| 摘要 |
<p>PURPOSE:To automatically enable a power source to be applied again even when hit is generated at the time of starting up an engine, etc., by generating a Vcc output ON signal which applies the power source at a supply power source monitoring part in terminal equipment for on-vehicle system. CONSTITUTION:A supply source voltage monitoring part 1 outputs the Vcc output ON signal 5 when a supply voltage VA exceeds a regulated voltage value. For example, in the case of supplying the supply voltage VA based on the battery of an automobile, Vcc output 6 is turned off because the supply voltage goes to zero volt while the source voltage VA is cut off in a state where the power source of the terminal equipment is applied by depressing a Vcc output ON switch 2. Next, when the supply voltage VA exceeds the regulated voltage value on the middle way to recover to an original voltage, the supply source voltage monitoring part 1 outputs the Vcc output ON signal 5, and a power source control part 4 turns on the Vcc output 6 by the Vcc output ON signal 5, then, automatically turns off the power source of the terminal equipment.</p> |
