AFE4490SPO2EVM: Operating just one LED?

GreenAndGrey

Part Number: AFE4490SPO2EVM
Other Parts Discussed in Thread: AFE4490

I'd like to operate just one LED and I've configured the EVM to do so as shown in the screenshot. But this means that 50% of the cycle is wasted. I'm not able to change the duty cycle to be higher than 25%, can this be achieved in the AFE4490?

over 7 years ago

0 Prabin Yadav over 7 years ago

TI__Genius 12575 points

Hi,

Duty cycle higher than 25% is limited by the GUI, but it can be done with the AFE4490.
However why do want to use higher duty cycle as it will increase you power consumption and if the LED gets heated it will nonlinear artifacts.
Just heat of the LED might also be uncomfortable for the user.

Regards,
Prabin

0 GreenAndGrey over 7 years ago in reply to Prabin Yadav

Expert 1060 points

Hi Prabin, thank you for the quick response. You're right, I don't need a higher duty cycle but I was looking for a way to make the one LED arrangement more efficient and capture the unused cycles. I also don't need a higher sampling rate - 100 Hz will do. What would you recommend?

0 Prabin Yadav over 7 years ago in reply to GreenAndGrey

TI__Genius 12575 points

Hi,

Yes, 100Hz would be sufficient.

Regards,
Prabin

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AFE4490SPO2EVM: Operating just one LED?