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AFE4404: can't turn on LED occasionally.

Bruce li
Genius 5580 points
Part Number: AFE4404

Dear TI Experts,

My customer is sampling data with their own AFE4404 board, they turn on LED every 5 minutes and sample data , and lasting 2 hours, during this process, they found there was 2~3 times the LED could be turned on.

They checked the code and didn't find any abnormal setting to the LED driver register.  Could you kindly advise the cause of this issue ? Is there any other register will cause LED stopping output ? Thanks a lot.

  • 0
    TI__Genius 12575 points
    Hi Bruce,

    First of all how are they stopping the LED for 5 minutes?
    And what they do to switch it ON?

    Regards,
    Prabin
  • 0 in reply to Prabin Yadav
    Prodigy 10 points
    Hi Prabin,
    The procedure about switch LED on like that:
    1. initialize RST Pin.
    2. drive down RST Pin.
    3.latency for 10ms.
    4.drive up RST Pin.
    5.latency for 10ms .
    6.drive down RST Pin .
    7.latency for 30us.
    8.drive up RST Pin.
    9.latency for 2ms.
    10.initialize the 4404 register.
    11.write 4404 register a nonzero value.
    12..latency for 20ms.
    We let RST pin pull down to enter sleep mode in order to stopping the LED.

    Regards,
    Healistrise