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PDF ( 数据手册 , 数据表 ) ADE7858

零件编号 ADE7858
描述 Polyphase Multifunction Energy Metering IC
制造商 Analog Devices
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ADE7858 数据手册, 描述, 功能
Data Sheet
Polyphase Multifunction Energy Metering IC
with Harmonic and Fundamental Information
ADE7854/ADE7858/ADE7868/ADE7878
FEATURES
Highly accurate; supports EN 50470-1, EN 50470-3,
IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
Compatible with 3-phase, 3- or 4-wire (delta or wye), and
other 3-phase services
Supplies total (fundamental and harmonic) active, reactive
(ADE7878, ADE7868, and ADE7858 only), and apparent
energy, and fundamental active/reactive energy (ADE7878
only) on each phase and on the overall system
Less than 0.1% error in active and reactive energy over a
dynamic range of 1000 to 1 at TA = 25°C
Less than 0.2% error in active and reactive energy over a
dynamic range of 3000 to 1 at TA = 25°C
Supports current transformer and di/dt current sensors
Dedicated ADC channel for neutral current input (ADE7868 and
ADE7878 only)
Less than 0.1% error in voltage and current rms over a
dynamic range of 1000 to 1 at TA = 25°C
Supplies sampled waveform data on all three phases and on
neutral current
Selectable no load threshold levels for total and
fundamental active and reactive powers, as well as for
apparent powers
Low power battery mode monitors phase currents for
antitampering detection (ADE7868 and ADE7878 only)
Battery supply input for missing neutral operation
Phase angle measurements in both current and voltage
channels with a typical 0.3° error
Wide-supply voltage operation: 2.4 V to 3.7 V
Reference: 1.2 V (drift +5 ppm/°C typical) with external
overdrive capability
Single 3.3 V supply
40-lead lead frame chip scale package (LFCSP), Pb-free
Operating temperature: −40°C to +85°C
Flexible I2C, SPI, and HSDC serial interfaces
APPLICATIONS
Energy metering systems
GENERAL DESCRIPTION
The ADE7854/ADE7858/ADE7868/ADE7878 are high accuracy,
3-phase electrical energy measurement ICs with serial interfaces
and three flexible pulse outputs. The ADE78xx devices incorporate
second-order sigma-delta (Σ-∆) analog-to-digital converters
(ADCs), a digital integrator, reference circuitry, and all of the
signal processing required to perform total (fundamental and
harmonic) active, reactive (ADE7878, ADE7868, and
ADE7858), and apparent energy measurement and rms calcu-
lations, as well as fundamental-only active and reactive energy
measurement (ADE7878) and rms calculations. A fixed function
digital signal processor (DSP) executes this signal processing.
The DSP program is stored in the internal ROM memory.
The ADE7854/ADE7858/ADE7868/ADE7878 are suitable for
measuring active, reactive, and apparent energy in various 3-phase
configurations, such as wye or delta services, with both three
and four wires. The ADE78xx devices provide system calibration
features for each phase, that is, rms offset correction, phase
calibration, and gain calibration. The CF1, CF2, and CF3 logic
outputs provide a wide choice of power information: total active,
reactive, and apparent powers, or the sum of the current rms
values, and fundamental active and reactive powers.
The ADE7854/ADE7858/ADE7868/ADE7878 contain wave-
form sample registers that allow access to all ADC outputs. The
devices also incorporate power quality measurements, such as
short duration low or high voltage detections, short duration
high current variations, line voltage period measurement, and
angles between phase voltages and currents. Two serial interfaces,
SPI and I2C, can be used to communicate with the ADE78xx. A
dedicated high speed interface, the high speed data capture
(HSDC) port, can be used in conjunction with I2C to provide
access to the ADC outputs and real-time power information.
The ADE7854/ADE7858/ADE7868/ADE7878 also have two
interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled
interrupt event has occurred. For the ADE7868/ADE7878, three
specially designed low power modes ensure the continuity of
energy accumulation when the ADE7868/ADE7878 is in a tam-
pering situation. See Table 1 for a quick reference chart listing
each part and its functions. The ADE78xx are available in the
40-lead LFCSP, Pb-free package.
Table 1. Part Comparison
Part No.
IRMS,
VRMS,
and
WATT VAR VA
ADE7878 Yes
Yes Yes
ADE7868 Yes
Yes Yes
ADE7858 Yes
Yes Yes
ADE7854 Yes
No Yes
di/dt
Yes
Yes
Yes
Yes
Fundamental
WATT and
VAR
Yes
No
No
No
Tamper
Detect and
Low Power
Modes
Yes
Yes
No
No
Rev. H
Document Feedback
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 ©2010–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com







