The interface circuit composed of optocoupler

Published:2012/9/28 22:28:00 Author:Ecco | Keyword: interface , optocoupler | From:SeekIC

As shown in figure, the optocoupler 4N25 in circuit plays the role of the the coupled pulse signal and isolation microcontroller 89C51 system and output section, so that the current of two parts is independent from each other. Output portion of the ground wire is connected to the chassis or earth, while the 89C51 system power ground wire is floating, and it is not connected to the ground wire of AC power to avoid the effect from power changes of output on microcontroller power, so it reduces interference the system suffered and increase system reliability.



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