A method includes using a thermistor as a temperature sensor and connecting a pull-up resistor in series to the thermistor in a voltage divider circuit. The pull-up resistor is fabricated in an integrated circuit and includes a series of resistor segments connected to selectable voltage output tabs. The method further includes selecting an output voltage tab for a selected resistance segment having a selected resistance value to match a target resistance value for the pull-up resistor that is smaller than the as-fabricated resistance value of the pull-up resistor, calculating a ratio of a voltage on the thermistor and a voltage on the selected output voltage tab in the voltage divider circuit, and mapping the calculated ratio to a temperature value of the thermistor based on a temperature-resistance relationship of the thermistor in combination with the target resistance value of the pull-up resistor.