ADE7858 pdf, 数据表
ADE7854/ADE7858/ADE7868/ADE7878
Data Sheet
Figure 4. ADE7878 Functional Block Diagram
Rev. H | Page 8 of 100







ADE7858 equivalent, schematic
ADE7854/ADE7858/ADE7868/ADE7878
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
NC 1
PM0 2
PM1 3
RESET 4
DVDD 5
DGND 6
IAP 7
IAN 8
IBP 9
NC 10
ADE78xx
TOP VIEW
(Not to Scale)
30 NC
29 IRQ0
28 CLKOUT
27 CLKIN
26 VDD
25 AGND
24 AVDD
23 VAP
22 VBP
21 NC
NOTES
1. NC = NO CONNECT.
2. CREATE A SIMILAR PAD ON THE PCB UNDER THE
EXPOSED PAD. SOLDER THE EXPOSED PAD TO
THE PAD ON THE PCB TO CONFER MECHANICAL
STRENGTH TO THE PACKAGE. CONNECT THE
PADS TO AGND AND DGND.
Figure 9. Pin Configuration
Table 8. Pin Function Descriptions
Pin No.
Mnemonic
1, 10, 11, 20, NC
21, 30, 31, 40
2 PM0
3 PM1
4 RESET
5 DVDD
6 DGND
7, 8 IAP, IAN
9, 12 IBP, IBN
13, 14
ICP, ICN
15, 16
INP, INN
17 REFIN/OUT
Description
No Connect. These pins are not connected internally. It is recommended to ground these pins.
Power Mode Pin 0. This pin, combined with PM1, defines the power mode of the
ADE7854/ADE7858/ADE7868/ADE7878, as described in Table 9.
Power Mode Pin 1. This pin defines the power mode of the ADE7854/ADE7858/ADE7868/ADE7878
when combined with PM0, as described in Table 9.
Reset Input, Active Low. In PSM0 mode, this pin should stay low for at least 10 µs to trigger a
hardware reset.
2.5 V output of the digital low dropout regulator (LDO). Decouple this pin with a 4.7 µF capacitor in
parallel with a ceramic 220 nF capacitor. Do not connect external active circuitry to this pin.
Ground Reference. This pin provides the ground reference for the digital circuitry.
Analog Inputs for Current Channel A. This channel is used with the current transducers and is
referenced in this document as Current Channel A. These inputs are fully differential voltage inputs
with a maximum differential level of ±0.5 V. This channel also has an internal PGA equal to the ones
on Channel B and Channel C.
Analog Inputs for Current Channel B. This channel is used with the current transducers and is
referenced in this document as Current Channel B. These inputs are fully differential voltage inputs
with a maximum differential level of ±0.5 V. This channel also has an internal PGA equal to the ones
on Channel C and Channel A.
Analog Inputs for Current Channel C. This channel is used with the current transducers and is
referenced in this document as Current Channel C. These inputs are fully differential voltage inputs
with a maximum differential level of ±0.5 V. This channel also has an internal PGA equal to the ones
on Channel A and Channel B.
Analog Inputs for Neutral Current Channel N. This channel is used with the current transducers and
is referenced in this document as Current Channel N. These inputs are fully differential voltage
inputs with a maximum differential level of ±0.5 V. This channel also has an internal PGA, different
from the ones found on the A, B, and C channels. The neutral current channel is available in the
ADE7878 and ADE7868. In the ADE7858 and ADE7854, connect these pins to AGND.
This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal
value of 1.2 V. An external reference source with 1.2 V ± 8% can also be connected at this pin. In
either case, decouple this pin to AGND with a 4.7 µF capacitor in parallel with a ceramic 100 nF
capacitor. After reset, the on-chip reference is enabled.
Rev. H | Page 16 of 100










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