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UCD9090 Connection Issue

Ian Miller1
Prodigy 30 points
Other Parts Discussed in Thread: UCD9090

Every time I try to connect to my UCD9090, I get the message:

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An error occured while trying to detect a PMBus device. The error was:

Failed to create device UCD9090 object at address 65: The NUM_PAGES command was NACKed by the device; can not continue configuring the attached device as a UCD9090 at TIDP.PMBus.PMBusDevice.l(ah A_0, IEnumerable`1 A_1, an A_2) at TIDP.PMBus.PMBusDevice.l(aj A_0) at TIDP.PMBus.WinForms.Forms.a.nu()

Please check your device firmware, power, and USB connection.

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I have not been able to find any documentation on the reason for this error.  Does anyone know of a reason for this error?

Some information that may be helpful:

  • I was able to connect twice at the beginning, then it stopped working.
  • I programmed it to be in brownout mode.


After some further investigation, I only seem to have this issue when powering the UCD9090 from a power supply on the board (~3.2V).  When I power it from the USB-TO-GPIO and the board is not powered, I am able to connect ok.

  • 0
    TI__Genius 9490 points

    To verify if I understand it correctly: if you power the device using the USB-To-GPIO Adapter, then you don't have any issue; If you power the device using external power supply, then you have the issue.

    Are you using the TI EVM board? If yes, the power supply is connected to J1 (DC Jack Input) or J5 (DC Screw Terminal Input)? If you power the device using either J1 or J5, please make sure that you provide a 5V (4-6V) power.

  • 0 in reply to Anne Ngo77
    Prodigy 30 points

    Yes that is correct.   I determined the cause of this issue late yesterday, the external supply was not referenced to ground so it was being grounded through the USB-TO-GPIO ground.  Once I tied the external power supply ground to the PC ground, I was able to connect.