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ADS1235: DRDY help

Adam Daluga
Expert 6385 points
Part Number: ADS1235

Hi,

The ADS1235 has an DRDY to indicate A/D data is ready, normally we can use external interrupt configured to DRDY Pin (falling edge), but we cannot getthis method to work forthe  ADS1235. My question is how does DRDY work in the ADS1235?   

Thanks,

Adam

  • 0
    TI__Guru** 113765 points

    Hi Adam,

    DRDY for the ADS1235 works just like you stated.  See Figure 2 in the ADS1235 datasheet.  The DRDY will transition from logic high to logic low when the new conversion result is available to be read out from the device.

    Are you using the dedicated DRDY pin? Or are you using the DOUT/DRDY pin to determine the EOC?

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    TI__Expert 6385 points

    Hi Bob,

    Thanks for the help!I am using the dedicated DRDY pin.

    I cannot find the logic high to low, maybe I need configure DRDY pin?

    Best,

    Adam

  • 0 in reply to Adam Daluga
    TI__Guru** 113765 points

    Hi Adam,

    For DRDY to toggle, the ADS1235 must be converting.  Also, both AVDD and DVDD must be at nominal operating voltage.  Various ADS1235 device pins must also be in the correct settings.  The PDWN and RESET pins must be pulled high, and the CLKIN pin pulled low.  The START pin can be either high or low.  When pulled high, the ADS1235 should be set to continuous conversions.  If the START pin is pulled low, then the START command must be issued to start the conversions.

    Best regards,

    Bob B