A tire-information administration system includes a plurality of sensor modules installed in tires; at least one reception module configured to receive data from the sensor modules; and a central control module configured to command the reception module to acquire data from the sensor modules. Each of the above current cells includes the switching NMOSs, and the constant-current sources of the NMOSs. A length of time until the crossing time point at which a first analog signal and a second analog signal cross each other is counted based on a calibrated RC time constant. The urging member includes a temperature-sensitive material that expands at or above a prescribed temperature. If the called destage operation is not initiated, then the scanned entry is removed from the cache list.