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IWR6843ISK: IWR6843ISK standalone power with Long Range People Detection Lab

Hardware Engineer
Prodigy 70 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: MMWAVEICBOOST, , DCA1000EVM, IWR6843

I am using IWR6843ISK in standalone mode (no MMWAVEICBOOST) with the Long Range People Detection Lab. According to this thread, I need to supply 5V 2.5A power through TP12 and TP13 connectors for beamforming:

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/974809/iwr6843isk-tx-beamsteering-with-dca1000evm/3601932#3601932

But this second thread says supplying power through the USB port is sufficient for Long Range People Detection:

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1013404/iwr6843isk-long-range-people-counting-lab

Can you please clear this up? Do I need to supply power through TP12 and TP13 if I use IWR6843ISK in standalone mode with Long Range People Detection Lab? From my testing I don't see a difference in performance either way.

  • 0
    TI__Genius 17265 points

    Hi,

    I believe the first thread is specifically regarding a standalone evm that is attached to the DCA1000EVM (for raw ADC data collection) while the second thread is referring to running just the device in standalone mode. If you are just running the demo on the EVM in standalone mode, the USB connector should be sufficient.

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 70 points

    Thank you for your response. In your Long Range People Detection Lab website, it says: ( dev.ti.com/.../node )

    "The beamforming/beamsteering feature described earlier requires the ICBOOST board to facilitate higher power draw required to use this feature. Using the ISK board standalone will result in poor RF performance. This usually manifests as a noisy point cloud."

    Can you please also clarify if this means we should not use the IWR6843ISK EVM standalone with USB power for Long Range People Detection?

  • 0 in reply to Hardware Engineer
    TI__Genius 17265 points

    Hi, 

    Understood. I will investigate this further to verify the power requirements. In the meantime, can you try running the demo using a powered USB hub, to get maximum power without making any modifications.

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 70 points

    Do you have any update on this?

  • 0 in reply to Hardware Engineer
    TI__Genius 17265 points

    Hi,

    My apologies for the delay on this. Could you please take a look at section 9.3.1 of the iwr6843 datasheet? I believe that gives the most concise explaination of the power needs for beamforming. Let me know if you have have further questions.

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 70 points

    This is what that section says:

    www.ti.com/.../iwr6843.pdf

    9.3.1 RF and Analog Subsystem
    The RF and analog subsystem includes the RF and analog circuitry – namely, the synthesizer, PA, LNA, mixer, IF, and ADC. This subsystem also includes the crystal oscillator and temperature sensors. The three transmit channels can be operated up to a maximum of two at a time (simultaneously) in 1.3-V mode. The three Transmit channels simultaneous operation is supported only with 1-V LDO bypass and PA LDO disabled mode for transmit beamforming purpose, as required. In this mode, the 1-V supply needs to be fed on the VIN_13RF1, VIN_13RF2, and VOUT PA pin; whereas, the four receive channels can all be operated simultaneously.

    It doesn't say anything about power requirement...

  • 0 in reply to Hardware Engineer
    TI__Genius 17265 points

    Hi,

    After verifying internally, I can confirm that the 100 meter configuration for Long Range People Detection, which uses beamforming/steering, does require additional power, through the mmWaveICBoost. 

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 70 points

    Thanks for your response. Can you please also confirm if the 50 meter configuration for Long Range People Detection requires additional power?

  • +1 in reply to Hardware Engineer
    TI__Genius 17265 points

    Hi,

    Only the 100 meter configuration should require additional power, since it is the only configuration that uses beamforming/beamsteering.

    Best Regards,
    Alec