US 2026/0235453 A1Published application

Temperature sensing apparatus and method having calibration mechanism

AssigneeRealtek Semiconductor Corp.

InventorsI-CHE OU, Chuan-Chu Liu, Zhao-Hong Tu

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Abstract

A temperature sensing method is provided. A first and a second voltage digital codes are configured corresponding to a first and a second temperatures. A base temperature that makes a voltage across a component of a temperature sensing circuit to be a constant is configured. A temperature difference and a digital code difference are calculated to further calculate a predetermined slope to establish a relation equation. A sensing is performed corresponding to the first temperature to generate an actual voltage digital code. A base temperature difference is calculated between the first temperature and the base temperature and an actual digital code difference between the actual voltage digital code and the first voltage digital code are calculated to further calculate a slope variation to modify the relation equation to perform temperature sensing by using the temperature sensing circuit according to the modified equation.

Claims12

Dependent claims

A temperature sensing method having a calibration mechanism, comprising:

configuring a first voltage digital code corresponding to a first temperature by a processing circuit;
configuring a second voltage digital code corresponding to a second temperature by the processing circuit;
configuring a base temperature by the processing circuit, wherein a cross voltage of sensing circuit components in a temperature sensing circuit is a constant under the base temperature;
calculating a predetermined temperature difference between the first temperature and the second temperature and a predetermined digital code difference between the first voltage digital code and the second voltage digital code by the processing circuit so as to further calculate a predetermined slope according to a first ratio between the predetermined digital code difference and the predetermined temperature difference and establish a predetermined temperature and digital code relation equation according to the predetermined slope;
performing a sensing by the temperature sensing circuit corresponding to the first temperature to generate an actual voltage digital code;
calculating a base temperature difference between the first temperature and the base temperature by the processing circuit;
calculating an actual digital code difference between the actual voltage digital code and the first voltage digital code by the processing circuit, so as to further calculate a slope variation according to a second ratio between the actual digital code difference and the base temperature difference;
calibrating the predetermined slope according to the slope variation by the processing circuit to generate a calibrated slope to replace the predetermined slope in the predetermined temperature and digital code relation equation to generate an actual temperature and digital code relation equation;
and
performing a temperature sensing by using the temperature sensing circuit according to the actual temperature and digital code relation equation.

7 more elements

A temperature sensing apparatus having a calibration mechanism, comprising:

a temperature sensing circuit;
and
a processing circuit configured to execute a temperature sensing method, comprising:
configuring a first voltage digital code corresponding to a first temperature;
configuring a second voltage digital code corresponding to a second temperature;
configuring a base temperature, wherein a cross voltage of sensing circuit components in the temperature sensing circuit is a constant under the base temperature;
calculating a predetermined temperature difference between the first temperature and the second temperature and a predetermined digital code difference between the first voltage digital code and the second voltage digital code so as to further calculate a predetermined slope according to a first ratio between the predetermined digital code difference and the predetermined temperature difference and establish a predetermined temperature and digital code relation equation according to the predetermined slope;
performing a sensing by the temperature sensing circuit corresponding to the first temperature to generate an actual voltage digital code;
calculating a base temperature difference between the first temperature and the base temperature;
calculating an actual digital code difference between the actual voltage digital code and the first voltage digital code, so as to further calculate a slope variation according to a second ratio between the actual digital code difference and the base temperature difference;
calibrating the predetermined slope according to the slope variation to generate a calibrated slope to replace the predetermined slope in the predetermined temperature and digital code relation equation to generate an actual temperature and digital code relation equation;
and
performing a temperature sensing by using the temperature sensing circuit according to the actual temperature and digital code relation equation.

10 more elements

Dependencies are inferred from the claim text.