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Original question:

TIDM-TM4C129POEAUDIO: Down during operation

TM4C1294KCPDT: TIDM-TM4C129POEAUDIO

LEE HYO GWAN
Prodigy 20 points
Part Number: TM4C1294KCPDT

Why is it sensitive to capacitor and resistance of 25MHz X-TAL?
For example, if 10pF X 2 units are installed, the operation for 30 minutes is changed to 22pF, and it will be down 1 minute after the call is connected.

  • 0
    TI__Guru**** 190406 points

    Hi,

      Please refer to the device datasheet in section "Main Oscillator Specifications" for detail. It explains how the C1 and C2 are calculated. There is also table listing part numbers of crystals that have been simulated and confirmed to operate within the specifications of the main oscillator input characteristics. The table includes the NX5032GA-25.000MHZLD-CD-1 crystal which is used in the reference design. Normally, customer should consult the vendor of the crystal supplier for the proper C1/C2 to use.