AFE4950: SPO2 calculation whit AFE4950

Dobromir Todorov

Prodigy 30 points

Part Number: AFE4950

Tool/software:

Is there any example for SPO2 calculation whit AFE4950.

Thank you in advance.

over 1 year ago

0 Ryan Andrews over 1 year ago

TI__Guru 69066 points

Hello Dobromir,

Thank you for your post.

The AFE4950 only provides the raw data captured from the photodiodes during Red and IR LED phases. The calculation of SpO₂ itself is done in post processing using the ratio of ratios.

R = [AC_RED/DC_RED] / [AC_IR/DC_IR]

SpO₂ = A−(B*R)

Regards,

Ryan

0 Dobromir Todorov over 1 year ago in reply to Ryan Andrews

Prodigy 30 points

Hello Ryan,

Thank you for your answer.

Yes we use this formula but the results are vary strange and wrong. We think the settings in on AFE4950 is wrong is there any example for SPO2 getting red and ir data.

Thank you in advance.

Best regards

0 Ryan Andrews over 1 year ago in reply to Dobromir Todorov

TI__Guru 69066 points

Hello Dobromir,

Have you tried using the register map configuration Excel tool? I will contact you offline and you can share the settings with me which you are using.

Regards,

Ryan

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AFE4950: SPO2 calculation whit AFE4950