传感器循环依赖正确的数据转换器

　　传感器循环依赖正确的数据转换器。

　　随着环境传感器在消费者和工业应用中的日益广泛，传感器选择正确的数据类型越来越重要。大多数工业系统都是在线路电压下工作的，因此有足够的能量进行信号处理，从而使低噪声地板成为可能。这使得能够使用更高分辨率转换器和更大的信号处理参考电压传感器。这些较大的范围允许获得和跟踪更多的数据位。

　　另一方面，消费者系统正逐渐转向电池操作，因此存在功率限制，限制了数据转换过程的精度和速度。了解转换器子系统的各种类型，以及它们如何影响传感器数据，是设计实时M2M系统的关键。

　　Understanding data conversion

　　The first step in implementing a sensor system for monitoring and control applications is to understand what sort of data is needed for the system. In most cases， the sensor produces an analog signal as an output. A microcontroller or other， digital logic-based system must process this signal. In order to control a closed-loop system， these logic- and microcontroller-based cores need to have their output converted from digital back to analog in order to drive mechanical systems.

　　A common misperception is that the resolution of the data converter should be the same as the word size of the microcontroller – 8 bits for an 8-bit micro， 16 bits for a 16-bit micro， etc. However， this not the case. The resolution of the data converter should complement the type and size of the signal measured， as well as the sensitivity of the system to the voltage or current levels of the LSB （least significant bit） of the output from the data converter.