ADE7953 datasheet(1/68 Pages) AD

部件名	ADE7953

功能描述	Single Phase, Multifunction Metering IC with Neutral Current Measurement

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制造商	AD [Analog Devices]

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Single Phase, Multifunction Metering IC

with Neutral Current Measurement

Data Sheet

ADE7953

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

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, I2C, 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, I2C, 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 prevent “meter

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

IRQ

PGA

1.2V REF

X2

AIRMS

LPF

AIRMSOS

X2

AVRMS

LPF

VRMSOS

AVAGAIN

AWGAIN

AWATTOS

AVARGAIN

AVAROS

DFC

CF1DEN

:

DFC

CF2DEN

:

VGAIN

APHCAL

HPF

AIGAIN

DIGITAL

INTEGRATOR

HPF

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

I2C

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.

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