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DRV8308EVM gui

Kenneth Tait
Intellectual 290 points
Other Parts Discussed in Thread: DRV8308, CSD18532Q5B

I just got a DRV8308 EVM. installed the gui composer and app, starts ok but will not see the com port the EVM is on. It is com20, it insists on connecting to com10 and com20 will not show up in drop down list.

This sits in an endless loop flagging errors and will not shut up.. Who wrote this crap? Why am I wasting my time with the simple stuff..

What's the problem..don't tell me windows, it is fine and so is the port.

Ken

  • 0
    TI__Guru** 114905 points
    Hi Ken,

    Sorry to hear of your problem.

    What errors are being flagged?

    Can you provide a screenshot of the GUI once it opens and is sitting.
  • 0 in reply to Rick Duncan
    Intellectual 290 points

    Rick

    Thanks for replying.

    I found the solution. The problem seems to be the installer. When it put in the FTDI drivers, Device manager sees it fine and flags it as com20. When I drill down on the properties, drop down says it is com19?? How is this even possible? At the least the gui port scanner should have seen the com20 unless it's longer for something else.. It also sets the buffers to max size..which is not right if your control protocol is small.

    changed it out, now it sees the board, however when I wire it up exactly as the EVM manual..motor does not spin. just sits there drawing 30ma on 24V when enabled?

    nothing broken, no fault lights.....

    I see on other posts that the motor shipped is not the orginal, this one from Anaheim automation?? If true and I look at their color codes, there seems to be some discrepancies here. Are you sure this wiring is correct? They say these are open collector halls, so jumpers in manual should be ok...

    What else to check?

    Ken

  • 0 in reply to Kenneth Tait
    TI__Guru** 114905 points
    Hi Ken,

    Can you provide the model number of the motor? The Anaheim Automation motor should be similar to the TelcoMotion DT4260-24-055-04H-TI motor shown in the user guide. We would have to check the color codes.
  • 0 in reply to Rick Duncan
    Intellectual 290 points
    Rick,
    The motor is marked with this number except no dash. DT4260-24-05504H-TI if that is a clue?

    I was looking at the Anaheim data sheet since Telco won't give one out. Someone on the forums said these are the same motor, but this has not been verified as far as I can see.

    After killing the gui and restarting it 4 times. it magically started to work, motor spins. My only conclusion here is that something got locked in the setup or the msp was not really listening?? Some protocol bug?

    At least we are making progress.

    One other question while I have you. We are planning on using 25A fets with this since we need this as a max drive. My local Ti FAE sent me a few part numbers to try here. I know we can't add external drivers to this. Do you see any problems with this and are you planning a new version of this part that can take external drivers? We typically need 2.0A of drive....

    Thanks
    Ken
  • 0 in reply to Kenneth Tait
    TI__Guru** 114905 points

    Hi Ken,

    The motor datasheet is located in the Hardware: DRV8308EVM zip file. This can be found in the DRV8308EVM folder.

    Have you read the blogs HERE and HERE?

    What is the target rise/fall time of the FETs? What FETs are you considering?

    There is no plan for a new version that can take external drivers.

  • 0 in reply to Rick Duncan
    Intellectual 290 points
    Yes I have looked at most of the app notes, not in great detail so I will re-read them

    we were looking at this FET
    www.ti.com/.../CSD19502Q5B

    Seems to fit the bill...
    Ken
  • 0 in reply to Kenneth Tait
    TI__Guru** 114905 points

    Hi Ken,

    The app note referred to in the blog links will help you determine if using IDRIVE and TDRIVE meets your needs.

    The FET that you are considering has higher charge than the CSD18532Q5B in the app note.

  • 0 in reply to Rick Duncan
    Intellectual 290 points

    Rick

    I have reviewed all the docs. This part still may have some use  for us. I need to drive the FETs with a maximum voltage of 60V. Normally a 48V supply to motors but in this app, a charger can be connected so the driver will see 60V max.

    The part has a 32V limit. I don't see any reason why I can't run the part on 12V and the FETs on a 60V supply.

    Any reason why this will not work?

    Ken

  • 0 in reply to Kenneth Tait
    TI__Guru** 114905 points
    Hi Ken,

    Yes there is a reason this will not work as you desire.

    With a 12V PVDD and the high side gate enabled, the voltage on the xHSG pin will be raised to ~22V (the VOUTH voltage). This will not create the 48V desired on the motor phase. At best you may see ~20V on the phase.