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ADS1298RECG Respiration Set-up

Tom Myers2
Intellectual 475 points
Other Parts Discussed in Thread: ADS1298R

Hi,

I am using the ADS1298RECG Evaluation board and I am confused about whether I should be using two or four electrodes? My understanding is that RESP MOD P and RESP MOD N are the stimulus electrodes and two more electrodes act as the measurement electrodes?


So with the correct jumpers set (JP34 and JP35) I can use the ELEC_LA and ELEC_RA connections on the DB15 to act as my stimulus? I can also use the ELEC_V6 pin on the DB15 as one input, but what do I connect the "WCT" to pin 1>2 on JP33?

I have seen these registers in the supplied software, but I am unable to figure it out:

I would appreciate any pointers.

Thanks,

Tom

  • 0
    TI__Mastermind 38745 points
    Hey Tom,

    You only need two electrodes to measure respiration. Measuring respiration with the ADS1298R is a rather complicated process, but we recently revised the datasheet to include a new section on how to measure respiration using the internal modulation/demodulation circuitry on the ADS1298R. The new version of the datasheet is here: www.ti.com/.../ads1296.pdf and the section on the respiration measurement application begins on page 89. It will go through some of the theory behind respiration measurement as well as some practical considerations. if you still have questions about that after you read it, let me know.

    Regards,
    Brian Pisani
  • 0 in reply to Brian Pisani
    Intellectual 475 points
    Brian,

    Thank you for the link, I will study it.

    I am still confused by the eval board and the WCT settings when making RESP measurements. Since this is specific to the eval board then this is not mentioned in the linked documentation. Please could you provide some guidance.

    Thanks,
    Tom
  • 0 in reply to Tom Myers2
    TI__Mastermind 38745 points
    Hey Tom,

    The function of the WCT amplifier is independent from the respiration measurements and should not influence it. You can read about the functionality of the WCT amplifier itself in the datasheet.

    Regards,
    Brian Pisani