Capacitive touch detection device with self-calibration function

The invention discloses a capacitive touch detection device. The capacitive touch detection device comprises a sampling circuit and a detection and calibration circuit, the sampling circuit executes the following steps of: when a clock signal is at a first level, charging a capacitor, wherein the capacitance value of the capacitor is a first capacitance value when a touch event exists, the capacitance value of the capacitor is a second capacitance value when the touch event does not exist, the first capacitance value is greater than the second capacitance value, the first capacitance value isrelated to a self-capacitance and a touch capacitance, and the second capacitance value is irrelevant to the touch capacitance; sampling a capacitor voltage determined by the capacitor during a leveltransition period of the clock signal to generate a sampling value; and discharging the capacitor when the clock signal is at a second level. The detection and calibration circuit determines whether atouch condition is satisfi