整个测量过程用伪代码表示如下。
int measure (void)
{
int i；
if ( SET==1 )
{
调整增益；
}
For (i=0;i<10;i++)
{
等待转换结果产生；
读取并保存转换结果；
}
累加转换结果；
查找最大值与最小值；
中位值平均滤波；
返回测量结果；
}
数据传输
数据发送按帧发送，
每帧数据包括同步码，AD转换结果和检验码，帧的同步可以采用特定的同步码或者间隙同步，这里采用第二种方法。在数据帧发送时，首先拉高数据发送线，拉高的时间为发送16个数据位的时间，帧头高电平的间隙用作数据帧的同步。
奇偶校验码作为一种检错码虽然简单,但是漏检率太高。在计算机网络和数据通信中用得最广泛的检错码,是一种漏检率低得多也便于实现的循环冗余码CRC。CRC生成多项式阶数越高，误判的概率越小。本文采用CCITT-16，其生成多项式为g(x)=x16+x15+x5+1。实现CRC的方法一般有两种：直接计算和查表。由于查表法至少需要1kb的空间用来存储表值，所以这里采用直接计算的方法。
数据传输时使用单线串行输出，用口线模拟串行发送，发送字节时在口线上依次发送如图4所示数据（数据为0时拉低口线电平，数据为1时拉高口线电平），位持续时间根据波特率计算，本应用中设定波特率为9600b/s。当没有数据发送时，输出口线上维持高电平。
数据发送最后通过光耦隔离，使得现场和数据的输出隔离，同时可以根据后级系统输入的需要简单地更改电路。
结束语 经过实际应用，单片MSP430F2013可实现小信号 传感器 输出电平测量，转换时间小于1ms。并可实现低功耗测量，整机功耗不超过6mW。该系统特别适合于实现了一个智能传感器，当输入信号满辐度大于40mV时可以保证16位A/D转换分辨率。由于采用半双工的差分传输，可以方便地实现传感器的组网。
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