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DRV8334EVM: GVVD led status, fault status

Estuardo Castillo
Prodigy 10 points
Part Number: DRV8334EVM
Other Parts Discussed in Thread: DRV8334,

Tool/software:

Hello, I recently purchased the evaluation board for the DRV8334 chip and upon power up I noticed the fault led immediately turned on. I am powering the device with a 24V power supply with the current being limited to 300mA (as advised for first time turn on). The GVVD led is also off, which I find strange as I understand this voltage is generated on the board itself. I am curious on what steps can I follow to troubleshoot the device as I don't want to potentially damage any subcircuits. It is worth mentioning that I haven't changed the default connectors on J1, J6 and J7; that is, the buck regulator is powered on and supplying the 3.3V rail and the DRV8334 chip is receiving PVVD from PVVD_buck. Thanks in advance for any advice on troubleshooting. 

  • 0
    TI__Guru 63220 points

    Estuardo,

    Please check the DRV8334EVM User's Guide here: https://www.ti.com/lit/ug/slvucu7/slvucu7.pdf

    The EVM powers up in sleep mode, GVDD is powered down and nFAULT should be lit.

    The GUI is used to control the GPIO pins of the F280049C launchpad which takes nSLEEP high. 

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 10 points

    Hi Adam, thanks for your timely response. I did the setup for the GUI and downloaded TI's cloud agent for controlling the GPIO pins of the launchpad. However, I think I have narrowed down the problem to the communication of the GUI with the board itself as I am now checking the status of nSleep pin with my scope and no change is reported when toggling the slider on the GUI. The GUI reports no issues and simply says 'hardware connected' perhaps I am missing something with the installation itself but whenever I plug the board using the GUI it looks like the launchpad is being programmed (top blue LEDs flash) so I am not sure what the issue might be. I would appreciate some advice in setting up the GUI and perform some 'sanity checks' to check that it is communicating with the launchpad properly.
    Btw, I am using chrome for the GUI. Regards, 
    -Estuardo

  • 0 in reply to Estuardo Castillo
    TI__Guru 63220 points

    Estuardo,

    Can you take some pictures of your setup showing the EVM, launchpad, PC connection, power supplies, etc?

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 10 points

    Sure thing, I have some updates though. I tried to manually hook 3.3V from the launchpad to the nSleep pin and GVDD lits up and fault goes off, so I guess there's no issue with the board as of my understanding. I will attach pictures of the device working with this and the normal operation that I had trouble with. 

    No voltage is shown in the GUI. The power supply doesn't draw much current also, it is set to a 300mA limit for now but roughly consumes about 10mA

    And the 'manual setup'

    I guess I could drive the device using my own code but to be honest I'm quite unexperienced with CCS.

    I also detached the motor for now as it was simpler to troubleshoot without it. I guess that shouldn't be a problem for now as I am only trying to check the fault status. 

  • 0 in reply to Estuardo Castillo
    TI__Guru 63220 points

    Estuardo,

    Let me check on this with the team and I'll get back to you Monday.

    Regards,

    -Adam