原标题：On Semi NCN5150两线M-BUS总线收发解决方案

　　On Semi公司的NCN5150是用于两线M-BUS总线从设备和中继器的单片收发器,提供欧洲标准EN 13757-2和EN 1434-3的所有功能,UART通信速率高达38400波特,器件集成了3.3V VDD LDO稳压器,峰值电流15mA,可调整I/O电平,主要用在多种能源共用表, 电表,水表,气表和热力系统.本文介绍了NCN5150主要特性,框图,应用电路以及两种评估板NCN5150SOICGEVB和NCN5150QFNGEVB主要特性,电路图,材料清单和PCB布局图.

　　The NCN5150 is a single-chip integrated slave transceiver for use in two-wire Meter Bus (M-BUS) slave devices and repeaters. The transceiver provides all of the functions needed to satisfy the European Standards EN 13757-2 and EN 1434-3 describing the physical layer requirements for M-BUS. This particular version (NQFP version) includes a programmable power level of up to 6 unit loads, which are available for use in external circuits through a 3.3 V LDO regulator. The NCN5150 can provide communication up to the maximum M-BUS communication speed of 38,400 baud (half-duplex).

　　NCN5150主要特性:

　　• Single-chip MBUS Transceiver

　　• UART Communication Speeds Up to 38,400 baud

　　• Integrated 3.3 V VDD LDO Regulator with Extended Peak Current Capability of 15 mA

　　• Supports Powering Slave Device from the Bus or from External Power Supply

　　• Adjustable I/O Levels

　　• Adjustable Constant Current Sink up to 2 or 6 Unit Loads Depending on the Package

　　• Low Bus Voltage Operation

　　• Extended Current Budget for External Circuits: at least 0.88 mA

　　• Polarity Independent

　　• Power-Fail Function

　　• Fast Startup − No External Transistor Required on STC Pin

　　• Industrial Ambient Temperature Range of −40℃ to +85℃

　　• Available in:

　　♦ 16-pin SOIC (Pin-to-Pin Compatible with TSS721A)

　　♦ 20-pin QFN

　　• These are Pb-free Devices

　　NCN5150典型应用:

　　• Multi-energy Utility Meters

　　♦ Water

　　♦ Gas

　　♦ Electricity

　　♦ Heating systems

　　图1. NCN5150框图

　　图2. NCN5150通用应用电路图

　　图3. NCN5150采用外接电源的应用电路图

　　评估板NCN5150SOICGEVB和NCN5150QFNGEVB

　　The NCN5150SOICGEVB and NCN5150QFNGEVB evaluation boards demonstrate the NCN5150 M-BUS transceiver in SOIC and QFN package respectively. These evaluation boards include all external components needed for operating NCN5150 and demonstrate the small PCB surface area such an implementation requires.

　　评估板NCN5150SOICGEVB和NCN5150QFNGEVB主要特性:

　　• Single-chip MBUS Transceiver

　　• UART Communication Speeds Up to 38,400 baud

　　• Integrated 3.3 V VDD LDO Regulator with Extended Peak Current

　　• Capability of 15 mA

　　• Supports Powering Slave Device from the Bus or from External Power Supply

　　• Adjustable I/O Levels

　　• Adjustable Constant Current Sink up to 2 or 6 Unit Loads Depending on the Package

　　• Low Bus Voltage Operation

　　• Extended Current Budget for External Circuits: minimum 0.8 mA

　　• Polarity Independent

　　• Power-Fail Function

　　• Fast Startup − No External Transistor Required on STC Pin

　　• Industrial Ambient Temperature Range of −40℃ to +85℃

　　• Available in:

　　♦ 16-pin SOIC (Pin-to-Pin Compatible with TSS721A)

　　♦ 20-pin QFN

　　• These are Pb-free Devices

　　图4.评估板NCN5150SOICGEVB和NCN5150QFNGEVB外形图

　　评估板NCN5150QFNGEVB材料清单: