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adjust the UCD9248 rails on ZYNQ using PMBUS commands

Mohamad EL AHMAD
Prodigy 80 points
Other Parts Discussed in Thread: UCD9248

Hello Dears:

I bought a Zedboard (with Zynq). This board utilized 3 pcs of UCD9248.

i need help, I want to know how i can adjust the voltage on the rails of this pcs using the command of PMbus.

thanks

  • 0
    Prodigy 80 points

    Fusion Digital Designer can create a text file with the necessary PMBus commands.

    I wonder whether xilinx or the Zedboard vendor can provide you with the default configuration for the UCD's.

    A xilinx web page mentions a linux driver to access the UCD9248:
    https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/hwmon/ucd9200

    Do you want to do the access to the UCD's while running Linux do you run your own software?

    Andreas

  • 0 in reply to Andreas Doering
    Prodigy 80 points

    hello, 

    thanks for your answer

    i want to access to the UCD's while running Linux, that all for the exploration about power consumption of the system.

    Mohamad

  • 0
    TI__Genius 13700 points

    Yes, it is possible to adjust the output voltage of a rail controlled by the UCD9248 with PMBus commands, as long as the board provides access to the PMBus interface and they have not used the security command to block VOUT_COMMAND.

    Unfortunately, our PMBus tools do not support Linux, you will need to provide your own method to output PMBus commands to the controller.

    Here is the link to the UCD92xx PMBus command reference, it lists supported commands and details for manufacturer's specific commands:

    www.ti.com/lit/ug/sluu337/sluu337.pdf

    For details on standard commands, refer to the released PMBus Specification at www.pmbus.org , the UCD9248 supports version 1.1 of the PMBus Specification

     

  • 0 in reply to Brad
    Prodigy 80 points

    ok, great.

    in this state how i want to write any commands. what i want to use (interface?) or what is the needs for this UCD's access.