Integrated automatic compass for vehicle

  • US 8,777,431 B2
  • Filed: 12/16/2013
  • Issued: 07/15/2014
  • Est. Priority Date: 06/06/2002
  • Status: Active Grant
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First Claim
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1. An integrated automotive compass suitable for use in a vehicle, said integrated automotive compass comprising:

  • an application specific integrated circuit;

    said application specific integrated circuit comprising at least first and second magnetoresponsive sensing elements;

    wherein said first and second magnetoresponsive sensing elements and at least a portion of associated circuitry are established on a common semiconductor substrate using CMOS technology;

    wherein said associated circuitry comprises at least one of (i) an A/D converter, (ii) a D/A converter, (iii) signal processing circuitry, (iv) memory, (v) signal filtering circuitry, (vi) a display driver, (vii) a LIN bus interface and (viii) a CAN bus interface;

    wherein said application specific integrated circuit occupies a less than about two square centimeter area;

    wherein, when powered via a vehicle power source, said application specific integrated circuit, at least in part, generates a compass directional heading of a vehicle equipped with said application specific integrated circuit;

    wherein said directional heading of the equipped vehicle is determined, at least in part, responsive to a sensing of a magnetic field by said magnetoresponsive sensing elements; and

    wherein automatic compensation for a deviating magnetic field during operation of the equipped vehicle is achieved, at least in part, via an algorithm processed by a processor of said application specific integrated circuit.

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