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DK-TM4C129X and PAN1323EMK

Karel Gardas
Intellectual 285 points

Hello,

I do have one simple question with regarding to the new DK-TM4C129X. Is the 32kHz oscillator line connected to its EM connector too? If so, then am I right that PAN1323EMK may be used without soldering any third part oscillator to the board? Or if I'm wrong, is soldering of 32kHz oscillator still needed -- like in case of Booster Sensor XL board?

Thanks!
Karel

  • 0
    Guru 21435 points

    Hi Karel,

    This does not look to be the case, the 32KHz crystal looks to be a similar to the one that is on the Tiva C LaunchPad, that is used for hibernation mode, just a different brand. Also these crystals are called crystals, whereas the one that is required for the Booster Sensor XL board to get the PAN1323EMK to function correctly is called an oscillator.....not sure about the difference, whether this is technical or marketing?

    Here are the details, you can see they look very different, and have very different price points and specs.

    DK-TM4C129x Development Kit has this one - http://www.digikey.com.au/product-detail/en/CMR200T-32.768KDZYT/300-8736-1-ND/1679487

    Tiva C LaunchPad has this one - http://www.digikey.com.au/product-detail/en/AB26TRB-32.768KHZ-T/535-9033-1-ND/675581

    Booster Sensor XL Board requires this one - http://www.digikey.com.au/product-detail/en/ASVK-32.768KHZ-LJT/535-9545-1-ND/1237012

    I am not an expert on crystals, so it would be good to get clarification from TI regarding this. And also whether the PAN1323EMK will function with the DK-TM4C129x Development Kit, and if so, how?

    Glenn.

  • 0 in reply to Glenn Vassallo
    Intellectual 285 points

    Hi Glenn,

    indeed the crystal is mentioned only in case of "hibernation" support in the user manual. But on the other hand, if you look closely on the board picture you will see a jumper which is marked as "J23" and "EM_CLK" is below it which gives me a little bit hope that TI heart my plea for exactly this feature on LM4F232. Somewhere in the forum I've noted that populating this developer board with EM connectors and jumper for switching off the crystal when not needed would not cost them that much yet the board will be fully functional -- at least for us purely software developers...

    So let's see what some TI employee tells us about this new and exciting DK-TM4C129X board...

    Karel

  • 0 in reply to Karel Gardas
    TI__Intellectual 2790 points

    Hello Karel,

    Per the DS: "A buffered version of the 32.768-kHz signal Hibernate clock source is available on the RTCCLK
    signal output, which is muxed with a GPIO pin."

    This buffered 32K signal does indeed route to the EM1 connector(J19:  pin-5, RF_SLOW_CLK). This was, I believe, done for Bluetooth modules.

    The J23 jumper was added to allow the signal to be dedicated for this purpose and minimize noise. If jumpered, it routes to both the EM1 (J19) and the ULPI_USB (J27) pin-22. If the jumper is removed, it only routes to EM1.

    The DK-TM4C129X User's Guide does include a schematic. This buffered 32K output can followed via the signal names "32K" and "PC5".  You can find that here.