The ADE7880 is a high accuracy, 3-phase electrical energy measurement IC featuring an adaptive real time monitoring (ARTM) harmonic engine.ARTM is capable of monitoring three user selectable harmonics, in addition to the fundamental. ARTM automatically tracks fundamental frequency and provides real-time harmonic measurement updates. Harmonic analysis includes current rms, voltage rms, active, reactive, and apparent powers, power factor, harmonic distortion, and total harmonic distortion plus noise (THD + N) calculations.

The ADE7880 incorporates seven second-order Σ-Δ ADCs, a digital integrator, reference circuitry, and all the signal processing required to perform total (fundamental and harmonic) active, fundamental active, fundamental reactive, and apparent energy measurement and rms calculations.

The ADE7880 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. This metering IC provides system calibration features for each phase: rms and energy offset correction, phase calibration, and gain calibration.

The ADE7880 supports IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20, and IEC 61000-4-7 standards.

The ADE7880 is pin compatible with the popular ADE7878, ADE7868, ADE7858, and ADE7854 3-phase energy metering ICs.

Features• Supports IEC 62053-21,

IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, and ANSI C12.20 standards

• Supports IEC 61000-4-7 Class I and II accuracy specification

• Supplies rms, active, reactive and apparent powers, power factor, THD + N and harmonic distortion of all harmonics within 2.8 KHz pass band

• Supports current transformer and di/dt current sensors

• 10 ppm/°C typical reference drift with external overdrive capability

• 40-lead lead frame chip scale package (LFCSP), Pb-free, pin for pin compatible with ADE7854, ADE7858, ADE7868, and ADE7878

•Wide-supply voltage operation: 2.4 V to 3.7 V

•Operating temperature: −40° to +85°C

Parameter Error Rate Dynamic Range @ TA = 25°C

Harmonic voltage/current rms <1% error 2000:1

Harmonic active/reactive powers <1% error 2000:1

Active/reactive energy <0.1% error 1000:1

Active/reactive energy <0.2% error 5000:1

Voltage/current rms <0.1% error 1000:1

ADE7880—Polyphase Energy Metering IC Includes High Accuracy Harmonic Analysis

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Functional Block Diagram

General DescriptionThe ADE7880 ARTM features complete harmonic analysis including magnitude and phase information. ARTM also computes harmonic distortion relative to the fundamental, as well as THD + N. Harmonic analysis data can be accessed in real time using a burst mode transfer via an SPI interface.

The ADE7880 waveform sample registers allow access to all ADC outputs. This device also incorporates power quality measurements such as short duration low or high voltage detections, short duration high current variations, line voltage period measurement, and angles between phase voltages and currents. Two serial interfaces can be used for communication: SPI or I2C. A dedicated high speed interface HSDC (high speed data capture) port can be used in conjunction with I2C to provide access to the ADC outputs and real-time power information. Two interrupt request pins, IRQ0 and IRQ1, indicate that an enabled interrupt event has occurred. The CF1, CF2, and CF3 logic outputs provide a wide choice of power information: total/fundamental active/reactive power, total apparent power, or sum of current rms values.

ADE7880 Harmonic Calculations

27

28

PM0

PM127CLKIN

28CLKOUT

13ICP

14ICN

19VCP

18VN

9IBP

PGA3

PGA3

PGA1

PGA1

12IBN

22VBP

ADC

ADC

ADC

ADC

ADC

PGA3

PGA1

PGA2

ADC

ADC

16INN

15INP

7IAP

8IAN

23VAP

17

REFIN/OUT26

VDD

25

AGND24

AVDD5

DVDD6

DGND4

RESET

1.2VREF

POR LDO LDO

APHCAL AVGAIN

HPF

AIGAIN

HPF

DIGITALINTEGRATOR

NIGAIN

HPF

DIGITALINTEGRATOR

TOTAL/FUNDAMENTAL ACTIVE ENERGIES,FUNDAMENTAL REACTIVE ENERGY,

APPARENT ENERGY, VOLTAGE/CURRENT RMS,HARMONIC INFORMATION CALCULATION

FOR PHASE B (SEE PHASE A FOR DETAILED PATH)

TOTAL/FUNDAMENTAL ACTIVE ENERGIES,FUNDAMENTAL REACTIVE ENERGY,

APPARENT ENERGY, VOLTAGE/CURRENT RMS,HARMONIC INFORMATION CALCULATION

FOR PHASE C (SEE PHASE A FOR DETAILED PATH)

COMPUTATIONAL BLOCK FOR HARMONICINFORMATION ON NEUTRAL CURRENT

HPFEN OFCONFIG3

HPFEN OF CONFIG3

HPFEN OFCONFIG3

X2 NIRMSLPF

NIRMSOS

COMPUTATIONALBLOCK FOR

FUNDAMENTALACTIVE AND

REACTIVE POWER

X2 AIRMSLPF

AIRMSOS

X2 AVRMSLPF

LPF

AVRMSOS

AVAGAIN

AWGAINAWATTOS

APGAIN AFWATTOS PHASEA, B,AND

C DATA

DFC

CF1DEN

: 33 CF1

DFC

CF2DEN

: 34 CF2/HREADY

DFC

CF3DEN

: 35 CF3/HSCLK

APGAIN AFVAROS

COMPUTATIONALBLOCK FOR HARMONIC

INFORMATION ON PHASE A

CURRENT AND VOLTAGE

36

32

29

SPI/I2C

I2C

IRQ0

IRQ1

SCLK/SCL

38 MOSI/SDA

37 MISO/HSD

39 SS/HSAHSDC

�

�

DIGITAL SIGNALPROCESSOR

HARMONICCOMPUTATION

ENGINE

IA, VAIB, VBIC, VC

IN, ISUM

PHASE SELECTION A OR B OR C

OR N

HARMONIC INDEXES

ZYX

TIME BASE, UPDATE RATE,AND DATA INTERFACE

OPTIONS

3 HARMONICS AND FUNDAMENTAL RESULTS

NEUTRAL AND ISUM RESULTS

WATT IRMS POWER FACTOR

VAR VRMS HARMONIC DISTORTION

VA THD + N

IRMS

ISUMRMS

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