Datasheet ADE7880 (Analog Devices)

Polyphase Multifunction Energy Metering IC with Harmonic Monitoring Data Sheet ADE7880 FEATURES GENERAL DESCRIPTION Highly accurate; supports IEC 62053-21, IEC 62053-22,
The ADE78801 is a high accuracy, 3-phase electrical energy
IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20, and
measurement IC with serial interfaces and three flexible pulse
IEEE1459 standards
outputs. The ADE7880 device incorporates second-order sigma-
Supports IEC 61000-4-7 Class I and Class II accuracy
delta (Σ-Δ) analog-to-digital converters (ADCs), a digital
specification
integrator, reference circuitry, and all of the signal processing
Compatible with 3-phase, 3-wire or 4-wire (delta or wye),
required to perform the total (fundamental and harmonic) active,
and other 3-phase services
and apparent energy measurements, rms calculations, as well as
Supplies rms, active, reactive, and apparent powers, power
fundamental-only active and reactive energy measurements. In
factor, THD, and harmonic distortion of all harmonics
addition, the ADE7880 computes the rms of harmonics on the
within 2.8 kHz pass band on all phases
phase and neutral currents and on the phase voltages, together
Supplies rms and harmonic distortions of all harmonics
with the active, reactive and apparent powers, and the power
within 2.8 kHz pass band on neutral current
factor and harmonic distortion on each harmonic for all phases.
Less than 1% error in harmonic current and voltage rms,
Total harmonic distortion (THD) is computed for all currents
harmonic active and reactive powers over a dynamic
and voltages. A fixed function digital signal processor (DSP)
range of 2000 to 1 at TA = 25°C
executes this signal processing. The DSP program is stored in
Supplies total (fundamental and harmonic) active and
the internal ROM memory.
apparent energy and fundamental active/reactive energy
The ADE7880 is suitable for measuring active, reactive, and
on each phase and on the overall system
apparent energy in various 3-phase configurations, such as wye
Less than 0.1% error in active and fundamental reactive
or delta services with, both, three and four wires. The ADE7880
energy over a dynamic range of 1000 to 1 at TA = 25°C
provides system calibration features for each phase, that is, rms
Less than 0.2% error in active and fundamental reactive
offset correction, phase calibration, and gain calibration. The
energy over a dynamic range of 5000 to 1 at TA = 25°C
CF1, CF2, and CF3 logic outputs provide a wide choice of
Less than 0.1% error in voltage and current rms over a
power information: total active powers, apparent powers, or the
dynamic range of 1000 to 1 at TA = 25°C
sum of the current rms values, and fundamental active and
Battery supply input for missing neutral operation
reactive powers.
Wide supply voltage operation: 2.4 V to 3.7 V Reference: 1.2 V (drift 20 ppm/°C typical) with external
The ADE7880 contains waveform sample registers that allow
overdrive capability
access to all ADC outputs. The devices also incorporate power
40-lead lead frame chip scale package (LFCSP), Pb-free, pin-
quality measurements, such as short duration low or high
for-pin compatible with ADE7854, ADE7858, ADE7868 an d
voltage detections, short duration high current variations, line
ADE7878
voltage period measurement, and angles between phase voltages and currents. Two serial interfaces, SPI and I2C, can be used to
APPLICATIONS
communicate with the ADE7880. A dedicated high speed
Energy metering systems
interface, the high speed data capture (HSDC) port, can be used
Power quality monitoring
in conjunction with I2C to provide access to the ADC outputs
Solar inverters
and real-time power information. The ADE7880 also has two
Process monitoring
interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled
Protective devices
interrupt event has occurred. Three specially designed low power modes ensure the continuity of energy accumulation when the ADE7880 is in a tampering situation. The ADE7880 is available in the 40-lead LFCSP, Pb-free package, pin-for-pin compatible with ADE7854, ADE7858, ADE7868, and ADE7878 devices. 1 Protected by U.S. Patent 8,010,304 B2. Other patents pending.
Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2011–2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY POWER MANAGEMENT PSM0—NORMAL POWER MODE (ALL PARTS) PSM1—REDUCED POWER MODE PSM2—LOW POWER MODE PSM3—SLEEP MODE (ALL PARTS) POWER-UP PROCEDURE HARDWARE RESET SOFTWARE RESET FUNCTIONALITY THEORY OF OPERATION ANALOG INPUTS ANALOG-TO-DIGITAL CONVERSION Antialiasing Filter ADC Transfer Function CURRENT CHANNEL ADC Current Waveform Gain Registers Current Channel HPF Current Channel Sampling di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR VOLTAGE CHANNEL ADC Voltage Waveform Gain Registers Voltage Channel HPF Voltage Channel Sampling CHANGING PHASE VOLTAGE DATA PATH POWER QUALITY MEASUREMENTS Zero-Crossing Detection Zero-Crossing Timeout Phase Sequence Detection Time Interval Between Phases Period Measurement Phase Voltage Sag Detection Sag Level Set Peak Detection Overvoltage and Overcurrent Detection Overvoltage and Overcurrent Level Set Neutral Current Mismatch PHASE COMPENSATION REFERENCE CIRCUIT DIGITAL SIGNAL PROCESSOR ROOT MEAN SQUARE MEASUREMENT Current RMS Calculation Current RMS Offset Compensation Current Mean Absolute Value Calculation Current MAV Gain and Offset Compensation Voltage Channel RMS Calculation Voltage RMS Offset Compensation Voltage RMS in 3-Phase, 3-Wire Delta Configurations ACTIVE POWER CALCULATION Total Active Power Calculation Fundamental Active Power Calculation Managing Change in Fundamental Line Frequency Active Power Gain Calibration Active Power Offset Calibration Sign of Active Power Calculation Active Energy Calculation Integration Time Under Steady Load Active Energy Accumulation Modes Line Cycle Active Energy Accumulation Mode FUNDAMENTAL REACTIVE POWER CALCULATION Fundamental Reactive Power Gain Calibration Fundamental Reactive Power Offset Calibration Sign of Fundamental Reactive Power Calculation Fundamental Reactive Energy Calculation Integration Time Under Steady Load Fundamental Reactive Energy Accumulation Modes Line Cycle Reactive Energy Accumulation Mode APPARENT POWER CALCULATION Apparent Power Gain Calibration Apparent Power Offset Calibration Apparent Power Calculation Using VNOM Apparent Energy Calculation Integration Time Under Steady Load Apparent Energy Accumulation Modes Line Cycle Apparent Energy Accumulation Mode POWER FACTOR CALCULATION HARMONICS CALCULATIONS Harmonics Calcuations Theory Configuring the Harmonic Calculations Harmonic Calculations When a Phase is Monitored Harmonic Calculations When the Neutral is Monitored Configuring Harmonic Calculations Update Rate Recommended Approach to Managing Harmonic Calculations WAVEFORM SAMPLING MODE ENERGY-TO-FREQUENCY CONVERSION Synchronizing Energy Registers with CFx Outputs Energy Registers and CF Outputs for Various Accumulation Modes Sign of Sum of Phase Powers in the CFx Data Path NO LOAD CONDITION No Load Detection Based On Total Active Power and Apparent Power No Load Detection Based on Fundamental Active and Reactive Powers No Load Detection Based on Apparent Power CHECKSUM REGISTER INTERRUPTS Using the Interrupts with an MCU SERIAL INTERFACES Serial Interface Choice Communication Verification I2C-Compatible Interface I2C Write Operation I2C Read Operation I2C Read Operation of Harmonic Calculations Registers SPI-Compatible Interface SPI Read Operation SPI Read Operation of Harmonic Calculations Registers SPI Write Operation HSDC Interface ADE7880 QUICK SETUP AS ENERGY METER LAYOUT GUIDELINES CRYSTAL CIRCUIT ADE7880 EVALUATION BOARD DIE VERSION SILICON ANOMALY ADE7880 FUNCTIONALITY ISSUES FUNCTIONALITY ISSUES SECTION 1. ADE7880 FUNCTIONALITY ISSUES REGISTERS LIST OUTLINE DIMENSIONS ORDERING GUIDE