低功耗智能 传感器 的设计介绍
在工业控制过程中，经常需要对一些参数进行测量，而一般 传感器 的输出信号较弱，不适合作远距离传输。为了减小干扰，通常采用4～20mA电流输出的双绞线变送器。信号模拟处理的变送器，由于电路的复杂性的限制，非线性补偿效果不理想，很难在全温度范围内实现温度补偿，因此达不到较高的精度要求。随着低功耗高精度单片机、Σ-Δ ADC和Σ-ΔDAC的日益普及，为高精度的智能变送器的设计提供了技术途径。 　　
本文介绍的单片传感信号接口设计采用了德州仪器公司新近推出的一款多功能的微控制器MSP430F2013，它内部集成了16位的Σ-ΔADC。2kb的程序空间和128b的数据存储空间，可以完成数据的智能采集，并采用差分传输方式进行数据的传输。　　数据按帧进行传输，传输过程中采用CRC检验进行差错控制。
MSP430F2013的结构特点 　　
MSP430F2013是TI公司MSP430系列的一款微控制器， 它具有以下结构特点：16位的RISC CPU、16位的寄存器和常数发生器，可以获得很高的代码效率；五种低功耗模式，在便携式的测量应用中可以延长电池的使用寿命；数控振荡器（DCO）使得从低功耗模式切换到正常模式只要不到1μs；一个16位的定时器；10个I/O口；具备同步通信协议（SPI或者I2C）；一个16位的Σ-Δ ADC。 　　MSP430F2013的典型应用是传感系统捕获模拟信号，将模拟信号转换为数字信号，然后利用数字信号作屏幕显示或者将数字信号传输到一个主机系统中用作其他处理。
系统介绍 　　常见的模数转换电路对模拟信号要进行信号放大，而且一般都要设计一个与单片机的接口电路，本系统具有很高的集成度，单片即可完成信号的放大、模数转换，软件滤波，同时实现了一个单线协议，直接可以和高档计算机进行通讯，无须设计与单片机的接口电路。 　

 

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