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TM4C1230C3PM: TM4C1230

Damien Zhang
Intellectual 1175 points
Part Number: TM4C1230C3PM

Hi All,

In recent EMI test we found a high EMI at about 127MHz. The detailed information like below picture:

what's the reason about this phenomenon and how to resolve this problem.

thank you so much.

  • 0
    TI__Guru**** 184346 points
    Hi Damien,
    Your image is not viewable. Can you please upload the image again?

    I find this post which may be relevant to your observation. e2e.ti.com/.../538095
  • 0 in reply to Charles Tsai
    TI__Intellectual 1175 points

    i'm sorry and i have already post the picture again. please see the problem again. thank you.

  • 0 in reply to Damien Zhang
    TI__Guru**** 184346 points
    Hi,
    I need to brainstorm with others to interpret your result. In the meantime can you provide additional information about the system setup, i.e. what OSC and SYSCLK frequency and if you use your custom board for the EMC test.
  • 0 in reply to Charles Tsai
    Guru 117855 points

    Charles Tsai said:
    and if you use your custom board for the EMC test.

    Board layout along w/power distribution/routing - so often prove critical in such "EMI" evaluations.    Minus such data - nothing of consequence is likely to emerge from such request.     (Vendor's Charles may determine the likelihood of "custom" by noting if user's "4C1230C3 MCU" appears upon (any) factory eval board.)

    Yet - would not vendor published, "typical EMI test results" - across a variety of vendor produced boards - offer great insight & value?    (i.e. (some) knowledge beats NO knowledge!)

    It (would) be highly useful - both to requesting poster (& his client) - along w/so many here - if such EMI measurements could be performed upon (each) of the factory produced boards!     Such would - at minimum - provide a (greatly valuable/comforting) "EMI Baseline" - which would serve to, "Speed, Ease, Enhance" the comparison of "Custom boards" to "Factory Standards!"  

    In addition - the identification of such recommended EMI Test Conditions/Configurations - measurement equipment and/or standards - would lead to greater "uniformity" of such tests.

    Minus such "EMI standard" - are not ALL client-users - simply, "Shooting in the Dark?"    (and - is that the best - for all here?)

    Ideally - a "proper" EMI focused software routine - engaging individual MCU peripherals - and allowing different System Clock frequencies (thus providing great insight into the "potency" of different EMI generators) - would serve to yield a "reasonable" (apple to apple) EMI comparison...

    Might it be true that many/most such "Eval boards" emphasize "low cost" - and as such - EMI concerns/management were not "optimized?"    Even if true - especially if true - (some) Baseline trumps NO Baseline!