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    • 3. 发明申请
    • TOUCH PAD CAPACITIVE SENSOR CIRCUIT
    • 触摸屏电容传感器电路
    • US20130120053A1
    • 2013-05-16
    • US13604646
    • 2012-09-06
    • Wangsheng MEIYan HuangWei LuoYang WangJun Zhang
    • Wangsheng MEIYan HuangWei LuoYang WangJun Zhang
    • H03K17/96
    • G06F3/044G06F3/0418
    • A touch pad capacitive sensor circuit has a signal generator that generates an oscillation signal having an oscillation frequency variable dependent on a capacitance in the sensor circuit. A switch switches a touch pad capacitive sensor of a capacitive touch pad connected to the signal generator in first and second cycles of the switch. A counter counts a first count of cycles of the oscillation signal when the sensor is connected to the signal generator in a first cycle of operation of the switch and a second count of cycles of the oscillation signal when the sensor is connected to the signal generator in a second cycle of operation. A detector detects when the first and second counts are below a low threshold number. The sensor circuit flags a valid user touch depending on an output of the detector.
    • 触摸板电容传感器电路具有产生具有取决于传感器电路中的电容的振荡频率的振荡信号的信号发生器。 开关在开关的第一和第二周期中切换连接到信号发生器的电容式触摸板的触摸板电容传感器。 当传感器在开关的第一周期中连接到信号发生器时,计数器计数振荡信号的第一个周期数,以及当传感器连接到信号发生器时的振荡信号的周期的第二个计数 第二个操作周期。 检测器检测第一和第二计数何时低于低阈值数。 传感器电路根据检测器的输出标记有效的用户触摸。