| 摘要 |
PROBLEM TO BE SOLVED: To provide a disconnection detection circuit to detect the defective connection with a simple circuit configuration even when defective connection such as disconnection and connection detachment is generated in a power supply path to supply the power to a sensor for the quantity of state of a vehicle. SOLUTION: The power supply path to connect power I/O terminals 13 and 25 to each other to supply the power to the sensor 29 for the quantity of state of the vehicle comprises at least diodes D2 and D3 interposed in series in the power supply path, a transistor TR1 and a resistor R1 to be interposed in parallel to the diodes D2 and D3, and a resistor R2 to be interposed in parallel to the transistor TR1, and defective connection is detected based on the ON-OFF state signal output to be outputted from an output terminal 23 of the transistor TR1.
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