Datasheet ADE7763 (Analog Devices)

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Single-Phase Active and Apparent Energy Metering IC Data Sheet ADE7763 FEATURES
perform active and apparent energy measurements, line-voltage
High accuracy; supports IEC 61036/60687, IEC62053-21, and
period measurements, and rms calculation on the voltage and
IEC62053-22
current channels. The selectable on-chip digital integrator
On-chip digital integrator enables direct interface-to-current
provides direct interface to di/dt current sensors such as
sensors with di/dt output
Rogowski coils, eliminating the need for an external analog
A PGA in the current channel allows direct interface to
integrator and resulting in excel ent long-term stability and precise
shunts and current transformers
phase matching between the current and the voltage channels.
Active and apparent energy, sampled waveform, and current
The ADE7763 provides a serial interface to read data and a
and voltage rms
pulse output frequency (CF) that is proportional to the active
Less than 0.1% error in active energy measurement over a
power. Various system calibration features such as channel
dynamic range of 1000 to 1 at 25°C
offset correction, phase calibration, and power calibration
Positive-only energy accumulation mode available
ensure high accuracy. The part also detects short duration, low
On-chip user programmable threshold for line voltage surge
or high voltage variations.
and SAG and PSU supervisory
The positive-only accumulation mode gives the option to
Digital calibration for power, phase, and input offset
accumulate energy only when positive power is detected. An
On-chip temperature sensor (±3°C typical)
internal no-load threshold ensures that the part does not exhibit
SPI®-compatible serial interface
any creep when there is no load. The zero-crossing output (ZX)
Pulse output with programmable frequency
produces a pulse that is synchronized to the zero-crossing point
Interrupt request pin (IRQ) and status register
of the line voltage. This signal is used internally in the line cycle
Reference 2.4 V with external overdrive capability
active and apparent energy accumulation modes, which enables
Single 5 V supply, low power (25 mW typical)
faster calibration.
GENERAL DESCRIPTION
The interrupt status register indicates the nature of the interrupt, The ADE77631 features proprietary ADCs and fixed function DSP and the interrupt enable register controls which event produces for high accuracy over large variations in environmental conditions an output on the IRQ pin, an open-drain, active low logic output. and time. The ADE7763 incorporates two second-order, 16-bit The ADE7763 is available in a 20-lead SSOP package. Σ-∆ ADCs, a digital integrator (on Ch1), reference circuitry, a temperature sensor, and all the signal processing required to
FUNCTIONAL BLOCK DIAGRAM AVDD RESET DVDD DGND INTEGRATOR PGA WGAIN[11:0] ADE7763 MULTIPLIER LPF2 V1P ADC dt V1N HPF1 TEMP APOS[15:0] SENSOR CFNUM[11:0] IRMSOS[11:0] LPF3 VAGAIN[11:0] DFC CF x2 PGA VRMSOS[11:0] CFDEN[11:0] V2P ADC Φ |x| V2N VADIV[7:0] % % WDIV[7:0] PHCAL[5:0] LPF1 LPF3 ZX SAG 2.4V 4kΩ REGISTERS AND REFERENCE SERIAL INTERFACE
-001 A
AGND REF CLKIN CLKOUT DIN DOUT SCLK IN/OUT CS IRQ
04481- Figure 1. 1 U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469.
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Document Outline Features General Description Functional Block Diagram Revision History Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Terminology Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Analog Inputs di/dt Current Sensor and Digital Integrator Zero-Crossing Detection Zero-Crossing Timeout Period Measurement Power Supply Monitor Line Voltage Sag Detection Sag Level Set Peak Detection Peak Level Set Peak Level Record Interrupts Using Interrupts with an MCU Interrupt Timing Temperature Measurement Analog-to-Digital Conversion Antialias Filter ADC Transfer Function Reference Circuit Channel 1 ADC Channel 1 Sampling Channel 1 RMS Calculation Channel 1 RMS Offset Compensation Channel 2 ADC Channel 2 Sampling Channel 2 RMS Calculation Channel 2 RMS Offset Compensation Phase Compensation Active Power Calculation Energy Calculation Integration Time under Steady Load Power Offset Calibration Energy-to-Frequency Conversion Line Cycle Energy Accumulation Mode Positive-Only Accumulation Mode No-Load Threshold Apparent Power Calculation Apparent Power Offset Calibration Apparent Energy Calculation Integration Times under Steady Load Line Apparent Energy Accumulation Energies Scaling Calibrating an Energy Meter Watt Gain Calibrating Watt Gain Using a Reference Meter Example Calibrating Watt Gain Using an Accurate Source Example Watt Offset Calibrating Watt Offset Using a Reference Meter Example Calibrating Watt Offset with an Accurate Source Example Phase Calibration Calibrating Phase Using a Reference Meter Example Calibrating Phase with an Accurate Source Example VRMS and IRMS Calibration Apparent Energy CLKIN Frequency Suspending Functionality Checksum Register Serial Interface ADE7763 Serial Write Operation Serial Read Operation Registers Register Descriptions Communication Register Mode Register (0x09) Outline Dimensions Ordering Guide CH1OS Register (0x0D) Outline Dimensions Ordering Guide