发明申请
- 专利标题： TOUCH PAD CAPACITIVE SENSOR CIRCUIT
- 专利标题（中）： 触摸屏电容传感器电路
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申请号： US13604646申请日： 2012-09-06
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公开(公告)号： US20130120053A1公开(公告)日： 2013-05-16
- 发明人: Wangsheng MEI , Yan Huang , Wei Luo , Yang Wang , Jun Zhang
- 申请人： Wangsheng MEI , Yan Huang , Wei Luo , Yang Wang , Jun Zhang
- 申请人地址： US TX Austin
- 专利权人： FREESCALE SEMICONDUCTOR, INC.
- 当前专利权人： FREESCALE SEMICONDUCTOR, INC.
- 当前专利权人地址： US TX Austin
- 优先权： CN201110461367.X 20111116
- 主分类号： H03K17/96
- IPC分类号： H03K17/96
摘要：
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.
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