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IWR6843AOP: WWMAVE selection problem: Is there a more suitable one that can meet the requirements?

xq cao
Prodigy 70 points
Part Number: IWR6843AOP
Other Parts Discussed in Thread: IWRL6432AOP, , IWR6843, IWRL6432AOPEVM, IWRL6432

For the IWRL6432AOP, it can recognize 3 people when using an external MCU, but cannot do so with its own on-chip MCU. However, both MCUs are of M4F grade—is the difference in memory? If an external SPI is used, can it achieve the same recognition effect as using an external MCU?
Looking to select a chip with functions including recognizing 8 people in a space, counting the number of people entering and exiting the space, bed exit detection, and prolonged sitting detection. Could you recommend a suitable chip? Can the IWR6843AOP meet these requirements, or is there a better solution?
To realize the above functions, is an external MCU required? If no external MCU is used, can these functions be implemented with the chip's own on-chip MCU?
Is there a roadmap for the mmwave series that can be provided?
  • 0
    TI__Mastermind 22391 points

    Hi,

    IWRL6432AOP can support 3 people counting/tracking without any external MCU. Can you let me know why you say an external MCU is required? Is this your observation from testing that you have done? 

    For 8 people counting/tracking, yes, I would recommend IWR6843. IWR6843AOP may be sufficient depending on the mounting and range requirements otherwise you may wish to use the ISK style of antenna. Will the sensor be 'wall-mounted' or 'ceiling-mounted'? How large of a space are you looking to cover?

    Best regards,

    Josh

  • 0 in reply to Josh Dye
    Prodigy 70 points

    1. IWRL6432AOP想确认内部和外部MCU的区别是因为IWRL6432AOPEVM的开发板使用的是外部MCU，担心如果不加外部MCU仅使用芯片内部的MCU会对侦测结果和品质有影响。
    2. 壁挂式和吸顶式天线上或者指标上会有哪些差异？

    3. 我们计划侦测水平+/-60度，垂直+/-30度，最大侦测距离8米的空间，AOP方案能否实现？

    4. 如果要采用ISK风格的天线，在天线设计和调试上会不会有难度？  我们没有天线设计相关的仪器

    5. 另外顺便问下，IWRL6432AOP和IWR6843AOP，对于侦测人数的差异，是不是就是天线数量上的差异？算法上有改进吗？

  • 0 in reply to Josh Dye
    Prodigy 70 points
    Regarding the algorithm: Can the IWR6843AOP chip's built-in algorithm achieve the following functions?
    1. People counting in a freely designated area of a space
    2. People counting for entry and exit in a designated space
    3. Bed exit detection
    4. Prolonged sitting detection
  • 0 in reply to xq cao
    Prodigy 70 points

    Change to English：

    1. We want to confirm the difference between the internal and external MCUs for the IWRL6432AOP. This is because the IWRL6432AOPEVM development board uses an external MCU, and we are concerned that using only the chip's internal MCU without adding an external one may affect the detection results and quality.
    2. What are the differences in performance or specifications between wall-mounted and ceiling-mounted antennas?
    3. We plan to detect a space with horizontal ±60 degrees, vertical ±30 degrees, and a maximum detection distance of 8 meters. Can the AOP solution achieve this?
    4. If we adopt an ISK-style antenna, will there be difficulties in antenna design and debugging? We do not have equipment related to antenna design.
    5. By the way, regarding the difference in the number of detectable people between the IWRL6432AOP and IWR6843AOP, is it only the difference in the number of antennas? Are there any improvements in the algorithm?
  • +1 in reply to xq cao
    TI__Mastermind 22391 points

    Hello, 

    I'm sorry, your latest reply was missed. I'll try to answer your questions below.

    xq cao said:
    We want to confirm the difference between the internal and external MCUs for the IWRL6432AOP. This is because the IWRL6432AOPEVM development board uses an external MCU, and we are concerned that using only the chip's internal MCU

    There is no external MCU used for radar data processing on the IWRL6432AOPEVM. I think you must be referring to the XDS110 which is only included on the development board for debugging purposes.

    xq cao said:
    What are the differences in performance or specifications between wall-mounted and ceiling-mounted antennas?

    The wall mounted antennas typically have a more narrow field of view in the elevation direction whereas the ceiling mounted antennas typically have a matching FOV in both azimuth and elevation. Please refer to the specific FOV of each antenna in our radar toolbox antenna database.

    xq cao said:
    We plan to detect a space with horizontal ±60 degrees, vertical ±30 degrees, and a maximum detection distance of 8 meters. Can the AOP solution achieve this?

    Yes, this is within the capabilities of the IWRL6432AOP device for detection of a person.

    xq cao said:
    If we adopt an ISK-style antenna, will there be difficulties in antenna design and debugging? We do not have equipment related to antenna design.

    Yes and no. Antenna design will be more involved from your perspective with the ISK style antenna because you will be designing the antenna directly to the PCB requiring special considerations for hardware design. We try to still make this as easy as possible by providing the design files and other documentation and resources however, the AOP solution will be less effort from your perspective. We provide this specifically for those customers who do not have a history of antenna design or expertise. 

    xq cao said:
    By the way, regarding the difference in the number of detectable people between the IWRL6432AOP and IWR6843AOP, is it only the difference in the number of antennas? Are there any improvements in the algorithm?

    There are multiple factors why IWR6843 can detect more people that IWRL6432. Yes the difference in number of antennas plays a part, but also, other factors like less memory, no DSP, slower clocked ARM and other architecture differences for low power.

    Best regards,

    Josh