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IWR6843ISK: Comparison of IWR6843ISK, IWR6843ISK-ODS & IWR6843LEVM

Weng Fei Low
Prodigy 40 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843LEVM, , , IWR6843, IWR6843AOPEVM, IWRL6432

Tool/software:

What are the main differences between IWR6843ISK, IWR6843ISK-ODS and IWR6843LEVM evaluation boards? How about in terms of documentation/demo/examples support?

  • 0
    TI__Mastermind 22847 points

    Hello,

    The difference between the evaluation modules IWR6843ISK, IWR6843ISK-ODS & IWR6843LEVM is the antenna geometry found on the board. They all use the same IWR6843 chip to do radar data input, processing, and output. IWR6843ISK has the most examples and documentation with premade configurations for the ISK antenna geometry, but all three EVMS can run the same examples once antenna information is corrected. Without changing antenna pattern information found within a configuration file, the processing that generates outputs like point cloud and tracking will be incorrect.

    I would also recommend IWR6843AOPEVM, which has the antenna built into the chip itself. This EVM also has the same if not slightly more documentation and examples compared to IWR6843ISK EVM. The IWR6843AOPEVM has better elevation resolution compared to ISK, and has equal azimuth to elevation resolution. ISK has better azimuth resolution compared to AOP, with azimuth resolution being better than elevation. ISK-ODS and AOP have the same antenna geometry, ISK-ODS's antenna is on the EVM itself rather than the chip.

    Best Regards,

    Pedrhom

  • 0 in reply to Pedrhom Nafisi
    Prodigy 40 points

    Hi Pedrhom,

    Thanks for the reply. I guess this page https://dev.ti.com/tirex/explore/node?node=A__AB9Ek2o7Z7KxVGvvfm7HCA__radar_toolbox__1AslXXD__2.20.00.05&placeholder=true summarizes the specs of the antenna designs.

    1. Just to confirm, does IWR6843L refer to IWR6843LEVM?
    2. Comparing ISK-ODS and AOP, what are the limitations of having an antenna on package? Is TX-RX leakage an issue? Limitation on the no. of concurrent transmitters? Any other limitations?
    3. Can the demos/examples for only ISK, be run on ISK-ODS or AOP after changing antenna pattern information in the provided config file, and vice versa?
    4. Why does it seem that the demos/examples for IWR6843/AOP less complete than IWR6432/AOP? Is there a way to perform SPI data capture for IWR6843/AOP, similar to https://dev.ti.com/tirex/explore/node?node=A__Ad6H1W8onxAAEnb5ySeQZQ__radar_toolbox__1AslXXD__LATEST&placeholder=true?
  • +1 in reply to Weng Fei Low
    TI__Mastermind 22847 points

    Hello,

    1. Yes, but this is simply the 6843 using the low power 6432's antenna pattern. It does not actually have the low power architecture 6432 has.

    2. There are a few limitations of antenna on package for 6843. Many companies want to design their own antenna to min/max for their own use case. For that then they will need a non-AOP 6843. But many companies that lack RF experience do not want to design their own antenna and want a small form factor, for them we have the AOP variant. These EVMs are merely reference designs that help evaluate the chip itself. 6843AOP has worse heat dissipation due to the thinner package so it can get hot to the touch. Also the antenna coupling due to the antennas proximities to each other is slightly worse.

    3. Yes

    4. SPI Data Capture is for specifically unprocessed, unfiltered, dumped I/Q sample data straight from the ADC buffer grabbed from the sensor front end. This is for development of processing algorithms from complete scratch. For outputs such as a point cloud, tracker, 1D FFT, heatmap, classification, etc, all this can be done via UART and is the expected protocol for these examples and does not require anything extra.

  • 0 in reply to Pedrhom Nafisi
    Prodigy 40 points

    Hi,

    4. I'm precisely looking at this possibility. Is there anyway the SPI data capture demo for IWRL6432 can be adapted for IWE6843?

  • 0 in reply to Weng Fei Low
    TI__Mastermind 22847 points

    Yes, we have the SPI driver code and a test example code for it on 6843. You can reference this to send the radar cube rather than the test message.

    Best Regards,

    Pedrhom