Single Phase, Multifunction Metering IC with Neutral ...

1 Single Phase, Multifunction Metering IC. with Neutral Current Measurement Data Sheet ADE7953. FEATURES The device incorporates three - ADCs with a high accuracy Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053- energy measurement core. The second input channel simulta- 21, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards neously measures Neutral current and enables tamper detection Measures active, reactive, and apparent energy; sampled and Neutral current billing. The additional channel incorporates waveform; current and voltage rms a complete signal path that allows a full range of measurements. Provides a second current input for Neutral current Each input channel supports independent and flexible gain stages, measurement making the device suitable for use with a variety of current sensors Less than error in active and reactive energy such as current transformers (CTs) and low value shunt resistors.

2 Measurements over a dynamic range of 3000:1 Two on-chip integrators facilitate the use of Rogowski coil sensors. Less than error in instantaneous IRMS measurement The ADE7953 provides access to on-chip meter registers via a over a dynamic range of 1000:1 variety of communication interfaces including SPI, I2C, and UART. Provides apparent energy measurement and instantaneous Two configurable low jitter pulse output pins provide outputs that power readings are proportional to active, reactive, or apparent energy, as well as kHz bandwidth operation current and voltage rms. A full range of power quality information Flexible PGA gain stage (up to 22) such as overcurrent, overvoltage, peak, and sag detection are Includes internal integrators for use with Rogowski coil sensors accessible via the external IRQ pin. Independent active, reactive, SPI, I2C, or UART communication and apparent no-load detections are included to prevent meter GENERAL DESCRIPTION creep.

3 Dedicated reverse power (REVP), zero-crossing voltage (ZX), and zero-crossing current (ZX_I) pins are also provided. The The ADE7953 is a high accuracy electrical energy measurement ADE7953 energy Metering IC operates from a V supply voltage IC intended for Single phase applications. It measures line voltage and is available in a 28-lead LFCSP package. and current and calculates active, reactive, and apparent energy, as well as instantaneous rms voltage and current. FUNCTIONAL BLOCK DIAGRAM. REF RESET VDD VINTA VINTD. AIRMSOS. ADE7953. REF AVAGAIN. X2 AIRMS. LPF. LOW DIGITAL. NOISE AIGAIN INTEGRATOR. PRE-AMP. X2 AVRMS. IAP LPF. PGA ADC. IAN HPF. VRMSOS. APHCAL VGAIN AWGAIN AWATTOS CF1 DEN. VP. PGA ADC. HPF LPF. DFC : CF1. VN. PHASE. A AND B CF2 DEN. ACTIVE, REACTIVE AND. DATA. APPARENT ENERGIES AND AVARGAIN AVAROS. VOLTAGE/CURRENT RMS. IBP CALCULATION FOR PHASE B. COMPUTATIONAL.

4 DFC : CF2. PGA ADC (SEE PHASE A FOR DETAILED. IBN BLOCK FOR TOTAL. DATA PATH). REACTIVE power . CONFIGURATION REVP REVP. AND CONTROL ZX ZX. AGND ZX_I ZX_I. PEAK. UART SPI INTERFACE I2C ANGLE. DGND power FACTOR. SAG. 09320-001. CLKIN CLKOUT IRQ CS MISO/ MOSI/ SCLK. SDA/Tx SCL/Rx Figure 1. Rev. C 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 rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, Box 9106, Norwood, MA 02062-9106, license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 2011 2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

5 Technical Support ADE7953 Data Sheet TABLE OF CONTENTS. Features ..1 Period Measurement .. 36. General Description ..1 Instantaneous Powers and Waveform Sampling .. 37. Functional Block power Factor .. 38. Revision History ..3 Using the Line Cycle Accumulation Mode to Determine the power 38. Timing power Factor with No-Load Detection .. 38. Absolute Maximum Ratings ..8 Angle 39. ESD Caution ..8 No-Load 40. Pin Configuration and Function Setting the No-Load Thresholds .. 40. Typical Performance Characteristics ..11 Active Energy No-Load 40. Test Circuit ..16 Reactive Energy No-Load Detection .. 41. Terminology ..17 Apparent Energy No-Load Detection .. 41. ADE7953 power -Up Procedure ..18 Zero-Crossing Detection .. 43. Required Register Zero-Crossing Output 43. Theory of Zero-Crossing 43. Analog Inputs ..19 Zero-Crossing Timeout .. 44. Analog-to-Digital Conversion ..19 Zero-Crossing 44.

