Polyphase Multifunction Energy Metering IC with Harmonic and Fundamental Information Data Sheet ADE7854/ADE7858/ADE7868/ADE7878 harmonic) active, reactive (ADE7878, ADE7868, and FEATURES ADE7858), and apparent energy measurement and rms calcu- Highly accurate supports EN 50470-1, EN 50470-3, lations, as well as fundamental-only active and reactive energy IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards measurement (ADE7878) and rms calculations. A fixed function Compatible with 3-phase, 3- or 4-wire (delta or wye), and digital signal processor (DSP) executes this signal processing. other 3-phase services The DSP program is stored in the internal ROM memory. Supplies total (fundamental and harmonic) active, reactive (ADE7878, ADE7868, and ADE7858 only), 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 = 25C 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 = 25C 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 and values, and fundamental active and reactive powers. ADE7878 only) 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 = 25C 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 2 SPI and I C, 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 2 (HSDC) port, can be used in conjunction with I C to provide antitampering detection (ADE7868 and ADE7878 only) access to the ADC outputs and real-time power information. Battery supply input for missing neutral operation The ADE7854/ADE7858/ADE7868/ADE7878 also have two Phase angle measurements in both current and voltage interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled channels with a typical 0.3 error interrupt event has occurred. For the ADE7868/ADE7878, three Wide-supply voltage operation: 2.4 V to 3.7 V specially designed low power modes ensure the continuity of Reference: 1.2 V (drift +5 ppm/C typical) with external energy accumulation when the ADE7868/ADE7878 is in a tam- overdrive capability pering situation. See Table 1 for a quick reference chart listing Single 3.3 V supply each part and its functions. The ADE78xx are available in the 40-lead lead frame chip scale package (LFCSP), Pb-free 40-lead LFCSP, Pb-free package. Operating temperature: 40C to +85C 2 Flexible I C, SPI, and HSDC serial interfaces Table 1. Part Comparison IRMS, Tamper APPLICATIONS 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 ADE7868 Yes Yes Yes Yes No Yes The ADE7854/ADE7858/ADE7868/ADE7878 are high accuracy, ADE7858 Yes Yes Yes Yes No No 3-phase electrical energy measurement ICs with serial interfaces ADE7854 Yes No Yes Yes No No and three flexible pulse outputs. The ADE78xx devices incorporate second-order sigma-delta (-) a nalog-to-digital converters (ADCs), a digital integrator, reference circuitry, and all of the signal processing required to perform total (fundamental and Rev. H Document Feedback 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 20102014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. ADE7854/ADE7858/ADE7868/ADE7878 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Power Quality Measurements ................................................... 34 Applications ....................................................................................... 1 Phase Compensation ................................................................. 39 General Description ......................................................................... 1 Reference Circuit ........................................................................ 41 Revision History ............................................................................... 3 Digital Signal Processor ............................................................. 42 Functional Block Diagrams ............................................................. 5 Root Mean Square Measurement ............................................. 43 Specifications ..................................................................................... 9 Active Power Calculation .......................................................... 47 Timing Characteristics .............................................................. 12 Reactive Power CalculationADE7858, ADE7868, ADE7878 Only .............................................................................................. 52 Absolute Maximum Ratings .......................................................... 15 Apparent Power Calculation ..................................................... 57 Thermal Resistance .................................................................... 15 Waveform Sampling Mode ....................................................... 60 ESD Caution ................................................................................ 15 Energy-to-Frequency Conversion............................................ 60 Pin Configuration and Function Descriptions ........................... 16 No Load Condition .................................................................... 64 Typical Performance Characteristics ........................................... 18 Checksum Register..................................................................... 65 Test Circuit ...................................................................................... 21 Interrupts ..................................................................................... 66 Terminology .................................................................................... 22 Serial Interfaces .......................................................................... 68 Power Management ........................................................................ 23 Quick Setup as Energy Meter ................................................... 75 PSM0Normal Power Mode (All Parts) ................................ 23 Layout Guidelines....................................................................... 75 PSM1Reduced Power Mode (ADE7868, ADE7878 Only) 23 Crystal Circuit ............................................................................ 76 PSM2Low Power Mode (ADE7868, ADE7878 Only) ....... 23 ADE7878 Evaluation Board ...................................................... 76 PSM3Sleep Mode (All Parts) ................................................ 24 Die Version .................................................................................. 76 Power-Up Procedure .................................................................. 26 Silicon Anomaly ............................................................................. 77 Hardware Reset ........................................................................... 27 ADE7854/ADE7858/ADE7868/ADE7878 Functionality Software Reset Functionality .................................................... 27 Issues ............................................................................................ 77 Theory of Operation ...................................................................... 28 Functionality Issues .................................................................... 77 Analog Inputs .............................................................................. 28 Section 1. ADE7854/ADE7858/ADE7868/ADE7878 Analog-to-Digital Conversion .................................................. 28 Functionality Issues .................................................................... 79 Current Channel ADC............................................................... 29 Registers List ................................................................................... 80 di/dt Current Sensor and Digital Integrator .............................. 31 Outline Dimensions ....................................................................... 98 Voltage Channel ADC ............................................................... 32 Ordering Guide .......................................................................... 98 Changing Phase Voltage Datapath ........................................... 33 Rev. H Page 2 of 100