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IWR6843: wake up time delay

Lenio Cacula
Genius 16700 points
Part Number: IWR6843
Other Parts Discussed in Thread: MMWAVE-DFP

In this particular application, power consumption is critical. If we setup the IWR6843 to be in low power mode to wake up from a signal  coming from an external microcontroller, what would be the expected latency to receive a reading from the RADAR? What is your recommendation to minimize power consumption in this configuration?

Thank you!

  • 0
    TI__Mastermind 23725 points

    HI

    From a complete power down to  active sensing you can expect around 100ms of time.

    What are the application specific needs and interaction that the host needs to have with the mmWave device.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    Prodigy 20 points

    Hello,


    I was the one who originally posed the question to Lenio and he relayed the information for me to the forum.

    We would like to design a product that is in a low power mode with with only a few low-powered sensors active for the majority of the time. If one of these sensors gets a reading that triggers a "detection event", we would like to power on or wake up the radar as quickly as we can to start taking measurements of this "detection event". To this end, we're interested in knowing:


    1) How long does it take from the time that the IWR6843 receives a power on signal to sending data that a microprocessor can interpret?

    2) The same thing as 1, but starting from sleep mode.

    3) Is there any data available for the time that it takes to go into sleep mode?

    4) I didn't ask this originally, but I am also interested in knowing if there is any data available about the power consumption of the IWR6843 while it's in sleep mode.

    It's good to know that around 100 milliseconds will likely be the ceiling for how long it will take to start getting data. I would also appreciate any information you have on the wake-up time of the radar.

    Thanks,

    RJ

  • 0 in reply to Robert Fendricks
    TI__Guru 50240 points

    Hi RJ

    There is no official sleep mode for the IWR6843 device but there are various levels of power-down that do resemble sleep mode. My team has investigated a method of various clock gating and I will get the timing measurements for you by the end of the week.

    Would you elaborate what functionality you require in sleep mode.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    TI__Guru 50240 points

    Apologies RJ, I didn't mean to click the TI Thinks Resolved Button. I have marked this thread as an open issue still.

    Regards,

    AG

  • 0 in reply to Robert Fendricks
    TI__Guru 50240 points

    Hi RJ

    It is possible to clock gate both the BSS and DSS along with a reduction in the clock frequency of the MSS to put the device in a setting that resembles sleep mode. These functions are very fast to use and each one only takes 1-3 us to enable and disable.

    In a future release of the mmWave-DFP there will be functions to power on and off separate portions the device. I am not at liberty to discuss either what these functions are or when they will be released right now. Although for the sake of your calculations I can confirm that a full power down cycle is around ~150 us and a power up cycle is ~30 us.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 20 points

    Akash,

    Thank you for the additional information, and sorry for the delayed response.

    The exact functionality that we need during "sleep mode" at this point is undefined, our main concern was more "what is the lowest power mode we can get this thing into and how fast can we get it out of that mode?" I guess sleep mode here is technically the wrong term in this case, but it is good to know that we can get this part into a lower power mode at some point in the future.

    I'm guessing that information on the power consumption of the chip during these different power modes is also something you can't disclose at the moment?

  • 0 in reply to Robert Fendricks
    TI__Guru 50240 points

    Hi Robert

    Your assumption is correct, nor can I disclose any dates. Although I can confirm this is something our engineers are actively working on.

    Regards,

    AG