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MSP-FET Blow JTAG Security Fuse

Other Parts Discussed in Thread: MSP430G2553, MSP-FET, MSP-TS430PW28A

Hi there,

I am trying to blow the JTAG security fuse on an MSP430G2553 using an MSP-FET as the hardware and Elpotronics FET-Pro430 as the software. I understand that the 2xx series requires the TEST/VPP line to be connected as per the image below for SBW. However, once I connect that line I cannot seem to establish JTAG communication with the FET-Pro software or even Code Composer Studio. Disconnecting TEST/VPP allows me to flash the chip without issues. Could this be an MSP-FET hardware malfunction?

Thanks,

Kyle

  • Hi Kyle,

    1. Do you use a TI board (if so which one) or a custom board?

    2. For a custom board: can you please provide a full schematic or connection list of exactly which pins on your MSP430 are connected to which pin #'s on the JTAG header on the MSP-FET tool? Including any passive components on any of the lines? Here is the header pin numbering, note where the key slot on the socket is:

    3. Do you include the R2 resistor on the TCK line pin 7 on the MSP-FET connected to TEST/SBWTCK on the MSP - this is needed if you want to blow the fuse.

    4. In addition, can you let us know how you are powering your board - is there any external power supply connected, or are you powering the board only from the MSP-FET tool?

    5. When you cannot establish communication with the MSP-FET - what do the LEDs on the MSP-FET look like?

    Regards,

    Katie

  • Hi Katie,

    1. I'm not using a TI board, I'm just programming a lone MSP430G2553 on a breadboard
    2. The schematic I'm using is identical to the schematic in the previous post
    3. Yes, I'm using a 330 ohm resistor
    4. The processor is powered only by the MSP-FET tool (VCC_TOOL on pin 2)
    5. The green LED stays lit and the red LED blinks a couple of times and then stops

    I ended up purchasing a FlashPro-430 programmer from Elpotronic and was successfully able to blow the JTAG fuse using the circuit I posted above. I think there may be something wrong with the MSP-FET and I will contact the reseller for a replacement.

    Thanks for your help!

    Kyle

  • Hi Kyle,

    Thanks for the additional information. It sounds like someone else is running into the same problem as you: e2e.ti.com/.../1719910 I am working with the tools team to see if some change was made between the MSP-FET and MSP-FET430UIF regarding blowing the fuse. I am hoping that the people I need to help answer this have not left for the holidays yet, but we will see what happens in that regard - we'll definitely work to get you an answer, there just unfortunately may be some delay.

    Regards,
    Katie
  • Thanks Katie, it's somewhat comforting to see that other people are having a similar issue and I'm not going crazy!

    I'll await your response.

  • Hi Kyle,

    Sorry for the long delay - teams have been out for the holidays. I wanted to reassure you that we're still looking into this.

    Regards,
    Katie
  • Thanks Katie,

    I assumed that's what was happening. I look forward to hearing a solution to this.

    Kyle

  • Hey Katie,

    Any updates on this?

    Kyle
  • Hi Kyle,

    We tried taking the MSP430G2553 device in both SBW and JTAG mode and were able to blow the fuse without issue using MSP-FET, with the device in TI's standard MSP-TS430PW28A target socket board. You can see the schematic for this board in www.ti.com/lit/pdf/slau278 on p. 59 section B.10. Can you confirm that your connections are exactly as described there?

    Another potential issue - you mentioned that you are using a breadboard. I'd be concerned about this - usually we recommend you must have short cables (<8 inches) between your MSP-FET and the device to minimize the capacitance and noise on the lines - with a breadboard, I'd be concerned your lines would not be very clean, and I wonder if that could be related to your problem...

    Do you have access to a TI target board?

    Regards,

    Katie

  • Hey Katie,

    I connected everything again without the breadboard and with short cables and it worked!

    Thanks for all your help,

    Kyle

  • Great! I'm glad to hear that fixed your issue :-)