ADE78xx Polyphase Multifunction Energy Metering ICs PDF

ADE7878, ADE7868, ADE7858, ADE7854
Polyphase Multifunction Energy Metering ICs
Overview
Features
•Supplies total (fundamental
and harmonic) active/reactive/
apparent energy and fundamental
active/reactive energy on each
phase and on the overall system
•Highly accurate; supports
EN 50470-1, EN 50470-3,
IEC 62053-21, IEC 62053-22,
and IEC 62053-23
•Compatible with 3-phase, 3- or
4-wire (delta or wye), and other
3-phase services
•Less than 0.1% error in active and
reactive energy over a dynamic
range of 1000 to 1 at 25°C
•Supports current transformer
and di/dt current sensors
•Dedicated ADC channel for the
neutral current input
•Supplies sampled waveform
data on all 3 phases and neutral
current
•Single 3.3 V supply
•40-lead, lead-free, lead frame
chip scale package (LFCSP)
•Operating temperature
–40° to +85°C
•Flexible I C , SPI, HSDC serial
interfaces
2 ®
The ADE7878, ADE7868, ADE7858, and ADE7854 are high accuracy,
3-phase electrical energy measurement ICs with serial interfaces and three
flexible pulse outputs. They incorporate six or seven second-order Σ-∆
ADCs, a digital integrator, reference circuitry, and all the signal processing
required to perform total (fundamental and harmonic) active, reactive,
and apparent energy measurement, fundamental only active and reactive
energy measurement, and rms calculations.
These metering ICs are 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. They provide system calibration features for
each phase: rms offset correction, phase calibration, and gain calibration.
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.
•Less than 0.2% error in active and
reactive energy over a dynamic
range of 3000 to 1 at 25°C
www.analog.com/energymeter
Functional Block Diagram
RESET
REF IN/OUT
4
17
VDD AGND AVDD
26
DVDD
DGND
5
6
24
25
AIRMSOS
POR
CLKIN 27
CLKOUT 28
LDO
LDO
X2
1.2V
REF
HPFDIS [23:0]
IAP 7
IBP 9
APHCAL
PGA3
IBN 12
ADC
TOTAL/FUNDAMENTAL ACTIVE/REACTIVE
ENERGIES, APPARENT ENERGY AND VOLTAGE/
CURRENT RMS CALCULATION FOR PHASE B
(SEE PHASE A FOR DETAILED DATA PATH)
ADC
ADC
ADC
VN 18
AVAROS
HPFDIS [23:0]
INN 16
ADC
33
CF1
DFC
AFVAROS AFVARGAIN
NIRMS
LPF
:
DFC
34
CF2
35
CF3/HSCLK
29
IRQ0
32
IRQ1
36
SCLK/SCL
38
MOSI/SDA
37
MISO/HSD
39
SS/HSA
CFxDEN
NIRMSOS
X2
HPF
PHASE
A, B,
AND
C DATA
AFWATTOS AFWGAIN
COMPUTATIONAL
BLOCK FOR
FUNDAMENTAL
ACTIVE AND
REACTIVE POWER
NIGAIN
PGA2
AVARGAIN
COMPUTATIONAL
BLOCK FOR TOTAL
REACTIVE POWER
DIGITAL
INTEGRATOR
:
DFC
CFxDEN
HPF
TOTAL/FUNDAMENTAL ACTIVE/REACTIVE
ENERGIES, APPARENT ENERGY AND VOLTAGE/
CURRENT RMS CALCULATION FOR PHASE C
(SEE PHASE A FOR DETAILED DATA PATH)
PGA3
VCP 19
AWGAIN
LPF
PGA1
ICN 14
INP 15
AWATTOS
HPFDIS [23:0]

PGA3
CFxDEN
AVRMSOS
HPF
AVGAIN
ADC
PGA1
VBP 22
ICP 13

ADC
IAN 8
ADE7878
AVRMS
LPF
AIGAIN
PGA1
VAP 23
X2
DIGITAL
INTEGRATOR
AVAGAIN
AIRMS
LPF
SPI/I2C
DIGITAL SIGNAL
PROCESSOR
General Description
The ADE7878, ADE7868, ADE7858, and ADE7854 have waveform sample registers that allow access to all
ADC outputs. These devices also incorporate 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 table below indicates feature sets available for each of the products. All products provide the same level
of performance and accuracy. The ADE7854 features active energy measurements only. The ADE7858 adds
reactive energy measurements. The ADE7868 and ADE7878 include a seventh ADC channel for neutral current
measurements. These parts also include advanced antitamper features and power-down modes. The ADE7878
adds fundamental active and reactive power measurements.
Part Number
Watt
VAR
Tamper
Detect
Low Power
Modes
Fundamental
Powers
ADE7878
•
•
•
•
•
ADE7868
•
•
•
•
ADE7858
•
•
ADE7854
•
I 2C
HSDC
:
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Printed in the U.S.A.
PH08556-1-3/10(A)
www.analog.com/energymeter