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微控制器外围设备:在嵌入式应用中使用USB的技巧

消耗积分:0 | 格式:rar | 大小:0.20 MB | 2017-07-03

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  微控制器外围设备:在嵌入式应用中使用USB的技巧

  同样的简单性和通用性使通用串行总线(USB)成为一种流行的计算机和消费应用互连技术,也在嵌入式世界中赢得了球迷的青睐。在下一个嵌入式设计中实现USB的最佳方式是什么?使用集成USB接口或单独控制器的MCU更好吗?不同的解决方案对MCU的存储和处理能力有不同的要求吗?如何减少设计的足迹、功耗和BOM成本?是否有任何硬件或软件诀窍可以提高其性能或能源效率?我们将在本文中讨论这些和其他嵌入式设计问题。

  让我们从要点开始。

  嵌入式USB

  在90年代后期,随着大多数PC机开始安装USB端口的台式机,USB开始受到嵌入式开发者的欢迎。MCU厂商很快意识到USB的数据率更高,常用的电缆,并有能力提供适量的权力是一个方便的替代电传时代串行接口(RS232,UART,等)和繁琐的JTAG端口连接程序,监控,并与他们交流发展平台。大多数MCU制造商很快采用USB作为其评估平台和开发包的主要接口(图1)。

  

  Figure 1: The USB interface has made it possible for MCU/DSC makers to offer stand-alone development kits that can be configured, managed, and powered by a single PC connection (a)。 In most cases, additional power supplies are only necessary for higher-powered applications, such as lighting or motor control (b)。 (Courtesy of Microchip Technologies.)

  Meanwhile, USB moved quickly beyond its initial role as a computer peripheral connection (mice, printers, webcams) to become an important interface in many consumer, commercial, and industrial applications. Its ability to serve as a consistent, readily available power source and data connection has made it a near-universal feature on mobile phones, cameras, media players and other handheld consumer products. Because USB also allows any PC to serve as a control panel to handle data access, configuration management, and firmware updates, it’s become the connection of choice for everything from glucose meters and fitness equipment to industrial dataloggers.

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