Datasheet

Single Phase, Multifunction Metering IC
with Neutral Current Measurement
Data Sheet
ADE7953
Rev. B Document Feedback
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FEATURES
Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-
21, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
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
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, I
2
C, or UART communication
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.
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.
The ADE7953 provides access to on-chip meter registers via a
variety of communication interfaces including SPI, I
2
C, 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
accessible via the external
IRQ
pin. Independent active, reactive,
and apparent no-load detections are included to preventmeter
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
IAP
IAN
VP
VN
IBP
IBN
ADE7953
AGND
DGND
CS SCLK
CLKIN
REF RESET VDD VINTA VINTD
CLKOUT
REVP
ZX
CF2
CF1
ZX_I
09320-001
IRQ
PGA
PGA
PGA
1.2V REF
X
2
AIRMS
LPF
AIRMSOS
X
2
AVRMS
LPF
LPF
VRMSOS
AVAGAIN
AWGAIN
AWATTOS
AVARGAIN
AVAROS
DFC
CF1DEN
:
DFC
CF2DEN
:
VGAINAPHCAL
HPF
AIGAIN
DIGITAL
INTEGRATOR
HPF
ADC
ADC
ADC
ACTIVE, REACTIVE AND
APPARENT ENERGIES AND
VOLTAGE/CURRENT RMS
CALCULATION FOR PHASE B
(SEE PHASE A FOR DETAILED
DATA PATH).
COMPUTATIONAL
BLOCK FOR TOTAL
REACTIVE POWER
CONFIGURATION
AND CONTROL
UART SPI INTERFACE
I
2
C
REVP
ZX
ZX_I
PEAK
ANGLE
POWER FACTOR
SAG
LOW
NOISE
PRE-AMP
PHASE
A AND B
DATA
MISO/
SDA/Tx
MOSI/
SCL/Rx
Figure 1.

Summary of content (72 pages)