基于MSP430的超低功耗温度监测站  

Ultra Low Power Temperature Monitor Based on MSP430

作　　者：范秋华[1] 李健[1] 张旭[1] 

机构地区：[1]青岛大学自动化与电气工程学院,山东青岛266071

出　　处：《青岛大学学报（工程技术版）》2017年第4期63-67,共5页Journal of Qingdao University(Engineering & Technology Edition)

基　　金：山东省自然科学基金资助项目(ZR2015FRM017)

摘　　要：针对目前市场上温度监测设备的功耗问题,本文设计了一种基于MSP430的超低功耗温度监测站,将0.01F超级电容用2mA电流恒流充电至4.2V,使用TI的低功耗电源芯片TPS62740(降压)和TPS610980(升压)构成Buck和Boost两种斩波电路进行供电。使用模拟开关TS5A3159进行切换,当电容电压大于2.4V时使用降压通道,小于2.4V时使用升压通道。同时,采用IIC总线读取TMP112采集的温度数据,转换为二进制代码表示十进制数(binary-coded decimal,BCD)后通过SPI总线发送,实现超级电容+光伏电池供电条件下的长期温度监测。系统会定期通过高精度晶振对系统时钟进行校准,在几乎不增加功耗的情况下保证时标精度。实验结果表明,当系统正常运行时,静态电流约为0.7μA,正常情况下可以达到7~8h的运行时间。本设计具有测量精度高、便于安装、操作简单、超低功耗等特点,适合现场无电源情况下使用。Aiming at the power problem of current market power temperature monitoring equipment, this paper designed an ultra low power temperature monitor based on MSP430. The 0. 01 F super capacitor with 2 mA constant current charge to 4. 2 V, is powered by TI low power chip TPS62740 （Buck） and TPS610980 （boost） which is composed of Buck and Boost two chopper circuits. Using analog switch TS5A3159 , the circuit will connect a buck channel when the capacitor voltage is greater than 2. 4 V, or a boost channel. At the same time, the temperature data collected by TMP112 will be read by the IIC bus and converted to BCD （Binary-Coded Decimal） code, and sent by the SPI bus, so as to achieve long-term temperature monitoring of super capacitor ＋ PV battery powered condition. The system will periodically calibrate the system clock with the high precision crystal oscillator,to ensure the accuracy of the time scale without increasing the power consumption. The ex-perimental results show that when the system is in normal operation, the quiescent current is about 0. 7 yA , and the running time of 7 -8 h can be achieved under normal conditions. With the advantages of high measure-ment accuracy easy installation simple operation and low power consumption, the design will be suitable for use in the field without power supply.

关 键 词：MSP430 TPS62740 TPS610980 TS5A3159 TMP112 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置] TP302.1[自动化与计算机技术—控制科学与工程]