MAX86141AENP+T: FAQ

Created over 5 years ago

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Are there any issues with the MAX86141 LED driver?

There are no known issues with the MAX86141 LED driver. What may be perceived as an issue is actually related to LED thermal drift, which can appear to affect photodiode performance. Specifically, ambient…
For MAX86141,Which PD and LED does maxim recommend?

LED > Green Osram E1128, Osram LT PWSG > 3-in-1 (R+IR+G) SHF7013 PD > Ratio* 2:1 Vishay VEMD8080 > Ratio 1:1 (less recommended) Vishay VEMD5010, VEMD5080 Optical module: > (LED…
For the HW design of MAX86141, can the Gsensor be connected to the main MCU instead of the sensor Hub MAX32664?

The Gsensor can be connected to the main MCU or the sensor Hub MAX32664, but the following points should be noted, 1. The Gsensor is connected to the main MCU and can read the data directly when it…
How can I use just one photodiode in the MAX86141?

Let the unused photo-diode input pin, PD1 (/ 2 ) _IN, float. Alternatively, if you just need one photodiode you can use MAX86140.
How PI parameter works for HR and SpO2 algorithms?

PI is one aspect of PPG signal quality. It is defined by AC/DC of PPG signal. The PI value varies for different subjects, diffent optical designs. Both HR and SpO2 algorithm likes higher PI PPG signal…
Is there a known issue with LED current drift?

LED thermal drift is normally expected within the first few minutes of operation due to the heating of the LED package, especially when driven with high current or long integration times (T INT ). As the…
Maxim bio sensor algorithm takes very long time to report HR/SpO2 data.

Maxim algorithm v1.9.3 needs around 20s-30s to get HR numbers. For SpO2, it costs around 45s if signal quality is good. Our algorithm team has plan to shorten that and will release new version later.…
Should I align the optical center of the LEDs for the wrist based SPO2 monitoring wearable design?

It is advised to align the optical center of the LEDs as SPO2 monitoring requires the RED and IR light to have similar optical paths.
What does FDM/CDM fliter mean in MAX86141?

The FDM and CDM is the ambient light calulating method. FDM named Forward difference method, while CDM named Central Difference Method; FDM means only sample ambient light and LED exposure once per…
What is the requirement for algorithim to output stable SpO2 output?

First of all, no motion. Current PPG based SpO2 solution cannot support testing SpO2 in motion as the IR and Red channel PPG signals are too weak and unstable in motion. Secondly, PI should be reach…

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MAX86141AENP+T: FAQ

Are there any issues with the MAX86141 LED driver?

For MAX86141,Which PD and LED does maxim recommend?

For the HW design of MAX86141, can the Gsensor be connected to the main MCU instead of the sensor Hub MAX32664?

How can I use just one photodiode in the MAX86141?

How PI parameter works for HR and SpO2 algorithms?

Is there a known issue with LED current drift?

Maxim bio sensor algorithm takes very long time to report HR/SpO2 data.

Should I align the optical center of the LEDs for the wrist based SPO2 monitoring wearable design?

What does FDM/CDM fliter mean in MAX86141?

What is the requirement for algorithim to output stable SpO2 output?

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