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Question about AFE4490

RaeHo Kim
Prodigy 10 points

Other Parts Discussed in Thread: AFE4490

I have a question about AFE4490(Pulse Oximeter).

I read about Transmit power is (0.1mA + Average LED Current) in Datasheet.

When we suppose that Tx voltage is 3.0V, What is Average LED Current?

Is it mean only 50mA, 75mA, 100mA, 150mA and 200mA? (<- things that we can select as LED current)

Let me know How to calculate 'Average LED Current'.

Thank you so much.

  • 0
    TI__Mastermind 18285 points

    The default LED current for Red and IR that is used in our GUI is 5.08mA. The Full-Scale LED Current is 75mA that is used in the GUI. The default power up of the part is 50mA. To find out how to calculate each of these, please refer to equations 3 and 4 on page 59 of the datasheet.