1-Wire总线驱动电路设计

针对1-Wire总线与主控制器直接连接时主控制器I/O端口驱动能力不足,限制传感器数量和传输距离的问题,设计了一种由线驱动器及与门电路组成的驱动电路.通过简单的程序设计,即可实现1-Wire总线数据的双向传输和驱动.该驱动电路在不增加单片机资源占用的情况下,可由一路1-Wire总线分离为多路独立的总线,并完全兼容于其协议标准,使1-Wire总线可驱动的传感器数量和传输距离有了极大的提高.本电路具有结构简单、易于扩展的特点,不仅可应用于由DS18B20组成的温度测量系统中,也适用于对其它1-Wire器件的驱动,对1-Wire总线系统的设计应用具有帮助和促进作用.

Bus Driver Circuit Design For 1-Wire

When connecting the 1-Wire bus with main controller directly, the driving ability of I/O port of main controller is weak, and the number of sensors and the transmission distance are limited. Aiming at this problem, a driving circuit composed of line driver and gate circuit was designed. The bi-directional transmission and driving of 1-Wire can he achieved by simple programming. Without additional resource occupation of chip-microcomputer, the driving circuit can separate 1-Wire bus into multi-path individual buses and be compatible with the protocol standard completely. In addition, the number of sensors and the transmission distance can he enhanced greatly. The circuit has simple structure and can he extended easily, which can not only be used in the temperature measuring system composed of DS18B20, hut also he used in the driving of other 1-Wire devices. It is helpful for the design and application of 1-Wire bus.