Capacitive sensor device with drift compensation

A capacitive sensor device comprising a capacitance-measuring circuit, a main sense input and a reference sense input, wherein the capacitive sensor device is configured to measure, using the capacitance-measuring circuit, a current main value of capacitance seen by the main sense input and a current reference value of capacitance seen by the reference sense input, wherein the capacitive sensor device is configured to at least temporarily store at least one previously measured reference value, and wherein the capacitive sensor device is configured to use

• the current main value,
• the current reference value and the at least one previously measured reference value, and
• at least one current correction coefficient, with the capacitive sensor device being configured to adaptively determine the at least one current correction coefficient based on at least the current reference value and the at least one previously measured reference value,
• for determining a corrected current main value of capacitance
• wherein the main sense input is coupled with a capacitive sense electrode whose self-capacitance changes at an approach of a conductive body, and
• wherein the reference sense input is coupled with a capacitive reference electrode, the capacitive reference electrode being a discrete reference capacitor arranged to measure a capacitance that is sensitive to environment drift.