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 ?