Datasheet ADE7953 (Analog Devices)

Single Phase, Multifunction Metering IC with Neutral Current Measurement Data Sheet ADE7953 FEATURES
The device incorporates three Σ-Δ ADCs with a high accuracy energy measurement core. The second input channel simulta-
Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053- 21, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
neously measures neutral current and enables tamper detection
Measures active, reactive, and apparent energy; sampled
and neutral current billing. The additional channel incorporates
waveform; current and voltage rms
a complete signal path that allows a full range of measurements.
Provides a second current input for neutral current
Each input channel supports independent and flexible gain stages,
measurement
making the device suitable for use with a variety of current sensors
Less than 0.1% error in active and reactive energy
such as current transformers (CTs) and low value shunt resistors.
measurements over a dynamic range of 3000:1
Two on-chip integrators facilitate the use of Rogowski coil sensors.
Less than 0.2% error in instantaneous IRMS measurement
The ADE7953 provides access to on-chip meter registers via a
over a dynamic range of 1000:1
variety of communication interfaces including SPI, I2C, and UART.
Provides apparent energy measurement and instantaneous
Two configurable low jitter pulse output pins provide outputs that
power readings
are proportional to active, reactive, or apparent energy, as well as
1.23 kHz bandwidth operation
current and voltage rms. A full range of power quality information
Flexible PGA gain stage (up to ×22)
such as overcurrent, overvoltage, peak, and sag detection are
Includes internal integrators for use with Rogowski coil sensors
accessible via the external IRQ pin. Independent active, reactive,
SPI, I2C, or UART communication
and apparent no-load detections are included to prevent “meter
GENERAL DESCRIPTION
creep.” Dedicated reverse power (REVP), zero-crossing voltage (ZX), and zero-crossing current (ZX_I) pins are also provided. The The ADE7953 is a high accuracy electrical energy measurement ADE7953 energy metering IC operates from a 3.3 V supply voltage IC intended for single phase applications. It measures line voltage and is available in a 28-lead LFCSP package. and current and calculates active, reactive, and apparent energy, as well as instantaneous rms voltage and current.
FUNCTIONAL BLOCK DIAGRAM REF RESET VDD VINTA VINTD AIRMSOS ADE7953 1.2V REF AVAGAIN X2 AIRMS LPF LOW DIGITAL NOISE AIGAIN INTEGRATOR PRE-AMP X2 AVRMS IAP LPF PGA ADC IAN HPF VRMSOS APHCAL VGAIN AWGAIN AWATTOS CF1DEN VP PGA ADC DFC : CF1 VN HPF LPF PHASE A AND B CF2DEN ACTIVE, REACTIVE AND APPARENT ENERGIES AND DATA AVARGAIN AVAROS VOLTAGE/CURRENT RMS IBP CALCULATION FOR PHASE B DFC : CF2 PGA ADC (SEE PHASE A FOR DETAILED COMPUTATIONAL IBN DATA PATH). BLOCK FOR TOTAL REACTIVE POWER REVP REVP CONFIGURATION AND CONTROL ZX ZX AGND ZX_I ZX_I PEAK UART SPI INTERFACE I2C ANGLE DGND POWER FACTOR SAG CLKIN CLKOUT CS MISO/ MOSI/ SCLK
001
IRQ SDA/Tx SCL/Rx
09320- Figure 1.
