使用高效率SPI外圍設備的低成本基于MCU的物聯網設計

　　物聯網的高效設計必須平衡一系列相互矛盾的要求。低成本是重要的，但通常支持應用程序所需的所有關鍵功能，增加MCU引腳計數和內存大小的兩件事情，反對低成本。低功耗也是重要的物聯網應用電池操作是必須的。添加功能和提高性能可以提高電力需求，但是。清楚地找到所有這些要求之間的平衡可能是一個問題，但這只是工程師的挑戰，從尖端設計的類型。

　　一把這設計Gordian結的最有效的方法是尋找系統架構的變化，不同的框架問題。例如，有效地使用串行接口，可以減少MCU所需的引腳數量，并有助于優化電路板的空間，功耗和性能。高效利用單片機SPI外設就可以做到這一點。本文將展示一些說明物聯網應用程序的例子，SPI風格的外設提供了新的架構選項，極大地提高效率。

　　SPI connectivity in cost-oriented embedded designs

　　One of the most difficult tasks when designing cost-oriented systems is to balance functionality and cost. In MCU-based designs， this conundrum can often manifest itself in the need to add extra pins to the MCU so that additional peripherals can be added to the system. The extra functionality the peripherals provide are important differentiators that， hopefully， make the design more valuable to the user than a design that uses just the standard MCU. After all， the MCU with no external peripherals can be very difficult to differentiate from another MCU-based design.

　　And while it is true that in many MCU-based designs it’s the software that differentiates one design from another， it’s often the case that an innovative combination of software and external hardware is much more compelling. This can be even more important in cost-oriented designs where increasing the value to the user is more important than just keeping the cost low. In the fast growing and competitive IoT market finding the right value will be critical to product success.