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  • TI Thinks Resolved

TIDA-010029: Need some perameter details

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Part Number: TIDA-010029

Hello,

I am not getting some parameter details from document of TIDA-10029.

user guide : https://www.ti.com/lit/ug/tidueg6a/tidueg6a.pdf?ts=1594374142273&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-010029.

equation 1 from that document is 

R=(ACrms of red /DC of red)/(ACrms of IR /DC of IR).

what are all parameter which is use in that equation? 

can any on explain?

Thanks ,

Dinkar 

  • Hello Dinkar,

    All the parameters are explained in detail with waveforms in this app note: https://www.ti.com/lit/an/slaa655/slaa655.pdf

    Regards,

    Sanjay R. Pithadia

  • In reply to Sanjay Pithadia:

    Hi Sanjay

    Thanks for your quick reply.

    I studied document which you refer.
    I understand that
    ACrms of Red means calculated RMS value of PPG data of Red LED.
    ACrms of IR means calculated RMS value of PPG data of IR LED.
    Am i correct or not?

    But i didn't getting any idea of DC of red and DC of IR. can you just explain here?

    Thanks,
    Dinkar

  • In reply to dinkar patel:

    Hello Dinkar,

    DC means the DC offset value of the wavform. DC of red means DC of red LED waveform and DC of IR means DC of IR LED waveform. (Refer to the waveforms in app note)

    Hope it is clear.

    Regards,

    Sanjay R. Pithadia

  • In reply to Sanjay Pithadia:

    Hello Sanjay,

    Thank you for your quick reply.

    Did i means that  DC of red means (lowest instantaneous value of red PPG data - 0)?

    Thanks,

    Dinkar

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