Maxim公司的MAXM22510/MAXM22511是隔離的RS-485/RS-422全雙工收發器模塊，在電纜邊（RS-485/RS-422驅動器/接收器邊）和UART邊提供2500VRMS（60秒）電隔離，集成的DC/DC電源給模塊的電纜邊供電，不需要外接元件.MAXM22510通信速率高達500kpbs，MAXM22511通信速率高達25Mbps，可用于工業4.0如工業自動化，可編邏輯控制器（PLC），HVAC，功率表和建筑物自動化。本文介紹了MAXM22510/1主要優勢和特性，功能框圖，應用電路，以及評估板MAXM22511 EVK主要特性，電路圖，材料清單和PCB設計圖。

　　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主要優勢和特性：

　　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應用：

　　Industrial Automation

　　Programmable Logic Controllers

　　HVAC

　　Power Meters

　　Building Automation

　　圖1.MAXM22510/1功能框圖

　　圖2.MAXM22510/1隔離全雙工RS-485/RS-422應用電路

　　圖3.MAXM22510/1典型隔離點對點應用框圖

　　圖4.MAXM22510/1典型應用電路圖

　　評估板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 evalu-ate the MAXM22511 alone or in a standard RS-485 con-figuration.

　　評估板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

　　圖5.評估板MAXM22511 EVK電路圖

　　評估板MAXM22511 EVK材料清單：

　　圖6.評估板MAXM22511 EVK PCB設計圖（1）：左：頂層絲印;右：頂層

　　圖7.評估板MAXM22511 EVK PCB設計圖（2）：左：底層;右：底層絲印

　　詳情請見：

　　https://datasheets.maximintegrated.com/en/ds/MAXM22510-MAXM22511.pdf

　　和https://datasheets.maximintegrated.com/en/ds/MAXM22511EVKIT.pdf

　　MAXM22510-MAXM22511.pdf