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Original question:

AFE4950: SPO2 calculation whit AFE4950

AFE4950: Data converters forum

Edmond Yuen
Prodigy 10 points

Part Number: AFE4950

Tool/software:

Hi I'm testing SPO2 by AFE4950_Register_Generation_v2.1_SpO2_10ph.xlsm with AFE4950EVM kit. It will has 4 data - TIA-3, TIA-5, TIA-8 and TIA-10. How can I calculate SPO2 by those data? Thanks in advanced.

  • 0
    TI__Guru 68966 points

    Hello Edmond,

    Thank you for your post. The calculation of SpO2 from AC and DC components of Red and IR are fairly well documented. However, accurate % SpO2 is computed based on the
    empirical calibration of the ratio of ratios for the specific device. We generally do not go into the details of the SpO2 calculation as w    e leave the implementation of the algorithms to the users.

    The application note below gives a little more background about this as well as useful techniques for acquiring a good PPG signal.

    https://www.ti.com/lit/pdf/slaa655

    Regards,

    Ryan