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REV. PrC 1/02
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otherwise under any patent or patent rights of Analog Devices.
Active and Apparent Energy Metering IC
with di/dt sensor interface
ADE7753*
FEATURES
High Accuracy, supports IEC 61036 and IEC61268
On-Chip Digital Integrator enables direct interface with
current sensors with di/dt output
The ADE7753 supplies Active, Reactive and Apparent
Energy, Sampled Waveform, Current and Voltage RMS
Less than 0.1% error over a dynamic range of 1000 to 1
Positive only energy accumulation mode available
An On-Chip user Programmable threshold for line
voltage surge and SAG, and PSU supervisory
Digital Power, Phase & Input Offset Calibration
An On-Chip temperature sensor (±3°C typical)
A SPI compatible Serial Interface
A pulse output with programmable frequency
An Interrupt Request pin (IRQ) and Status register
Proprietary ADCs and DSP provide high accuracy data over
large variations in environmental conditions and time
Reference 2.4V±8% (20 ppm/°C typical)
with external overdrive capability
Single 5V Supply, Low power (25mW typical)
FUNCTIONAL BLOCK DIAGRAMFUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL BLOCK DIAGRAMFUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL BLOCK DIAGRAM
*U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others Pending.
precise phase matching between the current and voltage
channels. The integrator can be switched on and off based on
the current sensor selected.
The ADE7753 contains an Active Energy register, an Appar-
ent Energy register capable of holding at least TBD seconds
of accumulated power at full load and rms calculation for
both inputs. Data is read from the ADE7753 via the serial
interface. The ADE7753 also provides a pulse output (CF)
with output frequency is proportional to the active power.
In addition to rms calculation and active and apparent power
information, the ADE7753 also accumulates the signed
reactive energy. The ADE7753 also provides various system
calibration features, i.e., channel offset correction, phase
calibration and power calibration. The part also incorporates
a detection circuit for short duration low or high voltage
variations.
The ADE7753 has a positive only accumulation mode which
gives the option to accumulate energy only when positive
power is detected. An internal no-load threshold ensures that
the part does not exhibit any creep when there is no load.
A zero crossing output (ZX) produces an output which is
synchronized to the zero crossing point of the line voltage.
This information is used in the ADE7753 to measure the
line's period. The signal is also used internally to the chip in
the line cycle Active and Apparent energy accumulation
mode. This enables a faster and more precise energy accumu-
lation and is useful during calibration. This signal is also
useful for synchronization of relay switching with a voltage
zero crossing.
The interrupt request output is an open drain, active low logic
output. The Interrupt Status Register indicates the nature of
the interrupt, and the Interrupt Enable Register controls
which event produces an output on the IRQ pin.
The ADE7753 is available in 20-lead SSOP package.
:
DVDD
HPF
LPF2
DGND
CLKOUT
V1P
V1N
+
-
+
-
V2P
V2N
2.4V
REFERENCE
ADC
AVDD
PGA
CLKIN
REFIN/OUT
CF
RESET
AGND
4kΩ
Φ
PHCAL[5:0]
MULTIPLIER
Σ
APOS[15:0]
DINDOUT SCLK CS
SAG
ZX
IRQ
ADE7753 REGISTERS &
SERIAL INTERFACE
ADE7753
TEMP
SENSOR
LPF1
INTEGRATOR
冮
dt
VRMSOS[11:0]
IRMSOS[11:0]
Σ
Σ
WGAIN[11:0]
WDIV[7:0]
CFNUM[11:0]
CFDEN[11:0]
DFC
VAGAIN[11:0]
VADIV[7:0]
:
PGA
ADC
PRELIMINARY TECHNICAL DATA
Preliminary Technical DataGENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION