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ADE7953 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADE7953
Beschreibung Multifunction Metering IC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADE7953 Datasheet, Funktion
Data Sheet
Single Phase, Multifunction Metering IC
with Neutral Current Measurement
ADE7953
FEATURES
The device incorporates three Σ-Δ ADCs with a high accuracy
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
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.
Provides apparent energy measurement and instantaneous
The ADE7953 provides access to on-chip meter registers via a
power readings
variety of communication interfaces including SPI, I2C, and UART.
1.23 kHz bandwidth operation
Two configurable low jitter pulse output pins provide outputs that
Flexible PGA gain stage (up to ×22)
Includes internal integrators for use with Rogowski coil sensors
SPI, I2C, or UART communication
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
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.
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
REF
RESET
VDD
VINTA
VINTD
1.2V REF
LOW
NOISE
PRE-AMP
IAP
PGA
IAN
ADC
AIGAIN
APHCAL VGAIN
HPF
DIGITAL
INTEGRATOR
VP
PGA
VN
ADC
IBP
PGA
IBN
ADC
HPF
ACTIVE, REACTIVE AND
APPARENT ENERGIES AND
VOLTAGE/CURRENT RMS
CALCULATION FOR PHASE B
(SEE PHASE A FOR DETAILED
DATA PATH).
AIRMSOS
X2 LPF
AIRMS
AVAGAIN
ADE7953
X2 LPF
AVRMS
VRMSOS
AWGAIN AWATTOS
LPF
COMPUTATIONAL
BLOCK FOR TOTAL
REACTIVE POWER
AVARGAIN AVAROS
PHASE
A AND B
DATA
CF1DEN
DFC :
CF2DEN
DFC :
CF1
CF2
AGND
DGND
CONFIGURATION
AND CONTROL
UART
SPI INTERFACE
REVP
ZX
ZX_I
REVP
ZX
ZX_I
PEAK
I2C ANGLE
POWER FACTOR
SAG
CLKIN CLKOUT
IRQ CS
Figure 1.
MISO/
SDA/Tx
MOSI/
SCL/Rx
SCLK
Rev. A
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 that may result from its use. Specifications subject to change without notice. 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
©2011 Analog Devices, Inc. All rights reserved.






ADE7953 Datasheet, Funktion
ADE7953
Data Sheet
TIMING CHARACTERISTICS
SPI Interface Timing
VDD = 3.3 V ± 10%, AGND = DGND = 0 V, on-chip reference, CLKIN = 3.58 MHz, TMIN to TMAX = −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter
tCS
tSCLK
tSL
tSH
tDAV
tDSU
tDHD
tDF
tDR
tSR
tSF
tDIS
tSFS
tSFS_LK
Description
CS to SCLK edge
SCLK period
SCLK low pulse width
SCLK high pulse width
Data output valid after SCLK edge
Data input setup time before SCLK edge
Data input hold time after SCLK edge
Data output fall time
Data output rise time
SCLK rise time
SCLK fall time
MISO disabled after CS rising edge
CS high after SCLK edge
CS high after SCLK edge (when writing to
COMM_LOCK bit)
Min1
50
200
80
80
80
70
5
5
0
1200
Max1
20
20
20
20
40
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1 Min and max values are typical minimum and maximum values.
SPI Interface Timing Diagram
CS
tCS
tSCLK
SCLK
tDAV
tSL
tSH
tSFS_LK
tSFS
tSF tSR
tDIS
MISO
MSB OUT
INTERMEDIATE BITS
LSB OUT
MOSI
tDF
INTERMEDIATE BITS
tDR
tDSU
MSB IN
tDHD
Figure 2. SPI Interface Timing
LSB IN
Rev. A | Page 6 of 68

6 Page









ADE7953 pdf, datenblatt
ADE7953
1.0
0.8
–40°C
0.6 +25°C
+85°C
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.01
0.1 1 10
CURRENT CHANNE L (% FULL SCALE)
100
Figure 11. Current Channel A Reactive Energy Error as a Percentage of Reading
(Gain = 1, Power Factor = 0) over Temperature with Internal Reference,
Integrator Off
1.0
0.8
PF = –0.866
0.6 PF = 0
PF = +0.866
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.01
0.1 1 10
CURRENT CHANNE L (% FULL SCALE)
100
Figure 12. Current Channel A Reactive Energy Error as a Percentage of Reading
(Gain = 1, Temperature = 25°C) over Power Factor with Internal Reference,
Integrator Off
1.0
0.8 –40°C
+25°C
0.6 +85°C
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.01
0.1 1 10
CURRENT CHANNE L (% FULL SCALE)
100
Figure 13. Current Channel A Reactive Energy Error as a Percentage of Reading
(Gain = 22, Power Factor = 0) over Temperature with Internal Reference,
Integrator Off
Data Sheet
1.0
0.8
PF = –0.866
0.6 PF = 0
PF = +0.866
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.01
0.1 1 10
CURRENT CHANNE L (% FULL SCALE)
100
Figure 14. Current Channel A Reactive Energy Error as a Percentage of Reading
(Gain = 22, Temperature = 25°C) over Power Factor with Internal Reference,
Integrator Off
1.0
0.8 PF = –0.866
PF = 0
0.6 PF = +0.866
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
– 1.0
45
50 55 60
FREQUENCY (Hz)
65
Figure 15. Current Channel A Reactive Energy Error as a Percentage of Reading
(Gain = 22, Temperature = 25°C) over Frequency and Power Factor
with Internal Reference, Integrator Off
1.0
0.8
GAIN = 1
0.6 GAIN = 22
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.1
1 10
CURRENT CHANNE L (% FULL SCALE)
100
Figure 16. Current Channel A IRMS Error as a Percentage of Reading
(Temperature = 25°C, Power Factor = 1) over Gain with Internal Reference,
Integrator Off
Rev. A | Page 12 of 68

12 Page





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