| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic control device that can detect disconnection of wiring connecting two circuits.SOLUTION: The electronic control device has a first circuit 10 and a second circuit 50 electrically connected to each other through control wiring 90. The first circuit has a first terminal 12, an output buffer 14, an input buffer 15 and a voltage fixing part 16, where the output buffer is connected to the first terminal through output wiring 17 and the first terminal is electrically connected to the input buffer through input wiring 18. The voltage fixing part has first resistance 19 and a first switch 21 connected in series from first power supply toward input wiring. The second circuit has a second terminal 52 and pull-down resistance 58, where the first terminal is electrically connected to the second terminal through controlled wiring. When detecting disconnection of the controlled wiring, the first switch is turned on so that the controlled wiring is connected to the first power supply and the ground, and output of the output buffer is brought into a high impedance state.SELECTED DRAWING: Figure 2 |
