| 摘要 |
An analog section (4) including the selector for analog input terminals, ladder resistors, a decoder for decoding the output of the ladder resistors, a chopper amplifier, and a sample and hold circuit, is operated by 5 V power-supply system. A digital section (5) that generates a control signal for controlling the operation of the analog section 4 is operated by 3.3 V power-supply system. No design change of a sensor connected from outside a microcomputer is required.
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