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ISO1541: SCL 2 didn't follow SCL 1

Part Number: ISO1541

Hello Sir:

Please refer our waveform as below.

Ch1 is SCL1, Ch2 is SCL2

Ch1 is SDA1, Ch2 is SDA2

And below is our application circuit.

Would you please let us know why the SCL2 can not rise up at the last of waveform?

That effect our AFE device communicate failed. 

Looking forward your feedback.
Thanks a lot.