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CC1352P: Need Design Support

surya
Expert 2350 points
Part Number: CC1352P
Other Parts Discussed in Thread: CC1352R, CC-ANTENNA-DK2,

Dear Experts,

We thought to upgrade our cc1352r based device with cc1352-p1 for 20dbm here we have some doubts about Antenna design,

1. What is the use of SKY13317-373 RF switch is it for low power or what???

2. How to design custom board without PCB Antenna for dual band (SUB 1 and BLE), and for 20dbm.

regards

Surya

  • 0
    TI__Genius 15865 points

    Hi Surya,

    1. The RF switch provides isolation between the three RF paths, improving the RF performance. As 2.4 GHz is close to the 3rd harmonic of the 868 MHz band frequencies, energy can couple between the two paths if directly connected to the antenna input (i.e. harmonic leakage can degrade performance). Therefore, the switch is necessary for system performance and is strongly recommended to include in the design if more than one RF output is used.

    2. I would recommend looking at Section 5 of SWRA640 (CC13xx/CC26xx Hardware Configuration and PCB Design Considerations): https://www.ti.com/lit/swra640 and also SWRA161 (AN058 – Antenna Selection Guide): https://www.ti.com/lit/swra161 for information on how to use different antenna designs (including different antenna types).

    What are your doubts about the antenna design? It has been extensively tested, sucessfully used in many customer designs, and its performance (including measurement data) is documented in the App Note SWRA161 (linked above).

    Regards,

    Zack

  • 0 in reply to ZC
    Expert 2350 points

    Hi ZC,

    Sorry for the late reply,
    we can't use the PCB antenna here, then how can i use single external antenna for BLE and RF.

    we would like to design separate antenna such as PCB antenna for BLE and external antenna for RF so that i am asking the question about switching..., we always like to use Power amplifier(20dBm) so please let me know what we will do.

    also please let me know if there is an problem to use RF and BLE on same time then how can i test rfDualModeRx/Tx  and rfUARTBridge example codes... 

    regards

    Surya

  • 0 in reply to surya
    TI__Genius 15865 points

    Hi Surya,

    https://www.ti.com/tool/CC-ANTENNA-DK2 has a dual-band chip antenna recommended by Fractus Antennas. Please see Design #3 (Section 2.1.3) of

    SWRA476 (CC-Antenna-DK2 and Antenna Measurements Summary): https://www.ti.com/lit/swra496

    If using a dual-band antenna, you will need to use an RF switch between the RF paths and the antenna path as explained in point 1 of my initial reply.

    If you are using separate antennas for Sub-1 GHz and 2.4 GHz, then you will need a switch for the Sub-1 GHz, +14 dBm port and the +20 dBm port, but not for the +5 dBm, 2.4 GHz port (as the +5 dBm, 2.4 GHz path will be routed to a separate antenna).

    It is always recommended to include a Pi-filter in the antenna section (after the RF matching) to allow for additional tuning of the antenna to improve the performance (as recommended in SWRA161 linked above). You can refer to SWRA476 and SWRA161 for information on antenna selection depending on your requirements.

    The CC1352P is capable of transmitting or receiving at a single band, in TX or RX, at any given time - full duplex operation is not possible.

    Regards,

    Zack

  • 0 in reply to ZC
    Expert 2350 points

    Hi Zack,


    Thanks for the detailed explanation, the below image shows CC1352-P1 Antenna Design 

    Here i thought to design PCB antenna for 2.4GHZ and use the below antenna for sub1 GHZ 20dbm only, so i don't want to use the antenna design which is connected with SUB-1_GHZ_RF_P and SUB-1_GHZ_RF_N pins(pin 3&4), 

    W1063M - Pulse Electronics - Antenna, Swivel, 868 MHz to 928 MHz (element14.com)

    so i going to use TX_20DBM_P,TX_20DBM_N to use the P13 UFL connector & 2_4_GHZ_RF_P,2_4_GHZ_RF_N  to avoid P11 UFL connector and add the PCB design after C492 capacitor...

    i hope RF switch is not required for my requirement what is your suggestion???

    is it possible to use UARTBridge example in my design???

    regards

    Surya 

  • 0 in reply to surya
    TI__Genius 15865 points

    Hi Surya,

    I am not 100% clear - what is the Sub-1 GHz, +14 dBm path connected to? You only mention TX for Sub-1 GHz (presumably you also need RX capability)?

    Regards,

    Zack

  • 0 in reply to ZC
    Expert 2350 points

    Hi ZC,

    The Launchpad design has been 2 different dBm designs like one for usual(max14dbm) another one is Power amplifier 20dbm, so that i want to use PA design only.

    regards

    Surya

  • 0 in reply to surya
    TI__Genius 15865 points

    Hi Surya,

    You still need to use the Sub-1 GHz port(s) for RX, as the +20 dBm Power Ampilifier is TX-only. Please see the functional block diagram of the CC1352P (the relevant paths are highlighted in yellow):

    Regards,

    Zack