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 provided at the same time from the first and second tap points, respectively; and adjusting at least one of the tap points, based on the two or more known temperatures and the respective output codes.