| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic measuring circuit substantially shortening measuring time more than a conventional one. SOLUTION: An X-axis sensor 1 outputs signals corresponding to the intensity of geomagnetism in the direction of an X axis to an A/D converter 5 via an amplifier 4. The A/D converter 5 sequentially generates a voltage, which monotonously increases at a prescribed step width, at clock timing, and outputs signals to a control circuit 6 when the voltage reaches a voltage corresponding to output of the amplifier 4 or higher. The clock circuit 6 counts clocks, receives the signals from the A/D converter 5, and takes count values as first data. The A/D converter 5 sequentially generates a voltage, which monotonously increases at a prescribed step width, at clock timing and outputs signals again when the voltage reaches a voltage corresponding to output of the amplifier 4 or higher. The clock circuit 6 counts clocks, receives the signals, and takes count values as second data. The first data and the second data are outputted to a CPU 8. COPYRIGHT: (C)2006,JPO&NCIPI
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