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iso7241 problem ?

Other Parts Discussed in Thread: ADS7886, SN6501

Hello every one

I’ve a problem with me isolated ADC I’m using  ADS7886 witch is  connected by spi  CS, MISO and CLK and stm32 microcontroller and this solution is working well without isolation but when I using ISO7241 and sn6501 to isolate power and signals

It doesn’t work and when I’ve used me oscilloscope to trace the signals I sow  

The following:

1 – Microcontroller side cs and miso signals is right

2 – Isolated side isn’t correct as shown in next fig 

as shown in fig the cs signal is passed from micro controller side to  isolated side but clk signal doesn't pass only the first pulse is passed

?????!!!!