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Questions about impedance matching and programming pins for CC2650

Fu Luo
Intellectual 440 points
Other Parts Discussed in Thread: CC2650

Hi There

I have two more questions regarding to CC2650 design. Please help me out. I am a fresh system design engineer.

1. The trace length from CC2650 to Balun ( LFB182G45BG5D920 ) is 3mm in my design. Is this short enough ?

2. What pins are needed to be able to program CC2650 ?

    The pins are available in my design are: 

    JTAG_TCKC

    JTAG_TMSC

    NRESET

    DIO_2, 5, 6, 13, 14.

    VCC

    GND

    I am looking forward to hearing from you. 

    Thanks a lot.

    Best regards

    Fu 

  • 0
    TI__Guru** 106705 points
    Hi Fu,

    1) 3 mm sound ok.
    2) You need the JTAG pins, reset, VDD and GND. For the JTAG pins: If you are using XDS100v3 or XDS200 you only need TCK and TMS, if you are using XDS110, JLink, etc. you need TCK, TMS, TDI and TDO.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Intellectual 440 points

    Hi  Fredrik

    Thank you very much for your quick response.

    I have some follow-up questions here.

    1. Right now, I am using CC2650  size: 5x5 for my custom board .  The testing interface of my design has pins as below :

        JTAG_TCKC

        JTAG_TMSC

        NRESET

        DIO_2, 5, 6, 13, 14.

        VCC

        GND

        Can I use "SimpleLink SensorTag Debugger DevPack for new SensorTag (CC2650) " to debug my custom board ?

    Base on your previous email, it seems I can use JTAG_TCKC , JTAG_TMSC, NRESET , VCC and GND to connect with SimpleLink SensorTag Debugger DevPack. Then, I can perform debugging, is my understanding right?

    2.  If I want to use TDI and TDO for debugging purpose, can I use DIO_5 as JTAG_TDO and DIO_6 as JTAG_TDI ?

    I am looking forward to hearing from you. 

    Thank you very much. 

    Best regards

    Fu Luo-Larson

  • 0 in reply to Fu Luo
    TI__Guru** 106705 points
    The TDI/TDO mapping for the various CC26xx packages is found in the IO chapter in the technical reference manual.

    The DevPack Debug is an XDS110 and requires all 4 JTAG signals.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Intellectual 440 points

    Hi Fredrik 

    Thank you very much for your help.

    Best

    Fu

  • 0 in reply to Fu Luo
    Prodigy 90 points

    Hello,


    is it possible to change the original mapping of the TDO and TDI Pins (DIO16/17@7x7) to other DIOs?


    Greetings

  • 0 in reply to Marcus Fischer
    TI__Mastermind 18780 points

    These are unfortunately fixed.