Datasheet ADE7854, ADE7858, ADE7868, ADE7878 (Analog Devices)

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Polyphase Multifunction Energy Metering IC with Harmonic and Fundamental Information Data Sheet ADE7854/ ADE7858/ ADE7868/ ADE7878 FEATURES
harmonic) active, reactive (ADE7878, ADE7868, and
Highly accurate; supports EN 50470-1, EN 50470-3,
ADE7858), and apparent energy measurement and rms calcu-
IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
lations, as wel as fundamental-only active and reactive energy
Compatible with 3-phase, 3- or 4-wire (delta or wye), and
measurement (ADE7878) and rms calculations. A fixed function
other 3-phase services
digital signal processor (DSP) executes this signal processing.
Supplies total (fundamental and harmonic) active, reactive
The DSP program is stored in the internal ROM memory.
(ADE7878, ADE7868, and ADE7858 o nly), and apparent
The ADE7854/ADE7858/ADE7868/ADE7878 are suitable for
energy, and fundamental active/reactive energy (ADE7878
measuring active, reactive, and apparent energy in various 3-phase
only) on each phase and on the overall system
configurations, such as wye or delta services, with both three
Less than 0.1% error in active and reactive energy over a
and four wires. The ADE78xx devices provide system calibration
dynamic range of 1000 to 1 at TA = 25°C
features for each phase, that is, rms offset correction, phase
Less than 0.2% error in active and reactive energy over a
calibration, and gain calibration. The CF1, CF2, and CF3 logic
dynamic range of 3000 to 1 at TA = 25°C
outputs provide a wide choice of power information: total active,
Supports current transformer and di/dt current sensors
reactive, and apparent powers, or the sum of the current rms
Dedicated ADC channel for neutral current input (ADE7868 a nd
values, and fundamental active and reactive powers.
ADE7878 o nly)
The ADE7854/ADE7858/ADE7868/ADE7878 contain wave-
Less than 0.1% error in voltage and current rms over a
form sample registers that allow access to all ADC outputs. The
dynamic range of 1000 to 1 at TA = 25°C
devices also incorporate power quality measurements, such as
Supplies sampled waveform data on all three phases and on
short duration low or high voltage detections, short duration
neutral current
high current variations, line voltage period measurement, and
Selectable no load threshold levels for total and
angles between phase voltages and currents. Two serial interfaces,
fundamental active and reactive powers, as well as for
SPI and I2C, can be used to communicate with the ADE78xx. A
apparent powers
dedicated high speed interface, the high speed data capture
Low power battery mode monitors phase currents for
(HSDC) port, can be used in conjunction with I2C to provide
antitampering detection (ADE7868 a nd ADE7878 o nly) Battery supply input for missing neutral operation
access to the ADC outputs and real-time power information.
Phase angle measurements in both current and voltage
The ADE7854/ADE7858/ADE7868/ADE7878 also have two
channels with a typical 0.3° error
interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled
Wide-supply voltage operation: 2.4 V to 3.7 V
interrupt event has occurred. For the ADE7868/ADE7878, three
Reference: 1.2 V (drift +5 ppm/°C typical) with external
specially designed low power modes ensure the continuity of
overdrive capability
energy accumulation when the ADE7868/ADE7878 is in a tam-
Single 3.3 V supply
pering situation. See Table 1 for a quick reference chart listing
40-lead lead frame chip scale package (LFCSP), Pb-free
each part and its functions. The ADE78xx are available in the
Operating temperature: −40°C to +85°C
40-lead LFCSP, Pb-free package.
