ADE7978 Datasheet, PDF (1/120 Pages) Analog Devices – Isolated Energy Metering Chipset for Polyphase Shunt Meters

Data Sheet
Isolated Energy Metering Chipset
for Polyphase Shunt Meters
ADE7978/ADE7933/ADE7932
FEATURES
Enables shunt current sensors in polyphase energy meters
Immune to magnetic tampering
Highly accurate; supports EN 50470-1, EN 50470-3,
IEC 62053-21, IEC 62053-22, IEC 62053-23, ANSI C12.20,
and IEEE 1459 standards
Compatible with 3-phase, 3- or 4-wire (delta or wye) meters
and other 3-phase services
Computes active, reactive, and apparent energy on each
phase and on the overall system
Less than 0.2% error in active and reactive energy over
a dynamic range of 2000 to 1 at TA = 25°C
Less than 0.1% error in voltage rms over a dynamic range
of 500 to 1 at TA = 25°C
Less than 0.25% error in current rms over a dynamic range
of 500 to 1 at TA = 25°C
Power quality measurements including THD
Single 3.3 V supply
Operating temperature: −40°C to +85°C
Flexible I²C, SPI, and HSDC serial interfaces
Safety and regulatory approvals (pending)
UL recognition
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
IEC 61010-1: 400 V rms
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 846 V peak
APPLICATIONS
Shunt-based polyphase meters
Power quality monitoring
Solar inverters
Process monitoring
Protective devices
Isolated sensor interfaces
Industrial PLCs
TYPICAL APPLICATION CIRCUIT
PHASE PHASE PHASE
NEUTRAL
A
B
C
ISOLATION
BARRIER
V1P
3.3V
VM
IM _{PHASE A}
ADE7932/
IP ^ADE7933
V2P
GND_{ISO_A}
GND_MCU
V1P
3.3V
VM
IM _{PHASE B}
ADE7932/
IP ^ADE7933
V2P
GND_{ISO_B}
GND_MCU
V1P
3.3V
VM
IM _{PHASE C}
ADE7932/
IP ^ADE7933
V2P
ADE7978
ENERGY
METERING
IC
3.3V
I²C/HSDC OR SPI
IRQ0, IRQ1
GND_MCU
3.3V
GND_MCU
LOAD
GND_{ISO_C}
GND_MCU
V1P
VM NEUTRAL
IM
LINE
ADE7932/
ADE7933
IP ^(OPTIONAL)
V2P
3.3V
GND_{ISO_N}
GND_MCU
EARTH
Figure 1. 3-Phase, 4-Wire Meter with Four ADE7933/ADE7932 Devices and One ADE7978
1 _{Protected by U.S. Patents 5,952,849; 6,873,065; 7,075,329; 6,262,600; 7,489,526; and 7,558,080. Other patents are pending.}
Rev. 0
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