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    Method of reading a capacitive sensor and related integrated circuit
    1.
    发明公开
    Method of reading a capacitive sensor and related integrated circuit 审中-公开
    Ableseverfahrenfürkapazitiven Geber und integrierte Schaltung

    公开(公告)号：EP1219934A1

    公开(公告)日：2002-07-03

    申请号：EP00830780.3

    申请日：2000-11-28

    Applicant: STMicroelectronics S.r.l.

    Inventor： Sergio, Maximilian ,  Manaresi, Nicolò ,  Tartagni, Marco ,  Canegallo, Roberto

    IPC: G01D5/24

    CPC classification number: G01D5/24

    Abstract: A method for reading a capacitive sensor ( Fig. 1 ), constituted by an array of capacitors (C PIX_JK ) ordered in rows and columns functionally connected through row lines (R J ), each one electrically constituting a first plate in common to all the capacitors of a row, and through column lines (C K ), each one electrically constituting a second plate in common to all the capacitors of a column, the two sets of plates being orthogonal or quasi-orthogonal to each other, is provided.
    The method may be implemented by a circuit for biasing and reading capacitances that includes circuits for selecting a column line and a row line, a charge amplifier producing an output voltage representing the capacitance of the selected capacitor intercepted by the selected column and row lines, and comprises the steps of preliminarily resetting the output voltage of the charge amplifier, connecting to a reference voltage all the deselected row and column plates of the array and connecting an auxiliary capacitor and the selected capacitor to an inverting input of the amplifier and as feedback capacitor of said amplifier, respectively, or viceversa, applying a step voltage on the capacitor that is connected to the inverting input of the amplifier and reading at steady-state, the output voltage.
    An integrated reading system ( Fig. 2 ) for a capacitive sensor is also provided.

    Abstract translation: 一种读取电容式传感器（图1）的方法，由电容器阵列（CPIX_JK）构成，该电容器阵列以行和列排列，该行和列通过行线（RJ）功能连接，每个电容传感器电气地构成与所有电容器 一列，并且通过列线（CK），每个电子构成与列的所有电容器共同的第二板，两组板彼此正交或准正交。 该方法可以由用于偏置和读取电容的电路来实现，电容包括用于选择列线和行线的电路，产生表示由所选列和行线截取的所选电容器的电容的输出电压的电荷放大器，以及 包括以下步骤：预先重置电荷放大器的输出电压，连接到阵列的所有未选择的列和列板的参考电压，并将辅助电容器和所选择的电容器连接到放大器的反相输入端，并作为反馈电容器 分别表示放大器，或反之，对连接到放大器的反相输入端的电容器施加一个阶跃电压，并在稳态下读出输出电压。 还提供了用于电容式传感器的集成阅读系统（图2）。

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