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Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS SPI Interface Timing SPI Interface Timing Diagram I2C Interface Timing I2C Interface Timing Diagram ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY ADE7953 POWER-UP PROCEDURE REQUIRED REGISTER SETTING THEORY OF OPERATION ANALOG INPUTS Current Channel A Current Channel B Voltage Channel ANALOG-TO-DIGITAL CONVERSION Oversampling Noise Shaping Antialiasing Filter CURRENT CHANNEL ADCS di/dt Current Sensor and Digital Integrator VOLTAGE CHANNEL ADC REFERENCE CIRCUIT ROOT MEAN SQUARE MEASUREMENT CURRENT CHANNEL RMS CALCULATION VOLTAGE CHANNEL RMS CALCULATION ACTIVE POWER CALCULATION SIGN OF ACTIVE POWER CALCULATION ACTIVE ENERGY CALCULATION Active Energy Integration Time Under Steady Load Active Energy Line Cycle Accumulation Mode ACTIVE ENERGY ACCUMULATION MODES Signed Accumulation Mode Positive-Only Accumulation Mode Absolute Accumulation Mode REACTIVE POWER CALCULATION SIGN OF REACTIVE POWER CALCULATION REACTIVE ENERGY CALCULATION Reactive Energy Integration Time Under Steady Load Reactive Energy Line Cycle Accumulation Mode REACTIVE ENERGY ACCUMULATION MODES Signed Accumulation Mode Antitamper Accumulation Mode Absolute Accumulation Mode APPARENT POWER CALCULATION APPARENT ENERGY CALCULATION Apparent Energy Integration Time Under Steady Load Apparent Energy Line Cycle Accumulation Mode AMPERE-HOUR ACCUMULATION ENERGY-TO-FREQUENCY CONVERSION PULSE OUTPUT CHARACTERISTICS ENERGY CALIBRATION GAIN CALIBRATION Current Channel Gain Adjustment PHASE CALIBRATION OFFSET CALIBRATION Power Offsets RMS Offsets PERIOD MEASUREMENT INSTANTANEOUS POWERS AND WAVEFORM SAMPLING POWER FACTOR USING THE LINE CYCLE ACCUMULATION MODE TO DETERMINE THE POWER FACTOR POWER FACTOR WITH NO-LOAD DETECTION ANGLE MEASUREMENT NO-LOAD DETECTION SETTING THE NO-LOAD THRESHOLDS ACTIVE ENERGY NO-LOAD DETECTION Active Energy No-Load Interrupt Active Energy No-Load Status Bits REACTIVE ENERGY NO-LOAD DETECTION Reactive Energy No-Load Interrupt Reactive Energy No-Load Status Bits APPARENT ENERGY NO-LOAD DETECTION Apparent Energy No-Load Interrupt Apparent Energy No-Load Status Bits ZERO-CROSSING DETECTION ZERO-CROSSING OUTPUT PINS Voltage Channel Zero Crossing Current Channel Zero Crossing ZERO-CROSSING INTERRUPTS ZERO-CROSSING TIMEOUT ZERO-CROSSING THRESHOLD VOLTAGE SAG DETECTION SETTING THE SAGCYC REGISTER SETTING THE SAGLVL REGISTER VOLTAGE SAG INTERRUPT PEAK DETECTION INDICATION OF POWER DIRECTION REVERSE POWER SIGN INDICATION OVERCURRENT AND OVERVOLTAGE DETECTION SETTING THE OVLVL AND OILVL REGISTERS OVERVOLTAGE AND OVERCURRENT INTERRUPTS ALTERNATIVE OUTPUT FUNCTIONS ADE7953 INTERRUPTS PRIMARY INTERRUPTS (VOLTAGE CHANNEL AND CURRENT CHANNEL A) CURRENT CHANNEL B INTERRUPTS COMMUNICATING WITH THE ADE7953 COMMUNICATION AUTODETECTION LOCKING THE COMMUNICATION INTERFACE SPI INTERFACE I2C INTERFACE I2C Write Operations I2C Read Operations UART INTERFACE UART Read UART Write COMMUNICATION VERIFICATION AND SECURITY WRITE PROTECTION COMMUNICATION VERIFICATION CHECKSUM REGISTER ADE7953 REGISTERS ADE7953 REGISTER DESCRIPTIONS Interrupt Enable and Interrupt Status Registers Current Channel A and Voltage Channel Registers Current Channel B Registers LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE