在不破坏电力预算的前提下提高绩效

　　在不破坏电力预算的前提下提高绩效

　　反映低功耗单片机制造商是全球的趋势，不断增加的压力驱动下的MCU的功耗下；当前的“底线”是100μ/兆赫

　　但是为什么对OEM来说这变得如此重要，更重要的是，这在实践中是如何实现的呢？IDMs做提供超低功率运行是什么？一个具有低功耗特性的器件选择仅仅是故事的一部分；同样重要的是如何实现单片机的CPU架构提供超低功率运行。

　　本文将在这一趋势看，检查仪器最近从德克萨斯解（msp430fr5720）、飞思卡尔（mkl15z128vlk4-nd，mkl25z128vlh4-nd）、NXP（lpc1100l），能源微（壁虎）、Atmel（UC3 L系列）和Silicon Labs（sim3lxx），看看现有的解决方案可能能够通过良好的设计技术实现超低功耗运行。

　　从OEM到8位到32位微控制器的迁移路径已经形成，到目前为止，在一个主要的中长期视图中，假定应用程序变得越来越复杂，因此，在某些时候，需要采用更强大的架构。

　　This argument is commonly simplified to ‘a rising level of complexity at the software level’， much of which is warranted; many of the efficiency gains made over recent years have been possible mainly through more sophisticated algorithms used in industrial control applications. In addition， greater levels of connectivity are now demanded by OEMs， which typically demands complex protocols. Few would argue that more powerful microcontrollers （MCUs） are able to integrate this complexity and connectivity with ease， providing significant benefits without the need for additional discrete devices.

　　Modern 32-bit architectures， once the domain of microprocessors， now enable a range of highly powerful and capable MCUs， characterized by the deployment of ARM®’s Cortex™-M family of cores in MCUs that can now cost as little as $0.50/each in production volumes. However， since their inception， 32-bit MCUs have faced stark resistance from the industry at large; resistance has systematically been eroded through developments and improvements in the 32-bit offerings. There are many things 32-bit devices can do better than their 8-bit counterparts.