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Xilinx AC701 evaluation board PMBus control of UCD90120 VCCO_VADJ

Robert Curtis
Intellectual 430 points
Other Parts Discussed in Thread: UCD90120

Does anyone have  an example of the PMBus command sequence needed to change VCCO_VADJ on the Xilinx AC701 evaluation board from 2.5V to 3.3V?  I am using the ARTIX FPGA PMBus interface to the UCD90120 controller to make the changes and am coding in VHDL, will not be able to do this using TI FUSION SW.

I need to change the monitor voltage on pin 1, and the GPIO signals 17 and 18.  Its not clear if I need to change GPIO15 (VADJ_TRIM).

Thanks for any help,


Rob Curtis

  • 0
    TI__Genius 9845 points
    You will need to change several parameters such as Vout_command, Vout_OV_fault_limit, etc. For changing GPIO configuration, you will need GPO_CONFIG_INDEX, GPO_CONFIG and GPI_CONFIG.

    UCD90xxx PMBus Command Reference contains mostly manufacturer specific commands.
    www.ti.com/.../slvu352c.pdf
    There are also many standard PMBus commands described in PMBus Specification Rev 1.1.
    pmbus.org/.../OlderSpecifications

    Another tip is to use Fusion GUI in offline mode. You can make changes and click "Write to Hardware" even if there is no hardware. The PMBus commands associated with the changes will be displayed in PMBus Log window on the lower-right corner of the GUI. Once you know what commands to look up, you can refer to above reference manuals for further reading.

    Regards,
    Zhiyuan