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AFE4404EVM: Modifying the evaluation kit

Qasim Zia
Prodigy 220 points
Part Number: AFE4404EVM
Other Parts Discussed in Thread: AFE4404

Hi,

I want to ask that, if I modify the the kit by removing some of the resistors (Refer to the image attached). Would it be possible to communicate with AFE4404 using my own processor?

For instance, If I remove resistors R15 (AFE_CLK), R16 (AFE_RESET), R18 (ADC_RDY), R8 (AFE_SDA), R7 (AFE_SCL) from the kit, this would break the connections of AFE4404 with the processor on-board and I will put my connections at those point. However I will be using the supply available on board for AFE i.e TX_SUP, RX_SUP, IO_SUP.

  • 0
    TI__Genius 12575 points
    Hi Qasim,

    Yes, you can remove these series resistors to use external MCU to communicate with the AFE.
    However make sure that the signal levels are same as that of AFE.

    Regards,
    Prabin
  • 0 in reply to Prabin Yadav
    Prodigy 220 points
    Hi Prabin,

    Thanks for the response. Can I directly assign some value to the Register 22h which is for the LED current control to make sure that my communication is working? Because when I am assign 22h = 0x0030CF, LEDs do not turn on. So, I want to know that are there any other registers that have to configured before turning ON the LEDs
  • 0 in reply to Qasim Zia
    TI__Genius 12575 points
    Hi Qasim,

    There are total 18 bits ( Bit0 to Bit17) that are accessible in register 0x22.
    To light of the LED you have to program all the timing registers such as LED start and end.
    You can refer to Table 11 of the datasheet for the sample register setting.

    Regards,
    Prabin