Method and device for detecting temperature

Abstract

The invention discloses a method and a device both for detecting the temperature, and belongs to the technical field of electronics. The method for detecting the temperature includes steps as follows: presetting temperature zones corresponding to temperature characteristic functions of multiple groups of NTC (Negative Temperature Coefficient) resistance, wherein the temperature characteristic functions of the multiple groups of NTC resistance correspond to different resistance values of variable resistance; reading out the present characteristic value of the NTC resistance, wherein the present variable resistance is the first resistance value, and the temperature characteristic function corresponding to the first resistance value is the first temperature characteristic function; acquiring the present temperature value according to the first temperature characteristic function and the present value of the NTC resistance; in case that the present temperature value is not within the first temperature zone corresponding to the first temperature characteristic function, acquiring information of the second resistance value corresponding to the second temperature zone to which the present temperature value belongs; and according to the information of the second resistance value, adjusting the variable resistance as the second resistance value, so as to detect the temperature according to the second temperature characteristic function corresponding to the second resistance value. The invention improves the accuracy of temperature detection.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a temperature detection method and device. Background technique [0002] At present, in various consumer terminals and electronic equipment, the temperature detection is generally realized through negative temperature coefficient (NTC) resistors, wherein the resistance value of the NTC resistor changes in the opposite direction with the change of temperature, that is, when the temperature When the temperature rises, the resistance value of the NTC resistor decreases; when the temperature decreases, the resistance value of the NTC resistor increases. [0003] When the resistance value of the NTC resistor changes, the analog-to-digital converter (Analog-to-Digital Converter, ADC) value corresponding to the voltage on the NTC resistor also changes synchronously. By detecting the current ADC value of the NTC resistor, and then according to the predetermined ADC value-temperature...

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Problems solved by technology

[0004] However, the resistance-temperature characteristics of NTC resistors are not linear, but exponential, such as figure 1 As shown; in some temperature ranges, the resistance value of the NTC resistor does not change significantly, so the measured ADC value does not change much, and it is difficult to distinguish the temperature change, which reduces the temperature detection accuracy

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