原标题：Maxim MAX78615+LMU能量测量Sonoma子系统参考设计

　　Maxim公司的MAX78615+LMU是隔离的能量测量处理器(EMP),用于负载监测和控制2线单相或多或三线分相(120/180°) AC电路.可提供多达两个灵活配置的传感器MAX78700和多个主接口,容易集成到任一种系统架构.主要用在建筑物自动化系统,逆变器和再生能源系统, Level 1和2 EV充电系统,家用电器和智能插座.本文介绍了MAX78615+LMU主要特性,框图, 以及能量测量Sonoma子系统参考设计主要特性和框图,电路图,材料清单和PCB元件布局图.

　　The MAX78615+LMU is an isolated energy measurement processor (EMP) for load monitoring and control of any 2-wire single-phase or 3-wire split-phase (120/180°) AC circuit. It provides flexible sensor configuration of up to two MAX78700 (four analog inputs) and numerous host interface options for easy integration into any system architecture.

　　The internal 24-bit processor and field upgradeable firmware performs all the necessary signal processing, compensation, and data formatting for accurate real-time measurement. Energy accumulation, alarm monitoring, and fault detection schemes minimize the overhead requirements of the host interface and/or network. The integrated flash memory also provides for nonvolatile storage of input configurations and calibration coefficients.

　　MAX78615+LMU主要特性:

　　• Utilizes MAX78700 Isolated Data Converter(s) and Resistive Sensors

　　• Flexible SPI, I2C, or UART Interface Options with Configurable I/O Pins for Alarm Signaling, Address Pins, or User Control

　　• Nonvolatile Storage of Calibration and Configuration Parameters

　　• Small 24-TQFN Package and Reduced Bill of Materials

　　• Internal or External Oscillator Timing References

　　• Quick Calibration Routines Minimize Manufacturing (System) Cost

　　MAX78615+LMU应用:

　　• Building Automation Systems (Commercial, Industrial)

　　• Inverters and Renewable Energy Systems

　　• Level 1 and 2 EV Charging Systems

　　• Grid-Friendly Appliances and Smart Plugs

　　图1. MAX78615+LMU框图

　　图2. MAX78615+LMU系统框图

　　隔离的能量测量子系统参考设计Sonoma (MAXREFDES14#)

　　AC measurement applications often require galvanic isolation to protect the More detailed image (JPG)system and user from high voltages. This is typically accomplished by either using bulky voltage/current transformers for sensors or by isolating the data and power interface to the measurement subsystem. These approaches, however, consume a considerable amount of space and come with hidden costs and design challenges.

　　The Sonoma (MAXREFDES14#) energy measurement subsystem reference design provides galvanic isolation from the system with a single pulse transformer while using resistors as the sensing elements. The result is a small, cost-optimized board.

　　图3. 能量测量子系统参考设计Sonoma外形图

　　The Sonoma design utilizes an isolated energy measurement processor (MAX78615+LMU); a multichannel, precision analog-to-digital converter (ADC) (MAX78700); a pulse transformer; optional 20MHz crystal oscillator, and the appropriate sense resistors for converting AC voltage and current into measurable signals. With the embedded load monitoring unit (LMU) firmware and nonvolatile storage of calibration and configuration data, Sonoma is a complete measurement subsystem ready for integration into any design.

　　Sonoma子系统参考设计主要特性:

　　Features

　　Applications

　　Lighting control systems

　　Commercial and industrial automation

　　Renewable energy systems

　　Electric vehicle charging systems

　　Smart home applications

　　Competitive Advantages

　　On-chip nonvolatile storage of calibration and configuration parameters

　　Full galvanic isolation with a single transformer

　　Small board size

　　Lower BOM cost

　　能量测量Sonoma子系统参考设计材料清单(BOM):