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TMS32F2812 HARDWARE PROBLEMS

Oscar Baumann
Intellectual 835 points

Other Parts Discussed in Thread: CONTROLSUITE, TMS320F2812

Hi, i created my own dsp evaluation board.

And i have some problems with the output voltage, for example all gpios have 1.5V, i don't know why?

I really apreciate your help.

  • 0
    TI__Guru 60865 points

    You will need to provide more information to troubleshoot your problem.

    ControlSUITE provides the full schematics and layouts of many C2000 development boards and evaluation kits.  I would recomend comparing these to your board to see if there are any  signifcant differences in the power distribution or GPIO connections. 

  • 0 in reply to Devin Cottier
    Intellectual 835 points

    Hi Devin, Thanks for your help. But I didn't find the solution on control suite.

    My problem is the following; I am using TPS767D301 this dual regulator, and it's working ok. But when I fed my tms320f2812 device, all vddio have 2.4V instead of 3.3 and all vdd have 0.7v so all voltages are reduced i don't know why.

    I really apreciate your help, because I didn't find the solution.

    Thanks again.

  • 0 in reply to Oscar Baumann
    TI__Guru 60865 points

    Looking at the data sheet for that regulator, it seems like it should be fine. 

    Can you measure the output current that is being supplied from regulator? Does this exceed the expected current draw from the F2812 device? Are there any other significant current consuming devices on these rails? Are there any low resistance paths to ground on these rails? 

    What is supplying the input voltage to the regulator?  Does this have sufficient current capability to drive the F2812 and other devices on the rails, taking into account the (possibly significant) losses in the regulator?

    Is the device correctly oriented on the board?

    I am assuming you are unable to connect to the device. 

  • 0 in reply to Devin Cottier
    Intellectual 835 points

    Hi Devin thanks again for your help. I measure output current of the regulator and it's correct.

    Right now i have another problem XRS pin, I have an output voltage 2.4V. I read that watchdog management the XRS pin, but just pulling the pin to ground, I dont know why i am having that output voltage, any idea?

    Thanks a lot.

  • 0 in reply to Oscar Baumann
    TI__Guru 60865 points

    I suspect your XRS problem is related to the other issues you are having.   Can you post the schematics for your board? 

  • 0 in reply to Devin Cottier
    Intellectual 835 points

    Thanks Devin, Yes I found the problem with XRS pin.

    But now  have another problem, all pins that require 1.9V i have this voltage, but all pins that need 3.3V appear just 800mV. 

    The oscillator it's not working, i want to know if that voltage problem is for that reason (oscillator doesn't work).

    Yesterday my board was working ok, but today i'm having that voltage problem.

    Another question probably the oscillator is very unestable so in your opinion it's better use an external CLOCK?

    thanks again.

  • 0 in reply to Oscar Baumann
    TI__Guru 60865 points

    What type of oscillator do you have on your board?  Typically I would expect a crystal or crystal oscillator, which should be more than sufficient for most applications of the device. However, these tend to be somewhat sensitive, so make sure your oscillator has not been damaged from previous/current voltage issues.