ADE7754_15 Datasheet, PDF (1/44 Pages) Analog Devices – Polyphase Multifunction Energy Metering IC with Serial Port

Polyphase Multifunction
Energy Metering IC with Serial Port
ADE7754
FEATURES
High Accuracy, Supports IEC 687/61036
Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire
and any Type of 3-Phase Services
Less than 0.1% Error in Active Power Measurement over a
Dynamic Range of 1000 to 1
Supplies Active Energy, Apparent Energy, Voltage RMS,
Current RMS, and Sampled Waveform Data
Digital Power, Phase, and Input Offset Calibration
On-Chip Temperature Sensor (؎4؇C Typical after Calibration)
On-Chip User Programmable Thresholds for Line Voltage
SAG and Overdrive Detections
SPI Compatible Serial Interface with Interrupt
Request Line (IRQ)
Pulse Output with Programmable Frequency
Proprietary ADCs and DSP Provide High Accuracy over
Large Variations in Environmental Conditions and Time
Single 5 V Supply
GENERAL DESCRIPTION
The ADE7754 is a high accuracy polyphase electrical energy
measurement IC with a serial interface and a pulse output. The
ADE7754 incorporates second order Σ-∆ ADCs, reference
circuitry, temperature sensor, and all the signal processing
required to perform active, apparent energy measurements, and
rms calculation.
The ADE7754 provides different solutions for measuring active
and apparent energy from the six analog inputs, thus enabling
the use of the ADE7754 in various power meter services such as
3-phase/4-wire, 3-phase/3-wire, and 4-wire delta.
In addition to rms calculation, active and apparent power infor-
mation, the ADE7754 provides system calibration features for
each phase (i.e., channel offset correction, phase calibration,
and gain calibration). The CF logic output provides instanta-
neous active power information.
The ADE7754 has a waveform sample register that enables
access to ADC outputs. The part also incorporates a detection
circuit for short duration low or high voltage variations. The
voltage threshold levels and the duration (number of half line
cycles) of the variation are user programmable.
A zero-crossing detection is synchronized with the zero-crossing
point of the line voltage of each of the three phases. The infor-
mation collected is used to measure each line’s period. It is also
used internally to the chip in the line active energy and line
apparent energy accumulation modes. This permits faster and
more accurate calibration of the power calculations. This signal
is also useful for synchronization of relay switching.
Data is read from the ADE7754 via the SPI serial interface. The
interrupt request output (IRQ) is an open-drain, active low
logic output. The IRQ output goes active low when one or more
interrupt events have occurred in the ADE7754. A status regis-
ter indicates the nature of the interrupt.
The ADE7754 is available in a 24-lead SOIC package.
I_AP
I_AN
V_AP
I_BP
I_BN
V_BP
I_CP
I_CN
V_CP
V_N
REV. 0
PGA1
PGA2
ADC
ADC
PGA1
PGA2
ADC
ADC
PGA1
PGA2
ADC
ADC
4k⍀
2.4V REF
FUNCTIONAL BLOCK DIAGRAM
RESET
AV_DD
AVGAIN
X²
AAPGAIN _HPF
X²
⌽ APHCAL
BVGAIN
X²
BAPGAIN _HPF
X²
⌽ BPHCAL
CVGAIN
X²
CAPGAIN _HPF
X²
⌽ CPHCAL
AVRMSOS
AIRMSOS
AVAG
LPF2
AAPOS
BVRMSOS
BIRMSOS
|X|
AWG _ABS
BVAG
LPF2
BAPOS
CVRMSOS
CIRMSOS
BWG
|X|
ABS
CVAG
LPF2
CAPOS
CWG
TEMP
SENSOR
|X|
ABS
ADC
POWER SUPPLY
MONITOR
ADE7754
CFNUM
DFC
،
CFDEN
% WDIV % VADIV
ADE7754 REGISTERS AND
SERIAL INTERFACE
AGND
REF_IN/OUT
DIN DOUT SCLK CS IRQ
CF
DV_DD
DGND
CLKIN
CLKOUT
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