Flexible I2C, SPI, and HSDC serial interfaces Table 1. Part Comparison APPLICATIONS IRMS, Tamper VRMS, Fundamental Detect and Energy metering systems and WATT and Low Power Part No. WATT VAR VA di/dt VAR Modes GENERAL DESCRIPTION
ADE7878 Yes Yes Yes Yes Yes Yes The ADE7854/ADE7858/ADE7868/ADE7878 are high accuracy, ADE7868 Yes Yes Yes Yes No Yes 3-phase electrical energy measurement ICs with serial interfaces ADE7858 Yes Yes Yes Yes No No and three flexible pulse outputs. The ADE78xx devices incorporate ADE7854 Yes No Yes Yes No No 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
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Document Outline Features Applications General Description Table of Contents Revision History Functional Block Diagrams Specifications Timing Characteristics Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Test Circuit Terminology Power Management PSM0—Normal Power Mode (All Parts) PSM1—Reduced Power Mode (ADE7868, ADE7878 Only) PSM2—Low Power Mode (ADE7868, ADE7878 Only) PSM3—Sleep Mode (All Parts) Power-Up Procedure Hardcore Reset Software Reset Functionality Theory of Operation Analog Inputs Analog-to-Digital Conversion Antialiasing Filter ADC Transfer Function Current Channel ADC Current Waveform Gain Registers Current Channel HPF Current Channel Sampling di/dt Current Sensor and Digital Integrator Voltage Channel ADC Voltage Waveform Gain Registers Voltage Channel HPF Voltage Channel Sampling Changing Phase Voltage Datapath POWER QUALITY MEASUREMENTS Zero-Crossing Detection Zero-Crossing Timeout Phase Sequence Detection Time Interval Between Phases Period Measurement Phase Voltage Sag Detection SAG Level Set Peak Detection Overvoltage and Overcurrent Detection Overvoltage and Overcurrent Level Set Neutral Current Mismatch—ADE7868, ADE7878 Phase Compensation Reference Circuit Digital Signal Processor Root Mean Square Measurement Current RMS Calculation Current RMS Offset Compensation Current Mean Absolute Value Calculation—ADE7868 and ADE7878 Only Current MAV Gain and Offset Compensation Voltage Channel RMS Calculation Voltage RMS Offset Compensation Active Power Calculation Total Active Power Calculation Fundamental Active Power Calculation—ADE7878 Only Active Power Gain Calibration Active Power Offset Calibration Sign of Active Power Calculation Active Energy Calculation Integration Time Under Steady Load Energy Accumulation Modes Line Cycle Active Energy Accumulation Mode Reactive Power Calculation—ADE7858, ADE7868, ADE7878 Only Reactive Power Gain Calibration Reactive Power Offset Calibration Sign of Reactive Power Calculation Reactive Energy Calculation Integration Time Under A Steady Load Energy Accumulation Modes Line Cycle Reactive Energy Accumulation Mode Apparent Power Calculation Apparent Power Gain Calibration Apparent Power Offset Calibration Apparent Power Calculation Using VNOM Apparent Energy Calculation Integration Time Under Steady Load Energy Accumulation Mode Line Cycle Apparent Energy Accumulation Mode Waveform Sampling Mode Energy-to-Frequency Conversion Synchronizing Energy Registers with CFx Outputs CF Outputs for Various Accumulation Modes Sign of Sum-of-Phase Powers in the CFx Datapath No Load Condition No Load Detection Based On Total Active, Reactive Powers No Load Detection Based on Fundamental Active and Reactive Powers—ADE7878 Only No Load Detection Based on Apparent Power Checksum Register Interrupts Using the Interrupts with an MCU Serial Interfaces Serial Interface Choice I2C-Compatible Interface I2C Write Operation I2C Read Operation SPI-Compatible Interface SPI Read Operation SPI Write Operation HSDC Interface Quick Setup as Energy Meter Layout Guidelines Crystal Circuit ADE7878 Evaluation Board Die Version Silicon Anomaly ADE7854/ADE7858/ADE7868/ADE7878 Functionality Issues Functionality Issues SECTION 1. ADE7854/ADE7858/ADE7868/ADE7878 Functionality Issues Registers List Outline Dimensions Ordering Guide