原标题：Maxim MAXM22510－1RS－485(422)全双工收发器模块解决方案

　　Maxim公司的MAXM22510/MAXM22511是隔离的RS-485/RS-422全双工收发器模块,在电缆边(RS-485/RS-422驱动器/接收器边)和UART边提供2500VRMS(60秒)电隔离,集成的DC/DC电源给模块的电缆边供电,不需要外接元件.MAXM22510通信速率高达500kpbs,MAXM22511通信速率高达25Mbps,可用于工业4.0如工业自动化,可编逻辑控制器(PLC),HVAC,功率表和建筑物自动化.本文介绍了MAXM22510/1主要优势和特性,功能框图,应用电路,以及评估板MAXM22511 EVK主要特性,电路图,材料清单和PCB设计图.

　　The MAXM22510 and MAXM22511 isolated RS-485/ RS-422, full-duplex, transceiver modules provide 2500VRMS (60s) of galvanic isolation between the cable-side (RS-485/RS-422 driver/receiver side) and the UART-side of the device. An integrated DC-DC powers the cable-side of the module. No external components are required.

　　Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 500kpbs (MAXM22510) and 25Mbps (MAXM22511).

　　The MAXM22510/MAXM22511 operate from a single 3.3V supply on the UART-side. An integrated DC-DC converter generates the 3.3V operating voltage for the cable-side of the module.

　　The devices include one drive channel and one receive channel. The receiver is 1/4-unit load, allowing up to 128 transceivers on a common bus. Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when cable-side or UART-side power supplies are below functional levels.

　　The driver outputs and receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable-side, as specified by the Human Body Model (HBM).

　　The MAXM22510/MAXM22511 are available in an LGA 44-pin package and operate over the -40℃ to +105℃ temperature range.

　　MAXM22510/1主要优势和特性:

　　Space Saving Solution Fully Integrated Module for Compact Design

　　High-Performance Transceiver Enables Flexible Designs Integrated DC-DC for Cable-Side Power

　　Compliant with RS-485 EIA/TIA-485 Standard

　　500kpbs Maximum Data Rate for the MAXM22510

　　25Mbps Maximum Data Rate for the MAXM22511

　　Allows Up to 128 Devices on the Bus

　　Integrated Protection Ensures for Robust Communication ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs

　　2.5kVRMS Withstand Isolation Voltage for 60 Seconds (VISO)

　　630VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)

　　445VRMS Maximum Working-Isolation Voltage (VIOWM)

　　Withstands ±10kV Surge per IEC 61000-4-5

　　Thermal Shutdown

　　Safety Regulatory Approvals Pending

　　UL According to UL1577

　　cUL According to CSA Bulletin 5A

　　MAXM22510/1应用:

　　Industrial Automation

　　Programmable Logic Controllers

　　HVAC

　　Power Meters

　　Building Automation

　　图1.MAXM22510/1功能框图

　　图2.MAXM22510/1隔离全双工RS-485/RS-422应用电路

　　图3.MAXM22510/1典型隔离点对点应用框图

　　图4.MAXM22510/1典型应用电路图

　　评估板MAXM22511 EVK

　　The MAXM22511 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the functionality of the MAXM22511 isolated RS-485/RS-422 transceiver module. The EV kit operates from a single 3.3V supply.

　　The EV kit is a fully assembled and tested circuit board for evaluating the MAXM22511 isolated RS-485/RS-422 transceiver module (U1). The EV kit is designed to evalu­ate the MAXM22511 alone or in a standard RS-485 con­figuration.

　　评估板MAXM22511 EVK主要特性:

　　Operates From a Single 3.3V Supply

　　Terminal Block Connectors for Easy RS-485/RS-422 Evaluation

　　Up to 2500VRMS Isolation for 60s

　　Fully Assembled and Tested

　　图5.评估板MAXM22511 EVK电路图

　　评估板MAXM22511 EVK材料清单: