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ADS1292R: Pin /DRDY strange output.

Part Number: ADS1292R

Hi everyone,

As I know the ADS1292R is in the RDATAC mode when it powered-up, so the DRDY pin will generates pulse continuely with the frequency chosen.

When I use it, I found that I could read and write the registers. But when I finished the registers configuration and sent RDATAC and START command, the DRDY pulse is different with its performance in power-up step.

Here are the result I got from the logical analyzer:

  

      

   

   

   

I think this kind of DRDY pulse should be correct, and it is what the pin DRDY generated after powering-up:

This is what the pin DRDY generated after I sent the RDATAC and START command:

The frequency is both 250Hz, because I set the CONFIG1 as 0x01.

Is there something I ignored or configured wrong?

Thanks for your help.

Yuhang