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ADUM2251 Side2 Slave don't respond


I have a design (see Appendix), that makes some communication problems.

I have double-checked logic low level thershold and it is more than 0,9V since

Vcc and Vcc-p is 5V.

I have read this thread

and  I have also watched the Video from MSCantrell "How I2C Isolators work"

Video which is super helpfull.

When I use the digital Isolator for some reasons the MAX1238, don't pull down the data-line when

it should transmit the data-pattern. With no digital isolator everything works fine.

Has anybody an idea or hint ?

Thanks for your support.

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