1. A method for calibrating a temperature sensor, comprising: receiving first and second reference voltages from respective first and second tap points within a string of sequentially connected resistive devices of the temperature sensor, each resistive device having a resistance that varies as a function of temperature, the receiving performed at two or more known temperatures; outputting a respective code corresponding to each respective one of the two or more known temperatures, based on the first and second reference voltages; and adjusting at least one of the tap points, based on the two or more known temperatures and the respective output codes.