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IWR1443: Power consumption for range measurement

Darren Jenkins
Genius 12541 points
Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091

IWR1443 experts,

Could you please help with some specific details on power consumption with the IWR1443?  A customer wants to detect the presence of an object 1 m away.  The object is very large and made of steel.  The application can be based on the TIDEP-0091.

http://www.ti.com/tool/TIDEP-0091

Low power is critical in this application so the MCU + IWR1443 will stay in a low power mode most of the time, then wake and take a measurement.

I looked at the Power calculator, but I don't have the numbers needed to enter there.  So, ...

How much power does the IWR1443 consume in low power mode? (I didn't see this in the datasheet).

How long does it take to wake from low-power mode up until taking a measurement?

How long would a single distance measurement take, as I've described above?

Thanks,
Darren

  • 0
    TI__Mastermind 30405 points
    Hi Darren,

    The power measurement process for TIDEP-0091 is described in the design guide. Could you please look into that?

    Regards
    -Nitin
  • 0 in reply to Nitin Sakhuja
    TI__Genius 12541 points
    Hi Nitjin,

    I see a partial answer there. Maybe I'm just not noticing the rest of it. I see the energy consumed over a range measurement is 19.3 mJ over 41.55 ms.

    I don't see how long it takes to wake up and prepare for the range measurement. I also still need the power consumed when in low power mode. We need to figure out if it's necessary to apply a load switch.

    Thanks,
    Darren
  • 0 in reply to Darren Jenkins
    TI__Genius 12541 points
    Hi Nitjin,

    Also, can you explain what are Test 1, Test 2 .... in that document?

    Thanks,
    Darren
  • 0 in reply to Darren Jenkins
    TI__Mastermind 25835 points

    Hello Darren,

     Test1 is start of the measurement cycle and Test 7 is completion of measurement cycle, 

    Between Test1 to Test 7 various activities would be carried out such as :

    MSP432 setting the functional (calibration, measure) mode and releases nRESET. 

    IWR1443 responds to mode; for functional mode, it loads the software from QSPI flash

    IWR1443 MSS software performs calibration and stores to QSPI flash, or reads QSPI flash.

    IWR1443 MSS software sends MMWAVE commands and calibration to the RF BIST BSS processor.

    IWR1443 RF performs sensor measurement, ADC buffer has Rx data, and HWA converts to 1DFFT

    IWR1443 MSS processor performs averaging finds peak magnitude, and formats a message for SPI.

    IWR1443 MSS signals host interrupt and the MSP432 reads SPI message.

    MSP432 performs the shutdown mmWave sequence.

    Above various operations are conducted between Test 1 to Test 7 in 41msec time.

    For each of operation time taken and power consumed from 5V supply is logged and over all energy consumed is computed which results in 19.3 mJoules.

    Thanks and regards,

    CHETHAN KUMAR Y.B.