An apparatus and a method for measuring temperature in a cooking appliance, both of which utilize a circuit for reading an input from a thermal resistive device. By including a processor and an amplifier in the circuit, embodiments reduce the number of processor pins required to modify the amplified input arising from the amplifier. In one embodiment, the processor utilizes a single processor pin, through which is distributed a control output corresponding to the input and modifying the operating parameters of the amplifier.