基于ATmega16A的低功耗高精度桥式温度测量系统设计

Design of Low Power and High-precision Bridge Temperature Measurement System Based on ATmega16A

当前温度测量应用越来越广泛,针对工农业及科研领域对低功耗及高精度测温的要求,系统描述了一个桥式测温系统的设计方案与工作原理。系统采用低功耗AVR单片机作为控制芯片,通过单臂分压将热敏电阻分压后的电压信号传入A/D转换芯片,再将A/D转换后的数字量送入单片机计算,从而得到热敏电阻阻值,最后通过曲线拟合算出所测温度值。系统能实现低功耗、高精度测温。

At present, temperature measurement is used widely to meet the low power and hlgh-premslon requirements oi me industrial, agricultural and scientific research fields. The design of a bridge temperature measurement system and its working was described. A low-power AVR microeontroller was used as the control chip, which input the voltage signal to the A/D converter chip hy the partial pressure arm, then input the digital signal of the A/D converter to SCM to get the thermal resistance. Finally, the temperature values were calculated by curve fitting. It can realize low power consumption, high precision temperature measurement.