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LM75A OS connection

Sonny Zamot
Intellectual 465 points
Other Parts Discussed in Thread: LM75A

hello I have a question I don't want to use the OS feature in the chip, should I leave it floating or tide it to ground?

thanks 

  • 0
    TI__Guru 71516 points

    Hello Sonny,

      I moved this to the Temp Sensors Forum; the O.S. pin is open-collector and technically can be left open.  However, good design practices would suggest connecting a pull-up resistor, if for nothing else, just to have a monitor function during debug.  As stated in the datasheet:

    7.5.6 O.S. Output

    The O.S. output is an open-drain output and does not have an internal pullup. A “high” level will not be observed on this pin until pullup current is provided from some external source, typically a pullup resistor. Choice of resistor value depends on many system factors but, in general, the pullup resistor should be as large as possible.  This will minimize any errors due to internal heating of the LM75A. The maximum resistance of the pullup, based on LM75A specification for High Level Output Current, to provide a 2-V high level, is 30 kΩ.   

    ~Leonard

     

  • 0
    TI__Guru 71516 points

    Sonny,

     Just wondering what you did with this pin?  Any other questions/issues?  How is the overall design progressing?  Let us know if there are any other areas of the design where we can assist.

    ~Leonard

      .