Now that we have the hardware design completed, the TI thermistor design tool can be used to generate software for internal resistance-temperature conversion within the MCU. Take a look at how to generate the code snippets from the Thermistor Design Tool.

We will use the following design parameters:

5-V, 10-kΩ bias resistor, 12-bit ADC, TMP6131DYA.

Figure 2-8 Thermistor Design Tool Parameters.

Next we can move to the Device Resistance Tables tab. Here we can find both a 1°C and 5°C step look-up table. This page dynamically populates the resistance tables depending on the design parameters initially set. The 5°C Look-Up Table is shown below:

Figure 2-9 5°C LUT.

On this page, we can find C code for the look-up table, as well.

Figure 2-10 5°C LUT C Code.

From simply implementing a look-up table, a comparison between the TMP6 thermistor accuracy and a typical NTC thermistor across the full operating temperature range is plotted below.

Figure 2-11 Un-Corrected Thermistor Accuracy Comparison.