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Temperature Sensor Calibration

Rohit J
Intellectual 850 points
Other Parts Discussed in Thread: LMT70, TMP107, LMT01, TMP112, TMP20, LM94022

Hi Team,

Does TI make any temperature sensor that is pre-calibrated? If not, what is best and easiest technique to calibrate a temp sensor?

Thanks!

  • 0
    TI__Expert 7220 points

    Hi Rohit,

    All of TI's temperature sensors do not need to be calibrated to meet datasheet specifications. However there are calibration techniques we can recommend. One advantage of calibration is to get better accuracy out from a part. The disadvantage is that it involves more steps and can lead to higher production cost for the customer. Is there a particular application or accuracy that is needed?

    -Michael Wong

  • 0 in reply to Michael Wong
    TI__Intellectual 850 points
    Hi Michael,

    Thanks for the prompt reply. It is for battery pack temperature measurement. We need as accurate as possible at 25 deg C. What technique would you recommend?
  • 0 in reply to Rohit J
    TI__Expert 7220 points
    Hi Rohit,

    I just want to confirm the accuracy is 25C or 2.5C?

    -Michael Wong
  • 0 in reply to Michael Wong
    TI__Intellectual 850 points
    Michael,

    Best accuracy at 25 degrees Celsius.

    Thanks!
  • 0 in reply to Rohit J
    TI__Mastermind 37370 points

    Hi Rohit,

    Are you planning to use the temperature sensor for automotive battery pack? Not sure if you need a local or remote temperature sensors. Below is a few device from our portfolio.

    1. Analog temperature sensor LMT70 best accuracy ±0.05°C (typ), 0.13°C (max), range 20°C to 42°C, required ADC

    2. Digital temperature sensor TMP107, accuracy ±0.125°C (typ), 0.4°C (max), range -20°C to 70°C, UART interface

    3. Digital temperature sensor LMT01, accuracy ±0.125°C (typ), 0.5°C (max), range 25°C, 1-wire interface

    4. Digital temperature sensor TMP112, ±0.1°C (typ), ±0.5°C (max), range 25°C, I2C interface

    Let us know if you have any other question.

    Aaron

  • 0 in reply to Aaron Heng
    TI__Intellectual 850 points

    Hi Aaron,

    I am definitely interested in the local analog output temperature sensors. Currently I am comparing TMP20 and LM94022 for my needs.

    I am looking into accuracy, temp range, output impedance. Is there any other parameter that I should concern myself with?

    Lastly, calibration may be needed at 25 deg Celcius for tighter accuracy bounds. What would be the best technique for calibrating the sensor? Looking for easy and effective.

    Thanks in advance!

  • 0 in reply to Rohit J
    TI__Expert 7220 points
    Hi Rohit,

    The parts that Aaron mentioned have very good accuracy around 25C. Is there a particular accuracy you are looking for? Maybe you do not need any calibration for your system. If you do, we can send you a document offline.

    Accuracy, temperature range, output impedance are good parameters to look out for initially. The other parameters you should look at is communication interface, power consumption, package, number of wires, output drive strength, it really depends on the system.

    Let us know if you narrow down the parameters you are looking for.

    -Michael Wong