Linear LTC2870多模式RS232(RS485)收发解决方案
Linear公司的LTC2870/LTC2871是多模式RS232/RS485收发器,支持RS232,RS485和RS422协议,工作电压3V-5.5V. LTC2870可配置成两个单端RS232收发器重或一个差分RS485,而LTC2871提供两个RS232收发器和一个RS485收发器的独立控制.主要用在灵活的RS232/RS485/RS422接口,软件选择的多协议接口端,POS终端,电缆中继器和协议转换器.本文介绍了LTC2870/LTC2871主要特性,方框图以及各种通信配置框图.
LTC2870/71:RS232/RS485 Multiprotocol Transceivers with Integrated Termination
The LTC2870/LTC2871 are robust pin-configurable multiprotocol transceivers, supporting RS232, RS485, and RS422 protocols, operating on a single 3V to 5.5V supply. The LTC2870 can be configured as two RS232 single-ended transceivers or one RS485 differential transceiver on shared I/O lines. The LTC2871 offers independent control of two RS232 transceivers and one RS485 transceiver, each on dedicated I/O lines.
Pin-controlled integrated termination resistors allow for easy interface reconfiguration, eliminating external resistors and control relays. Half-duplex switches allow four-wire and two-wire RS485 configurations. Loopback mode steers the driver inputs to the receiver outputs fordiagnostic self-test.The RS485 receivers support up to 256 nodes per bus, and feature full failsafe operation for floating, shorted or terminated inputs.
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