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IWRL6432BOOST: Power Consumption Calculation for IWRL6432 using Sensing Estimator Tool

Muhammad Zubair Ahmad
Prodigy 10 points
Part Number: IWRL6432BOOST

Tool/software:

Hi,

I have some confusion regarding how the mmWaveSensingEstimator version 2.5.0 calculates average power. I am attaching a picture for reference. As can be seen that the tool estimates the power to be 117.715 mW. While using the time and power settings if I calculate them my selves as follows:

Mode Time (us) Power (mW) Energry = Power x Time
Active Mode 6912 802.790 5548884.48
Interburst Idle 0 802.790 0
Processing 10000 77 770000
Interframe Idle 93088 0.660 54838.08
Total 100000 NA 6373722.56

Average Power =  Total Energy / Total Time = 6,373,722.56 / 100,000 = 63.74 mW


The mmWaveSensingEstimator version 2.5.0 tool calculates the power as 117.71 mW. My questions are as follows:

  1.  What is causing the discrepancy in two power calculations (i.e. one done manually and the other by the tool)?
  2.  How is idle time classified. Is it classified under active mode, interburst idle or interframe idle?
  3.  What is the interburst idle power consumption?
  4.  Is there documentation that I can refer too regarding the inner working of the mmWaveSensingEstimator version 2.5.0?

Thanks for your help in this regard.

  • 0
    TI__Genius 13126 points

    Hey Muhammad,

    Thanks for reaching out regarding Sensing Estimator and your own calculations! Please give me a day to breakdown the calculations. 

    Regards,

    Kristien

  • 0 in reply to Kristien Everett
    TI__Genius 13126 points

    Hey Muhammad,

    First and foremost, I would highly recommend reviewing the xWRL6432 Power App Note which includes a simplified equation for calculating the average power. 

    Muhammad Zubair Ahmad said:
     What is causing the discrepancy in two power calculations (i.e. one done manually and the other by the tool)?

    If you could share your configuration, I can double check the calculations here.

    Muhammad Zubair Ahmad said:
     How is idle time classified. Is it classified under active mode, interburst idle or interframe idle?

    What idle time are you referring to here or are you asking how its decided when we enter each idle state? The following table from the app note may answer your questions indirectly:

    Muhammad Zubair Ahmad said:
     What is the interburst idle power consumption?

    The interburst idle power consumption is 115.01 mW.

    Muhammad Zubair Ahmad said:
     Is there documentation that I can refer too regarding the inner working of the mmWaveSensingEstimator version 2.5.0?

    The power equations shared above is fundamentally how the Sensing Estimator calculates out the average power. To see the complete calculations, you can review the source code by importing the project from TI Gallery to GUI Composer. 

    Regards,

    Kristien

  • 0 in reply to Kristien Everett
    Prodigy 10 points

    Thank you for the response. I forgot to attach my configuration with the original question. It is attached below. 
    Moreover, can you point me to the resource where the power consumptions for interchirp idle and interframe idle are mentioned.

    /resized-image/__size/640x480/__key/communityserver-discussions-components-files/1023/8836.image-_2800_1_2900_.png


    The configuration is as follows
    Mimo = TDM
    Rx/Tx = 3/2
    Ramp End Time = 27 us
    Chirp Idle = 70us
    Number of Burst = 1
    Frame Periodicity = 100ms
    Number of Chirps = 256
    Accumulated Chirps per Tx = 0
    Burst Periodicity = 0
    Processing time = 10ms 

    Thanks

  • 0 in reply to Muhammad Zubair Ahmad
    TI__Genius 13126 points

    Hey Muhammad,

    The power numbers for interchirp idle and interframe idle are found within the source project under the TI Gallery. You will have to download or import the project to GUI Composer to view these numbers and the complete calculations.

    I will be out for the next week, so I have looped in another to look into the calculations here while I'm out. Please give them a day or two to look into this configuration.

    Regards,

    Kristien