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CC1310: why 7*7 packaged chip can't receive 4*4 packaged chip RF data packets?

wei zhang
Prodigy 100 points
Part Number: CC1310

      I downloaded the latest CC1310 software development package. When I use it on my own board, I found that the 7*7 packaged chip could not receive the 4*4 packaged RF data package, but the two 7*7 packaged chips could send and receive RF data package from each other.

      I wonder what the reason is. Is there any restriction on the communication between the two packaged chips in the software development package?

      Thanks!

  • 0
    TI__Guru** 106705 points

    Hi Zhangwei,

    Most likely this is caused by frequency offset for one of your board designs caused by incorrect tuning of the 24 MHz oscillator.

    Are you able to communicate between the boards with SmartRF Studio (this will take SW out of the picture)? Can you measure the carrier frequency with a spectrum analyzer?

    See www.ti.com/lit/pdf/swra640 for details on crystal tuning.

    Regards,
    Fredrik

  • 0 in reply to Fredrik K
    Prodigy 100 points

        But when I used previous software development packages(SDK version before 2_10_00_36) and no changes have been made to my code and board, there is no problem with the communication between the two packaged chips.

        The central frequency point we use is 433.92MHz. Our Hardware Engineer measured the RF offset of two packaged boards. The result is that the deviation between the two is within 8.6KHz. He said it was normal.

  • 0 in reply to wei zhang
    TI__Guru** 106705 points

    Did you try SmartRF Studio between your boards?

    Is your SW otherwise running properly on the 4x4 boards?

  • 0 in reply to Fredrik K
    Prodigy 100 points

    I just tried SmartRF Studio. The two boards can communicate at a setting rate of 50Kbps. But our board uses a rate of 1.5MHz.

  • 0 in reply to wei zhang
    TI__Guru** 106705 points

    Hi Zhangwei,

    Since the boards can communicate fine with SmartRF Studio, there are no functional issues with the HW at least. 

    You did not answer my other question: Is your SW otherwise running properly on the 4x4 boards?

    Regards,
    Fredrik

  • 0 in reply to Fredrik K
    Prodigy 100 points

    Yes, my SW is running properly on my 4x4 board. 

  • 0 in reply to wei zhang
    TI__Guru** 106705 points

    I discussed this with a colleague, and it could actually be an issue with running 1.5 Mbps on the 4x4 QFN package. I am not sure where you have gotten the 1.5 Mbps settings from, but these have actually never been officially released from TI. As such, there may be issues related to using these settings.

    Can you try to use officially released settings from SmartRF Studio instead and see if that resolves your problems?  

  • 0 in reply to Fredrik K
    Prodigy 100 points

        The 1.5 Mbps setting code was sent to us by FAE after our company signed a confidentiality agreement with TI.

        The RF symbol rate setting on SmartRF Studio is too low to meet the needs of our company.