LIS2DTW12 temperature accuracy

lgu.1 · ‎2021-07-27

Hello there,

I am currently using LIS2DTW12. In the datasheet, it states the accuracy of temperature sensor is 0.8 degree C(typ.), I notice the temperature reading has +/- 3 degree C among 10 LIS2DTW12 units. Is it normal? I also wonder if the LIS2DTW12 temperature sensor reads absolute temperature and has been factory calibrated. Or I need to calibrate the embedded temperature sensor in chamber for every unit.

Thanks,

-Lei

TBomb.1 · ‎2021-07-28

Hi, from my experience on LIS2DTW12 datasheet there are no "min" and "max" limits, so theoretically the parts are in spec. However usually T sensors are more accurate, at least at production line level.

https://www.st.com/resource/en/datasheet/lis2dtw12.pdf

It can be the case that the soldering process induces a worse accuracy than the nominal one, so as general rule a calibration at application level is always a good choice.

You have also to be sure that the sensors are tested in the same position and that the close environment doesn't affect the temperature measure.

Tom

lgu.1 · ‎2021-07-28

Hi Tom,

Thanks for looking into my question. Have you experienced larger than 0.8C variation on LIS2DTW12? The datasheet shows 0.8C accuracy. I'm not sure which type of T sensor is inside. The soldering process could be a potential issue. I am ordering a few EV board for LIS2DTW12 and will test their accuracy.

Thanks,

-Lei