EVAL-ADE7878EB| Application Note
Preliminary Technical Data
FEATURES
Evaluation board designed to be used together with accompanying software to implement a fully functional three-phase energy meter Easy connection of various external transducers via screw terminals Easy modification of signal conditioning components using PCB sockets LED indicators on logic outputs CF1, CF2, CF3, IRQ0, and IRQ1 Optically isolated metering components and USB based communication with PC External voltage reference option available for on-chip reference evaluation PC COM port-based firmware updates
Evaluation Board Documentation ADE7878 Energy Metering IC EVAL-ADE7878EB
This documentation describes the ADE7878 evaluation kit hardware, firmware and software functionality. The evaluation board contains an ADE7878 and a LPC2368 microcontroller. 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 documentation, together with the ADE7878 data sheet provide a complete evaluation platform for the ADE7878. The evaluation board has been designed so that 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 (240Vrms) test circuit. On-board resistor dividers networks provide the attenuation for the line voltages. This application note describes how the current transducers should be connected for the best performance. The evaluation board requires two exter
nal 3.3V power supplies and the appropriate current transducers.
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.
IBN IBP P2 IAN IAP P1
VDD2 GND2 P10
MCU_VDD MCU_GND P12
P3 ICP ICN Filter Network INP INN P4
Optional External 1.2V Reference
ADE78xx
Digital Isolators
LPC2368
USB Port
P13 P15 ADR280
Optional External Clock In
Connector to PC COM Port JTAG Interface
Filter Network & Attenuation
P5 VN GND
P6 VCP GND
P7 VBP GND
P8 VAP GND
P9 VDD GND
J2 CF3
J3 CF2
J4 CF1
Figure 1. Functional Block Diagram
Rev. PrB
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 2009 Analog Devices, Inc. All rights reserved.
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