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how to find open and short circuit conditions in lmp90100

vijay kumar2
Intellectual 270 points
Other Parts Discussed in Thread: LMP90100

Hello,

          I am using lmp90100 AFC. In this data sheet they mentioned detection of open and short circuit is there.

But the procedure they didn't mentioned. 

So please can anybody tell me, how to how to find out open and short circuit in lmp90100

Thanks in Advance

vijay kumar

  • 0
    TI__Intellectual 2065 points

    Hello Vijay,

    Ref to datasheet Pg.34 and 35 of LMP90100 which explains open and short circuit detection using the Rails flag and short thershold flag.

    Regards,
    Murali

  • 0 in reply to MS1291
    Intellectual 270 points

    Hello Murali,

        Thanks for reply.

        I didn't find anything about those flags in Pg.34 and 35 of lmp90100 datasheet.

    Can you explain me clearly.

    Regards,

    Vijay Kumar

  • 0 in reply to vijay kumar2
    TI__Intellectual 2065 points

    Hi Vijay,

    Open Condition: In a open condition, since there is no return path for the sensor diagnostics current, it will  charge the capacitor present on the line/pin cap. This will make the voltage at the input to Rail which results in triggering the rails flag.

    Short condition: If there is a short to GND or VA then this will again result in rails flag being set. If the two terminals of the sensor are shorted then depending on the sensor diagnostics  threshold register, short thld flags will be set.

    Regards,
    Murali

  • 0 in reply to MS1291
    Intellectual 270 points

    Thanks for the reply and sorry for the delay from my side.

             Yeah, What you said I got it. In the datasheet diagram for thermocouple 2 capacitors are there 2.2uf and 10nf which one is required.

    Please Tell me

    Best Regards 

    Vijay kumar