| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a voltage measurement apparatus for maintaining a performance of analog sensors, and inhibiting the AD conversion accuracy from being degraded. Ž<P>SOLUTION: The voltage measurement apparatus includes: two or more analog sensors 11a-11d supplied with a high potential voltage V<SB>H</SB>as a power supply voltage V<SB>cc</SB>; a first AD converter 12 supplied with a low potential voltage V<SB>L</SB>as a reference voltage V<SB>ref</SB>lower than the high potential voltage V<SB>H</SB>, and converting a sensor output voltage V<SB>OUT</SB>output from at least one analog sensor 11c, 11d among two or more analog sensors 11a-11d; a second AD converter 13 supplied with the high potential voltage V<SB>H</SB>as the reference voltage V<SB>ref</SB>, and converting at least the low potential voltage V<SB>L</SB>; and a correction section 14 for correcting a digital data of the sensor output voltage V<SB>OUT</SB>converted by the first AD converter 12 based on a digital data of the low potential voltage V<SB>L</SB>converted by the second AD converter 13. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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