| 摘要 |
PURPOSE:To reduce power consumption by operating the only wake-up frame detection circuit when each slave transmitter is waited and operating the entire circuit when a wake-up frame is detected. CONSTITUTION:When a slave transmitter 5n is turned on, a sleep stand-by mode is selected. The first-step amplifier of an O/E converter 8 and a wake-up detection circuit 13 start operating. When the wake-up frame is detected by the photo diode of the first-step amplifier, each circuit is actuated in the prescribed timing, and a timer 14 is operated. Immediately after the prescribed count-up of the timer 14, it is returned to a sleep stand-by mode. Thus, the power consumption can be reduced. Moreover, by delaying the timing from a waiting state to an operational state in the order of slave number, unnecessary waiting time can be reduced. |
