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ADS1158: DRDYZ asserted without START

Part Number: ADS1158

I have an older design with ADS1158, no issue. We moved the same design to an external board and observed and extra DRDYZ. My question is what will cause DRDYZ asserted by itself without a START. I didn't send a pulse convert command.

I have attached two captures below, Never mind about the CS2 on NEW_DESIGN, it was not connected.

Thanks

Chris

OLD_DESIGN

NEW_DESIGN