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CCS locks up as soon as power applied to inverter

Vijay Earanky
Prodigy 100 points
Other Parts Discussed in Thread: TMDSCNCD28035ISO

Hi I am using Experimenter's Kit with F28035 DSP. The application is an inverter. I am using onboard USB JTAG Emulator. My problem is CCS loads the program and communicates with Kit but as soon as I apply power to the Inverter it hangs up and looses communication. I have to debug on line to set proper feedback values. Can someone help with this situation? Thanks in advance.

  • 0
    Guru 85685 points
    Hi Vijay,

    Post a schematic diagram or block diagram of your project, so we can I get an idea how your circuitry might affect the functionality of the Experimenter's Kit.

    - kel
  • 0
    TI__Guru 60865 points
    Hi Vijay,

    You may want to rule out any HW issues with your system. You can determine if the device is resetting by attaching a 'scope probe to the XRSn pin to observe if the pin toggles low when you apply power to the inverter. Another thing that may cause the device to lose connection would be a glitch on the clock input (if you are using an external clock source and not the internal 0-pin oscillators to clock the device), so you may also want to 'scope this pin as you apply power. Finally it may be a good idea to measure the device supply rails (VDD, VDDIO, and VDDA) with a DMM before and after applying power to see if the rails are within the DS operating spec's.
  • 0
    Guru 192875 points
    HI Vijay,

    Adding to Devin, at what power is your inverter switched on at? Also, do you've any load present?

    Regards,
    Gautam
  • 0 in reply to Devin Cottier
    Prodigy 100 points

    Thanks for the suggestions Devin. I resolved the problem by adding an inductor core to the USB cable that connects to the board (three turns around the core). This has fixed the problem and so far it never locked. If the problem reoccurs again I will check all the signals to make sure that they are compliant. I am using XDS100 V1 now and I wonder if i use v2 might help. Any suggestions? 

  • 0 in reply to Gautam Iyer
    Prodigy 100 points
    Gautam - see my response to Devin. Power to the inverter is 1KVA but now I am testing it with low power since I have this communication problem. Now that I fixed it I will slowly go to full power. Thanks all for fast response.
  • 0 in reply to Vijay Earanky
    TI__Guru 57255 points

    Hi Vijay,

    One note...

    If your C2000 chip is directly interfacing PWM driver/ADC signals (ie no isolation), I might recommend purchasing a TMDSCNCD28035ISO. 

    This 'ISO' controlCARD will contain an on-board xds100v1 whose ground is isolated from the C2000 ground.  This will help protect your computer from damage in case of a power stage fault (and help reduce some of the type of issues you reported in your original thread).

    Happy coding!


    Thank you,
    Brett

  • 0 in reply to Vijay Earanky
    Guru 192875 points
    Perfect Vijay! The core based USB cable proves to be very helpful. You get ones inbuilt with ferrite cores also, so no need for an external one.

    Goodluck & Regards,
    Gautam