ANALOG DEVICES UG-146 Service Manual

Evaluation Board User Guide

ADE78xx

P1P2

P3

P4

P5 P6 P7 P8 P9

IAPIANIBP

IBN

ICP
ICN

INP
INN

GNDVN GNDVCP GNDVBP GNDVAP GNDVDD

FILTER

NETWORK

FILTER NETWORK

AND ATTENUATION

ADR280

OPTIONAL EXTERNAL

1.2V REFERE NCE

OPTIONAL
EXTERNAL
CLOCK IN

DIGITAL

ISOLATORS

LPC2368

P10

GND2VDD2

P12

MCU_GNDMCU_VDD

USB PORT

J2 J3 J4

CF3 CF2 CF1

P13

JTAG

INTERFACE

P15

CONNECTOR TO

PC COM PORT

09078-001

UG-146

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: [phone] • Fax: [phone] • www.analog.com

Evaluating the ADE7878 Energy Metering IC

FEATURES

Evaluation board designed to be used with accompanying

software to implement a fully functional 3-phase energy

meter
Easy connection of external transducers via screw terminals
Easy modification of signal conditioning components using

PCB sockets
LED indicators on the CF1, CF2, CF3, IRQ0, and IRQ1 logic

outputs
Optically isolated metering components and USB-based

communication with a PC
External voltage reference option available for on-chip

reference evaluation
PC COM port-based firmware updates

GENERAL DESCRIPTION

The ADE7878 is a high accuracy, 3-phase electrical energy
measurement IC with serial interfaces and three flexible pulse
outputs. The ADE7878 incorporates seven ADCs, reference
circuitry, and all signal processing required to perform total
(fundamental and harmonic) active, reactive, and apparent
energy measurement, fundamental active and reactive energy
measurement, and rms calculations.

This user guide describes the ADE7878 evaluation kit hardware,
firmware, and software functionality. The evaluation board
contains an ADE7878 and a LPC2368 microcontroller (from
NXP Semiconductors). The ADE7878 and its associated
metering components are optically isolated from the
microcontroller. The microcontroller communicates with the
PC using a USB interface. Firmware updates can be loaded
using one PC com port and a regular serial cable.

The ADE7878 evaluation board and this user guide, together
with the ADE7878 data sheet, provide a complete evaluation
platform for the ADE7878.

The evaluation board has been designed so that the ADE7878
can be evaluated in an energy meter. Using appropriate current
transducers, the evaluation board can be connected to a test
bench or high voltage (240 V rms) test circuit. On-board
resistor divider networks provide the attenuation for the line
voltages. This user guide describes how the current transducers
should be connected for the best performance. The evaluation
board requires two external 3.3 V power supplies and the
appropriate current transducers.

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITI ONS.

EVALUATION BOARD CONNECTION DIAGRAM

Rev. 0 | Page 1 of 36

Figure 1.