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UCD9090: Fusion GUI and UCD90SEQ48EVM - Simple sequencing does not work

Tomas Gubek
Prodigy 20 points

I have bought UCD90SEQ48EVM evaluation module and installed Fusion Digital Power Designer 2.0.120 (BTW ver. 2.0.141 does not work on my Win 7: after 1 min. it is not possible to press "Write to Hardware" -> it is grayed even though I do changes).

After that I made a simple task. I want to sequence 2 LDOs with EN input and +5V outputs. I started with deleting all rails from 3 to 10 in 'Hardware Configuration' and let there stay only Rail 1 and 2 (Voltage is on MON1 and MON2 and Enable is on GPOI1 and GPIO2, respectively). In a 'Rail Config' tab I set +5V nominal voltage and Turn On Delay 250ms for both rails. On/Off Config is set to OPERATION only so I can switch it on/off when I give it a command (BTW it  took me a quite long time to find out how to assert OPERATION in Fusion GUI. I do it via 'All Config' tab and Write to Hardware -> not documented!!! I still cannot find how to assert PMBus CONTROL signal via Fusion GUI!). There is no dependency set. Project file is attached.

Here is the problem. When I send OPERATION command to EVM only GPIO1 LED lights on, GPIO2 is still deasserted. I cannot make it set so only first LDO is enabled.

What do I do wrong?

UCD9090 @ PMBus Address 101d - Sequencing-2rails-250ms.xml

  • 0
    TI__Genius 9845 points
    OPERATION and CONTROL pin can be controlled in Monitor section of the GUI (button is on the left side of GUI).

    OPERATION command only applies to one rail. When you are in Rail1 interface and send OPERATION, the GUI will send PAGE command to select Rail 1 and then send OPERATION to turn on Rail 1. You will need to switch to Rail2 (top-right corner drop-down list) then send OPERATION again for Rail 2.

    Or, you can configure CONTROL pin to control the rails. It applies to all rails.

    There is a System Dashboard button on the left side of the GUI in Monitor section. It will open all rails and you can send OPERATION without switching among rails using the drop-down list.