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TM4C123G LaunchPad Schematic

Alejandro Ortiz
Prodigy 20 points
Other Parts Discussed in Thread: TM4C123GH6PM

I want to design my own pcb board with the TM4C123GH6PM MCU. So I took a look at the (link) pdf and saw the schematic on page 19. However I have no clue what +MCU_PWR stands for its shown twice in the power management circuit and in the In Circuit Debug Interface.

so what do these mean are they inputs or output pins?

Thanks, Alex

  • 0
    Guru 26105 points

    Hi,

    Neither one, they are power pins; depends on your tools, most tools after 1998 should have this kind of connections, but be careful, since some tools design both + and gnd as power tools.

    Petrei

  • 0
    Guru 47900 points

    Based upon your question - and your very first post - may I suggest that you'll (likely) do much better to "delay" your pcb design until you've gathered more experience with the LPad?

    If your learning curve follows normal trajectories - that board design will undergo multiple changes - as your understanding shifts & expands.

    If you simply must, "spin a board" - would not a simple, "plug in" focused expansion of the LPad prove best?   (and far easier)

    You may wish to:

    a) organize several serial ports - so that power & signal may "fit" on single cable
    b) add (the missing) RS232/485 line drivers (for sure)
    c) add (equally missing - yet not so desired) UART to USB, or CAN Xcvr
    d) organize the pins so that an 8 bit port - with strobes - appears. (such ideal for connecting to text Lcd)
    e) install 4 pots, several switches & Leds- so that you may test & exercise the MCU's ADC & GPIO

    Our firm has past produced such boards - our interns/new hires benefit greatly thru use of these "known good" teaching aids... (not so much from "junk bin specials" cobbled together - which too often frustrate/confound/delay...)

  • 0 in reply to cb1
    Prodigy 20 points
    Thanks for the input. But even if I dont't end up making the pcb board what does the +MCU_PWR stand for?
  • 0 in reply to Alejandro Ortiz
    TI__Guru**** 244400 points
    Hello Alejandro,

    From Page 12 of the User Guide:

    To measure the Hibernation mode current or the Run mode current, the VDD jumper that connects the 3.3
    V pin and the MCU_PWR pin must be removed. See the complete schematics (appended to this
    document) for details on these pins and component locations. An ammeter should then be placed
    between the 3.3 V pin and the MCU_PWR pin to measure IDD (or IHIB_VDD3ON). The TM4C123GH6PM
    microcontroller uses VDD as its power source during VDD3ON Hibernation mode, so IDD is the Hibernation
    mode (VDD3ON mode) current. This measurement can also be taken during Run mode, which measures
    IDD the microcontroller running current.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Guru 117855 points

    May I add to Amit's fine & detailed posting that you further boost your understanding by consulting multiple, similar, MCU eval board schematics.

    The circuit detail Amit's exposed is, "far beyond" the needs and/or "normal requirements" of the majority of MCU board designs.   (my firm has produced several hundred such boards - rarely have we provided such, "special - power interruption & probing - add on circuitry."     Such detail exists (only) for those truly interested in this vendor's vastly improved power reduction - when/if/as compared to a notorious, "battery devouring" past Cortex M3 - since retired...

    You must deliver adequate voltage & current to your board's MCU and all accessory components - always best to provide more current than "bare minimum" - that will surely catch you in the long-run...

  • 0 in reply to cb1_mobile
    TI__Guru**** 244400 points
    Hello cb1

    Thanks for the vote of confidence on the M4 line...

    Regards
    Amit