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前端Sensor通过UB913 UB914将信号传送回主机，当913为连接前端Sensor时，IIC信号一切正常，当将前端的sensor接入913的IIC端口后，IIC信号就不正常了，现象为SCL和SDA可以被拉低一定程度（大概拉低了0.2V/1.8V），前端sensor为模组，其自带电源，i2c接口有自己的上拉电阻，有自己的一些IIC设备，但地址都不冲突。请问有谁遇到过这样的问题呢？
