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CC2642R: Single-Ended Operation With Antenna Diversity

Bhargav_i
Prodigy 170 points
Part Number: CC2642R
Other Parts Discussed in Thread: CC1310

Hi Team,

Please let us know, Is it possible to implement the PQT alogorithm on CC2642R, for antenna diversity?

If yes, do we need to use SPDT switch and take control of antenna Or we can use passive circuit for "Single-Ended Operation With Antenna Diversity" similar to that of CC13xx?

We are using CC2642 IC for our present application.

  • 0
    TI__Guru 56590 points
    Hello,
    Preamble quality threshold (PQT) is not really useful for BLE as there is only a single preamble byte which is to little energy and time to do antenna decision on a single packet.

    For more info refer to these threads as well:
    e2e.ti.com/.../2565034
    e2e.ti.com/.../690433
    e2e.ti.com/.../240386
  • 0 in reply to Eirik V
    Prodigy 170 points
    oh Thanks Eirik.

    We understand the fact that, for BLE : PQT alogorithm wont be much helpful.

    Also please clarify below points:
    Can CC2642 support the Antenna diversity function?
    According to the datasheet, we can use passive circuit for "Single-Ended Operation With Antenna Diversity" similar to that of CC13xx.
    If yes, does TI provide the sample code for Antenna diversity?
  • 0 in reply to Bhargav_i
    TI__Guru 56590 points
    Hello,
    Where in the DS is this information listed?
    I am not familiar with any antenna diversity in SW/SDK for CC2642R1F, at least not for BLE.

    Some older info here:
    e2e.ti.com/.../568755

    There is an app note that explain the antennad diversity for use on the CC13xx devices here:
    www.ti.com/.../swra523b.pdf
  • 0 in reply to Eirik V
    Prodigy 170 points

    Thanks for the details "e2e.ti.com/.../568755".

    As per the above link, it was suggested that "differntial output and RF switch" is recommended by TI, for antenna diversity.

    Please correct my understanding wiht respect to hardware,  The RF siwtch(DPDT) will be controlled by GPIO's. But how the differential data (RF N) & (RF P) from different antenna's will be handled by CC2642 chip. Generally (RF N) & (RF P) will carry data from one antenna(one source) and combined them. Please clarify, such that we can go ahead using "differntial output and RF switch" for antenna diversity.

  • 0 in reply to Bhargav_i
    TI__Guru 56590 points
    Which stack/protocol will be used? There is no support for BLE.
    The configuration in the app note was done on CC1310 and it use an external switch to switch between 2 different antennas so there is no internal switching on RF_N and RF_P.