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AWR1843: APLL calibration

chianan chang
Intellectual 810 points
Part Number: AWR1843

Hi

    According TI's document about the APLL Calibration, I have some questions:

(1) When APLL start the period calibration? From BSS first time power on? or from MMwave_init()? or from sensorStart?

(2) Does the APLL period calibration is triger by BSS MCU itself? or MSS MCU? or DSS MCU? or Timer hardware triger?

(3) Document describe the APLL calibration can not be disabled by user and period is not user controllable, but is there any specially way I can tempory disable or delay the period?

(4) After sensor stop, does APLL calibration still excute with 1 second period? what kind of event or interrupt will triger BSS after sensor stop if MSS does not do any mmwave command after sensor stop? Periodly calibration/monitor? 

(5) Is there any way to reset BSS by MSS? if it can, after triger the BSS reset, does MSS still need to sync with BSS?

Sorry to ask so strange question, but I need to have some method to solve an issue that we have. Thanks

  • 0
    TI__Guru*** 149124 points

    Hi,

    Can you please give us more details about the background for this questions and the issues you have?

    chianan chang said:
    (1) When APLL start the period calibration? From BSS first time power on? or from MMwave_init()? or from sensorStart?

    The APLL calibration happens in two stages:

    • Initial Calibration at boot time - happens one time when RF_init command is sent to BSS
    • calibration at run time - triggered by temperature change
    chianan chang said:
    (2) Does the APLL period calibration is triger by BSS MCU itself? or MSS MCU? or DSS MCU? or Timer hardware triger?

    It is triggered by BSS

    chianan chang said:
    (3) Document describe the APLL calibration can not be disabled by user and period is not user controllable, but is there any specially way I can tempory disable or delay the period

    Please see more information about APLL calibration in the Radar Interface Control Document

    C:\ti\mmwave_dfp_01_02_06_03\docs\mmWave-Radar-Interface-Control.pdf

    chianan chang said:
    (4) After sensor stop, does APLL calibration still excute with 1 second period? what kind of event or interrupt will triger BSS after sensor stop if MSS does not do any mmwave command after sensor stop? Periodly calibration/monitor? 

    After sensor stop the run-time calibration does not run any more. It will start again after sensor start.

    chianan chang said:
    (5) Is there any way to reset BSS by MSS? if it can, after triger the BSS reset, does MSS still need to sync with BSS?

    No, there is no way to reset BSS. The BSS will always run after power up

    thank you

    Cesar