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ADS1248 Burnout function

Takumi Suzuki1
Mastermind 8630 points

Other Parts Discussed in Thread: ADS1248, ADS1118EVM

Hi,

My customer is considering to use "Burnout" function of ADS1248 to detect "cable error - snapping of a wire".

I think that to use "Burnout current" is the most apropriate way to detect for ADS1248.

Would  you please let me know anyother useful way to detect cable error, if possible?

And do you have anything application material or reference manual to use "Burnout" of ADS1248?

Thanks a lot in advance.

Best Regards,

  • 0
    TI__Guru* 99465 points
    Takumi-san,


    We don't have any application notes on the use of the burnout current sources for the ADS1248. However, they are not difficult to use or understand.

    If you want to check to see if the sensor is burnt out, you use the current sources. One puts current into the ADC positive input and the other pulls current from the negative input. This pulls the ADC inputs apart - ideally to opposite ends of the voltage range. This way, when the sensor has burned out, the ADC reads full scale or 7FFFFFh for the output.

    Another way that this is often done is to take the ADC inputs and tie the positive input to AVDD and the negative input to AVSS through large resistors. This will do the same thing. If you look at the ADS1118EVM user guide, the schematic shows there are 1Meg resistors that do this same thing when measuring thermocouples.


    Joseph Wu
  • 0 in reply to Joseph Wu
    Mastermind 8630 points

    Hi Joseph-san,

    Thank you very much for your kind reply!

    I understood well.

    Best Regards,