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TPS659038 POWERHOLD pin

David Emery
Prodigy 60 points
 I’d like to choose an input of TPS659038 that allows a logic level (say “1”) to turn on the OMAP5432 and a logic level (say “0”) to turn off the OMAP.
 
 The POWERHOLD pin is my best guess at being the input that does this.
 
 SWCS095 the TPS659038 Data Manual doesn’t give a complete description of this pin.
 
 So I need to know how this POWERHOLD pin functions?  And whether it would be the correct pin to use to turn on and off the OMAP?
  • 0
    TI__Expert 7240 points

    Hello David,

    As this device falls under our Mixed Signal Automotive product line, I've moved it to the Automotive E2E forum.

    To answer your question, there are a few different methods you can use to turn on and off the TPS659038, which in turn will turn on and off the OMAP.  Table 4-1 in the TPS659038 Data Manual describes the events that can be used as ON requests including the POWERHOLD pin.  Actually, the POWERHOLD pin is often what we suggest to customers to use as the enable/disable signal for the TPS659038.  It's as simple as you describe.  A HIGH signal on the POWERHOLD pin will enable the TPS659038 and a low signal will disable it.

    Please let me know if you have any additional questions. 

  • 0 in reply to Ben Hopf
    Prodigy 60 points

    Hi Ben,

    Thanks for your reply.

    If  the POWERHOLD pin is permanently connected high, will the TPS659038 and OMAP transition to ON state (i.e. see the ON request) as soon as power is applied to the board?

    If the POWERHOLD pin transitions low will the TPS659038 remove power from the OMAP immediately or will  the OMAP go through a power down sequence?

    Thanks,

    Dave

  • 0 in reply to David Emery
    TI__Expert 7240 points

    Hi David,

    As long as there are no gating conditions (RESET_IN, POWERDOWN, etc.) then yes, the part will automatically transition to the ACTIVE state once power is applied.

    If the POWERHOLD pin transitions low, the TPS659038 will execute the power down sequence to remove power from the OMAP.