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  • AFE4490: Diagnostics in Push pull configuration

    Part Number: AFE4490 Tool/software: Hi, We are using AFE4490 in one of our designs. We are using a push pull configuration with common anode connection for the LED. We are facing problems for detecting LED shorts. Mainly the LED which is connected between…

  • AFE4490: How to possibly calibrate the LED brightness without stopping acquisition

    TI Thinks Resolved
    Part Number: AFE4490 Tool/software: I'm trying to build a device that acquires real time SpO2 value. Right now this is the working, -Continuously acquire ambient and normal Red and IR values over a period of 2 seconds using DMA -Every 3rd cycle, acquisition…

  • AFE4490: Ambient canceled Red and IR data returning zero from SPI readback.

    TI Thinks Resolved
    Part Number: AFE4490 Tool/software: SPI readback is returning zero for ambient canceled red and infrared data after the AFE runs for around twenty minutes.

  • AFE4490: AFE4490 bypass mode

    Part Number: AFE4490 Hello, I have a question about the bypass mode. I see that bypass is suitable for bypassing normal procedures. If I don’t need it, can I connect it empty. Below is my circuit diagram,Could you please check it out for me?

  • AFE4490: Is the SCLK an input pin, output pin, or bi-directional pin?

    Part Number: AFE4490 Tool/software: Hi TI's experts, I am new to AFE4490. While reading its datasheet, I am little confused by the pin usage of SCLK and related read/write mode. On the datasheet(SBAS602H –DECEMBER 2012–REVISED OCTOBER 2014), P52,…
    • Answered

  • AFE4490: Change the ambient light cancellation current value and obtain waveform above 1.2V, which exceed the input full scale of the ADC. why?

    Resolved
    Part Number: AFE4490 Tool/software: Hi Ti experts, During parameter tuning, I swept the AMBDAC of its allowed values while kept rest register values unchanged. When the AMBDAC value equals 3μA， both the IR current and the RED current exceed 1.2V（after…
    • Resolved
    • Answered

  • AFE4490: About the default settings [Factory shipment values]

    Resolved
    Part Number: AFE4490 Tool/software: Is the default or factory value 0000? Or is it the Reset Value = **** part of the datasheet? please tell me. By the way, with the settings in the datasheet If I accidentally write 1 in a place like the one where…
    • Resolved

  • AFE4490: SNR questions

    Part Number: AFE4490 Dear Sir/Madam, I purchased AFE4490SPO2EVM and tested its SNR. I have questions about this AFE's SNR performance. I was looking for the SNR measurements in the datasheet, and it seems that SNR was presented as noise-free bits…
    • Answered

  • AFE4490: AFE4490 ADC measuring voltage range

    Resolved
    Part Number: AFE4490 Hi, I'm KH and I wondering AFE4490 ADC measuring voltage range. By datasheet of AFE4490, LED1 and LED2 sample range is from +/- 1.2V. What I wonder is why from -1.2V to 0V are needed to ADC measure. Thank you in advance…
    • Resolved

  • AFE4490: Afe 4490 data capture

    Part Number: AFE4490 Hello TI team, We are currently developing an SpO2 device using the AFE4490 with an STM32 MCU. We have conducted tests using a simulator and a reference SpO2 machine. During our tests, we observed discrepancies in the data acquisition…

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