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Use 3 Non-sequential Rails in UCD9244

Jonathan Salles
Prodigy 180 points
Other Parts Discussed in Thread: UCD9244

Hello.

Is there a way to use three non-sequential rails in the UCD9244?  i.e. use rail1, rail3, rail4 and leave rail 2 blank.  The reason is we fabbed our 66AKH12 design before we knew about the errata of the ARM VCORE and the DSP VCORE being tied together in the 66AKH12.  (despite being reviewed by TI).

If there is no way to not use a non-sequential set of rails, how to best disable rail2?  Set the voltages and currents to zero, set the power on to PMBUS command which it will not recieve?

Thanks

  • 0
    TI__Genius 13700 points

    Rail 2 will need to be configured, it cannot be skipped in the configuration but you are correct that setting the ON_OFF_CONFIG to OPERATION command and not issuing the command will keep the rail disabled.  Doesn't really matter how the remaining parameters are set as long as they do not result in a fault condition, i.e OVP.