Abnormality detector for electronic device

An abnormality detector for an electronic device comprising:

• an abnormality detection unit that outputs an abnormality position signal for identifying an abnormality position on the occurrence of an abnormality at the electronic device;
• an abnormal state latch unit that latches the abnormality position signal;
• and an abnormality notification unit that notifies the abnormality based on the latched abnormality position signal, wherein
• the abnormality detection unit comprises:
• an abnormality voltage signal generation circuit that converts abnormality signals indicating the occurrences of abnormalities at predetermined abnormality positions to voltages differing between the abnormality positions to generate abnormality voltage signals about corresponding ones of the abnormality positions;
• and
• a voltage monitor circuit that monitors the abnormality voltage signals generated by the abnormality voltage signal generation circuit, and outputs the abnormality position signal for identifying the abnormality position based on the voltages corresponding to the abnormality voltage signals,
• the abnormal state latch unit comprises:
• an abnormal state detection circuit that masks the abnormality position signal;
• a timer circuit that starts motion when the abnormality position signal indicates the occurrence of an abnormality based on the abnormality position signal, and completes the motion and outputs a reset signal after passage of a predetermined period;
• and
• a latch circuit that latches the abnormality position signal output from the abnormal state detection circuit when the reset signal is output,
• the abnormal state detection circuit masks the abnormality position signal when the latch circuit makes latching motion to disable an output from the abnormal state detection circuit,
• the timer circuit masks an input to the timer circuit when the latch circuit makes the latching motion to maintain a state indicating completion of the motion, and
• the abnormality voltage signals about corresponding ones of the abnormality positions generated by the abnormality voltage signal generation circuit are wired-OR connected and supplied through a single signal line to the voltage monitor circuit.