RFID tag, RFID reader/writer, RFID system, and processing method of RFID system

An RFID tag comprising circuits integrated on one semiconductor chip, said circuits including:

• a communication circuit having a modulation function and a demodulation function and performing wireless communication with an RFID reader/writer;
• a sensor circuit capable of performing various measurements;
• a control circuit which controls said communication circuit and said sensor circuit;
• and
• a power supply circuit which supplies power to said communication circuit, said sensor circuit, and said control circuit,
• wherein said power supply circuit includes a power cutoff circuit which controls cutoff/resumption of power supply to said communication circuit, said sensor circuit, and said control circuit.

A processing method of an RFID system which includes RFID tags each having a communication circuit, a control circuit, and a sensor circuit integrated on one semiconductor chip, and an RFID reader/writer which generates a carrier signal to said RFID tags and is capable of wireless communication with said RFID tags, wherein measurements including a first measurement and a second measurement are performed several times by using said sensor circuit, said method comprising:

• a first step of generating an instruction for performing said first measurement from said RFID reader/writer to said RFID tags;
• a second step of performing said first measurement by said RFID tags;
• a third step of stopping generation of said carrier signal from said RFID reader/writer to said RFID tags after an end of said first measurement;
• a fourth step of resuming generation of said carrier signal from said RFID reader/writer to said RFID tags after a predetermined period elapses;
• a fifth step of generating an instruction for performing said second measurement from said RFID reader/writer to said RFID tags;
• and
• a sixth step of performing said second measurement by said RFID tags.