Abstract: A controller controls a plurality of sensor electrodes. To a plurality of sense pins, the plurality of sensor electrodes are connected. A plurality of capacitance detection circuits respectively measure capacitance values of the corresponding sense pins. A calibration circuit calibrates the plurality of capacitance detection circuits. A relative relationship among the respective capacitance values of the plurality of sense pins is used for abnormality detection.

Abstract: A liquid container for accommodating a liquid includes: a plurality of detection electrodes mounted on the liquid container and connected to a detection circuit installed outside the liquid container, wherein the plurality of detection electrodes detects a tilt of the liquid container.

Abstract: A controller controls a plurality of sensor electrodes. To a plurality of sense pins, the plurality of sensor electrodes are connected. A plurality of capacitance detection circuits respectively measure capacitance values of the corresponding sense pins. A calibration circuit calibrates the plurality of capacitance detection circuits. A relative relationship among the respective capacitance values of the plurality of sense pins is used for abnormality detection.

Abstract: A liquid container for accommodating a liquid includes: a plurality of detection electrodes mounted on the liquid container and connected to a detection circuit installed outside the liquid container, wherein the plurality of detection electrodes detects a tilt of the liquid container.

Abstract: A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.

Abstract: A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.

Abstract: A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.

Abstract: A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.