MAX78615+LMU Isolated Energy Measurement Processor for Load Monitoring Units BENEFITS AND FEATURES GENERAL DESCRIPTION Best-in-Class Embedded Algorithms Support The MAX78615+LMU is an isolated energy measurement Highly Accurate Electricity Measurements processor (EMP) for load monitoring and control of any 2-wire Voltage, Current and Frequency single-phase or 3-wire split-phase (120/180) AC circuit. It provides flexible sensor configuration of up to two MAX78700 Active, Reactive and Apparent (four analog inputs) and numerous host interface options for Power/Energy easy integration into any system architecture. Power Quality Measurements including Peak Current and Harmonic Content The internal 24-bit processor and field upgradeable firmware Digital Temperature Compensation performs all the necessary signal processing, compensation, and data formatting for accurate real-time measurement. Energy Configurable Device Provides Design Flexibility accumulation, alarm monitoring, and fault detection schemes Nonvolatile Storage of Calibration and minimize the overhead requirements of the host interface Configuration Parameters and/or network. The integrated flash memory also provides for 2 SPI, I C, and UART Interface Options nonvolatile storage of input configurations and calibration Configurable I/O Pins for Alarm Signaling, coefficients. Address Pins, or User Control APPLICATIONS Highly Integrated Features Support Compact Building Automation Systems (Commercial, Industrial) Designs and Reduced Bill of Materials Inverters and Renewable Energy Systems Small 24-TQFN Package Level 1 and 2 EV Charging Systems Internal or External Oscillator Timing Grid-Friendly Appliances and Smart Plugs References Remote ADC Interfaces Provide Cost- Effective and Reliable Isolation Quick Calibration Routines Minimize Manufacturing (System) Cost Digital Temperature Compensation Measurement UART Processor Host MAX78700 Pulse Interface Digital XFMR RAM SPI I/O Interface Load Relay(s) MAX78700 2 FLASH I C MAX78615+LMU For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6571 Rev 2 1/15 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. MAX78615+LMU Data Sheet Table of Contents ABSOLUTE MAXIMUM RATINGS ........................................................................................................................... 5 RECOMMENDED EXTERNAL COMPONENTS ......................................................................................................... 5 RECOMMENDED OPERATING CONDITIONS ......................................................................................................... 5 PERFORMANCE SPECIFICATIONS .......................................................................................................................... 6 Pin Configuration ................................................................................................................................................... 9 Package Information ........................................................................................................................................... 10 On-Chip Resources Overview ............................................................................................................................... 11 Block Diagram ..................................................................................................................................................... 11 Clock Management ............................................................................................................................................. 12 Power-On and Reset Circuitry ............................................................................................................................ 13 Watchdog Timer ................................................................................................................................................. 13 Pulse Transformer Interface ............................................................................................................................... 14 24-Bit Energy Measurement Processor (EMP) ................................................................................................... 14 Flash and RAM ......................................................................................................................................... 14 Multipurpose DIOs .............................................................................................................................................. 14 Communication Interface ........................................................................................................................ 14 Functional Description and Operation ................................................................................................................. 15 Measurement Interface ...................................................................................................................................... 15 AFE Input Multiplexer .............................................................................................................................. 15 High Pass Filters and Offset Removal....................................................................................................... 16 Gain Correction ........................................................................................................................................ 17 Die Temperature Compensation .............................................................................................................. 17 Phase Compensation ............................................................................................................................... 18 Voltage Input Configuration..................................................................................................................... 19 Current Input Configuration .................................................................................................................... 21 Data Refresh Rates ............................................................................................................................................. 23 Scaling Registers ................................................................................................................................................. 23 Calibration Routines ........................................................................................................................................... 24 Voltage and Current Gain Calibration ...................................................................................................... 24 Offset Calibration ..................................................................................................................................... 24 Die Temperature Calibration ................................................................................................................... 24 Voltage Channel Measurements ........................................................................................................................ 25 Quadrature Voltage ................................................................................................................................. 25 Voltage Frequency ................................................................................................................................... 25 Peak Voltage ............................................................................................................................................ 25 RMS Voltage ............................................................................................................................................. 26 Current Channel Measurements ........................................................................................................................ 26 Peak Current ............................................................................................................................................ 26 RMS Current ............................................................................................................................................. 27 Crest Factor .............................................................................................................................................. 27 Power Calculations ............................................................................................................................................. 28 Active Power (P) ....................................................................................................................................... 28 Reactive Power (Q) .................................................................................................................................. 29 Apparent Power (S) .................................................................................................................................. 29 Power Factor (PF) ..................................................................................................................................... 29 Fundamental and Harmonic Calculations ........................................................................................................... 30 Energy Calculations ............................................................................................................................................. 31 Bucket Size for Energy Counters .............................................................................................................. 31 Min/Max Tracking ............................................................................................................................................... 33 Alarm Monitoring ............................................................................................................................................... 34 Rev 2 2