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使用IIC隔离芯片1540D遇到的问题

Other Parts Discussed in Thread: ISO1540

1侧接到Fpga处,2侧接到一个iic接口的芯片,现在遇到的问题如下:

1,两侧时钟SCL正常

2,1侧,即iic芯片输出侧,SDA数据正常;2侧SDA中,Ack电平不正常

 还请各位大神不吝指导!!!小弟感激不尽