EVAL-ADE7878EBZ Analog Devices Inc, EVAL-ADE7878EBZ Datasheet

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EVAL-ADE7878EBZ

Manufacturer Part Number
EVAL-ADE7878EBZ
Description
Energy Meter Eval. Board
Manufacturer
Analog Devices Inc
Datasheet

Specifications of EVAL-ADE7878EBZ

Silicon Manufacturer
Analog Devices
Application Sub Type
Energy Meter
Kit Application Type
Data Converter
Silicon Core Number
ADE7878
Features
External Transducers, LED Indicators, Logic Outputs
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
Q4472972
Q4684026
Q5015773
Preliminary Technical Data
FEATURES
Evaluation board designed to be used together with
Easy connection of various external transducers via screw
Easy modification of signal conditioning components using
LED indicators on logic outputs CF1, CF2, CF3, IRQ0, and
Optically isolated metering components and USB based
External voltage reference option available for on-chip
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.
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.
accompanying software to implement a fully functional
three-phase energy meter
terminals
PCB sockets
IRQ1
communication with PC
reference evaluation
ICP
ICN
INP
INN
P3
P4
P2
P5
Optional External
1.2V Reference
IBN
VN
Filter Network
IBP
GND
ADR280
P6
IAN
Filter Network & Attenuation
VCP
IAP
GND
P1
P7
VBP
GND
ADE78xx
Figure 1. Functional Block Diagram
P8
VAP
GND
Optional External
Clock In
Evaluation Board Documentation
P9
VDD
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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 external 3.3V power supplies and the
appropriate current transducers.
GND
ADE7878 Energy Metering IC
VDD2
Isolators
Digital
GND2
P10
J2
CF3
MCU_VDD
©2009 Analog Devices, Inc. All rights reserved.
EVAL-ADE7878EB
LPC2368
J3
CF2
MCU_GND
P12
PC COM Port
Connector to
P15
J4
CF1
USB Port
Interface
JTAG
P13
www.analog.com

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EVAL-ADE7878EBZ Summary of contents

Page 1

... 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 ...

Page 2

... Current Sense Inputs (P1, P2, P3, and P4 Connectors) ...... 3 Using a Current Transformer as the Current Sensor .......... 3 Votage Sense Inputs (P5, P6, P7, and P8 Connectors) ........ 4 Setting Up the Evaluation Board as an Energy Meter ............. 5 Activating Serial Communication ADE7878 − LPC2368 .. 7 Using the Evaluation Board with another microcontroller 7 ADE7878 Evaluation Software ................................................... 7 Installing the ADE7878 Software ...

Page 3

... A). The other two phases and the neutral current requires similar connections. P1 IAP IAN Figure 2. Phase A Current Input Structure on Evaluation Board Imax=6 Arms CT P1 1:2000 Figure 3. Example of a Current Transformer Connection The burden resistors R1 and R2 have to be chosen function of current transformer ratio and maximum current of the system ...

Page 4

... P8 VAP P5 VN Figure 4. Phase A Voltage Input Structure On Evaluation Board The maximum signal level permissible at VAP, VBP and VCP pins of ADE7878 is 0.5V peak. Although ADE7878 analog inputs can withstand ±2V without risk of permanent damage, the signal range should not exceed ±0.5V with respect to AGND for specified operation ...

Page 5

... The driver is found in VirCOM_Driver_XP folder of the CD. After the driver has been installed, the supplied evaluation software can be launched. The next section describes the ADE7878 evaluation software in detail and how it can be installed and uninstalled. Rev. PrB | Page EVAL-ADE7878EB ...

Page 6

... VAP P7 R27 R30 VBP P6 R28 R31 VCP P5 R25 VN Figure 5. Typical Setup for the ADE7878 Evaluation Board Rev. PrB | Page Preliminary Technical Data Voltage Source P12 IAP JP1A, JP2A = open JP3A, JP4A = closed IAN JP5A, JP6A = open IBP JP1B, JP2B = open JP3B, JP4B = closed ...

Page 7

... Communication Protocol Between Microcontroller and ADE7878). It visualizes the port that matches the protocol and then sets it to 9600 baud, 8 data bits, no parity, no flow control, 1 stop bit. If the evalution board is not connected, the port is Rev. PrB | Page EVAL-ADE7878EB Figure 6. Front panel of ADE7878 Software ...

Page 8

... The only error that may occur during this operation is communication related this happens, the following message is visualized: “The communication between PC and ADE7878 evaluation board or between LPC2368 and ADE78xx did not function correctly. There is no guarantee the reset of ADE7878 has been performed. ” ...

Page 9

... When selected, “Total Reactive Power”, “Fundamental Active Power” and “Fundamental Reactive Power” buttons open panels very similar with the Total Active Power panel. They are presented in Figure 13, Figure 14 and Figure 15. Rev. PrB | Page EVAL-ADE7878EB IRQ pin 0 IRQ pin goes low, 0 IRQ pin goes low ...

Page 10

... EVAL-ADE7878EB Figure 10. Total active energy panel Figure 11. CFx Configuration panel Figure 12. Read Energy Registers panel Preliminary Technical Data Figure 13. Total Reactive Power panel Figure 14. Fundamental Active Power panel Figure 15. Fundamental Reactive Power panel Apparent Power When “Apparent Power” is selected, a new panel is opened (Figure 16) ...

Page 11

... VN, VBP-VN or VCP-VN pins. ” A delay can be introduced (in 10msec increments) between the time the moment the xVRMS[23:0] registers are read. The operation is repeated as long as the button remains pressed. Rev. PrB | Page EVAL-ADE7878EB Figure 17. Current RMS panel IRQ pin to read xVRMS[23:0] (x=A,B,C) 1 IRQ pin goes low and ...

