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TM4C1294NCPDT: Will a GPIO pin connected to ground get damaged if I accidentally configure it as output high?

Rakinya Pramod
Prodigy 10 points
Part Number: TM4C1294NCPDT

In the datasheet of  TM4C1294NCPDT it is acceptable to leave 'unused pins' as 'not connected'. The recommended standard is to 'connect it to the ground'.I would to like to avoid any situation where noise can be picked up. But there is a concern regarding damage to pins in case a different code is burned by mistake.

Will a GPIO pin connected to ground get damaged if I accidentally configure it as output high ?

Is there any protection inside against short circuit under such conditions?

Is configuring pins as GPIO input the best way for unused pins connected to the ground? 

 

  • 0
    TI__Guru 72500 points

    A GPIO pin configured as an output driving high MAY be damaged if connected to ground. There is no designed short circuit protection, although the absolute maximum rating for the GPIO pins (rating at which permanent damage may occur) is high at 64mA. If the concern is the wrong code being programmed into the part, using a current limiting resistor to ground would be a good compromise.

  • 0
    Guru 117855 points

    I agree w/the vendor's advice - but for the specification's (never) dealing w/the 'Duration of the offense!'    From long & extensive testing - the duration of the offense (must) be granted (some) consideration!    (and - as this proves difficult to quantify - it is 'Kicked to the Curb' - not always wisely!)

    I've another comment - by such (hard) Ground connections - you have almost insured that your pcb - will not be, 'Re-Usable.'    It is also reasonable (and most predictable) to ask, "What happens when (Not IF) you require one or two (additional) GPIO?   Locking those pins to ground makes such alteration unpleasant at best - even impossible!  (should the ground connection be 'beneath the MCU' (or another component.)

    At some point your accountants and/or investors will, 'Ask about Re-Usability' - and MCU pins (of such high value) which have been 'So chronically disabled' - doom 'Re-Usability' - and cause most investors/venture firms to flee!   

    Being able to 'tease out' an improvement, or modification, or to accommodate a new design - thru the use of an 'existing pcb' - proves a HUGE ADVANTAGE - one that is 'surrendered' - when multiple pins are 'removed from use!'   (for the most 'suspect' of reasons...)