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你好,
可以参考以下连接,采用ISOW78系列的集成电源的数字隔离器,在隔离的同时可以省下一路隔离电源,减小了PCB面积,同时节省成本。
http://www.ti.com/tool/tida-01230?keyMatch=isolate%20rs232&tisearch=Search-EN-Everything