Abstract: A CAN driver receives vehicle information sent onto CAN. A diagnosis information acquiring module monitors whether an operation of a diagnosis record ECU itself is normal or not and thus generates diagnosis information. A timestamp information generating module generates timestamp information A per sec and generates timestamp information B in which a time difference from the generation timing of the timestamp information A is expressed on the unit of 1/100 sec. A diagnosis record module, each time the timestamp information generating module generates the timestamp information A, transfers a first type record containing the timestamp information A and the diagnosis information generated at this point of time to a memory manager, and transfers a second type record containing the vehicle information and the timestamp information B generated at this point of time to the memory manager.

Abstract: At a sampling operation, an analog signal and an inverted signal thereof are respectively supplied to first and second sampling capacitor elements, DC components of input signals are supplied to first and second capacitors, and reference voltages are supplied to third and forth capacitors. At the time of the comparison operation, the reference voltages are respectively supplied to the first and the second sampling capacitor elements, the first and the third capacitors and the second and the forth capacitors are connected in parallel, respectively.