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AWR2243: No output on SYNC_OUT pin

user4830157
Intellectual 370 points
Part Number: AWR2243

Hello,

I have a custom board with a single AWR2243 chip controlled via SPI and operating in development mode SOP[001]. I am trying to probing the SYNC_OUT pin (P11) using an oscilloscope but getting no output after triggering the frame. Do you have any idea, what the issue could be?

Thanks.

  • 0
    Intellectual 370 points

    Hello,

    Even when I configure the chip in cascade mode as master there is no outout. Any idea?

    Thanks.

  • 0 in reply to user4830157
    TI__Mastermind 31680 points

    Hello, 

    You should be able to see a trigger on the SYNC_OUT signal. The pulse width of the SYNC_OUT is only around 25ns, so maybe it is too short for you to capture on the scope? 

    Also, where are you trying to probe the signal? There might be a series resistor missing in your path. Could you check your schematic once?

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Intellectual 370 points

    Hello,

    I have a test pin that is connected directly to P11 (SYNC_OUT/SOP1) of the chip and I am probing it using a high-end oscilloscope.

    Now I can see the 25 ns pulse when the device is set as Master but I cannot stop the frame afterwards, if the number of frames is set to 0 (infinite) and calling rlFrameStartStop API to stop the frame. Although, there is no error return from the rlFrameStartStop API, I can still see the pulse on the oscilloscope.

    What I am doing wrong here?

    Thanks,

     

  • 0 in reply to user4830157
    TI__Mastermind 30165 points

    Hello,

    Do you have the same issue if you use the rlSensorStop API? What if you set it to a finite amount of frames, do you see the sync out pulse stop after the frames end?

    Regards,

    Adrian