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TMS320F28335: Error connecting to the target: (Error -1015 @ 0x0) in F28335

Suraj Dash
Prodigy 190 points
Part Number: TMS320F28335

Hello,

        I was using the TMS320F28335 control card with USB EMU R3 Docking station. It worked fine .Suddenly, now I am getting connection error. While trying to debug a program using CCS, the following error message is coming up :

Error connecting to the target: (Error -1015 @ 0x0) Device is not responding to the request. Device may be locked, or the debug probe connection may be unreliable. Unlock the device if possible (e.g. use wait in reset mode, and power-cycle the board). If error persists, confirm configuration and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 8.0.27.9)

     I tried checking the XRS pin, but couldn't find the pinout on the Docking Station. Is there any documentation available for this? Is there any other hardware or software test to debug the problem?

Also, if the device is permanently locked,then which part of the card is getting locked? And is there any way to repair or replace the card in that case? 

Thanks

  • 0
    Guru 30330 points
    Suraj,

    XRSn does not go down to the docking station. If you look at the Schematic for the ControlCard itself. you can see XRSn can be probed at R17, C34, or Pin 1 of U6.

    As you were using the EVM at the time it stopped working, I suspect that some transient event may have occurred which might have damaged the device. Are you driving a high-voltage application?

    I would suggest checking all voltages on the PCB as well. look for shorts between power and ground pins. check for voltage levels. etc. If you are actively connected to an application board or to other EVMs, disconnect so that you just have the ControlCard and Docking Station and hopefully can isolate the problem.

    Depending on your soldering skills, or access to someone with these abilities, you can replace components as needed. If you are unable to find the damaged component, you will need to order a new board: www.ti.com/.../TMDSDOCK28335

    Regards,
    Mark
  • 0 in reply to Mark Labbato
    Prodigy 190 points
    Thank you Mark Sir,
    I tried debugging and found that C37 of power supply is shorted. This means 3.3V is getting directly connected to the ground. So that may be the problem. I will replace and check that. But i am just curious to know what is reason behind shorting of capacitor.

    Suraj
  • 0 in reply to Suraj Dash
    Guru 30330 points
    Suraj,

    Glad that you found a possible culprit!

    I can only speculate unfortunately on why that Cap was damaged. It may have previously been compromised from other events and was just the first component to be damaged. Again, if you are driving external devices, or your application was not configured properly, you could have either had an overvoltage or overcurrent event that damaged that cap.

    Please ensure that you are keeping all of your voltages and currents within the datasheet limits of the MCU and all the other ICs on the board. Also be sure to follow safe ESD handling. Even touching the PCB while not properly grounded has the potential to damage components.

    Regards,
    Mark
  • 0 in reply to Mark Labbato
    Prodigy 190 points

    Hello Mark Sir,

    I replaced the capacitor and found out that capacitor was ok. All 3.3 v supply on the board is shorted to ground somehow. I doubt the power supply U2. But the 1.8  v output is working fine. So what may be the reason for this ? Should I remove the U2 IC?

    Thanks

    Suraj

  • 0 in reply to Suraj Dash
    Guru 30330 points
    Suraj,

    It is your board, you can do with it whatever you want! But yes, if the U2 IC is damaged, you can try to replace it as well.

    You might also look for other pull down resistors or decoupling capacitors too. These all have the potential to short out when damaged. It may not be the Power IC, but in fact could still be just a small passive.

    -Mark
  • 0 in reply to Mark Labbato
    Guru 30330 points
    Hello again Suraj,

    Have you been able to replace or find other damaged components?

    -Mark
  • 0 in reply to Mark Labbato
    Prodigy 190 points

    Hello Mark Sir,

    I found out the faulty component. It was the U2 ic. After removing it there is no short. But actually i lost the inductor L19 during removing the ic. Now i am unable to fine that inductor online. It is no longer manufactured. Can i use any other inductor ?

    Thanks

    Suraj

  • 0 in reply to Suraj Dash
    Guru 30330 points

    Suraj,

    You can replace with an equivalent part. It is generally best to find the specs of the part and replace with an equivalent. e.g. if the BOM called for a 0.1 uF X5R Ceramic with 20% tolerance and a 16 V rating, you should try to find an  equivalent. 

    Regards,

    Mark