| 摘要 |
A photoelectric conversion integrated circuit device for converting a light signal into a voltage signal has a photodiode that outputs a current in accordance with a light signal it receives, a current-to-voltage conversion circuit that outputs a voltage signal in accordance with a current signal it receives, and a test circuit that outputs a current and whose on/off state is controllable from the outside. At the output of the photodiode, two output terminals are provided, of which one is connected to the current-to-voltage conversion circuit and the other to the test circuit. This photoelectric conversion integrated circuit device allows a fault in the wiring between the photodiode and the current-to-voltage conversion circuit to be detected by feeding an input current to the current-to-voltage conversion circuit without shining light on the photodiode.
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