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RDY* Output on AD7192 is not working

Question asked by ogradyg on Dec 15, 2016
Latest reply on Dec 19, 2016 by JellenieR

I'm using an AD7192 in a strain gage application. I have a 5V analog supply, 3.3V digital supply, external 4.915200MHz crystal.

 

The DO/RDY* pin never appears to signal a Ready condition. Over the SPI, I am able to reset the part, read and write the  registers. I have configured the part to continuously convert at 50Hz and I am reading at this same rate (currently timed internally by my microcontroller).

The attached image shows the DO/RDY* pin high whenever the CS* is not active (even when the Status register indicates that the part is/was in a Ready state). I have a 100K pull-up on the DO/RDY* line, the SYNC* input is tied to the digital supply.

I have tried another part (both with a 1512 date code).

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