I2C总线协议简介毕业文外文文献翻译.doc

翻译 THE INTRODUCE OF I2C-BUS PROTOCOL 1、THE I2C-BUS SPECIFICATION 1.1、Here are some of the features of the I2C-bus: ·?Only two bus lines are required; A serial data line (SDA)and a serial clock line (SCL). ·?Each device connected to the bus is software addressable by a unique address and simple master/slave relationships exist at all times; Masters can operate as master-transmitters or as master-receivers. ·It’s a true multi-master bus including collision detection and arbitration to prevent data corruption if two or more masters simultaneously initiate data transfer. 稴erial, 8-bit oriented, bi-directional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, or up to 3.4 Mbit/s in the High-speed mode. 稯n-chip filtering rejects spikes on the bus data line to preserve data integrity ·?The number of ICs that can be connected to the same bus is limited only by a maximum bus capacitance of 400 pF. 2、INTRODUCTION TO THE I2C-BUS SPECIFICATION For 8-bit oriented digital control applications, such as those requiring microcontrollers, certain design criteria can be established: ?A complete system usually consists of at least one microcontroller and other peripheral devices such as memories and I/O expanders ?The cost of connecting the various devices within the system must be minimized ?A system that performs a control function doesn抰 require high-speed data transfer ?Overall efficiency depends on the devices chosen and the nature of the interconnecting bus structure. To produce a system to satisfy these criteria, a serial bus structure is needed. Although serial buses don抰 have the throughput capability of parallel buses, they do require less wiring and fewer IC connecting pins. However, a bus is not merely an interconnecting wire, it embodies all the formats and procedures for communication within the system. Devices communicating with each other on a serial bus must have some form of protocol, which avoids all poss