TIDA-010029: Need some perameter details

dinkar patel

Expert 2025 points

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

over 3 years ago

0 Sanjay Pithadia over 3 years ago

TI__Genius 12845 points

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

0 dinkar patel over 3 years ago in reply to Sanjay Pithadia

Expert 2025 points

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

0 Sanjay Pithadia over 3 years ago in reply to dinkar patel

TI__Genius 12845 points

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

0 dinkar patel over 3 years ago in reply to Sanjay Pithadia

Expert 2025 points

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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TIDA-010029: Need some perameter details