| 摘要 |
PURPOSE:To prevent any skipped reading of I/O) loads of a master unit and a local unit for automotive multiple harness system, in the power supply of the master unit, by feeding electric power from the second power supply in the master unit if a battery to the master unit is disconnected or shut down instantaneously. CONSTITUTION:The power supply fed from a battery enters a voltage regulator 4 through a surge absorption circuit 3, and is connected to a microcomputer 7 and I/Os 8, 9. There is also provided a communication circuit 10 which carries out multiple communication with local units 11, 12. Moreover, the second power supply 15 is formed in parallel between the surge absorption circuit 3 and the voltage regulator 4. |
