ADE7953 Datasheet, PDF (1/68 Pages) Analog Devices – Single Phase, Multifunction Metering IC with Neutral Current Measurement

Data Sheet
Single Phase, Multifunction Metering IC
with Neutral Current Measurement
ADE7953
FEATURES
Measures active, reactive, and apparent energy; sampled
waveform; current and voltage rms
Provides a second current input for neutral current
measurement
Less than 0.1% error in active and reactive energy
measurements over a dynamic range of 3000:1
Less than 0.2% error in instantaneous IRMS measurement
over a dynamic range of 1000:1
The device incorporates three Σ-Δ ADCs with a high accuracy
energy measurement core. The second input channel simulta-
neously measures neutral current and enables tamper detection
and neutral current billing. The additional channel incorporates
a complete signal path that allows a full range of measurements.
Each input channel supports independent and flexible gain stages,
making the device suitable for use with a variety of current sensors
such as current transformers (CTs) and low value shunt resistors.
Two on-chip integrators facilitate the use of Rogowski coil sensors.
Provides apparent energy measurement and instantaneous
power readings
1.23 kHz bandwidth operation
Flexible PGA gain stage (up to ×22)
Includes internal integrators for use with Rogowski coil sensors
SPI, I²C, or UART communication
The ADE7953 provides access to on-chip meter registers via a
variety of communication interfaces including SPI, I²C, and UART.
Two configurable low jitter pulse output pins provide outputs that
are proportional to active, reactive, or apparent energy, as well as
current and voltage rms. A full range of power quality information
such as overcurrent, overvoltage, peak, and sag detection are
GENERAL DESCRIPTION
The ADE7953 is a high accuracy electrical energy measurement
IC intended for single phase applications. It measures line voltage
and current and calculates active, reactive, and apparent energy,
as well as instantaneous rms voltage and current.
accessible via the external IRQ pin. Independent active, reactive,
and apparent no-load detections are included to prevent “meter
creep.” Dedicated reverse power (REVP), zero-crossing voltage
(ZX), and zero-crossing current (ZX_I) pins are also provided. The
ADE7953 energy metering IC operates from a 3.3 V supply voltage
and is available in a 28-lead LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
REF
RESET
VDD
VINTA
VINTD
1.2V REF
LOW
NOISE
PRE-AMP
IAP
PGA
IAN
ADC
AIGAIN
APHCAL VGAIN
HPF
DIGITAL
INTEGRATOR
VP
PGA
VN
ADC
IBP
PGA
IBN
ADC
HPF
ACTIVE, REACTIVE AND
APPARENT ENERGIES AND
VOLTAGE/CURRENT RMS
CALCULATION FOR PHASE B
(SEE PHASE A FOR DETAILED
DATA PATH).
AIRMSOS
X²
LPF
AIRMS
AVAGAIN
ADE7953
X²
LPF
AVRMS
VRMSOS
AWGAIN AWATTOS
LPF
COMPUTATIONAL
BLOCK FOR TOTAL
REACTIVE POWER
AVARGAIN AVAROS
PHASE
A AND B
DATA
CF1DEN
DFC
:
CF1
CF2DEN
DFC
:
CF2
AGND
DGND
CONFIGURATION
AND CONTROL
UART
SPI INTERFACE
REVP
ZX
ZX_I
REVP
ZX
ZX_I
PEAK
I²C
ANGLE
POWER FACTOR
SAG
CLKIN CLKOUT
IRQ
CS
Figure 1.
MISO/
SDA/Tx
MOSI/
SCL/Rx
SCLK
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2011 Analog Devices, Inc. All rights reserved.