78M6610+LMU Energy Measurement Processor for Load Monitoring Units DATA SHEET FEATURES GENERAL DESCRIPTION Four Configurable Analog Inputs for The 78M6610+LMU is an energy measurement processor Monitoring Any Single-Phase Circuit (EMP) for load monitoring and control of any 2-wire single- (2/3-Wire) phase or 3-wire split-phase (120/180 ) AC circuit. It provides flexible sensor configuration of four analog inputs Supports Current Transformers (CT) and and numerous host interface options for easy integration Resistive Shunts into any system architecture. 2 Flexible SPI, I C, or UART Interface Options The internal 24-bit processor and field upgradeable with Configurable I/O Pins for Alarm firmware performs all the necessary signal processing, Signaling, Address Pins, or User Control compensation, and data formatting for accurate real-time measurement. Energy accumulation, alarm monitoring, and Nonvolatile Storage of Calibration and fault detection schemes minimize the overhead Configuration Parameters requirements of the host interface and/or network. The integrated flash memory also provides for nonvolatile Small 24-TQFN Package and Reduced Bill of storage of input configurations and calibration coefficients. Materials APPLICATIONS Internal or External Oscillator Timing Building Automation Systems (Commercial, Industrial) References Inverters and Renewable Energy Systems Quick Calibration Routines Minimize Level 1 and 2 EV Charging Systems Manufacturing (System) Cost Grid-Friendly Appliances and Smart Plugs Single Converter Measurement Front End UART Processor Host Voltage Interface Digital Sensor(s) MUX ADC RAM SPI I/O Current Load Relay(s) Sensor(s) 2 FLASH I C 78M6610+LMU For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6573 Rev 3 10/15 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. 78M6610+LMU Data Sheet Table of Contents Electrical Specifications ............................................................................................................................. 5 ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 5 Recommended External Components .................................................................................................. 5 Recommended Operating Conditions ................................................................................................... 5 Performance Specifications .................................................................................................................. 6 Input Logic Levels ....................................................................................................................... 6 Output Logic Levels .................................................................................................................... 6 Supply Current ............................................................................................................................ 6 Crystal Oscillator ......................................................................................................................... 6 Internal RC Oscillator .................................................................................................................. 6 ADC Converter, V Referenced ................................................................................................ 7 3P3 Timing Specifications ............................................................................................................................ 8 Reset 8 SPI Slave Port ............................................................................................................................. 8 2 I C Slave Port (Note 1) ................................................................................................................ 9 Pin Configuration ...................................................................................................................................... 10 Package Information ........................................................................................................................... 11 On-Chip Resources Overview ................................................................................................................. 12 IC Block Diagram ................................................................................................................................ 12 Clock Management ............................................................................................................................. 13 Power-On and Reset Circuitry ............................................................................................................ 14 Watchdog Timer .................................................................................................................................. 14 Analog Front-End and Conversion ..................................................................................................... 15 24-Bit Energy Measurement Processor (EMP) ................................................................................... 15 Flash and RAM.......................................................................................................................... 15 Multipurpose DIOs .............................................................................................................................. 15 Communication Interface .......................................................................................................... 15 Functional Description and Operation .................................................................................................... 16 Measurement Interface ....................................................................................................................... 16 AFE Input Multiplexer ................................................................................................................ 16 High Pass Filters and Offset Removal ...................................................................................... 17 Gain Correction ......................................................................................................................... 18 Die Temperature Compensation ............................................................................................... 18 Phase Compensation ................................................................................................................ 19 Voltage Input Configuration ....................................................................................................... 20 Current Input Configuration ....................................................................................................... 23 Data Refresh Rates ............................................................................................................................ 26 Scaling Registers ................................................................................................................................ 26 Calibration ........................................................................................................................................... 27 Voltage and Current Gain Calibration ....................................................................................... 27 Offset Calibration ...................................................................................................................... 27 Die Temperature Calibration ..................................................................................................... 27 Voltage Channel Measurements ........................................................................................................ 28 Quadrature Voltage ................................................................................................................... 28 Voltage Frequency .................................................................................................................... 28 Peak Voltage ............................................................................................................................. 28 RMS Voltage ............................................................................................................................. 28 Current Channel Measurements ......................................................................................................... 29 Peak Current ............................................................................................................................. 29 RMS Current ............................................................................................................................. 30 Crest Factor ............................................................................................................................... 30 Power Calculations ............................................................................................................................. 31 2 Rev 3