| 摘要 |
PURPOSE: A device for eliminating an overvoltage of a microcomputer is provided to use only one zener diode, to eliminate each overvoltage applied to a plurality of monitor terminals of the microcomputer, so that the overvoltage in the monitor terminals are promptly eliminated. CONSTITUTION: Each diode(D1,D2) is connected to each monitor terminal of a microcomputer in a forward direction. The diodes are respectively formed two by two, therefore, four diodes are configured in total. The diodes are mutually connected in a backward direction with each other. Accordingly, signal interference is not generated between the diodes. A zener diode(ZD1) is commonly connected to the diodes, and bypasses an overvoltage applied to each monitor terminal of the microcomputer to a ground. An overvoltage is not applied to each monitor terminal of the microcomputer corresponding to test signals(V2-V5). As such, only one diode is used to eliminate an overvoltage applied to the monitor terminals of the microcomputer.
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