main controller(260) activates the general command decoder, and deactivates the general command decoder when the general command is not received from the general command decoder for a predetermined time in an active mode performing the general command. A wake-up controller(250) switches the main controller into the active mode when a voltage level of a continuous wave included in the signal is higher than a predetermined voltage level or the wake-up command is identical with an activation code while the main controller is kept in a standby mode.