Patent ID: 7806332
Filing Date: 2010-10-05
Classification: G06K

Abstract:
1. A passive type radio frequency identification (RFID) semiconductor device that communicates with a reader/writer by using a radio signal, the passive type RFID semiconductor device comprising: a power supply voltage generator that is responsive to a radio signal to generate a power supply voltage therefrom; a storage unit that stores predetermined data; a voltage detector that monitors a voltage level of the power supply voltage generated by the power supply voltage generator, a control unit that can execute a read command included in the radio signal to generate a read signal and transmission data, if the voltage level of the power supply voltage is at least a first voltage value; a memory access unit that is coupled to the storage unit and that can read the predetermined data from the storage unit in response to the read signal, if the voltage level of the power supply voltage is at least a second voltage value; and a transmitter that is coupled to the control unit and that outputs the transmission data, wherein the second voltage value is larger than the first voltage value, and wherein the transmitter does not output the transmission data when the voltage level of the power supply voltage monitored by the voltage detector is at least the first voltage value but less than the second voltage value.