Page 12

... EVAL-ADE7878EB Figure 18. Mean Absolute Value Current panel Figure 19. Voltage RMS panel Power Quality Power Quality panel is divided in two horizontal halfs. The bottom one shows various registers that manage various power quality measurements function of Active Measurement button. The one above shows ADE7878 status and various buttons that manage the measurements. When “ ...

Page 13

... ADE7878 and LPC2368 is I Activating Serial Communication ADE7878 − LPC2368 section for details on how to set I evaluation board. The HSDC transmits data to LPC2368 at 4MHz because this is the maximum speed the slave SPI of LPC2368 can receive data. The panel contains some switches that must be set before ...

Page 14

... EVAL-ADE7878EB To start the acquisition, press “ACQUIRE DATA” button. The data is visualized on two different plots, Waveform1 and Waveform2. If the switch to allow storing of data into files is turned on, the program asks for the name and location of files before storing Waveform1 and Waveform2. Figure 25. Waveform sampling panel ...

Page 15

... ADE7878 status does not show CHECKSUM[31:0] register because it is not available in PSM1 mode ( Figure 31) Figure 31. Mean AbsoluteValue Currents Panel in PSM1 mode Enter PSM2 Mode When “Enter PSM2 mode” is selected, the microcontroller manipulates PM0 and PM1 pins of ADE7878 to switch it into PSM2 low power mode ...

Page 16

... EVAL-ADE7878EB Figure 32. Front Panel after ADE7878 enters PSM2 mode Phase Current Monitoring This panel allows the user to visualize the state of IRQ pins because in PSM2 low power mode, ADE7878 1 compares the phase currents against a threshold determined by LPOILVL[7:0] register (see Figure 33). The button “READ ...

Page 17

... Waits for the interrupt to be triggered. If the wait gets more than the time out specified in the command, then sends back 0xFFFFFFFF the interrupt is triggered, it reads STATUS0[31:0] or STATUS1[31:0] and then writes it back to clear it. The value Rev. PrB | Page EVAL-ADE7878EB IRQx , x=0,1pin low ...

Page 18

... EVAL-ADE7878EB read at this point is the value sent back to the PC so the user can see the source of the interrupts. - Sends back the answer. Table 17. Interrupt Pins Status—Message from PC to Microcontroller Byte Description 0 ‘H’=0x48 1 N=1 - Number of bytes transmitted after this byte 2 Any byte ...

Page 19

... Flash Magic uses the PC COM port to download the microcontroller firmware. In the following, the procedure to use Flash Magic is presented: -Plug a serial cable into connector P15 of ADE7878 evaluation board and into a PC COM port alternative, use ADE8052Z-DWDL1 ADE downloader from Analog Devices together with a USB cable. ...

Page 20

... Reset the ADE7878 evaluation board by pressing and releasing RESET button S2. At this point, the program should be functional and an USB cable may be connected to the board. When the PC recognizes the evaluation board and asks for a driver, please point it to \VirCOM_Driver_XP folder of the project. The file ADE7878_eval_board_vircomport.inf is the driver ...

Page 21

... Preliminary Technical Data EVALUATION BOARD BOM Table 26. Designator A1 A2 C1,C8,C44,C78 C9-C25,C32-C34 C2,C7,C40,C42,C43,C48- C59,C61,C62,C72,C73,C75-C77,C79-C84 C26,C27,C70,C71 C3,C5,C41 C38,C74 C4,C6 CF1-CF3,CLKIN CR1-CR5 CR6 E1A,E1B,E1C,E1N,E2A,E2B,E2C,E2N,E8A,E8B,E 8C,E8N JP2,JP7-JP10,JP1A-JP8A,JP1B-JP8B,JP1C- JP8C,JP1N-JP8N JP32,JP34,JP36,JP38,JP60,JP61 P1-P10,P12 P11,P38 P13 P14 P15 P16 Q1-Q5 R1-R8 R9-R16,RSB R17-R25,R32-R34 R26-R28 R29-R31 R35,R36,R38,R44-R57,R64-R66,R68- R76,R78,R82-R86,R58A,R58B,R59A,R59B R37 R39-R43,R81 ...

Page 22

... EVAL-ADE7878EB Designator P17 P18-P37 R60 R61,R62 R63 TP61,TP62 U2 Value Description WEILAND25.161.0253 CONN-PCB TERM BLK 2P ST SAMTECTSW10608GS5PIN CONN-PCB BERG HDR ST MALE 5P 4.02K RES PREC THICK FILM CHIP R0805 100K RES PREC THICK FILM CHIP R0805 200K RES PREC THICK FILM CHIP R1206 ...

Page 23

... Preliminary Technical Data EVALUATION BOARD SCHEMATIC EVAL-ADE7878EB Rev. PrB | Page ...

Page 24

... EVAL-ADE7878EB Preliminary Technical Data Rev. PrB | Page ...

Page 25

... Preliminary Technical Data EVAL-ADE7878EB Rev. PrB | Page ...

Page 26

... EVAL-ADE7878EB EVALUATION BOARD LAYOUT Preliminary Technical Data Rev. PrB | Page ...

Page 27

... Preliminary Technical Data Rev. PrB | Page EVAL-ADE7878EB ...

Page 28

... EVAL-ADE7878EB Preliminary Technical Data Rev. PrB | Page ...

Page 29

... Preliminary Technical Data Rev. PrB | Page EVAL-ADE7878EB ...

Page 30

... EVAL-ADE7878EB NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB08059-0-2/09(PrB) Preliminary Technical Data Rev. PrB | Page ...

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