• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 30 subscribers
  • Views 275 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.

LMP91000: Self-Diagnosis

Michael Jeong1
Expert 2630 points
Part Number: LMP91000

Hello Expert,

When we look at the data sheet, there seems to be information about self-diagnosis as shown below.

We believe it is about CA testing.

We tested using +30mV and -30mV as the BIAS voltage, and the voltage in response is similar to the graph in the datasheet.

But the maximum and minimum values are shown as output.

I know that CA test usually come out in the form of a graph like below.

I would like to know how to judge sensor performance based on the graph from the data sheet, and I would like to know if there is a solution that allows me to use self-diagnosis in my project.

Best Regards,

Michael

  • 0
    TI__Genius 12215 points

    Hi Michael,

    Please clarify for me if I am interpreting your question incorrectly, but I believe all you need to do to see the output pulse in the datasheet is read Vout when you send the pulses. Is your confusion coming from the datasheet graph where the output maxes out on its swing? The datasheet section you clipped mentions that what is important here is not the full transient or where it stops, but the slopes of the transient (if the transient is not present on test, could be fault with connection or a problem with the sensor). So for you, as long as you see a quick transient on the Vout pin, that will serve as good diagnostic.

    Regards

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Expert 2630 points

    Hello Alex,

    Thanks for your reply.

    The Sensor Test Procedure checks whether the sensor is operating. Or is it possible to just check whether or not it is properly connected to the LMP91000?

    Is it possible to test how much life is left of the sensor using the Sensor Test Procedure?

    If yes, could you please tell me how I can test it?

    Additionally, are there any other functions that can be checked other than those mentioned above using the sensor test procedure?

    Best Regards,

    Michael

  • 0 in reply to Michael Jeong1
    TI__Genius 12215 points

    Hi Michael,

    The sensor test procudure that is described in the datasheet is the only test procedure/functionality I am aware of for LMP91000. This test will address both the sensor element functionality and the connection to the LMP91000. If you want to isolate it, make sure the LMP91000 is connected to a working sensor. Then once the test passes, you know the connection has integrity as long as the sensor isnt removed from the LMP91000.

    After that, run the test periodically (at your desired frequency) to check the sensor health since at this point you know the connection is good. Unfortunately there isnt a test or feature on the LMP91000 to measure the life remaining or get a quantifiable status on the sensor cell, so running this test periodically will be essential to make sure the sensor remains working OK.

    Regards

    -Alex Thompson