Patent ID: 8125232

Claim:
A capacitive sensing device, comprising: n sensing electrodes, wherein n is an integer equal to or larger than two; a selection register storing a value for selecting m sensing electrodes from the n sensing electrodes, wherein m is an integer satisfying n≧m≧2; a selection section selecting the m sensing electrodes from the n sensing electrodes based on the value stored in the selection register; a charging and discharging control section coupled to the m sensing electrodes, wherein controlling charging and discharging capacitors connected to the m sensing electrodes is performed in parallel; a comparison section coupled to the m electrodes, wherein comparing a reference potential with a potential of each of the m sensing electrodes during the charging is performed by the charging and discharging control section, to generate comparison result signals associated with the m sensing electrodes; and a determination section coupled to the comparison section, wherein determining a difference between capacitance values of the capacitors coupled to the m sensing electrodes is based on the comparison result signals associated with the m sensing electrodes.