SNIA049 November 2022 TMP61 , TMP61-Q1 , TMP63 , TMP63-Q1 , TMP64 , TMP64-Q1
Achieving high accuracy across temperature with traditional negative temperature coefficient (NTC) thermistors requires calibration at at least three different temperatures due to the non-linearity of NTCs across temperature. The TMP6x family of linear thermistors makes achieving high accuracy across temperature much more simple and cost effective. With the TMP6x thermistors, a single-point offset calibration can be performed at any temperature due to their linearity across temperature. Implementing oversampling and software filtering help eliminate noise from sensor readings and make it easier to see where the sensor truly is with respect to temperature. These methods can result in ±1°C accuracy or better across temperature with the TMP6x.
This document familiarizes the user with the steps needed to achieve high accuracy with the TMP6x thermistors. The document includes descriptions of a single-point offset correction, software methods of oversampling and filtering, as well as pseudocode for each to assist with evaluation and implementation.