Touch panel controller and electronic apparatus employing same

摘要

A touch panel controller (1), which can accurately detect changes in capacitance values of respective first and second electrostatic capacitors which are touched, includes: a driving section (4) for driving drive lines (DL1 through DL4) on the basis of a code sequence so as to drive (i) electrostatic capacitors (C31 through C34) provided between the respective drive lines (DL1 through DL4) and a sense line (SL3) and (ii) electrostatic capacitors (C41 through C44) provided between the respective drive lines (DL1 through DL4) and a sense line (SL4) so that (i) a first linear sum of first capacitance values of the respective electrostatic capacitors (C31 through C34) is outputted from the sense line (SL3) and (ii) a second linear sum of second capacitance values of the respective electrostatic capacitors (C41 through C44) is outputted from the sense line (SL4); a differential amplifier (5) for amplifying a difference between the first linear sum and the second linear sum; and a saturation prevention control section (8) for correcting a line dependency between the first capacitance values and the second capacitance values.