MAX78615+LMU

Isolated Energy Measurement Processor for Load Monitoring Units

Industry's Smallest Form Factor Solution Available for Embedded AC Measurement

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Overview

Best-in-Class Embedded Algorithms SupportHighly Accurate Electricity Measurements
- Voltage, Current and Frequency
- Active, Reactive, and Apparent Power/Energy
- Power Quality Measurements IncludingPeak Current and Harmonic Content
- Digital Temperature Compensation
Configurable Device Provides Design Flexibility
- Nonvolatile Storage of Calibration andConfiguration Parameters
- SPI, I²C, and UART Interface Options
- Configurable I/O Pins for Alarm Signaling, Address Pins, or User Control
Highly Integrated Features Support CompactDesigns and Reduced Bill of Materials
- Small 24-TQFN Package
- Internal or External Oscillator TimingReferences
- Remote ADC Interfaces Provide Cost-Effective and Reliable Isolation
- Quick Calibration Routines MinimizeManufacturing (System) Cost
- Digital Temperature Compensation

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.

Applications

Building Automation Systems (Commercial, Industrial)
Grid-Friendly Appliances and Smart Plugs
Inverters and Renewable Energy Systems
Level 1 and 2 EV Charging Systems

Documentation

Data Sheet 1

MAX78615LMU: Isolated Energy Measurement Processor for Load Monitoring Units Data Sheet (Rev.1) 01/19/2015

User Guide 2

UG-5750: Sonoma (MAXREFDES14#) ZedBoard Quick Start Guide 10/25/2013

UG-5749: Sonoma (MAXREFDES14#) LX9 Quick Start Guide 10/25/2013

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
MAX78700		Multichannel, Isolated, Precision ADC
Product 1
MAX78615+PPM		Isolated Energy Measurement Processor for Polyphase Monitoring Systems

Reference Designs

Figure 1. The Sonoma subsystem design block diagram.

Isolated Energy Measurement Subsystem Reference Design

View Detailed Reference Design

Features and Benefits

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

Features

High-accuracy power measurement
High-voltage galvanic isolation
Preset gain/offset parameters
On-board 4mΩ current sensing resistor with a good temperature coefficient
On-board voltage sensing resistor divider with a ratio of 2667:1 with good temperature coefficient
Universal AC input voltage range from 90 to 264VAC
Pluggable terminals for AC (8A max)
Small printed-circuit board (PCB) area
Device drivers
Example C source code
Configuration files for Xilinx^® LX9 and ZedBoard^™ platforms
Pmod^™-compatible form factor

Part Used