Poly Phase Multifunction Energy Metering IC with Per Phase Information Data Sheet ADE7758 FEATURES Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time Highly accurate supports IEC 60687, IEC 61036, IEC 61268, Reference 2.4 V (drift 30 ppm/C typical) with external IEC 62053-21, IEC 62053-22, and IEC 62053-23 overdrive capability Compatible with 3-phase/3-wire, 3-phase/4-wire, and other Single 5 V supply, low power (70 mW typical) 3-phase services Less than 0.1% active energy error over a dynamic range of GENERAL DESCRIPTION 1000 to 1 at 25C The ADE7758 is a high accuracy, 3-phase electrical energy Supplies active/reactive/apparent energy, voltage rms, measurement IC with a serial interface and two pulse outputs. current rms, and sampled waveform data The ADE7758 incorporates second-order - ADCs, a digital Two pulse outputs, one for active power and the other integrator, reference circuitry, a temperature sensor, and all the selectable between reactive and apparent power with signal processing required to perform active, reactive, and programmable frequency apparent energy measurement and rms calculations. Digital power, phase, and rms offset calibration The ADE7758 is suitable to measure active, reactive, and On-chip, user-programmable thresholds for line voltage SAG apparent energy in various 3-phase configurations, such as and overvoltage detections WYE or DELTA services, with both three and four wires. The An on-chip, digital integrator enables direct interface-to- current sensors with di/dt output ADE7758 provides system calibration features for each phase, A PGA in the current channel allows direct interface to that is, rms offset correction, phase calibration, and power current transformers calibration. The APCF logic output gives active power An SPI-compatible serial interface with IRQ information, and the VARCF logic output provides instantaneous reactive or apparent power information. FUNCTIONAL BLOCK DIAGRAM REF AVDD AGND IN/OUT 4 12 11 X ADE7758 POWER SUPPLY AVAG 11:0 MONITOR AVRMSGAIN 11:0 AVRMSOS 11:0 2 X REACTIVE OR 4k 2.4V APPARENT POWER REF LPF VARCFNUM 11:0 AIRMSOS 11:0 90 PHASE PGA1 SHIFTING FILTER IAP 5 + DFC 17 VARCF ADC dt 2 IAN 6 HPF INTEGRATOR LPF2 VARCFDEN 11:0 AVAROS 11:0 AVARG 11:0 PGA2 VAP 16 + ADC PHASE B AND LPF2 PHASE C APHCAL 6:0 AWATTOS 11:0 AWG 11:0 PGA1 DATA IBP 7 + ADC ACTIVE/REACTIVE/AP PARENT ENERGIES IBN 8 AND VOLTAGE/CURRENT RMS CALCUL ATION ACTIVE POWER PGA2 VADIV 7:0 % FOR PHASE B VBP 15 APCFNUM 11:0 + (SEE PHASE A FOR DETAILED SIGNAL PATH) ADC VARDIV 7:0 % PGA1 DFC 1 APCF WDIV 7:0 % ICP 9 + ADC 3 DVDD ICN 10 ACTIVE/REACTIVE/AP PARENT ENERGIES APCFDEN 11:0 2 DGND AND VOLTAGE/CURRENT RMS CALCUL ATION PGA2 ADE7758 REGISTERS AND FOR PHASE C VCP 14 SERIAL INTERFACE + 19 CLKIN (SEE PHASE A FOR DETAILED SIGNAL PATH) ADC 20 CLKOUT VN 13 22 24 23 21 18 DIN DOUT SCLK CS IRQ Figure 1. Rev. E 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20042011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04443-001ADE7758 Data Sheet TABLE OF CONTENTS Temperature Measurement ....................................................... 27 Features .............................................................................................. 1 Root Mean Square Measurement............................................. 28 General Description ......................................................................... 1 Active Power Calculation.......................................................... 30 Functional Block Diagram .............................................................. 1 Reactive Power Calculation ...................................................... 35 General Description ......................................................................... 4 Apparent Power Calculation..................................................... 39 Specifications..................................................................................... 5 Energy Registers Scaling ........................................................... 41 Timing Characteristics ................................................................ 6 Waveform Sampling Mode ....................................................... 41 Timing Diagrams.............................................................................. 7 Calibration................................................................................... 42 Absolute Maximum Ratings............................................................ 8 Checksum Register..................................................................... 55 ESD Caution.................................................................................. 8 Interrupts..................................................................................... 55 Pin Configuration and Function Descriptions............................. 9 Using the Interrupts with an MCU.......................................... 56 Terminology .................................................................................... 11 Interrupt Timing ........................................................................ 56 Typical Performance Characteristics ........................................... 12 Serial Interface ............................................................................ 56 Test Circuits..................................................................................... 17 Serial Write Operation............................................................... 57 Theory of Operation ...................................................................... 18 Serial Read Operation................................................................ 59 Antialiasing Filter ....................................................................... 18 Accessing the On-Chip Registers............................................. 59 Analog Inputs.............................................................................. 18 Registers........................................................................................... 60 Current Channel ADC............................................................... 19 Communications Register......................................................... 60 di/dt Current Sensor and Digital Integrator............................... 20 Operational Mode Register (0x13) .......................................... 64 Peak Current Detection............................................................. 21 Measurement Mode Register (0x14) ....................................... 64 Overcurrent Detection Interrupt ............................................. 21 Waveform Mode Register (0x15) ............................................. 65 Voltage Channel ADC ............................................................... 22 Computational Mode Register (0x16)..................................... 66 Zero-Crossing Detection........................................................... 23 Line Cycle Accumulation Mode Register (0x17) ................... 67 Phase Compensation.................................................................. 23 Interrupt Mask Register (0x18) ................................................ 68 Period Measurement.................................................................. 25 Interrupt Status Register (0x19)/Reset Interrupt Status Line Voltage SAG Detection ..................................................... 25 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 Changes to Equation 25................................................................. 34 10/11Rev. D to Rev. E 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 10/08Rev. C to Rev. D Changes to Power-Supply Monitor Section ................................ 27 Changes to Figure 1...........................................................................1 Changes to Figure 62...................................................................... 28 Changes to Phase Sequence Detection Section and Figure 60. 27 Changes to Figure 67...................................................................... 32 Changes to Figure 68...................................................................... 32 Rev. E Page 2 of 72