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我需要自制一款隔离型XDS110仿真器,在LAUNCHXL-F280049C的原理图上,USB信号通过数字隔离器隔离,但是USB的5V总线电压连接到了MCU上,导致事实上数字隔离器两侧需要共地连接。请问TI工程师如何才能实现USB侧与设备侧的完全隔离?