| abstract |
Individual information can be transmitted / received without confirmation of the battery's remaining capacity or battery replacement due to deterioration of the driving battery over time, and even when there is insufficient power from external radio waves or electromagnetic waves, A semiconductor device having an RFID capable of maintaining a state is provided. A battery (also called a secondary battery) is provided as a power source for supplying power to the RFID. And, when the power that can be obtained from the externally received signal is greater than the predetermined power, the surplus power is accumulated in the battery, and when the power that can be obtained from the externally received signal is smaller than the predetermined power, the battery Power that can be obtained from is used for driving power. |