Patent ID: 7924156
Filing Date: 2011-04-12
Classification: G06K

Abstract:
1. A RFID tag comprising: an antenna configured to receive data in a first RF signal, to receive energy from the first RF signal, and to transmit data in a second RF signal, the transmission of the second RF signal being powered by the energy received from the first RF signal; and integrated circuitry including a state memory configured to store an ON/OFF state including two or more ON states of the RFID tag; a key memory configured for storing a key for changing the ON/OFF state stored in the state memory, and a switch logic configured to receive data from the input, to read the key from the key memory, to compare the received data with the read key, and to change the ON/OFF state stored in the state memory responsive to this comparison, the switch logic being further configured to determine whether or not to provide the second RF signal to the antenna for transmission, the determination being responsive to the ON/OFF state stored in the state memory.