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Original question:

CC1310: Internal capacitor array minimum configurable value

CC1312R: Internal capacitor array minimum configurable value (CC1312R)

franziskus
Expert 6776 points
Part Number: CC1312R

Team,

following up this thread, can you clarify what's the minimum configurable capacitance value for CC1312R with the capacitor array?

Thanks!

  • 0
    TI__Mastermind 27145 points
    Hi,

    Please refer to the following Wiki page. Cap-Array tuning Feature is also available in SmartRF Studio. Please check SmartRF Studio.

    processors.wiki.ti.com/.../CC13xx_CC26xx_Crystal_Tuning


    Thanks,
    PM
  • 0 in reply to PM
    TI__Guru**** 317180 points
    When the minimal value is used for the cap array setting the cap array is turned off and what you have left is parasitics which can be different from design to design dependent on the layout.

    PM: The wiki page is referred to in the original thread Franziskus points in the question.
  • 0 in reply to TER
    TI__Expert 6776 points

    TER, PM,
    thanks for your answers, but now I am confused:

    "When the minimal value is used for the cap array setting the cap array is turned off and what you have left is parasitics..."
    Is that line #1 in the wiki table?
    Are the 2.0 (pF?) only caused by parasitics?

    The answer to my other post says: "...it's not possible to turn off the array, only to turn it to a minimum."

    What's the capacitance value if the cap array delta is not applied? Such as:

    • #define SET_CCFG_MODE_CONF_XOSC_CAP_MOD              0x0        // Apply cap-array delta
    • //#define SET_CCFG_MODE_CONF_XOSC_CAP_MOD                 0x1        // Don't apply cap-array delta

    Can you confirm that the data on the wiki page is also true for CC1312R?
    (except that CC1312R only supports 48 MHz crystals.)

    Thanks!

  • 0 in reply to franziskus
    TI__Guru**** 317180 points
    - The table in the wiki covers both CC13x0 and CC13x2, please read the header for the columns in the table
    - Note that in the table the cap array is not set to a minimum meaning that the cap value is given by the cap array and the parasitics. Just the parasitics are estimated to be in the 1.0 - 1.5 pF range.
    - The correct is that the array is off with the minimum value. I had the wrong information when I wrote that it was not possible to turn off.
    - If the cap array is not applied you will get the value with the cap array setting equal to '0' in the table.