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TM4C launch PAD hibernation function

yunsong sim
Intellectual 270 points


Hi everyone,

I am a hardware engineer and developing a logger with TM4C launch pad using hibernation function to reduce current consumption.

But, it hasn't been worked exactly. Software engineer designed it should be awakened every 10min.But this function didn't last long time I expected, even not one day.

So I decided to add some hardware stuff to help this function which would be using an external interrupt.

I will add a pulse detection circuit for this purpose. But I don't know how long the pulse should be last since this circuit can only make  a few nS pulse width.

Would you recommend what kind of point software engineer should look at?

Also, how long time the pulse width should last for interrupt input for being waken from hibernation state?

Thanks a lot.

  • 0
    TI__Guru**** 244440 points
    Hello Yunsong,

    The description is rather vague. Can you please provide the following information

    1. Which TM4C12x device part it is?
    2. What is the Hibernate mode being used: VDD3ON or VDD3OFF
    3. How is the VBAT supply laid out and schematic information.
    4. What do you mean that it does not work for a day? Does the battery drain out?

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Intellectual 270 points

    Hi Amit,

    1. TM4C123G. In fact, I use the EX-TM4C123GXL Launch pad.

    2. VDD3ON

    3.I don't use VBAT supply separately because I am using the launch-pad where VBAT and main 3.3V line are connected.

    4. There's no problem for battery drain issue because I don't use any independent battery like coins. I mean that the program(the launch pad) doesn't awaken from hibernation mode.

    There's nothing special in the schematic, I think. But if you need it, I will post later.

  • 0 in reply to yunsong sim
    TI__Guru**** 244440 points
    Hello Yunsong,

    Let me first make it clear. The launchpad are not qualified designs for production. So, if it is being used for prototype or Proof-of-Concept, then it is OK

    Coming to issue: If the issue is that it does not awaken every 10 minutes, then have the software team tried to reduce it to 5 seconds so that the wait time for the test is lesser.

    Also does it go into hibernate mode? When in hibernate the HIBn signal must go low.

    Regards
    Amit