Capacitance measurement device and electronic device thereof

A capacitance measurement device for measuring the capacitance of a measured capacitor, comprising:

• a first charging/discharging control unit for charging/discharging the measured capacitor;
• a second charging/discharging control unit for charging/discharging the measured capacitor;
• a first switch, coupled between the first charging/discharging control unit and the measured capacitor;
• a second switch, coupled between the second charging/discharging control unit and the measured capacitor;
• a first comparator, having two first inputs respectively coupled to the measured capacitor and a first reference voltage, and a first output outputting a first output signal corresponding to the capacitance of a measured capacitor;
• and
• a second comparator, having two second inputs respectively coupled to the measured capacitor and a second reference voltage, and a second output outputting a second output signal, wherein at least one of the first charging/discharging control unit and the second charging/discharging control unit further adjusts a charging/discharging capacities according to the second output signal.

An electronic device, comprising:

• a capacitance measurement device configured to measure a capacitance of a measured capacitor, the capacitance measurement device comprising:
• a plurality of charging/discharging control units, configured to charging/discharging the capacitor according to a predetermined sequence;
• and
• a duty cycle detecting circuit, configured to detect a duty cycle of a voltage signal on the measured capacitor to generate a value that represents the capacitance of the measured capacitor;
• and
• a processing unit, configured to receive the value that represents the capacitance of the measured capacitor and adjust at least one of a charging/discharging capacity used by at least one of charging/discharging control units.