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ADS131M08: To detect the differential input

Prakash B B
Prodigy 160 points
Part Number: ADS131M08
Other Parts Discussed in Thread: ADS131E08

Tool/software:

Hi,

I am interfacing ADS131M08 to FPGA. Is there any way to identify whether the inputs(differential) are connected to sensor or not?

Regards

Prakash

  • 0
    TI__Mastermind 45715 points

    Hi Prakash,

    This ADC does not have a open-wire detection feature, however it is possible to pull up the input to maximum input voltage (e.g. 1.2V full scale) if this voltage is not in the normal signal range in your system.

    Update: you can also consider to use ADS131E08 which is a 8-ch simultaneously sampling ADC, it has integrated comparators to detect out-of-range conditions on the input signals, so your microcontroller does not need to monitor the conversion code and judge if the input has reached the full scale voltage or the threshold you set in the internal registers.

    BR,

    Dale

  • 0 in reply to Dale Li
    Prodigy 160 points

    Hi Dale,

    Thanks for the response. Pulling-up to FS requires circuit modifications. Without that, is there any alternative?

    Regards

    Prakash

  • 0 in reply to Prakash B B
    TI__Guru 52296 points

    Hi Prakash B B,

    Dale is out today, so I can provide feedback

    There is no way to determine if the sensor is floating just by reading the input voltage, because a floating input voltage is indeterminable. Therefore, you could not distinguish it from a valid reading. You would need to add pull-ups or comparators to actually sense the input voltage in this condition

    -Bryan