Electrostatic capacity type touch sensor

An electrostatic capacity type touch sensor comprising:

• a sensor circuit detecting a change in a capacitance of a touch pad;
• a calibration register to adjust an offset in an output value of the sensor circuit;
• and
• a control circuit configured to:
• control the sensor circuit to obtain a first output value of the electrostatic capacity type touch sensor based on first calibration data stored in the calibration register,
• modify the first calibration data depending on the first output value to obtain second calibration data,
• control the sensor circuit to obtain a second output value of the electrostatic capacity type touch sensor based on the second calibration data,
• after obtaining the second output value, control the sensor circuit to obtain a third output value of the electrostatic capacity type touch sensor based on the first calibration data, and
• judge whether an offset in the second output value is larger than an offset in the third output value when a difference between the first output value and the third output value is smaller than a first threshold value, the offset in the second output value being a difference between a reference value and the second output value, and the offset in the third output value being a difference between the reference value and the third output value.