Linear LTMR2882双路RS232 μModuleR收发方案

Linear 公司的LTMR2882是完全电绝缘的双路RS232 μModuleR收发器,不需要外接元件,绝缘电压2500VRMS,单电源3.3V或5V通过集成隔离的DC/DC转换器给接口两边供电.真正的RS232兼容输出电平,主要用在绝缘RS232接口,工业通信,测试和测量设备等.本文介绍LTMR2882主要特性, 方框图,各种应用电路以及LTMR2882演示板电路图.

The LTMR2882 is a complete galvanically isolated dual RS232 μModuleR transceiver. No external components are required. A single 3.3V or 5V supply powers both sides of the interface through an integrated, isolated DC/DC converter. A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply.

Coupled inductors and an isolation power transformer provide 2500VRMS of isolation between the line transceiver and the logic interface. This device is ideal for systems with different grounds, allowing for large common mode voltages. Uninterrupted  communication is guaranteed for common mode transients greater than 30kV/μs.

This part is compatible with the TIA/EIA-232-F standard. Driver outputs are protected from overload and can be shorted to ground or up to ±15V without damage. An auxiliary isolated digital channel is available. This channel allows confi guration for half-duplex operation by controlling the DE pin.
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