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ADuM3481 multichannel SPI interface application issue

Question asked by sam.shyu@wpi-group.com on Apr 3, 2014
Latest reply on Apr 13, 2014 by DaveC

Dear Sir,

 

We used isolated supply for each one and ADuM3481 for isolate SPI lines, from main CPU all 2 ADC's are sharing same DIN, DOUT, Clock lines and separate CS, When U602 and U605 both on board the SPI communication is failed (As attached waveform, CH2 is SDI1_MCU (VOD)). Removed which one, the other one on the normal communication.

Schematic as attached file.

Please help me how to solve this issue. Thanks!

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