Statistical temperature sensor calibration apparatus and methodology

An integrated circuit (IC) comprising:

• a selection circuit coupled to receive first, second, third, and fourth voltages on first, second, third, and fourth inputs, respectively;
• a bandgap circuit coupled to provide the third and fourth voltages to the selection circuit;
• analog-to-digital conversion circuitry configured to generate first, second, third and fourth digital values based on the first, second, third and fourth voltages, respectively, as received from the selection circuit;
• and
• arithmetic circuitry configured to:
• derive a value of the second voltage based on the first and second digital values;
• determine an initial value of a constant based on the second voltage;
• determine a final value of the constant based on the initial value and a first voltage offset that is separate from the first and second voltages, the voltage offset being associated with a first temperature sensor that comprises the selection circuit, the bandgap circuit, and the analog-to-digital conversion circuitry;
• and
• subsequent to determining the final value of the constant, determine a temperature based on the third and fourth digital values and the final value of the constant.

A method comprising:

• applying a first voltage to a portion of a first temperature sensor, wherein the first voltage is provided from a source external to an integrated circuit (IC) upon which the temperature sensor is implemented, and wherein a value of the first voltage is a known value;
• applying a second voltage to the portion of the temperature sensor, wherein the second voltage is provided from a source on the IC, and wherein a value of the second voltage is initially unknown;
• generating first and second digital values based on applying the first and second voltages, respectively;
• deriving a value of the second voltage based on the first and second digital values;
• calculating an initial value of a constant based on the value of the second voltage;
• calculating a final value of the constant based on the initial value and at least one voltage offset that is separate from the first and second voltages;
• and
• subsequent to determining the final value, using the constant to calculate temperatures sensed by the first temperature sensor.