Scanning circuit for pressure responsive array

  • US 5,505,072 A
  • Filed: 11/15/1994
  • Issued: 04/09/1996
  • Est. Priority Date: 11/15/1994
  • Status: Expired due to Term
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First Claim
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1. A circuit for scanning an array of pressure responsive sensor points, each of said points being intersected by one of a plurality of first electrodes and one of a plurality of second electrodes, there being a pressure sensitive resistance between the electrodes intersecting at each of said points, the circuit comprising:

  • means for generating a test signal;

    a first multiplexer for selectively applying the test signal to each first electrode, the test signal flowing through the pressure sensitive resistance for sensor points intersected by said first electrode for which the resistance is in a lowered resistance state to the second electrode intersecting the point;

    an output circuit; and

    a second multiplexer for selectively passing test signals appearing on the second electrodes to the output circuit;

    said output circuit including a means for controlling the sensitivity of the circuit.

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