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IWR1443: The problem of IWR1443 on Power Optimization(TIDEP-0091)

Liu Hao
Intellectual 330 points
Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091

Hi all

Q1: 

1、  When I see the document of TIDEP-0091 “Power Optimization for IWR1443 77-GHz Level Transmitter Reference Design”, I really confuse about the full calibration and the partial calibration. Could you give me some details or documents about what’s calibration is disable on partial calibration

Q2: 

2、When I see the document of TIDEP-0091，the time of partial calibration is about 1ms, but in the test of GPIO_0, The calibration tims is 48.51ms,Does this is a full calibration? And the second IWR config time (I think this contain calibration time) is 11.08ms. Does this is a partial calibration?

 

Thanks

  • 0
    TI__Mastermind 25835 points

    Hello Liu Hao,

       Images in the above post did not appear correctly could you please post it once again? 

    Thanks and regards,

    CHETHAN KUMAR Y.B.

  • 0 in reply to CHETHAN KUMAR Y.B.
    Intellectual 330 points

    Hi CHETHAN 

    My whole question just as below

     

    Q1: 

    1、  When I see the document of TIDEP-0091 “Power Optimization for IWR1443 77-GHz Level Transmitter Reference Design”, I really confuse about the full calibration and the partial calibration. Could you give me some details or documents about what’s calibration is disable on partial calibration

    Q2: 

    2、When I see the document of TIDEP-0091，the time of partial calibration is about 1ms and the full calibration is 37ms. But it is not the same as the document(mmWave Radar Interface Control Document)

    I think the time of boot time calibration is 92ms totally.

     


     

    And also in the test of GPIO_0, The calibration tims is 48.51ms,Does this is a full calibration? And the second IWR config time (I think this contain calibration time) is 11.08ms. Does this is a partial calibration?

     

     

    Q3 :

    I Read the CCS code of "high_accuracy_14xx_mss", i find that  the project just do a whole RFInit calibration and also do the PERIODICITY calibration. Does my understand is right?

  • 0 in reply to Liu Hao
    TI__Mastermind 25835 points

    Hello,

       Thank you for sharing the images, It helps to understand your problem.

    1) Partial calibration refers to :  At factory sensor will perform full calibration and stores the calibration results in external QSPI flash interface. And when device wakes up it reads calibration values from the flash interface and applies to the sensor. This process is referred as partial calibration. As calibrations are loaded from the secondary storage media, time taken for the boot up and applying calibrations results to the sensor would be faster. In case of full calibration calibration values are measured fresh and applied to the sensor, hence this process takes longer time as compared to partial calibration. 

    2) Duration depends upon the sensor configuration and Use cases, for level sensing applications only one TX/RX could be used, hence calibration time changes accordingly. The number quoted is for the code developed for the TI design  TIDEP-0091.  All the calibrations need not be run, you could choose to disable some of the calibration for the boot time optimization, However APLL and Synthesizer calibrations cannot be disabled. 

    Also BSS firmware which does the calibration is also constantly evolving, for more accurate numbers please refer to interface control document for the calibration durations. 

    You may also refer to below "Self-Calibration in TI’s mmWave Radar Devices" app-note as well. 

    https://www.ti.com/lit/an/spracf4a/spracf4a.pdf 

    Yes, you are right, 48.51ms refers to the full calibration time. And configuration time includes the partial calibration and APIs that are issued from MSS processor (Chirp configuration ) to BSS processor and time taken for two processors interface for this communication.

    3) Yes, your understanding is correct. 

    Thanks and regards,

    CHETHAN KUMAR Y.B.

     

  • 0 in reply to CHETHAN KUMAR Y.B.
    Intellectual 330 points

    HI CHETHAN 

    Firstly， Thank you for your help

    And i also have a question ,  I use IWR1443 & MSP430 in a liquid level product. And the product  work for one second and then power off one second .

    just power on and power off constantly. The step is 1 second.

    And in the time of power on, the liquid level unit just measure one time.

    So i think i do not need to enable the periodic calibration. I just need enable the full calibration when it's RFinit. 

    Do my understand is right?

    Thanks

  • 0 in reply to Liu Hao
    TI__Guru 50240 points

    Hi Liu

    The TIDEP-0091 features a partial-calibration technique where the calibration matrix from a single full-calibration is stored in flash. It is then used on each measurement in order to save time that the sensor is powered on. Is this part clear?

    Regards,

    AG