公开(公告)号：US20200174597A1

公开(公告)日：2020-06-04

申请号：US16675950

申请日：2019-11-06

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Abhishek SINGH ,  Hugo GICQUEL

IPC: G06F3/044 ,  H02M3/07

Abstract: Disclosed herein is a circuit including a driver circuit applying a received drive signal to a capacitive sensing line of a capacitive touch panel as a boosted drive signal, the driver circuit powered by a boosted supply voltage. A charge pump circuit receives an input supply voltage and output the boosted supply voltage, the charge pump circuit including a voltage sensing circuit to sense the boosted supply voltage and a comparison circuit to compare the sensed boosted supply voltage to a threshold and produce a comparison signal. A control circuit determines a ratio of a pulse width of the comparison signal to the drive signal, and tunes operation of the charge pump circuit to drive the ratio to match a performance threshold.

公开(公告)号：US20160146874A1

公开(公告)日：2016-05-26

申请号：US14550415

申请日：2014-11-21

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD

Inventor： Dianbo GUO ,  EngJye NG ,  Abhishek SINGH

IPC: G01R31/02 ,  G01R31/28

CPC classification number: G01R31/025 ,  G01R31/024 ,  G01R31/08 ,  G06F3/0418 ,  G06F3/044 ,  G06F2203/04111

Abstract: A microelectronic short circuit detection module is disclosed that locates and distinguishes among different types of short circuits in touch screen panels. Individual short circuit detection circuits are coupled to force and sense lines throughout a wire matrix within the touch screen. If the line is shorted to a neighboring line or any other line carrying an opposite logic state, its logic state will be corrupted by the short and will be held at a value opposite that of the intended input signal. Comparing the input and the output therefore provides an indicator of a short circuit to another force or sense line in the wire matrix. A pair of pull up/down stages is engaged to detect whether the short is coupled to power or ground. A threshold resistor can be varied to adjust detection sensitivity. By conducting a serial test, matrix coordinates of the short circuit can be identified.

Abstract translation: 公开了一种微电子短路检测模块，其定位和区分触摸屏面板中的不同类型的短路。 单独的短路检测电路被耦合以在触摸屏内的整个线矩阵中强制和感测线。 如果线路短路到相邻线路或承载相反逻辑状态的任何其他线路，其逻辑状态将被短路损坏，并将保持在与预期输入信号相反的值。 因此，输入和输出的比较提供了与线阵中的另一个力或感测线短路的指示符。 一对上拉/下降级被接合以检测短路是否耦合到电源或接地。 可以改变阈值电阻来调整检测灵敏度。 通过串行测试，可以识别短路的矩阵坐标。