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LMT01: ACCURACY of LMT01

Nikita Alisov0
Prodigy 80 points
Part Number: LMT01

I'm studying the documentation for this sensor and I'm confused.

Your datasheet have table in 6.5 chapter. In this table tupical temperature accuracy is writing as 0.125 celsius and maximum 0.685 celsium. Realy cool.But!
In the same table "Numberof pulsesat 0°C" writing as 800...816 pulse, and "Resolutionof one pulse" as 0.625 celsium per pulse.
Simple calculations show that in this case 800 ... 816 pulses is a temperature in the range -5 ... 5 degrees Celsius.

When i am read 808 pulse from LMT01 what about temperature? Value? Accuracy? Probability?

And what wtis temperuture, if i read 1120 pulse?

Thank you and have a nice day!

  • 0
    TI__Expert 5695 points
    Support team from TI will contact you shortly.
  • 0 in reply to Jose Arteaga4
    TI__Genius 13650 points

    Hello Nikita,

    the resolution of one pulse is 0.0625°C (not 0.625°C). Therefore, the guaranteed temperature accuracy at 0°C ambient temperature is +/- 0.5°C.

    At 25°C ambient, the typical accuracy is +/-0.125°C, and the guaranteed accuracy is +/-0.5°C.

    Note that for best results, use a look-up table. For example, if you use the WSON device (look-up table in 6.7) and measure 1120 pulses, then the temperature can be converted in the following way:

    Determine the degrees / pulse at the area of interest: 10/(1125-966)=0.06289 °C / pulse

    Calculate the equivalent temperature of 1120 pulses by interpolating between 10°C and 20°C: 10°C+((1120-966)*0.06289)=19.686°C.

    Interpolating between 10°C segments by using the look-up tables provided in the datasheet will result in more accurate readings than the 2-point approach slope from -50°C to 150°C and will allow you to achieve the accuracy specifications in table 6.5.

  • 0 in reply to Ben Kasemsadeh
    Prodigy 80 points
    Oh... I am so sorry! I thought about complicated things, and make mistake in so easy place (vision error 0.o625) =)
    Thank you very much!
  • 0 in reply to Nikita Alisov0
    TI__Genius 13650 points

    Hello Nikita,

    you're welcome, I'm glad I could help. Good luck with your design.