CALIBRATION OF TEMPERATURE SENSING CIRCUITRY IN AN ELECTRONIC DEVICE
First Claim
1. An apparatus for thermal management in an electronic device, the apparatus comprising:
- integrated circuitry that includes an analog-to-digital converter (ADC), and a multiplexer having an output coupled to an input of the ADC;
a resistor coupled to a first input of the multiplexer; and
a thermistor coupled to a second input of the multiplexer, wherein the resistance of the resistor is about the same as the resistance of the thermistor when the thermistor is below a critical thermal bound of the electronic device.
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Abstract
Temperature sensing circuitry is used for thermal management of an electronic device. The temperature sensing circuitry includes at least one thermistor placed at or near a component of the electronic device. The temperature sensing circuitry also includes a high-precision resistor for calibration purposes. The resistance of the resistor is equivalent to the resistance of the thermistor at a reference temperature. A calibration reading is obtained using a set current that is being passed through the resistor. An error present in the temperature sensing circuitry is determined based on the calibration reading and a design value. A temperature measurement associated with the component is then made using the thermistor, while the set current is being passed through the thermistor. The error is corrected in the temperature measurement of the component. Other embodiments are also described.
58 Citations
11 Claims
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1. An apparatus for thermal management in an electronic device, the apparatus comprising:
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integrated circuitry that includes an analog-to-digital converter (ADC), and a multiplexer having an output coupled to an input of the ADC; a resistor coupled to a first input of the multiplexer; and a thermistor coupled to a second input of the multiplexer, wherein the resistance of the resistor is about the same as the resistance of the thermistor when the thermistor is below a critical thermal bound of the electronic device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An article of manufacture comprising a computer readable medium including instructions that, when executed by a processing system, cause the processing system to:
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compute a temperature correction, based on an output signal of an analog-to-digital converter (ADC) while an input signal to the ADC is a function of a set current being passed through a resistor; obtain a temperature reading, based on the output of the ADC while the input to the ADC is a function of the set current being passed through a thermistor; and adjust the temperature reading with the temperature correction, to obtain a calibrated temperature that is associated with a component of the electronic device. - View Dependent Claims (8, 9, 10, 11)
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Specification