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ADS1271: DRDY pin always HIGH

Miguel Amezcua Peregrina
Genius 4015 points
Part Number: ADS1271


Hi

Im using the ADS1271 for a project of mine. I have an analog filtering section first and then it goes, from 0 to 5V, to the ADS1271 and then to the MCU.

The ADC was working properly until yesterday. For some reason, even when the SYNC pin is on HIGH (it is attached to a power source), the DRDY pin remains on HIGH voltage, like if the ADS wasn't converting any data.

The data is actually arriving from the analog filtering 

When testing an other board, which is exactly the same, everything worked fine. 

I think the component just died, but the question here is what could kill the component if everything was working fine two days ago? 

I attach the schematic of the ADS

  • 0
    TI__Guru 66906 points
    Hola Miguel,

    It's difficult to say what may have caused the device to fail. One possibility that we have seen in the past is that, when the potential between AGND and DGND exceeds the Absolute Maximum Ratings, it can cause permanent failure of the ADC. Make sure that these two nodes are shorted together somewhere on your board, preferably as close to the device as possible.

    Have you tried bringing the /SYNC/PWDN pin low and high again? Have you verified that the CLK signal is still ok?

    Best Regards,