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MAX78615-LMU-A01T: 产品描述Metering Systems on a Chip - SoC Iso Measurement Processor for LMU; 产品类别半导体嵌入式处理器和控制器; 文件大小757KB，共63页; 制造商Maxim(美信半导体); 官网地址https://www.maximintegrated.com/en.html

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MAX78615-LMU-A01T概述

Metering Systems on a Chip - SoC Iso Measurement Processor for LMU

MAX78615-LMU-A01T规格参数

参数名称	属性值
Product Attribute	Attribute Value
制造商 Manufacturer	Maxim(美信半导体)
产品种类 Product Category	Metering Systems on a Chip - SoC
RoHS	Details
安装风格 Mounting Style	SMD/SMT
封装 / 箱体 Package / Case	TQFN-24
Core	EMP
Data Bus Width	24 bit
Maximum Clock Frequency	20 MHz
Program Memory Size	8 kB
Data RAM Size	1.5 kB
ADC Resolution	No ADC
工作电源电压 Operating Supply Voltage	3.3 V
最小工作温度 Minimum Operating Temperature	- 40 C
最大工作温度 Maximum Operating Temperature	+ 85 C
系列 Packaging	Cut Tape
系列 Packaging	Reel
Program Memory Type	Flash
Data RAM Type	RAM
接口类型 Interface Type	I2C, SPI, UART
Development Kit	MAXREFDES14#
NumOfPackaging	2
工厂包装数量 Factory Pack Quantity	2500

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MAX78615+LMU

Isolated Energy Measurement Processor

for Load Monitoring Units

GENERAL DESCRIPTION

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.

BENEFITS AND FEATURES

•

Best-in-Class Embedded Algorithms Support

Highly Accurate Electricity Measurements

•

Voltage, Current and Frequency

•

Active, Reactive and Apparent

Power/Energy

•

Power Quality Measurements including

Peak Current and Harmonic Content

•

Digital Temperature Compensation

Configurable Device Provides Design Flexibility

•

Nonvolatile Storage of Calibration and

Configuration Parameters

•

SPI, I C, and UART Interface Options

•

Configurable I/O Pins for Alarm Signaling,

Address Pins, or User Control

Highly Integrated Features Support Compact

Designs and Reduced Bill of Materials

•

Small 24-TQFN Package

•

Internal or External Oscillator Timing

References

•

Remote ADC Interfaces Provide Cost-

Effective and Reliable Isolation

•

Quick Calibration Routines Minimize

Manufacturing (System) Cost

•

Digital Temperature Compensation

•

APPLICATIONS

•

Building Automation Systems (Commercial, Industrial)

Inverters and Renewable Energy Systems

Level 1 and 2 EV Charging Systems

Grid-Friendly Appliances and Smart Plugs

•

Measurement

Processor

MAX78700

Pulse

XFMR

Interface

UART

Host

Interface

Load

Relay(s)

RAM

SPI

Digital

I/O

MAX78700

FLASH

MAX78615+LMU

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-6571; Rev 2; 1/15

MAX78615+LMU Data Sheet

Table

of Contents

ABSOLUTE MAXIMUM RATINGS ...........................................................................................................................5

RECOMMENDED EXTERNAL COMPONENTS .........................................................................................................5

RECOMMENDED OPERATING CONDITIONS .........................................................................................................5

PERFORMANCE SPECIFICATIONS ..........................................................................................................................6

Pin Configuration ................................................................................................................................................... 9

Package Information ...........................................................................................................................................10

On-Chip Resources Overview ............................................................................................................................... 11

Block Diagram .....................................................................................................................................................11

Clock Management .............................................................................................................................................12

Power-On and Reset Circuitry ............................................................................................................................13

Watchdog Timer .................................................................................................................................................13

Pulse Transformer Interface ...............................................................................................................................14

24-Bit Energy Measurement Processor (EMP) ...................................................................................................14

Flash and RAM .........................................................................................................................................14

Multipurpose DIOs..............................................................................................................................................14

Communication Interface ........................................................................................................................14

Functional Description and Operation ................................................................................................................. 15

Measurement Interface ......................................................................................................................................15

AFE Input Multiplexer ..............................................................................................................................15

High Pass Filters and Offset Removal.......................................................................................................16

Gain Correction ........................................................................................................................................17

Die Temperature Compensation..............................................................................................................17

Phase Compensation ...............................................................................................................................18

Voltage Input Configuration.....................................................................................................................19

Current Input Configuration ....................................................................................................................21

Data Refresh Rates .............................................................................................................................................23

Scaling Registers .................................................................................................................................................23

Calibration Routines ...........................................................................................................................................24

Voltage and Current Gain Calibration ......................................................................................................24

Offset Calibration .....................................................................................................................................24

Die Temperature Calibration ...................................................................................................................24

Voltage Channel Measurements ........................................................................................................................25

Quadrature Voltage .................................................................................................................................25

Voltage Frequency ...................................................................................................................................25

