Polyphase Multifunction Energy Metering IC Data Sheet ADE7854A/ADE7858A/ADE7868A/ADE7878A The ADE7878A can also perform fundamental-only active and FEATURES reactive energy measurement and rms calculations. A fixed function Highly accurate supports EN 50470-1, EN 50470-3, digital signal processor (DSP) executes the signal processing. The IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards DSP program is stored in the internal ROM memory. Compatible with 3-phase, 3- or 4-wire (delta or wye) meters, and other 3-phase services The ADE7854A/ADE7858A/ADE7868A/ADE7878A can Supplies total (fundamental and harmonic) active, reactive, measure active, reactive, and apparent energy in various 3-phase and apparent energy and fundamental active/reactive configurations, such as wye or delta services, with both three and energy on each phase and on the overall system four wires. Aside from regular rms measurements, which are 0.1% error (typical) in active and reactive energy over a updated every 8 kHz, these devices measure low ripple rms values, dynamic range of 1000 to 1 at T = 25C A which are averaged internally and updated every 1.024 sec. The 0.2% error (typical) in active and reactive energy over a devices provide system calibration features for each phase, that dynamic range of 3000 to 1 at T = 25C A is, rms offset correction, phase calibration, and gain calibration. Averaged rms measurements available in low ripple rms The CF1, CF2, and CF3 logic outputs provide a wide selection registers of power information. All four devices provide total active and Supports current transformer and di/dt current sensors apparent powers, as well as the sum of the current rms values Dedicated ADC channel for neutral current input the ADE7858A, ADE7868A, and ADE7878A also provide total Estimated neutral current measurement by calculating the reactive powers whereas the ADE7878A provides fundamental rms of the sum of the phase currents in all 3 phases active and reactive powers. 0.1% error (typical) in voltage and current rms over a The ADE7854A/ADE7858A/ADE7868A/ADE7878A contain dynamic range of 1000 to 1 at T = 25C A waveform sampling registers that allow access to all ADC Supplies sampled waveform data on all 3 phases and on outputs. The devices also incorporate power quality neutral current measurements, such as short duration low or high voltage Selectable no load thresholds for total and fundamental detection, short duration high current variation, line voltage active and reactive powers, as well as for apparent powers period measurement, and angles between phase voltages and Highly accurate low power battery mode phase current currents. monitoring for antitampering detection Battery supply input for missing neutral operation 2 Two serial interfaces, serial peripheral interface (SPI) and I C, Phase angle measurements in current and voltage channels can communicate with the devices. A dedicated high speed Calibration frequency (CF) output directly drives LED and interface, the high speed data capture (HSDC) port, can be used opto-isolators 2 in conjunction with I C to provide access to the ADC outputs Reference: 1.2 V (drift of 5 ppm/C typical) with external and real-time power information. overdrive capability The devices have two interrupt request pins, IRQ0 and IRQ1, Single 3.3 V supply to indicate that an enabled interrupt event has occurred. For 40-lead, Pb-free lead frame chip scale package (LFCSP) the ADE7868A/ADE7878A, three specially designed low power Operating temperature: 40C to +85C 2 modes ensure the continuity of energy accumulation when the Flexible I C, SPI, and HSDC serial interfaces ADE7868A/ADE7878A are in a tampering situation. GENERAL DESCRIPTION Table 1 lists each device and its functions. These devices are The ADE7854A/ADE7858A/ADE7868A/ADE7878A are high available in 40-lead, Pb-free LFCSP packages. accuracy, 3-phase electrical energy measurement ICs with serial Table 1. Device Comparison interfaces and three flexible pulse outputs. The devices incorporate Tamper second-order - analog-to-digital converters (ADCs), a digital I RMS, Fundamental Detect and integrator, reference circuitry, and all signal processing V RMS, WATT and Low Power required to perform total (fundamental and harmonic) active, Part No. WATT VAR and VA di/dt VAR Modes reactive (ADE7858A, ADE7868A, and ADE7878A), and ADE7854AYes No Yes Yes No No ADE7858AYes Yes Yes Yes No No apparent energy measurement and rms calculations. ADE7868AYes Yes Yes Yes No Yes ADE7878AYes Yes Yes Yes Yes Yes Rev. D 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. Tel: 781.329.4700 20202021 Analog Devices, Inc. All rights reserved. No license is granted by implication or otherwise under any patent or patent rights of Analog Technical Support www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. ADE7854A/ADE7858A/ADE7868A/ADE7878A Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Reference Circuit ........................................................................ 42 General Description ......................................................................... 1 Digital Signal Processor ............................................................. 43 Revision History ............................................................................... 3 Root Mean Square Measurement ............................................. 44 Functional Block Diagrams ............................................................. 4 Active Power Calculation .......................................................... 48 Specificat ions ..................................................................................... 8 Reactive Power CalculationADE7858A, ADE7868A, ADE7878A Only ......................................................................... 54 Timing Characteristics .............................................................. 11 Apparent Power Calculation ..................................................... 58 Absolute Maximum Ratings .......................................................... 14 Waveform Sampling Mode ....................................................... 61 Thermal Resistance .................................................................... 14 Energy to Frequency Conversion ............................................. 61 ESD Caution ................................................................................ 14 No Load Condition .................................................................... 65 Pin Configuration and Function Descriptions ........................... 15 Checksum Register..................................................................... 66 Typical Performance Characteristics ........................................... 17 Interrupts ..................................................................................... 67 Test Circuit ...................................................................................... 20 Applications Information .............................................................. 69 Terminology .................................................................................... 21 Quick Setup of Devices as Energy Meters .............................. 69 Power Management ........................................................................ 22 Crystal Circuit ............................................................................ 69 PSM0 Normal Power Mode (All Devices) .............................. 22 Layout Guidelines....................................................................... 70 PSM1 Reduced Power Mode (ADE7868A and ADE7878A Only) ............................................................................................ 22 ADE7878A Evaluation Board ................................................... 70 PSM2 Low Power Mode (ADE7868A and ADE7878A Only) Die Version .................................................................................. 70 ....................................................................................................... 22 Silicon Anomaly ............................................................................. 71 PSM3 Sleep Mode (All Devices) ............................................... 24 ADE7854A/ADE7858A/ADE7868A/ADE7878A Power-Up Procedure .................................................................. 26 Functionality Issues .................................................................... 71 Hardware Reset ........................................................................... 26 Functionality Issues .................................................................... 71 Software Reset ............................................................................. 27 Serial Interfaces ............................................................................... 72 Theory of Operation ...................................................................... 28 Serial Interface Selection ........................................................... 72 Analog Inputs .............................................................................. 28 Communication Verification .................................................... 72 2 Analog-to-Digital Conversion .................................................. 28 I C-Compatible Interface .......................................................... 72 Current Channel ADC............................................................... 29 SPI-Compatible Interface .......................................................... 74 di/dt Current Sensor and Digital Integrator ............................... 31 HSDC Interface .......................................................................... 76 Voltage Channel ADC ............................................................... 32 Register List ..................................................................................... 78 Changing the Phase Voltage Datapath .................................... 33 Outline Dimensions ....................................................................... 96 Power Quality Measurements ................................................... 33 Ordering Guide .......................................................................... 96 Phase Compensation .................................................................. 41 Rev. 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