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IWR6843AOPEVM: TI Sensor received does not match their own documentation

DAVID RASKINO
Prodigy 25 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: MMWAVEICBOOST

We are having issues with the TI mmWave carrier boards. The IWR6843AOPEVM we received has an unexpected heatsink on it that is totally in the way, making it impossible to mate with the "MMWAVEICBOOST" carrier board. I've attached the images below showing the problem: 

How are we supposed to do anything with this when what we received doesn't match their own documentation?

  • 0
    TI__Mastermind 33805 points

    Hello,

    This issue will be resolved on the upcoming rev of the board.

    Although it is strongly recommended, the Heat sink is not a mandatory requirement for the EVM use.  Due to the smaller size of the IWR6843AOPEVM it is likely to get warmer than other larger sized EVMs on the mmWave Radar portfolio, therefore care needs to be taken to ensure the junction temperature does not exceed 105 deg C. 

    The plot below shows measurement of junction temperature vs duty cycle taken with and without the heat sink. As seen in the plot the EVM can safely operate up to 50% duty cycle without the heat sink.

     Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    Prodigy 25 points

    I also notice that, with the heatsink attached, the mmWave IC and the heatsink on the IWR6843AOPEVM assembly get quite hot. I don't have an IR thermometer handy, but a thermocouple is reading 55C after about 5 to 10 minutes of "on" time, with the device sitting in a room with 19.5C ambient temperature.

    The high temperatures recorded above are present anytime I have USB plugged in (even if I'm not consciously doing anything with the board). Does that sound normal to you?

    In the post you linked to on the E2E support forms, you shared a chart that implies that the IWR6843AOPEVM should only be used with a 50% duty cycle. What time frame is that 50% duty cycle over? In other words, does 50% duty cycle mean something like "30 seconds on; 30 seconds off" or "60 minutes on; 60 minutes off" or ???