Geomagnetic sensor and geomagnetic sensor correction method, temperature sensor and temperature sensor correction method, geomagnetism detection device
First Claim
1. A geomagnetic sensor comprising:
- a geomagnetism detection unit for detecting geomagnetism;
a fuse memory possessing a plurality of memory units, which enables a selective electrical cut-off or connection of each of said memory units, for storing prescribed data according to a state of the electrical cut-off or connection;
a correction data writing unit for inputting measurement values of said geomagnetism detection unit at a time of manufacture, for obtaining correction values that correct a temperature property of the measurement values of the geomagnetism detection unit based on said measurement values, and for writing said correction values into said fuse memory by conducting selective electrical cut-off or connection of each memory unit contained in said fuse memory according to said correction values;
a correction data reading unit for reading said correction values from said fuse memory at times of actual use after manufacture; and
a correction unit for inputting the measurement values of said geomagnetism detection unit at times of actual use, and for correcting the measurement values of said geomagnetism detection unit based on the correction values read by said correction data reading unit.
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Accused Products
Abstract
With regard to the geomagnetic sensor 1, the control logic circuit 11 conducts control of the geomagnetic sensor 1. When the geomagnetic sensor 1 is installed in a cell phone device, the control logic circuit 11 reads the measurement values pertaining to the ambient magnetic field from the geomagnetic sensor circuit 12, obtains the offset value from the pertinent measurement values, and stores it in the fuse memory 13. At times of measurement by the geomagnetic sensor 1, the control logic circuit 11 reads the offset value from the fuse memory 13, and corrects the measurement values of the geomagnetic sensor 12 using the pertinent value.
With regard to the temperature sensor 201, the control logic circuit 211 conducts control of the temperature sensor 201. During preparation of the temperature sensor 201, the control logic circuit 211 reads the result of measurement of the property pertaining to the ambient temperature from the temperature sensor circuit 212, obtains the initial value and correction value from the result, and stores the pertinent values in the fuse memory 213. At times of operation of the temperature sensor 201, the control logic circuit 211 reads the initial value and correction value from the fuse memory 213, and corrects the measurement values of the temperature sensor circuit 212 using the pertinent values.
The correction coefficients a11-a22 of the magnetic sensors are measured during LSI shipment inspection. The correction data D1-D4 obtained from these correction coefficients a11-a22 are written into the fuse memory 315. The control circuit 308 inputs the detection outputs Sx and Sy of the magnetic sensors 310 and 311 to the internal register during geomagnetism detection. The correction data D1-D4 is read from the fuse memory 315. Detection outputs Sx and Sy are corrected using formulas (309) to (312).
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Citations
22 Claims
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1. A geomagnetic sensor comprising:
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a geomagnetism detection unit for detecting geomagnetism;
a fuse memory possessing a plurality of memory units, which enables a selective electrical cut-off or connection of each of said memory units, for storing prescribed data according to a state of the electrical cut-off or connection;
a correction data writing unit for inputting measurement values of said geomagnetism detection unit at a time of manufacture, for obtaining correction values that correct a temperature property of the measurement values of the geomagnetism detection unit based on said measurement values, and for writing said correction values into said fuse memory by conducting selective electrical cut-off or connection of each memory unit contained in said fuse memory according to said correction values;
a correction data reading unit for reading said correction values from said fuse memory at times of actual use after manufacture; and
a correction unit for inputting the measurement values of said geomagnetism detection unit at times of actual use, and for correcting the measurement values of said geomagnetism detection unit based on the correction values read by said correction data reading unit. - View Dependent Claims (2, 3)
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4. A temperature sensor comprising:
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a temperature detection unit for detecting temperature;
a fuse memory possessing a plurality of memory units, which enables a selective electrical cut-off or connection of each of said memory units, for storing prescribed data according to a state of the electrical cut-off or connection;
a correction data writing unit for inputting measurement values of said temperature detection unit at a time of manufacture, for obtaining initial values that correct the measurement values of said temperature detection unit based on said measurement values, for obtaining correction values that correct a temperature property of said temperature detection unit based on said measurement values, and for writing said initial values and said correction values into said fuse memory by conducting selective electrical cut-off or connection of each memory unit contained in said fuse memory according to said initial values and said correction values;
a correction data reading unit for reading said initial values and correction values from said fuse memory at times of actual use after manufacture; and
a correction unit for inputting the measurement values of said temperature detection unit at times of actual use, and for correcting the measurement values of said temperature detection unit based on the initial values and correction values read by said correction data reading unit.
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5. A temperature sensor correction method for correcting measurement data in a temperature sensor comprising a temperature detection unit for detecting temperature, a control unit for processing measurement values of said temperature detection unit, and a fuse memory for enabling a selective electrical cut-off by a flow of electric current, and for storing correction data used in correction by said correction unit according to a state of the electrical cut-off, the temperature sensor correction method comprising:
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a step in which the measurement values of said temperature detection unit are inputted by said control unit at a time of manufacture, initial values that correct a variation in measurement values of said temperature detection unit are obtained based on said measurement values, correction values that correct a variation in sensitivity of said temperature detection unit are obtained based on said measurement values, and said initial values and said correction values are written into said fuse memory by conducting an electrical cut-off of said fuse memory according to said initial values and said correction values;
a step in which said initial values and correction values are read from said fuse memory by said control unit at times of actual use after manufacture; and
a step in which the measurement values of said temperature detection unit are inputted by said control unit at said times of actual use, and the measurement values of said temperature detection unit are corrected based on the initial values and correction values read by said correction data reading unit. - View Dependent Claims (6)
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- 7. A geomagnetism detection device comprising a geomagnetism detection element for detecting transverse axial components of geomagnetism and a nonvolatile memory element of a thermal metamorphic type for storing correction information of detection outputs of the pertinent geomagnetism detection element, wherein said correction information consists of axial sensitivity correction coefficients and interaxial correction coefficients as well as values expressed as ratios relative to an axial sensitivity correction coefficient of either axis.
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13. A geomagnetism detection device comprising:
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a geomagnetism detection element for detecting geomagnetism of each transverse axial component; and
a nonvolatile memory element of a thermal metamorphic type for storing one piece or a plurality of pieces of correction data for correcting said detected geomagnetism values, wherein each piece of said correction data is expressed as a value of a ratio of an axial sensitivity correction coefficient, or interaxial correction coefficient, or a differential value obtained by subtracting a preset standard value from an axial sensitivity correction coefficient relative to the axial sensitivity correction coefficient of either axis. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification