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Capacitive sensor system with improved capacitance measuring sensitivity

  • US 7,256,589 B2
  • Filed: 04/25/2002
  • Issued: 08/14/2007
  • Est. Priority Date: 04/27/2001
  • Status: Expired due to Fees
First Claim
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1. A capacitance sensor device comprising:

  • a semiconductor integrated circuit;

    a sensor electrode array arranged in a two dimensional array of n rows and m columns;

    a shield electrode array arranged in a one dimensional array of n rows;

    a quantity of m charge pump circuits;

    a quantity of n switched level drivers with output levels of Vcc and 0, and when addressed, switching synchronous to the charge pump circuits, and with outputs connected to each of the n shield electrodes; and

    a quantity of m blocks of n switches that allows the connection of one of the n sensor electrodes along a column to a charge pump circuit.

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