Passive type RFID semiconductor device, IC tag, and control method
First Claim
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, andwherein 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.
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Accused Products
Abstract
To provide a semiconductor device capable of securely executing a reading operation to improve a reliability of read data, an IC tag including the semiconductor device, and a control method for the IC tag. A semiconductor device according to an embodiment of the present invention includes: a power supply voltage generating circuit for generating a power supply voltage based on a received radio signal; a power supply voltage generating circuit for detecting the power supply voltage; a memory area for storing predetermined data; a reading/writing circuit using different operation voltages for reading data from the memory area and writing data to the memory area; and a control circuit for executing a data reading operation for the memory area based on a detected power supply voltage.
50 Citations
24 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A control method for an integrated circuit (IC) tag that communicates with a reader/writer by using a radio signal, the control method comprising:
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receiving a read command included in the radio signal from the reader/writer; generating a power supply voltage of at least a first voltage value, based on the radio signal; executing the read command to generate a read signal and transmission data, if a voltage level of the power supply voltage is at least the first voltage value; detecting whether the voltage level of the power supply voltage is less than a second voltage value; reading a predetermined data from a storage unit of the IC tag in response to the read signal, if the voltage level of the power supply voltage is at least the second voltage value; and outputting the transmission data, wherein the second voltage value is larger than the first voltage value, and wherein the transmission data is not outputted when the detected voltage level of the power supply voltage is at least the first voltage value but less than the second voltage value. - View Dependent Claims (20, 21, 22)
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23. A communication method for a communication between an integrated circuit (IC) tag and a reader/writer by using a radio signal, the communication method comprising:
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in the reader/writer, transmitting a read command included in the radio signal; and in the IC tag; receiving the read command included in the radio signal; generating a power supply voltage of at least a first voltage value, based on the received radio signal; executing the read command to generate a read signal and transmission data, if a voltage level of the power supply voltage is at least the first voltage value; detecting whether the voltage level of the power supply voltage is less than a second voltage value; reading a predetermined data from a storage unit of the IC tag in response to the read signal, if the voltage level of the power supply voltage is at least the second voltage value; and outputting the transmission data, wherein the second voltage value is larger than the first voltage value, and wherein the transmission data is not outputted when the detected voltage level of the power supply voltage is at least the first voltage value but less than the second voltage value. - View Dependent Claims (24)
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Specification