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TPS3305 questions

Jaden Ghylin102047
Expert 1140 points
Other Parts Discussed in Thread: TPS3305, TPS386596

Using TPS3305-33DGNR to monitor 5V and 3.3VDC.  We connect the MR pin to a push button switch for manual reset during development.  This part includes a watchdog input which we do not use (left floating). 

  1. What is the correct input state for Pin 7 for a design using the TPS3305 without a watchdog signal?
  2. Is there a pin-compatible replacement for the TPS3305 that does not have a watchdog input?
  3. Is there a more cost effective replacement for the TPS3305 that can be used to sense 3.3V/5V and provide an input for a manual switch with outputs similar to the 3305?

Jaden

 

  • 0
    TI__Expert 8905 points

    Jaden,

    To disable the watchdog leave the WDI pin (pin 3) floating. More on this can be found here:

    http://www.ti.com/lit/an/slva145/slva145.pdf

    The MR/ pin should not be effected by disabling the watchdog. It is internally pulled high so for normal operation you can just leave the MR/ pin floating, and bring it low with the push-button.

    For a part without a watchdog input, you could look at the TPS3707-50 but it is not P2P.

    The TPS386596 would be another option, but again not P2P.

    Regards,

    David