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ACCELERATION SENSOR MODULE WITH ATTITUDE DETERMINING FUNCTION

  • US 20120137776A1
  • Filed: 08/18/2010
  • Published: 06/07/2012
  • Est. Priority Date: 08/18/2009
  • Status: Active Grant
First Claim
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1. An acceleration sensor module with an attitude determining function, comprising:

  • a three-axis acceleration sensor configured to detect accelerations in X-axis, Y-axis, and Z-axis directions that are perpendicular to each other;

    an X-axis acceleration level determining section configured to determine whether an X-axis acceleration signal output from the three-axis acceleration sensor has a value equal to or more than a predetermined positive threshold level, a value equal to or less than a predetermined negative threshold level, a value between the positive threshold level and a level of 0, or a value between the level of 0 and the negative threshold level;

    a Y-axis acceleration level determining section configured to determine whether a Y-axis acceleration signal output from the three-axis acceleration sensor has a value equal to or more than a predetermined positive threshold level, a value equal to or less than a predetermined negative threshold level, a value between the positive threshold level and a level of 0, or a value between the level of 0 and the negative threshold level; and

    an attitude determining section configured to determine a rotated attitude of a device equipped with the acceleration sensor with respect to the Z axis based on results of determinations made by the X-axis acceleration level determining section and the Y-axis acceleration level determining section, wherein;

    the three-axis acceleration sensor, the X-axis acceleration level determining section, the Y-axis acceleration level determining section, and the attitude determining section are formed as a single unit;

    the X-axis acceleration level determining section and the Y-axis acceleration level determining section each output the determination result as a 2-bit value, and the attitude determining section outputs the determined attitude as a 2-bit value; and

    the attitude determining section determines a current attitude based on a combination of the 2-bit value indicating the preceding determined attitude, the 2-bit value output from the X-axis acceleration level determining section, and the 2-bit value output from the Y-axis acceleration level determining section.

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