AnsweredAssumed Answered

MKW30Z temperature sensor calibration

Question asked by Lucian Firan on Nov 28, 2016
Latest reply on Nov 29, 2016 by EARL GOODRICH

KW40Z_Connectivity_Software_1.0.1 (KSDK_1.3.0) IAR 7.5


MKW40Z/30Z/20Z Reference Manual, Rev. 1.2, 10/2015
28.4.8 Temperature sensor     links to

Temperature Sensor for the HCS08 Microcontroller Family (document AN3031).


witch presents a calibration implementation:


Calibrated (3 Points) Typical Accuracy ± 2.5degs C
Uncalibrated  Typical Accuracy ± 8degs C


Calibrated (3 Points) Typical Accuracy ± 12degs C
Uncalibrated  Typical Accuracy ± 18degs C


In conclusion having fixed-point arithmetic calibrated and un-calibrated does not help you at all...


Having no calibration at all and floating point algo goes to ±8 deg C with is quite hight.


3 point calibration gives good result but is hard to achieve in production (as time and resources).


In production, one point calibration is the easiest to do - measure by chip and measure by reference thermometer near chip.
(@ room temperature)


The HCS08 AN3031 document is accurate on MKW30Z ?


Is some sort of calibration implemented in framework ?


What would be the Calibrated 1 Point Typical Accuracy ?


Thank you,