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TM4C1294NCPDT: Current limit on supply pins

Sergio Iannace
Intellectual 1520 points
Part Number: TM4C1294NCPDT

Hi team,

What is the current limit that is needed in order to protect the device on the supply pins?

Looking at datasheet, it looks like 1A. Can you please confirm this?

Thanks,

Sergio

  • 0
    Guru 117855 points

    Beyond the quest for 'current limit' ... insuring proper voltage levels (especially under 'transient voltage' arrivals),  voltage polarity - and conforming to the device's 'informed & advised' power pin treatments    (suitably located & valued/rated bypass & filter caps, primarily) deserves full/proper note & compliance!

  • 0
    TI__Guru 72500 points
    A supply capable of providing 1A at 3.3V is adequate to supply the part, however as CB1 points out, limiting the current is not how to protect the part. Making sure the voltage does not exceed the maximum specification (or go negative) is what protects the supply pins.
  • 0 in reply to Bob Crosby
    Guru 117855 points

    Thank you kindly, Bob.    Such thought 'jumped out' - glad to note & welcome your agreement.

    Note too - any attempt to (fully/properly) 'Current Limit the MCU' - would prove a (most) challenging undertaking!

    The 'Speed Required' by:

    • measurement
    • then recognition
    • and (then) 'reaction to'

    each/every (pending) 'over-current event'  ...  is likely to Cost MORE than the MCU.      (while adding greatly to the pcb's area & complexity.)             Not to ask ... how this - I KNOW!

    Prevention (via focus upon your/my cautions, advanced earlier) - rather than (any such) 'limiting' - proves a FAR more viable antidote to,  'any MCU suffered over-currents!'    (most always - if not always - FATAL to the MCU!)