Datasheet ADE7758 (Analog Devices) - 2

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ADE7758 Data Sheet TABLE OF CONTENTS
Features .. 1  Temperature Measurement ... 27  General Description ... 1  Root Mean Square Measurement... 28  Functional Block Diagram .. 1  Active Power Calculation .. 30  General Description ... 4  Reactive Power Calculation .. 35  Specifications... 5  Apparent Power Calculation... 39  Timing Characteristics .. 6  Energy Registers Scaling ... 41  Timing Diagrams.. 7  Waveform Sampling Mode ... 41  Absolute Maximum Ratings.. 8  Calibration... 42  ESD Caution.. 8  Checksum Register... 55  Pin Configuration and Function Descriptions... 9  Interrupts... 55  Terminology .. 11  Using the Interrupts with an MCU.. 56  Typical Performance Characteristics ... 12  Interrupt Timing .. 56  Test Circuits... 17  Serial Interface .. 56  Theory of Operation .. 18  Serial Write Operation... 57  Antialiasing Filter ... 18  Serial Read Operation.. 59  Analog Inputs.. 18  Accessing the On-Chip Registers... 59  Current Channel ADC... 19  Registers... 60  di/dt Current Sensor and Digital Integrator... 20  Communications Register... 60  Peak Current Detection ... 21  Operational Mode Register (0x13) .. 64  Overcurrent Detection Interrupt ... 21  Measurement Mode Register (0x14) ... 64  Voltage Channel ADC ... 22  Waveform Mode Register (0x15) ... 65  Zero-Crossing Detection... 23  Computational Mode Register (0x16)... 66  Phase Compensation.. 23  Line Cycle Accumulation Mode Register (0x17) ... 67  Period Measurement .. 25  Interrupt Mask Register (0x18) .. 68  Line Voltage SAG Detection ... 25  Interrupt Status Register (0x19)/Reset Interrupt Status Register (0x1A)... 69  SAG Level Set.. 26  Outline Dimensions ... 70  Peak Voltage Detection.. 26  Ordering Guide .. 70  Phase Sequence Detection... 26  Power-Supply Monitor... 27  Reference Circuit .. 27 
Revision History 10/11—Rev. D to Rev. E
Changes to Equation 25... 34 Changes to Figure 69.. 34 Changes to Figure 1.. 1 Changes to Table 17 ... 62 Changes to Figure 41.. 19 Change to Table 18 ... 64 Changes to Figure 60.. 27 Changes to Table 24 ... 69 Added Figure 61; Renumbered Sequentially .. 27 Changes to Ordering Guide .. 70 Changes to Phase Sequence Detection Section .. 27 Changes to Power-Supply Monitor Section .. 27
10/08—Rev. C to Rev. D
Changes to Figure 62.. 28 Changes to Figure 1...1 Changes to Figure 67.. 32 Changes to Phase Sequence Detection Section and Figure 60. 27 Changes to Figure 68.. 32 Rev. E | Page 2 of 72 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS GENERAL DESCRIPTION SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS THEORY OF OPERATION ANTIALIASING FILTER ANALOG INPUTS CURRENT CHANNEL ADC Current Channel Sampling di/dt CURRENT SENSOR AND DIGITAL INTEGRATOR PEAK CURRENT DETECTION Peak Current Detection Using the PEAK Register OVERCURRENT DETECTION INTERRUPT VOLTAGE CHANNEL ADC Voltage Channel Sampling ZERO-CROSSING DETECTION Zero-Crossing Timeout PHASE COMPENSATION PERIOD MEASUREMENT LINE VOLTAGE SAG DETECTION SAG LEVEL SET PEAK VOLTAGE DETECTION Peak Voltage Detection Using the VPEAK Register Overvoltage Detection Interrupt PHASE SEQUENCE DETECTION POWER-SUPPLY MONITOR REFERENCE CIRCUIT TEMPERATURE MEASUREMENT ROOT MEAN SQUARE MEASUREMENT Current RMS Calculation Current RMS Offset Compensation Voltage Channel RMS Calculation Voltage RMS Offset Compensation Voltage RMS Gain Adjust ACTIVE POWER CALCULATION Active Power Gain Calibration Active Power Offset Calibration Sign of Active Power Calculation No-Load Threshold Active Energy Calculation Integration Time Under Steady Load Energy Accumulation Mode Active Power Frequency Output Line Cycle Active Energy Accumulation Mode REACTIVE POWER CALCULATION Reactive Power Gain Calibration Reactive Power Offset Calibration Sign of Reactive Power Calculation Reactive Energy Calculation Integration Time Under Steady Load Energy Accumulation Mode Reactive Power Frequency Output Line Cycle Reactive Energy Accumulation Mode APPARENT POWER CALCULATION Apparent Power Gain Calibration Apparent Power Offset Calibration Apparent Energy Calculation Integration Time Under Steady Load Energy Accumulation Mode Apparent Power Frequency Output Line Cycle Apparent Energy Accumulation Mode ENERGY REGISTERS SCALING WAVEFORM SAMPLING MODE CALIBRATION Calibration Using Pulse Output Gain Calibration Using Pulse Output Example: Watt Gain Calibration of Phase A Using Pulse Output Phase Calibration Using Pulse Output Example: Phase Calibration of Phase A Using Pulse Output Power Offset Calibration Using Pulse Output Example: Offset Calibration of Phase A Using Pulse Output Calibration Using Line Accumulation Gain Calibration Using Line Accumulation Example: Watt Gain Calibration Using Line Accumulation Phase Calibration Using Line Accumulation Example: Phase Calibration Using Line Accumulation Power Offset Calibration Using Line Accumulation Example: Power Offset Calibration Using Line Accumulation Calibration of IRMS and VRMS Offset Example: Calibration of RMS Offsets CHECKSUM REGISTER INTERRUPTS USING THE INTERRUPTS WITH AN MCU INTERRUPT TIMING SERIAL INTERFACE SERIAL WRITE OPERATION SERIAL READ OPERATION ACCESSING THE ON-CHIP REGISTERS REGISTERS COMMUNICATIONS REGISTER OPERATIONAL MODE REGISTER (0x13) MEASUREMENT MODE REGISTER (0x14) WAVEFORM MODE REGISTER (0x15) COMPUTATIONAL MODE REGISTER (0x16) LINE CYCLE ACCUMULATION MODE REGISTER (0x17) INTERRUPT MASK REGISTER (0x18) INTERRUPT STATUS REGISTER (0x19)/RESET INTERRUPT STATUS REGISTER (0x1A) OUTLINE DIMENSIONS ORDERING GUIDE