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 light intensity may drift over time on one channel of a photodiode due to LED thermal drift, expected within the first few minutes of operation, and changes in LED temperature and luminous intensity. Additionally, the opto-mechanical design might contribute to this problem.
To isolate this issue, follow these steps:
- Test all devices in a dark room environment using optical enclosures or a black bag with no reflection.
- Validate signal quality.
- Test the device with and without the enclosure to determine if the enclosure is creating an offset.
- Ensure the inside of the enclosure is light absorbent to prevent internal reflection.
- Perform tests without human subjects to remove variables.