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UCD90124/UCD90124A - How to Configure via Fusion to Use GPI to Initiate Sequence On/Sequence Off

John Morton
Prodigy 150 points
Other Parts Discussed in Thread: UCD90124

Hello,

  I would like to be able to use a toggle switch connected to a spare GPI in my UCD90124/A application to be able to initiate a sequence up or sequence down operation. This would behave like a master power switch. I'm using Fusion 1.8.157. I'm having a difficult time figuring out the proper sequence of actions within Fusion to set this up such that my first rail is sequenced on or off by a GPI. I would appreciate any pointers or advice anyone in the E2E community can offer.

Thanks,

John M.

  • 0
    TI__Mastermind 42795 points

    The CNTRL pin can be used as the master GPI to sequence ON/OFF any rail with the respective ON/OFF control set for CONTROL pin operation. Other GPI designated pins could be used for ON/OFF control when using the pin selected states feature.

  • 0 in reply to Eric Wright
    Prodigy 150 points

    Thanks Eric. I think I was able to set it up in Fusion for the pin selected states feature. I do have a follow-up question. In Fusion in the Vout Config tab, both the GPI Sequence On Dependencies and the GPI Sequence Off Dependencies have "Pin 32 Active". I'm assuming "active" means "asserted", high if active high, e.g. How do I get the GPI Sequence Off Dependency to show "Pin 32 Inactive"?

    This is the behavior I would like since I'll be connecting a toggle switch to the GPI.

    -JM

  • 0 in reply to John Morton
    TI__Mastermind 42795 points

    GPI polarity can be selected on the pin assignment tab of the form (active high or active low). Then on the Vout Config form the GPI can be selected or used as a sequence ON or OFF dependency if "checked" or selected. When selected, the pin would be "active" meaning that the active polarity chosen would be used. Remember that choosing the GPI for sequence ON or OFF dependency doesn't mean that the GPI can be toggled to turn that rail ON or OFF. The state of the GPI would only be evaluated at sequence ON or OFF time and no other time.

  • 0 in reply to Eric Wright
    Prodigy 150 points

    Hello Eric,

      Thanks - I think I'm closer to having this figured out but not quite there. If I set the On/Off Control to "None" , set Turn On Delay to 0, and have the GPI as the only Sequence On Dependency, won't that have the effect of having the GPI control the sequencing On of the rail?

      Please let me know if you think the following is plausible. As mentioned earlier, I would like to use a toggle switch (along with an RC circuit for debounce) on a GPI to use to initiate a power on sequence and a power off sequence. Here are the actions I would take:

      1) Connect the toggle switch circuit to two GPIs (pins 41 and 42, e.g.), set one to be active high and the other to be active low

      2) On the first rail to sequence On and the first rail to sequence Off, set the On/Off Control to None and Turn On/Off Delay to 0. No rail sequence On/Off dependencies

      3) For the first rail to sequence On when Toggle switch thrown, set GPI dependency to pin 41 GPI active high

      4) For the first rail to sequence Off when Toggle switch returned to original position, set GPI dependency to pin 42 GPI active low

      Look forward to your reply.

    -John M.