【产品】数据传输速率12Mbps的半双工RS485/RS422收发器UN3485，最多允许256个器件连接到总线

时间： 2021-07-18 来源：优恩半导体

技术问答

优恩半导体 UN3485是用于RS-485/RS-422通信的半双工高速收发器，包括一个驱动器和一个接收器，两者均可独立使能与关闭。当两者均禁用时，驱动器与接收器均输出高阻态。具有1/8单位负载，允许256个UN3485收发器并接在同一通信总线上，可实现高达12Mbps的无差错数据传输。该芯片的工作电压范围为3.0~3.6V，具备失效安全（fail-safe）、过温保护、限流保护、过压保护等功能。

图1 产品外形图和引脚分布图

UN3485有总线式组网、手拉手式组网以及总线端口防护三种典型应用电路。

1）总线式组网

UN3485RS485收发器设计用于多点总线传输线上的双向数据通信。图2显示了典型网络应用电路。这些器件也能用作电缆长于4000英尺的线性转发器，为减小反射，应当在传输线两端以其特性阻抗进行终端匹配，主干线以外的分支连线长度应尽可能短。

图2 典型的RS485半双工通讯网络

2）手拉手式组网

手拉手式组网又称菊花链拓扑结构，是RS485总线布线的标准及规范，是TIA等组织推荐使用的RS485总线拓扑结构。其布线方式就是主控设备与多个从控设备形成手拉手连接方式，如图3所示，不留分支才是手拉手的方式。这种布线方式，具有信号反射小，通讯成功率高等优点。

图3 手拉手式 RS485 半双工通讯网络

3 ）总线端口防护

在恶劣的环境下，RS485通讯端口通常都做好静电防护、雷击浪涌防护等额外的防护，甚至还需要做好防止380V市电接入的方案，以避免智能仪表、工控主机的损坏。图4为常见的3种RS485总线端口防护方案。第一种为AB端口分别并联TVS器件到保护地，AB端口之间并联TVS器件、AB端口分别串联热敏电阻、并接气体放电管到保护地形成三级保护的方案；第二种为AB分别并联TVS到地、串联热敏电阻，AB之间并联压敏电阻的三级防护方案；第三种为AB分别接上下拉电阻到电源与地，AB之间接TVS，A或B某一端口接热敏电阻的方案。

图4 总线端口防护应用电路

产品特点：

●3.3V电源供电，半双工；

●1/8单位负载，允许最多256个器件连接到总线；

●驱动器短路输出保护；

●过温保护功能；

●低功耗关断功能；

●接收器开路失效保护；

●具有较强的抗噪能力；

●集成的瞬变电压抵制功能；

●在电噪声环境中的数据传输速率可达到12Mbps；

应用领域：

●点对点、点对多点通讯；

●工业控制自动化；

●安防系统；

●智能仪表；

●道路交通控制自动化；

●楼宇自控系统；

●景光照明控制系统；

●电平转换器；

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本文由闯天涯转载自优恩半导体，原文标题为:3.3V 供电，256 节点，12Mbps 半双工 RS485/RS422 收发器，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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选型指南 - 优恩半导体 - 2021 PDF 中文下载

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选型指南 - 优恩半导体 - 2021 PDF 英文下载