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CC1352P7: High PA not working on rfEchoTx example project

Matias Lao
Prodigy 50 points
Part Number: CC1352P7


Hi my name is Matias Lao, I'm currently using 2 LP-CC1352P7-4 and running the rfEcho example projects (Tx and Rx respectively).

I've modified the default custom RF Stack settings to use 'Custom PHY Setting, 2400 Mhz band' instead. The modified runs and shows the expected behavior on both Tx and Rx devices.

Next step was to use the high PA RF path to increase output power and extend the RF range.

However, after enabling the setting, compiling the code and programming the CC1352P7, the device stopped responding as expected. Neither the green nor red LEDs are blinking.

Is there any restriction for the configuration being used or any knwon issue?

Thanks in advance,

Matias

  • 0
    TI__Guru* 82431 points

    Hi Matias,

    What version of the SimpleLink SDK and and CCS are you using?

    If I understood correctly you did one test with the settings that you have posted in the screenshot without High PA, and it worked. When you check the High PA box it no longer works?

    Did you do a test where you check the High PA box and set "Tx Power" to a high PA value?

    Cheers,

    Marie H

  • 0 in reply to Marie H
    Prodigy 50 points

    Hi Mary H, your correctly understood my test setup. It worked without the High PA box checked (Tx power set to +5 dBm) and then when I checked the box it no longer worked.

    I'm using CCS v11.2.0.00007 and SimpleLink CC13xx CC26xx SDK v6.10.00.29.

    Even I check the High PA box, it does not allow me to set Tx Power to values higher than +5dBm.

    Best regards,

    Matias

  • 0 in reply to Matias Lao
    TI__Mastermind 25896 points

    Hi Matias,

    I have checked the CC1352P7-4 Packet TX example in SmartRF Studio, and I cannot tick the "Enable high power output PA" box. There must be indeed some sort of restriction at the moment, but let me come back back with more explanations.

    Best regards,

    Arthur

  • +1 in reply to Matias Lao
    TI__Mastermind 25896 points

    Hi again Matias.

    There is indeed an on-going issue with the LP-CC1352P7-4, which led us to momentarly disable the High output power PA radio settings. Please look at the SmartRF Studio 7 Revision History. Our team is currently working on it, but you will have to do without it, for now.

    Best regards,

    Arthur

  • 0 in reply to Arthur R☑️
    Prodigy 50 points

    Hi Arthur, thanks for your fast response.

    I've checked the SmartRF Studio 7 revision history. I've got some questions about the Bug Fix from version 2.25.0 copied below.

    • [CC1352P7] Fixed issue with the signals used to control the RF switch on LP_CC1352P7-2. This would lead to poor performance of the TX Output power when using High-PA (14 - 20 dBm) for the 2.4 GHz frequencies. (SRFSTUDIO-3291).

    First of all, I haven't found on TI site any reference to LP_CC1352P7-2. I've found (and have some units) from LP_CC1352P7-1 and LP_CC1352P7-4. Does this PN exist?

    Then, does this bug fix mean that it is possible to use the HighPA for the 2.4 GHz frequency on CC1352P7? If so, why is it not possible to use the highPA on the 2.4 GHz band for Propietary mode even the RF design is based on LP_CC1352P7-2 as shown below.

    Thanks in advance,

    Matias

  • 0 in reply to Matias Lao
    TI__Mastermind 25896 points

    Hi Matias,

    As of today, the LP_CC1352P7-2 is not available, so no existing PN is to be found. What you see here are merely preview settings. That also means it is not possible to use the highPA on the 2.4 GHz frequency band either.

    BR,

    Arthur

  • 0 in reply to Arthur R☑️
    Prodigy 50 points

    Understood.

    Thanks Arthur.

    Best regards,

    Matias