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Does CC8520 use Spread Spectrum?

RF_PTS
Prodigy 140 points

Other Parts Discussed in Thread: CC8520, CC2591

Hi,

Does the CC8520 use the Spread Spectrum technics?

Because as I saw on Configurator,  have 18 channel for use.

Thanks,

RF_pts

  • 0
    TI__Intellectual 1600 points

    Hello,

    The 8520 uses adaptive frequency hopping.  You can find a nice description in section 2.4.3 of the users guide

    http://www.ti.com/litv/pdf/swru250l

    Regards,

    BK

  • 0 in reply to BugKing
    TI__Mastermind 21125 points

    Also, remember that for certification purpose, FCC states that anything above 500kHz occupied bandwidth is spread spectrum. CC85xx has a occupied bandwidth of 3.8 MHz. 

    Regards, 
    Kjetil 

  • 0 in reply to Kjetil
    Prodigy 140 points

    Hi Kjetil,

    As we're talking now about certification purposes, can I use the Wireless Commander for frequency hopping simulation? How to do this?

    Best regards

    RF_pts

  • 0 in reply to RF_PTS
    TI__Mastermind 21125 points

    Hi RF_pts, 

    Yes you can. The Wireless Commander allow you to test all EHIF commands and RFT_NWKSIM is designed for your purpose. See the CC85xx User Guide appendix B for EHIF reference and the commander built in help system for usage. Using the built in script editor or the command and monitoring panel is probably the fastest way. 

    Regards, 
    Kjetil 

  • 0 in reply to Kjetil
    Prodigy 140 points

    Hi Kjetil,

    Thank you for your clarification. It´s very useful for me.

    Yes, I tested these procedure, works fine. Since I have only one CC debugger in my hands now, I couldn't check the tx signal, but I am monitoring the CC2591 PAEN pin using a scope.

    Maybe tomorrow I'll have the 2nd CC debugger, so I hope test the RX and TX.

    Could you clarify another issue? As shown on PPW Configurator, all 18 channels has a start freq and end freq. But these values don't match with the PPW Commander.
    Example: Channel 9 on PPW Commander use 2.442 GHz, but in PPW Configurator the range for change 9 is from 2.436 up to 2.440GHz. This happens also on channel 18 - I'm referring to prod_test_simplerf_tx configuration loaded in Product test screen of the PPWC Commander.

    Thank you.

    Regards,

    RF_pts

  • 0 in reply to RF_PTS
    TI__Mastermind 21125 points

    Hi RF_pts, 

    The PurePath Configurator have the correct frequencies and there seems to be an bug in the commander scripts. Some of the EHIF commands related to TX/Rx has finer grain adjustment than just channels (specifies direct frequencies instead) and assume that is where the errors where introduced. 

    Quick fix is just to edit these yourselves. They are .xml formatted files that can be found here:
    C:\Program Files (x86)\Texas Instruments\PurePath Wireless Commander\config

     Just to make it clear:


    Channel 1 2406 MHz
    Channel 2 2410 MHz
    Channel 3 2414 MHz
    Channel 4 2418 MHz
    Channel 5 2422 MHz
    Channel 6 2426 MHz
    Channel 7 2430 MHz
    Channel 8 2434MHz
    Channel 9 2438 MHz
    Channel 10 2442 MHz
    Channel 11 2446 MHz
    Channel 12 2450 MHz
    Channel 13 2454 MHz
    Channel 14 2458 MHz
    Channel 15 2462 MHz
    Channel 16 2466 MHz
    Channel 17 2470 MHz
    Channel 18 2474 MHz

    Regards,
    Kjetil 

  • 0 in reply to Kjetil
    Prodigy 140 points

    Hi Kjetil,

    Ok, now is clear for me. 

    Thank you.

    Best regards

    RF_PTS