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Pandaboard / TWL6030 Power on button

Bharath R
Prodigy 40 points
Other Parts Discussed in Thread: TWL6030, TPS54320

I'm trying to add a momentary push button to power on and off a Pandaboard ES. PB_POWER_ON(J6 Pin 12) seems to be intended for this. I'd like to have the board boot up only when the button is pressed and not automatically(as is the default behaviour). How can I disable the current behaviour? Is there a jumper or resistor somewhere that controls this?

Looking at the TWL6030 datasheet, switch-on transition T3  is what  I'd like to control. Which of the triggers listed there is currently being used and how can I disable it?

  • 0
    TI__Expert 5515 points

    Raam,

    Here are the references to the Pandaboard schematics, maybe you can find something you can change, this is the beast place to look at: http://pandaboard.org/content/resources/references

  • 0 in reply to Israel Cepeda
    Prodigy 40 points

    Israel,

    Thanks for your assistance, but I'd already looked at the schematics before posting here. I realize this is not the official support channel for the Pandaboard, but similar questions in the mailing list as well as the IRC channel have been unanswered, hence I asked here.

    From the TWL6030 datasheet, Switch-on transistion T3 can be triggered by:

    1. Push button press and release(PWRON) [This ball is connected to a header pin. This is the trigger I want to use]

    2. Charging source plug [Charger related balls are all grounded or left floating]

    3. RTC Alarm

    4. Accessory plug(RPWRON) [This ball seems to just be connected to just a test point]

    5. Insertion of charged main battery or battery charge running

    6. Software reset

    7. USB ID plug insertion.

    Of the triggers listed above, it's either 3 or 5 based on my understanding. VBAT is permanently powered(by U22 TPS54320); does this count as trigger 5?

    Hopefully, for someone familiar with the PMIC, it'll only take a couple of minutes to look at the Pandaboard schematics to find which option is being used. However I fully understand if you or your colleagues do not have the time for this.

  • 0 in reply to Bharath R
    Intellectual 255 points

    Hi Bharath ,

       I have the same problem, Is there any  solution now ?  How to disable trigger 5 "Insertion of charged main battery or battery charge running" ?

    Tks & BRs

  • 0 in reply to Vincent Wu
    TI__Genius 10545 points

    The TWL6030 information is shared under NDA and that limits the amount of information that can be shared in public forums, that could be the reason why you should or would not find answers about it.

    The information you are looking for should be in TRM for TWL6030, there are too many boot modes, interrupt schemes to consider and the possible configurations to use that it requires access to it's TRM information plus access to the PandaBoard schematic to check current values, that should be the reason why access to schematic is mentioned in the first post.

    By searching in TI E2E forums for PWRON it was found 2 posts with some similar related information,

    http://e2e.ti.com/support/power_management/pmu/f/200/t/123851.aspx

    http://e2e.ti.com/support/power_management/pmu/f/200/t/205171.aspx?pi82589=2