在物联网设计中管理多标准连接要求

在物联网设计中管理多标准连接要求   　　随着物联网的发展，标准定义最佳的无线连接方案的物联网仍然是难以捉摸的。对于物联网设备开发商，这转化为重大风险，因为选择错误的标准将大大降低市场机会。然而，试图迎合所有可能的标准导致过于复杂的设计，增加成本和延迟项目。从德克萨斯文书和NXP多标准无线单片机的出现，开发商已经有效地满足新兴物联网的连接要求的可行方案。   　　多年来，无线系统的设计在很大程度上仍然是射频专家的专属领域。对于新的RF设计工程师，优化发送功率和接收器灵敏度的要求通常增加一个应用程序的显着复杂性。这往往导致权衡的整体功能，同时延长项目进度。   　　   　　The emergence of wireless MCUs has brought about dramaTIc change in the development of connected applicaTIons， and may even have catalyzed the vision of the IoT itself. By integraTIng a processor and RF transceiver on a single chip， these system-on-chip （SoC） devices have democraTIzed wireless systems design. Rather than juggling the myriad issues related to RF design， engineers can take full advantage of optimized wireless communications functionality built into these devices by the semiconductor vendor‘s own RF experts. Instead of losing time optimizing this critical， yet non-differentiated part of their design， developers can focus on applying wireless connectivity in their own applications.   　　The Texas Instruments CC2650 MCU takes integrated support for connectivity even further， combining an ARM Cortex?-M3-based host with a complete on-chip communications subsystem （Figure 1）。 Here， the host processor runs the primary application and the high-level protocol stack from its boot ROM and integrated flash. When the application requires a communications event， the host processor only needs to send high-level requests to the communications subsystem. In turn， that subsystem’s dedicated ARM Cortex-M0 core converts those high-level requests into specific communications tasks and uses integrated RF functionality to execute the detailed transactions required to fulfill them.