Charging calibration system and method thereof

A charging calibration system of a touch pad, comprising:

• a plurality of operation touch pads, having a first capacitance value;
• a reference touch pad, having a second capacitance value greater than the first capacitance value;
• a power supply module, electrically coupled with the plurality of operation touch pads and the reference touch pad;
• in a reference measurement mode, applying a reference supply duty including a reference supply stage and a reference supply-terminated stage to repeatedly energize the reference touch pad so as to charge from an initial voltage value to a set voltage value in the reference supply stage, and then further to discharge from the set voltage value back to the initial voltage value in the reference supply-terminated stage;
• in a calibration mode, applying a calibration supply duty including a calibration supply stage and a calibration supply-terminated stage to repeatedly energize one of the operation touch pads so as to charge the instant operation touch pad from the initial voltage value to the set voltage value in the calibration supply stage, and then further to discharge from the set voltage value back to the initial voltage value in the calibration supply-terminated stage;
• and
• a statistics module, electrically coupled with the power supply module, having a reference charging number;
• in a reference measurement mode, when an accumulated number of the reference supply duty reaches the reference charging number, computing the reference charging time;
• wherein, the reference supply duty is greater than the calibration supply duty, and, in the calibration mode, the statistics module counts a number of the experienced calibration supply duty within the reference charging time so as to have the counted number as the reference charged number for the instant operation touch pad in the reference charging time.