ADE7754 Datasheet, PDF (1/44 Pages) Analog Devices – ADE7754

PRELIMINARY TECHNICAL DATA
a
Poly-phase Multi-Function
Energy Metering IC with Serial Port
Preliminary Technical Data
ADE7754*
FEATURES
The ADE7754 provides different solutions to measure Active
High Accuracy, supports IEC 687/61036
and Apparent Energy from the six analog inputs thus en-
Compatible with 3-phase/3-wire, 3-phase/4-wire
abling the use of the ADE7754 in various Power meter
and any type of 3-phase services
services as 3-phase 4-wire, 3-phase 3-wire but also 4-wire
Less than 0.1% error in Active Power Measurement delta.
over a dynamic range of 1000 to 1
In addition to RMS calculation, Real and Apparent power
The ADE7754 supplies Active Energy, Apparent Energy,
informations, the ADE7754 provides system calibration
Voltage rms, Current rms and Sampled Waveform Data.
features for each phase, i.e., channel offset correction, phase
Digital Power, Phase & Input Offset Calibration.
calibration and gain calibration. The CF logic output gives
An On-Chip temperature sensor (±3°C typ. after calibration)
instantaneous real power information.
On-Chip user Programmable thresholds for line voltage
The ADE7754 has a waveform sample register which enables
SAG and overdrive detections.
access to ADC outputs. The part also incorporates a detec-
A SPI compatible Serial Interface with Interrupt Request line tion circuit for short duration low or high voltage variations.
(IRQ).
The voltage threshold levels and the duration (no. of half line
A pulse output with programmable frequency
cycles) of the variation are user programmable.
Proprietary ADCs and DSP provide high accuracy over large A zero crossing detection is synchronized which the zero
variations in environmental conditions and time.
crossing point of the line voltage of each of the three phases.
Reference 2.4V±8% (Drift 30 ppm/°C typical)
This information is used to measure each line’s Period. It is
with external overdrive capability
also used internally to the chip in the Line Active Energy and
Single 5V Supply, Low power (80mW typical)
Line Apparent Energy accumulation modes. This permits
GENERAL DESCRIPTION
faster and more accurate calibration of the power calcula-
The ADE7754 is a high accuracy Poly-phase electrical tions. This signal is also useful for synchronization of relay
energy measurement IC with a serial interface and a pulse switching.
output. The ADE7754 incorporates second order sigma- Data is read from the ADE7754 via the SPI serial interface.
delta ADCs, reference circuitry, temperature sensor, and all The interrupt request output (IRQ) is an open drain, active
the signal processing required to perform Active, Apparent low logic output. The IRQ output will go active low when one
Energy measurements and rms calculation.
or more interrupt events have occurred in the ADE7754. A
status register will indicate the nature of the interrupt.
The ADE7754 is available in a 24-lead SOIC package.
FUNCTIONAL BLOCK DIAGRAM
AVGAIN
X2
PGA1
AAPGAIN
X2
IAP 5
IAN 6
VAP 16
ADC
PGA2
ADC
HPF
Φ APHCAL
BVGAIN
X2
PGA1
IBP 7
IBN 8
VBP 15
PGA2
ADC
ADC
BAPGAIN
X2
HPF
Φ BPHCAL
PGA1
ICP
ICN 10
VCP 14
VN 13
PGA2
ADC
ADC
CVGAIN
CAPGAIN
X2
X2
HPF
Φ CPHCAL
* Patents pending.
REV. PrG 01/03
2.5V
REF
11
AGND
4kΩ
12
REFIN/OUT
AVRMSOS
Σ
AIRMSOS
Σ
AVAG
RESET
17
AVDD
4
Power
Supply
Monitor
ADE7754
LPF2
Σ
AAPOS
BVRMSOS
Σ
BIRMSOS
Σ
Σ
LPF2
BAPOS
CVRMSOS
Σ
CIRMSOS
Σ
LPF2
Σ
CAPOS
AWG
|X|
ABS
BVAG
Σ ^|X|
BWG ^ABS
CVAG
|X|
CWG ABS
TEMP
SENSOR
ADC
Σ
CFNUM
DFC
CFDEN
WDIV
VADIV
ADE7754 REGISTERS &
SERIAL INTERFACE
22
24
23
21
18
DIN DOUT SCLKCS IRQ
1 _CF
3 _DVDD
2 DGND
19 CLKIN
20 CLKOUT
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© Analog Devices, Inc., 2003