• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 487 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS3305 WDI function

dan kantorski
Intellectual 910 points

 I was wondering if the watchdog function remains active if the WDI pin is left unconnected?  While doing emulation with the dsp, it is possible that I would stop on a step, leaving the processor halted for some time and would not desire a reset in this state.  I would place a jumper on the board to break the WDI connection while doing these activities.

  • 0
    Prodigy 50 points

    You can find the answer in:

    TPS330x Supervising DSP and Processor Applications

    "The watchdog input (WDI) is supervised by a transition detector to reset the watchdog timer at
    each positive or negative transition. If this input is not electrically connected, an internal driver
    with a 40-kΩ resistor delivers the necessary transitions in time, so that RESET is not asserted."

    Grab the white paper - will probably be of interest:

    http://focus.ti.com/lit/an/slva056a/slva056a.pdf

    In short - just float it.  Do not use a pull-up or you will defeat the internal circuitry.