6 Current Channel ADCs ..21 Voltage Sag 45. Voltage Channel Setting the SAGCYC Register .. 45. Reference Circuit ..22 Setting the SAGLVL Register .. 45. Root Mean Square Voltage Sag Interrupt .. 45. Current Channel RMS Calculation ..23 Peak Detection .. 46. Voltage Channel RMS Calculation ..23 Indication of power Direction .. 47. Active power Reverse 47. Sign of Active power Calculation ..25 Sign Indication .. 47. Active Energy Overcurrent and Overvoltage Detection .. 48. Active Energy Accumulation Setting the OVLVL and OILVL Registers .. 48. Reactive power Calculation ..28 Overvoltage and Overcurrent Interrupts .. 48. Sign of Reactive power Alternative Output 49. Reactive Energy Calculation ..29 ADE7953 Interrupts .. 50. Reactive Energy Accumulation Modes ..30 Primary Interrupts (Voltage Channel and Current Channel A) .. 50. Apparent power Calculation ..31. Current Channel B 50.

7 Apparent Energy Communicating with the 51. Ampere-Hour Accumulation ..32. Communication Autodetection .. 51. Energy-to-Frequency Locking the Communication 51. Pulse Output SPI Interface .. 52. Energy I2C 53. Gain Calibration ..34. UART 55. Phase Calibration ..34. Communication Verification and Security .. 57. Offset Calibration ..35. Rev. C | Page 2 of 72. Data Sheet ADE7953. Write Protection ..57 ADE7953 Register Descriptions .. 62. Communication Layout Guidelines .. 68. Checksum Register ..58 Outline Dimensions .. 69. ADE7953 Registers ..60 Ordering Guide .. 69. REVISION HISTORY. 12/2016 Rev. B to Rev. C Changes to Table 15 .. 61. Changed CP-28-6 to CP-28-10 .. Throughout Changes to Table 18 .. 62. Changes to Figure 9 Added Layout Guidelines 68. Changes to Period Measurement Section ..36 Updated Outline 69. Updated Outline Dimensions ..69. Changes to Ordering Guide ..69 11/2011 Rev.

8 0 to Rev. A. Changes to Figure 1 .. 1. 11/2013 Rev. A to Rev. B Changes to Table 1 .. 3. Changes to Features Section .. 1 Changes to Absolute Maximum Ratings Section .. 8. Changed Input Clock Frequency from MHz (Max) to Changes to Table 5 .. 9. MHz (Min) MHz (Typ) MHz (Max) .. 5 Replaced Typical Performance Characteristics Section .. 11. Changed tDAV from 80 ns (Min) to 80 ns (Max) .. 6 Changes to Figure 35 .. 16. Changed tHD;DAT (Min) from 0 s to s .. 7 Added ADE7953 power -Up Procedure Section .. 18. Changes to EPAD 9 Changes to Voltage Channel Section .. 19. Changes to Figure 35 ..16 Changes to Current Channel RMS Calculation Section and Changes to Current Channel ADCs Section and Voltage Voltage Channel RMS Calculation Section .. 23. Channel ADC Section ..21 Changes to Active power Calculation Section .. 24. Changes to Figure 45 ..24 Changes to Active Energy Integration Time Under Steady Changes to Figure 46.

9 25 Load Section .. 25. Changes to Current Channel Gain Adjustment Section ..34 Changes to Reactive power Calculation Section .. 28. Changes to RMS Offsets Section ..35 Changes to Reactive Energy Integration Time Under Steady Changes to Equation 37 ..38 Load Section .. 29. Changes to First Paragraph in No-Load Detection Section ..40 Changes to Figure 65 .. 47. Changes to Communication Autodetection Section and Changes to Write Protection Section .. 57. Locking the Communication Interface Section ..51 Replaced Checksum Register Section and added Figure 75 and Changes to I2C Interface Figure 76 .. 58. Changes to Write Protection Changes to Table 12 .. 59. Changes to Figure 76 ..58 Changes to Table 14 .. 60. Changes to Table 12 ..59 Changes to Table 15 .. 61. Changes to Table 13 and Table 14 ..60 Replaced Interrupt Enable Section and Interrupt Status Registers Section .. 66. 2/2011 Revision 0: Initial Version Rev.

10 C | Page 3 of 72. ADE7953 Data Sheet SPECIFICATIONS. VDD = V 10%, AGND = DGND = 0 V, on-chip reference, CLKIN = MHz, TMIN to TMAX = 40 C to +85 C, Register Address 0x120. set to 0x30, unless otherwise noted. Table 1. Parameter Min Typ Max Unit Test Conditions/Comments PHASE ERROR BETWEEN CHANNELS Line frequency = 45 Hz to 65 Hz, HPF on power Factor = Capacitive Degrees Phase lead 37 . power Factor = Inductive Degrees Phase lag 60 . ACTIVE ENERGY MEASUREMENT. Active Energy Measurement Error % Over a dynamic range of 3000:1, PGA = 1, (Current Channel A) PGA = 22, integrator off Active Energy Measurement Error % Over a dynamic range of 1000:1, PGA = 1, (Current Channel B) PGA = 16, integrator off AC power Supply Rejection VDD = V 120 mV rms, 100 Hz Output Frequency Variation %. DC power Supply Rejection VDD = V 330 mV dc Output Frequency Variation %. Active Energy Measurement Bandwidth kHz 3 db REACTIVE ENERGY MEASUREMENT.