Peak Voltage ............................................................................................................................................25

RMS Voltage .............................................................................................................................................26

Current Channel Measurements ........................................................................................................................26

Peak Current ............................................................................................................................................26

RMS Current .............................................................................................................................................27

Crest Factor ..............................................................................................................................................27

Power Calculations .............................................................................................................................................28

Active Power (P) .......................................................................................................................................28

Reactive Power (Q) ..................................................................................................................................29

Apparent Power (S) ..................................................................................................................................29

Power Factor (PF) .....................................................................................................................................29

Fundamental and Harmonic Calculations ...........................................................................................................30

Energy Calculations.............................................................................................................................................31

Bucket Size for Energy Counters ..............................................................................................................31

Min/Max Tracking ...............................................................................................................................................33

Alarm Monitoring ...............................................................................................................................................34

Rev 2

MAX78615+LMU Data Sheet

Status Registers ..................................................................................................................................................36

Digital IO Functionality .......................................................................................................................................37

DIO Polarity ..............................................................................................................................................37

Multipurpose (MP) Pins ...........................................................................................................................38

Command Register .............................................................................................................................................39

Normal Operation ....................................................................................................................................39

Calibration Command ..............................................................................................................................39

Save to Flash Command ...........................................................................................................................40

Erase Flash Command ..............................................................................................................................40

Control Register ..................................................................................................................................................40

Configuration Register ........................................................................................................................................40

Register Access .................................................................................................................................................... 42

Data Types ..........................................................................................................................................................42

Register Locations ...............................................................................................................................................43

Serial Interfaces ................................................................................................................................................... 48

UART Interface ....................................................................................................................................................48

RS-485 Support ........................................................................................................................................48

Device Address Configuration ..................................................................................................................49

SSI Protocol Description ...........................................................................................................................50

SPI Interface ........................................................................................................................................................54

I C Interface ........................................................................................................................................................57

Device Address Configuration ..................................................................................................................58

Bus Characteristics ...................................................................................................................................59

Device Addressing ....................................................................................................................................59

Write Operations .....................................................................................................................................60

Read Operations ......................................................................................................................................61

Ordering Information........................................................................................................................................... 62

Contact Information ............................................................................................................................................ 62

Revision History ................................................................................................................................................... 63

Rev 2

MAX78615+LMU Data Sheet

Table of Figures

Figure 1. SPI Timing ......................................................................................................................................... 7

Figure 2. I C Timing .......................................................................................................................................... 8

Figure 3. TQFN Package Pinout ....................................................................................................................... 9

Figure 4. Block Diagram ................................................................................................................................. 11

Figure 5. Crystal Connections ........................................................................................................................ 12

Figure 6. Connecting the

RESET

Pin ............................................................................................................. 13

Figure 7. Defining Source Voltages................................................................................................................ 19

Figure 8. Computing Source Voltage ............................................................................................................. 19

Figure 9. Voltage Input Flowchart ................................................................................................................. 20

Figure 10. Current Input Configuration ......................................................................................................... 21

Figure 11. Computing Input Current ............................................................................................................. 21

Figure 12. Current Input Flowchart ............................................................................................................... 22

Figure 13. Peak Voltage Measurement ......................................................................................................... 25

Figure 14. RMS Voltage Measurement ......................................................................................................... 26

Figure 15. Peak Current Measurement ......................................................................................................... 26

Figure 16. RMS Current Measurement ......................................................................................................... 27

Figure 17. Active Power Measurement ......................................................................................................... 28

Figure 18. Reactive Power Measurement ..................................................................................................... 29

Figure 19. Apparent Power Measurement .................................................................................................... 29

Figure 20. Min/Max Tracking ........................................................................................................................ 33

Figure 21. Measuring Voltage Sag ................................................................................................................. 35

Figure 22. Relay Control ................................................................................................................................ 38

Figure 23. Configuring for RS-485 ................................................................................................................. 48

Figure 24. Device Address Configuration ...................................................................................................... 49

Figure 25. SSI Protocol Description ............................................................................................................... 50

Figure 26. Master Packet Structure ............................................................................................................... 50

Figure 27: Signal Timing on the SPI Bus ......................................................................................................... 54

Figure 28: Single Word Read Access Timing .................................................................................................. 55

Figure 29: Single Word Write Access Timing ................................................................................................. 56

Figure 30. Connecting the I C Interface......................................................................................................... 57

Figure 31. I C Device Address Configuration ................................................................................................. 58

Figure 32. I C Fundamental Bus Characteristics ............................................................................................ 59

Figure 33. I C Device Addressing ................................................................................................................... 59

Figure 34. I C Write Operation ...................................................................................................................... 60

Figure 35. I C Multiple Write Operation........................................................................................................ 60

Figure 36. I C Read Operation ....................................................................................................................... 61

Figure 37. Setting the Register Address Pointer............................................................................................ 61

Figure 38. I C Multiple Read Operation......................................................................................................... 61

Rev 2

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