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ISO1540 issue urgent

Other Parts Discussed in Thread: ISO1540

Hello,

                 Please refer to below waveform. why are SCLA1 and SCL two pins have 0.72 offset? The ground potential just only have 2.62mV offset. By pass ISO1540, there are no offset voltage between two side I2C. Do you have any comments for it? Thank you. 

Bypass ISO1540,

BR

Patrick