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TM4C129CNCZAD: Hibernation Module Output Pin Drive Capability

Part Number: TM4C129CNCZAD


I would like to better understand the output drive capability of the _HIB pin associated with the Hibernation Module (TTL output).  Per the datasheet, it does not appear that we can control the drive capability of this pin like other GPIO.  Would the _HIB output more closely mimic the Slow GPIO pads with a fixed 2mA drive capability?  Your support is greatly appreciated!


  • Hello Jim,

    I am looking into this, I suspect it is a low current signal as it wouldn't make sense for it to need much current based on it's usage, but trying to find out more concrete information.

    Are you most interested in the current drive ability, or if it's a fast vs slow transition time?
  • Ralph,

    Thanks for the feedback - no worries about the transition time.  Per your comment above, I am most interested in the current drive ability of the _HIB pin.  Thanks!


  • In the event that such data recovery (may) prove obscure/delayed - would not the (temporary) placement of a resistive load - to (both) supply rails (one at a time) "tease out" such "_HIB's current drive capability?"    You may then compare/contrast _HIB's output versus  that of, "normal" GPIO outputs - set to "known"  current-output levels.

    Proves best to implement such test across several boards - seeking, "clustered" results.     (and avoiding dreaded, "Single Board Anomaly.")

  • Thanks for the feedback.  It is understood that this could be tested across a reasonable sample size.  That being said, I would still like to understand the pin's performance from a specification standpoint.

  • Thank you - my comment was issued as it (nears) the weekend - and the sought data is (somewhat) obscure.

    Agreed that for any (performance) spec - you require factory input. Your quest though - I believe would be well served - even via a "small sample." (especially as/if ... results converge/cluster...)
  • Hello Jim,

    I wasn't able to track down any such specifications, but it doesn't look like the pin was intended to really drive any sort of load. From lab tests along the lines of what cb1 has described, it looks like the current that the /HIB can drive is in the neighborhood of 100-200uA. So this is far lower than GPIO's that are capable of a few mA (and probably why specifications aren't to be found).
  • Ralph,

    Sounds good - thanks for the feedback!


  • It should be noted that poster's "self-award" of  "This post Resolved my Issue" proves, "Not the case!"    (his was a simple "confirmation" - no such  "Resolution" occurred w/in that post.)

    The post which suggested the "difficult & delayed nature" of such "data acquisition" - and which described the method to "Acquire such" - (directly leading to the resolution) sits now (improperly) "Unacknowledged & Resolution Free."