Circuit and method for achieving high-precision temperature measurement based on 12-bit ADC

Abstract

The invention discloses a circuit and a method for achieving high-precision temperature measurement based on a 12-bit ADC. The problem that the precision and the cost cannot be simultaneously considered in the prior art is solved. The circuit comprises a Wheatstone bridge module, a differential module and a sampling module which are connected in sequence, the sampling module comprises an analog-to-digital converter ADC, the analog-to-digital converter ADC has 12 bits, and a temperature value can be obtained after data sampled by the analog-to-digital converter ADC is converted. According to the circuit and the method, cost does not need to be increased, design burdens of software and hardware of products are reduced, calculation and implementation are easy, cost is reduced while high precision is achieved, and batch production is easy.

Description

technical field [0001] The invention relates to the field of temperature measuring equipment, in particular to a low-cost and easy-to-implement method for realizing high-precision temperature measurement based on a 12-bit ADC. Background technique [0002] The electronic thermometer consists of a temperature sensor, a liquid crystal display, a button battery, an ASIC and other electronic components. It can quickly and accurately measure body temperature. Compared with traditional mercury glass thermometers, it has the advantages of convenient reading, short measurement time, high measurement accuracy, memory and buzzer prompts, especially the electronic thermometer does not contain mercury, which is harmful to human body and body. The surrounding environment is harmless, especially suitable for use in homes, hospitals and other occasions. For electronic thermometers to achieve accurate temperature measurement, a high-precision ADC module is required to collect the resistanc...

AI Technical Summary

Problems solved by technology

[0004] The present invention is to overcome the problem that the accuracy and cost of the prior art cannot be taken into account at the same time, and provides a method for realizing high-precision temperature measurement based on a 12-bit ADC. The data sampled in the present invention can be converted to obtain a temperature value. Through the method of the present invention The solution allows the thermometer to achieve a high precision of 0.01°C without increasing costs

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