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UCD9224: Unable to detect UCD9224 in the Digita Fusion GUI

Fuad Hanin
Prodigy 50 points
Part Number: UCD9224

Hi Experts.

I need your help with my UCD9224 chip; my problem is inability of Digital Fusion Power GUI to detect the presence of the chip despite 3.3V is supplied to all the pins via the internal regulator and also backup with additional 3.3V from PMBus header pin 5.

I followed all the procedures and sequences; but yet the system cannot be scanned.

Is this related to software and what is the proper procedure and methodology?

I am using 2.2k pullup resistors for DATA,CLK. CNTL & ALERT ; the same as the evaluation module design?

Please help me in this. 

  • 0
    TI__Genius 9845 points

    Please download Fusion Digital Power Designer GUI from the web page below:

    Please make sure the Fusion GUI can detect USB adapter.

    Please make sure each PMBus slave device has a unique address. You can disable all other PMBus slaves to isolate the problem. 

    Please make sure PMBus signal logic levels are correct. The USB adapter has programmable internal pull-up resistors. You may want to disable the internal resistors or set to a high value.

    Please make sure the reset pin is pulled to 3.3V and has a local decoupling cap. 

    Please make sure the 3.3V supply is stable. 

  • 0 in reply to Zhiyuan Hu
    Prodigy 50 points

    The USB adapter is detected.

    100kohms were used for ADDR00&01 ; so the address will be 78 but no detection so far.

    I am using 2.2kohm pullup resistor for PMBus signals.

    12V is stepped down to 3.3 using the builtin regulator and used to power UCD9224 chip.

    The reset pin is also pulled up to 3.3V as mentioned.

    Please see attached schematics for your review.

    What else could go wrong?Schematic MPPT Converterless Controller Rev03.pdf

  • 0 in reply to Fuad Hanin
    TI__Genius 9845 points

    Reset pin has no decoupling cap. Add a cap and see if it solves the problem.

    Make sure the LED in the adapter is lit. If not, unplug the USB and plug again.

    In the GUI, you can configure the USB adapter, and disable internal pull-up resistors.

    Check if 3.3V is stable.

  • 0 in reply to Zhiyuan Hu
    Prodigy 50 points

    Thanks for your response.

    The 3.3V supply readily has decoup capacitor and its stable supply.

    According to the datasheet of UCD9224, the sample drawings indicate the reset button connected to ground (LOW Logic) while the specification part states that we have to connect it to 3.3V via pull up resistor; please advise which one is correct?

  • 0 in reply to Fuad Hanin
    TI__Genius 9845 points
    RESET should be pulled up to 3.3V with a local decoupling cap.
  • 0 in reply to Zhiyuan Hu
    Prodigy 50 points
    Tried that ... but no detection yet.

    I don't know what is causing the miscommunication between UCD9224 and USB Adapter ?
  • 0 in reply to Fuad Hanin
    TI__Genius 9845 points

    Is there another PMBus master in addition to the USB adapter? If so, please disable it when you connect the USB adapter to the bus.

    Are there other PMBus slaves? If so, please disable them for the time being.

    If above steps are not successful, go to Start=>=>Texas Instruments=>Fusion Digital Power Designer=>Device GUIs=>UCD3xxx and UCD9xxx Device GUI.

    Click scan DEVICE_ID, see if you can find the UCD9224. If not, click scan in ROM mode, see if you can find the device.

  • 0 in reply to Zhiyuan Hu
    Prodigy 50 points
    The problem is that the device cannot be detected even in ROM mode; is there a certain problem to this one?
  • 0 in reply to Fuad Hanin
    TI__Genius 9845 points

    In that case, either communication has a problem (you can check communication waveform of PMBus pins), or the device is not functioning due to damage or other reasons.