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ADV7610 I2C answers xFF for every registers read

Question asked by JeffS on Oct 14, 2014
Latest reply on Oct 25, 2014 by JeffS

Hi,

 

We are using the ADV7610 and for an unknown reason, some prototypes reads only xFF for every I2C register access.  Some other will answer xFF on a few occasion only.  What can make the chip to answer with xFF?  The bus is at 100KHz.  The acknowledge is present and the same bus is shared with other items without problem.  This xFF really comes from the chip.  SCL and SDA on the scope looks good.

 

Thanks,

 

Jeff

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