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TLV809K33 issue

Nilesh Kulkarni2
Expert 1120 points
Other Parts Discussed in Thread: MSP430G2333, TLV803

Hello All,

We are using TLV809K33 with MSP430G2333 for simple application which includes push button switches.

The issue which we are facing is with TLV809K33 assembled on Board the JTAG communication is not happening while programming the MSP430G2333.

But when we remove TLV809K33 from board and try to program it shows no error and get programmed. 

In our one of other project also we are facing same issue while programming controller.

Kindly help here by letting us know what protocol should we follow here or any particular care should we take while designing the board with TLV809K33.

Below is the snapshot of the portion of TLV809K33. Kindly advise on the same ASAP as we are stucked at this point.

Awaiting for your valuable response.

  • 0
    TI__Guru 55940 points
    Hi Nilesh,

    Is J1 in your application open or closed in your application at the time that this is occurring?

    If possible, could you provide a scope shot of VDD and /RESET while you are attempting to reprogram?

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Expert 1120 points
    Hello Ryan,

    In both cases means with TLV809K33 on board and without TLV809K33 on board J1 is closed and resistor R7 we have connected 0ohm.

    I will try to upload scope shot of VDD and RESET very soon.

    Kindly advise on the point related to J1.

    Awaiting for your valuable support here.
  • 0 in reply to Nilesh Kulkarni2
    Expert 1120 points
    Hello Ryan,

    Sorry to tell that we can not share scope shot as we do not have Oscilloscope in our facilities.
    One more input regarding Jumper J1.
    "The program is loaded irrespective of J1 being connected or not. It doesn't matter!!!. It happens either ways."
    Kindly advise on the same. Awaiting for your valuable response.
  • 0 in reply to Nilesh Kulkarni2
    TI__Guru 55940 points
    Hi Nilesh,

    I was curious about J1 because TLV809K33 is a push-pull device and does not require a pull-up resistor. I now recognize that the resistor and capacitor were likely added for proper JTAG communication if RST is not used.

    The internal pullup in the SVS may be interfering with the JTAG communication.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Expert 6825 points

    Hi Nilesh,

    A simple fix to try to get rid of the issue that you are having is to replace the push-pull device with pin to pin replacement open drain part. The TLV803 is open drain which means that you can leave your pull-up resistor. With the open drain configuration the JTAG should be able to pull the reset low and allow the device to be programmed.

    Best Regards,

    Mark