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CAPACITANCE MEASURING CIRCUIT FOR TOUCH SENSOR

  • US 20110187389A1
  • Filed: 09/10/2008
  • Published: 08/04/2011
  • Est. Priority Date: 09/19/2007
  • Status: Abandoned Application
First Claim
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1. A capacitance measuring circuit for a touch sensor, comprising:

  • a reference voltage generation unit for generating a first reference voltage and a second reference voltage;

    a MUX unit for selecting one from among electrode voltages input through a plurality of electrodes;

    a voltage comparator for comparing a voltage generated by the reference voltage generation unit with the electrode voltage input from an electrode;

    a charging/discharging circuit unit for performing charging of the input electrode voltage from the first reference voltage to the second reference voltage or performing discharging of the input electrode voltage from the second reference voltage to the first reference voltage;

    a timer unit for receiving an external control signal, measuring charging time and discharging time of the charging/discharging circuit unit, measuring entire charging time and entire discharging time, and outputting corresponding output signals; and

    a control unit for receiving an output signal of the voltage comparator and the external control signal and controlling the charging/discharging circuit unit and the timer unit.

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