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UCD90120A: Ramp down all supplies if one supply has a fault

Abhijit Khadilkar
Intellectual 265 points
Part Number: UCD90120A

Hello Experts,

UCD90120A xml file project is attached.I want to ramp down all supplies from Rail 1 to Rail 11 if pin 42 GPI3 is pulled low. What setting is needed in the attached file? Please help.

thanks, AbhijitUCD90120A @ PMBus Address 65d Project.xml

  • 0
    TI__Expert 3970 points

    Hey Abhijit, 

    Our subject matter expert is out of town and will get back to you next week. 

    Thank you, 

    Dhanya Prem

  • 0
    TI__Expert 5470 points

    Hey Abhijit, 

    You can use "Pin-Selected-Rail-States (PSRS) to ramp down Rail 1 to Rail 11 whenever GPI3 (pin 42) is low:

    • Set Rail 1 to Rail 11's ON_OFF_CONFIG (02h)  to use OPERATION command.
    • Set GPI3 polarity to "Active High".
    • Configure PSRS to turn R1 to R11 on when GPI3 is asserted, and turn off R1 to R11 when GPI3 is de-asserted. R12's ON_OFF_CONFIG is set to "Always" => GPIs states will not affect R12.

    NOTE that R1 to R11 will be turned on whenever GPI3 is asserted, or OPERATION (01h) command sent to command the rail on.

    Anne Ngo

    Texas Instruments