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Evaluation Board User Guide
UG-146
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the ADE7878 Energy Metering IC
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 36
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.
EVALUATION BOARD CONNECTION DIAGRAM
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 REFERENCE
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
Figure 1.
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