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ADE7758 Datasheet

Poly Phase Multifunction Energy Metering IC

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Data Sheet
Poly Phase Multifunction Energy Metering
IC with Per Phase Information
ADE7758
FEATURES
Highly accurate; supports IEC 60687, IEC 61036, IEC 61268,
IEC 62053-21, IEC 62053-22, and IEC 62053-23
Compatible with 3-phase/3-wire, 3-phase/4-wire, and other
3-phase services
Less than 0.1% active energy error over a dynamic range of
1000 to 1 at 25°C
Supplies active/reactive/apparent energy, voltage rms,
current rms, and sampled waveform data
Two pulse outputs, one for active power and the other
selectable between reactive and apparent power with
programmable frequency
Digital power, phase, and rms offset calibration
On-chip, user-programmable thresholds for line voltage SAG
and overvoltage detections
An on-chip, digital integrator enables direct interface-to-
current sensors with di/dt output
A PGA in the current channel allows direct interface to
current transformers
An SPI®-compatible serial interface with IRQ
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time
Reference 2.4 V (drift 30 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (70 mW typical)
GENERAL DESCRIPTION
The ADE7758 is a high accuracy, 3-phase electrical energy
measurement IC with a serial interface and two pulse outputs.
The ADE7758 incorporates second-order Σ-Δ ADCs, a digital
integrator, reference circuitry, a temperature sensor, and all the
signal processing required to perform active, reactive, and
apparent energy measurement and rms calculations.
The ADE7758 is suitable to measure active, reactive, and
apparent energy in various 3-phase configurations, such as
WYE or DELTA services, with both three and four wires. The
ADE7758 provides system calibration features for each phase,
that is, rms offset correction, phase calibration, and power
calibration. The APCF logic output gives active power
information, and the VARCF logic output provides instantaneous
reactive or apparent power information.
AVDD
4
POWER
SUPPLY
MONITOR
REFIN/OUT
12
AGND
11
FUNCTIONAL BLOCK DIAGRAM
|X|
AVRMSGAIN[11:0]
AVRMSOS[11:0]
AVAG[11:0]
ADE7758
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP 15
ICP 9
ICN 10
VCP 14
VN 13
2.4V
REF
PGA1
+
4k
ADC
PGA2
+
ADC
PGA1
+
PGA1
+
PGA2
+
ADC
ADC
PGA2
+
ADC
ADC
X2
90° PHASE
SHIFTING FILTER
π
dt 2
HPF INTEGRATOR
AIRMSOS[11:0]
LPF
LPF2
AVAROS[11:0]
AVARG[11:0]
REACTIVE OR
APPARENT POWER
VARCFNUM[ 11:0]
DFC ÷
17 VARCF
VARCFDEN[ 11:0]
Φ
APHCAL[6:0]
LPF2
AWATTOS[11:0] AWG[11:0]
PHASE B
AND
PHASE C
DATA
ACTIVE/REACTIVE/AP PARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCUL ATION
FOR PHASE B
(SEE PHASE A FOR DETAILED SIGNAL PATH)
ACTIVE/REACTIVE/AP PARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCUL ATION
FOR PHASE C
(SEE PHASE A FOR DETAILED SIGNAL PATH)
VADIV[7:0]
VARDIV[7:0]
WDIV[7:0]
%
%
%
ADE7758 REGISTERS AND
SERIAL INTERFACE
ACTIVE POWER
APCFNUM[ 11:0]
DFC ÷
APCFDEN[ 11:0]
Figure 1.
22 24 23
DIN DOUT SCLK
21
CS
18
IRQ
1 APCF
3 DVDD
2 DGND
19 CLKIN
20 CLKOUT
Rev. E
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2011 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADE7758 Datasheet

Poly Phase Multifunction Energy Metering IC

No Preview Available !

ADE7758
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 4 
Specifications..................................................................................... 5 
Timing Characteristics ................................................................ 6 
Timing Diagrams.............................................................................. 7 
Absolute Maximum Ratings............................................................ 8 
ESD Caution.................................................................................. 8 
Pin Configuration and Function Descriptions............................. 9 
Terminology .................................................................................... 11 
Typical Performance Characteristics ........................................... 12 
Test Circuits..................................................................................... 17 
Theory of Operation ...................................................................... 18 
Antialiasing Filter ....................................................................... 18 
Analog Inputs.............................................................................. 18 
Current Channel ADC............................................................... 19 
di/dt Current Sensor and Digital Integrator............................... 20 
Peak Current Detection ............................................................. 21 
Overcurrent Detection Interrupt ............................................. 21 
Voltage Channel ADC ............................................................... 22 
Zero-Crossing Detection........................................................... 23 
Phase Compensation.................................................................. 23 
Period Measurement .................................................................. 25 
Line Voltage SAG Detection ..................................................... 25 
SAG Level Set.............................................................................. 26 
Peak Voltage Detection.............................................................. 26 
Phase Sequence Detection......................................................... 26 
Power-Supply Monitor............................................................... 27 
Reference Circuit ........................................................................ 27 
Temperature Measurement ....................................................... 27 
Root Mean Square Measurement............................................. 28 
Active Power Calculation .......................................................... 30 
Reactive Power Calculation ...................................................... 35 
Apparent Power Calculation..................................................... 39 
Energy Registers Scaling ........................................................... 41 
Waveform Sampling Mode ....................................................... 41 
Calibration................................................................................... 42 
Checksum Register..................................................................... 55 
Interrupts..................................................................................... 55 
Using the Interrupts with an MCU.......................................... 56 
Interrupt Timing ........................................................................ 56 
Serial Interface ............................................................................ 56 
Serial Write Operation............................................................... 57 
Serial Read Operation................................................................ 59 
Accessing the On-Chip Registers............................................. 59 
Registers........................................................................................... 60 
Communications Register......................................................... 60 
Operational Mode Register (0x13) .......................................... 64 
Measurement Mode Register (0x14) ....................................... 64 
Waveform Mode Register (0x15) ............................................. 65 
Computational Mode Register (0x16)..................................... 66 
Line Cycle Accumulation Mode Register (0x17) ................... 67 
Interrupt Mask Register (0x18) ................................................ 68 
Interrupt Status Register (0x19)/Reset Interrupt Status
Register (0x1A)........................................................................... 69 
Outline Dimensions ....................................................................... 70 
Ordering Guide .......................................................................... 70 
Revision History
10/11—Rev. D to Rev. E
Changes to Figure 1.......................................................................... 1
Changes to Figure 41...................................................................... 19
Changes to Figure 60...................................................................... 27
Added Figure 61; Renumbered Sequentially .............................. 27
Changes to Phase Sequence Detection Section .......................... 27
Changes to Power-Supply Monitor Section ................................ 27
Changes to Figure 62...................................................................... 28
Changes to Figure 67...................................................................... 32
Changes to Figure 68...................................................................... 32
Changes to Equation 25................................................................. 34
Changes to Figure 69...................................................................... 34
Changes to Table 17 ....................................................................... 62
Change to Table 18 ......................................................................... 64
Changes to Table 24 ....................................................................... 69
Changes to Ordering Guide .......................................................... 70
10/08—Rev. C to Rev. D
Changes to Figure 1...........................................................................1
Changes to Phase Sequence Detection Section and Figure 60. 27
Rev. E | Page 2 of 72


Part Number ADE7758
Description Poly Phase Multifunction Energy Metering IC
Maker Analog Devices
Total Page 30 Pages
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