EVAL-ADE7754EB Datasheet

IC型号：
EVAL-ADE7754EB
PDF描述：
Poly-phase Multi-Function Energy Metering IC with Serial Por...
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PRELIMINARY TECHNICAL DATA

Preliminary Technical Data

Poly-phase Multi-Function

Energy Metering IC with Serial Port

ADE7754*

The ADE7754 provides different solutions to measure Active

and Apparent Energy from the six analog inputs thus en-

abling the use of the ADE7754 in various Power meter

services as 3-phase 4-wire, 3-phase 3-wire but also 4-wire

delta.

In addition to RMS calculation, Real and Apparent power

informations, the ADE7754 provides system calibration

features for each phase, i.e., channel offset correction, phase

calibration and gain calibration. The CF logic output gives

instantaneous real power information.

The ADE7754 has a waveform sample register which enables

access to ADC outputs. The part also incorporates a detec-

tion circuit for short duration low or high voltage variations.

The voltage threshold levels and the duration (no. of half line

cycles) of the variation are user programmable.

A zero crossing detection is synchronized which the zero

crossing point of the line voltage of each of the three phases.

This information is used to measure each line鈥檚 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 calcula-

tions. 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 will go active low when one

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.

RESET

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

The ADE7754 supplies

Active Energy, Apparent Energy,

Voltage rms, Current rms

and

Sampled Waveform Data.

Digital Power, Phase & Input Offset Calibration.

An On-Chip temperature sensor (卤3掳C typ. after calibration)

On-Chip user Programmable thresholds for line voltage

SAG and overdrive detections.

A SPI compatible Serial Interface with Interrupt Request line

(IRQ).

A pulse output with programmable frequency

Proprietary ADCs and DSP provide high accuracy over large

variations in environmental conditions and time.

Reference 2.4V卤8% (Drift 30 ppm/掳C typical)

with external overdrive capability

Single 5V Supply, Low power (80mW typical)

GENERAL DESCRIPTION

The ADE7754 is a high accuracy Poly-phase electrical

energy measurement IC with a serial interface and a pulse

output. The ADE7754 incorporates second order sigma-

delta ADCs, reference circuitry, temperature sensor, and all

the signal processing required to perform Active, Apparent

Energy measurements and rms calculation.

FUNCTIONAL BLOCK DIAGRAM

AVDD

AVGAIN

AVRMSOS

AIRMSOS

危

AVAG

Power

Supply

Monitor

ADE7754

PGA1

AAPGAIN

危

LPF2

IAP

IAN

VAP

PGA2

ADC

HPF

危

AAPOS

BVRMSOS

|X|

AWG

ADC

桅

APHCAL

BVGAIN

ABS

BIRMSOS

危

BVAG

PGA1

BAPGAIN

危

LPF2

CVRMSOS

危

BAPOS

CFNUM

IBP

IBN

VBP

PGA2

ADC

HPF

|X|

BWG

危

DFC

CFDEN

ADC

桅

BPHCAL

CVGAIN

CIRMSOS

ABS

危

CVAG

PGA1

CAPGAIN

危

LPF2

DVDD

DGND

CLKIN

CLKOUT

ICP

ICN

VCP

PGA2

ADC

HPF

危

CAPOS

|X|

CWG

TEMP

SENSOR

WDIV

VADIV

ADC

2.5V

REF

桅

CPHCAL

ABS

4k鈩?/div>

ADC

ADE7754 REGISTERS &

SERIAL INTERFACE

* Patents pending.

REV. PrG 01/03

AGND

REF

IN/OUT

DIN DOUT SCLK

CS IRQ

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

漏 Analog Devices, Inc., 2003

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