Abnormality Detection Apparatus of Comparator

摘要

Abnormality of a comparator is to be detected while it is assembled in a control apparatus. An output OUT of a comparator 4 is connected to a first analog data input port 13 in addition to an input port 11 of a microcomputer 6. A pin P1 as a signal input terminal of the comparator is connected to a second output port 15 capable of outputting an H or L microcomputer signal MO of the microcomputer and also to a second analog data input port 14. An abnormality judgment portion 9 of the microcomputer can detect abnormality due to failure of the comparator itself and failure of the peripheral devices on the basis of the output of the comparator during a normal operation, the comparator output when the microcomputer signal is outputted, and the comparator outputs before and after the output and stop of the microcomputer signal.