19-6039 Rev 2 4/12 78M6631 3-Phase Power- Measurement IC DATA SHEET DS 6631 056 DESCRIPTION FEATURES The Teridian 78M6631 is a highly integrated 3-phase < 0.5% Watt Accuracy Over 2000:1 Current power measurement and monitoring system-on-chip Range and Over Temperature (SoC), with a 10 MHz 8051-compatible MPU core and Exceeds IEC 62053/ANSI C12.20 Standards Single Converter Technology containing a 22-bit delta- Voltage Reference < 40 ppm/C sigma converter and 32-bit compute engine (CE). The Six Analog Inputs Supporting 3-Phase Voltage 78M6631 has been designed specifically for a wide and Current Measurement Inputs variety of applications requiring 3-phase power and Pin- or Biselectable Delta or Wye Configuration quality measurements. It supports both Delta and Wye configurations. 22-Bit Delta-Sigma ADC with Independent 32- Bit Compute Engine (CE) At the measurement interface, the device provides six analog inputs including three differential current and three 8-Bit MPU (80515), One Clock Cycle per voltage for interfacing to current and voltage sensors. The Instruction with 4 KB MPU XRAM device provides better than 0.5% accuracy over a wide 128 KB Flash with Security 2000:1 dynamic range. 32 kHz Time Base with Hardware Watchdog The integrated MPU core and 128 KB of flash memory Timer provide a flexible means of configuration, post- 2 UART, I C, and High-Speed Slave SPI Host processing, data formatting, interfacing to host processor via a UART or SPI interface, or using DIO pins for LEDs Interface Options or relay control. Complete firmware is available from 17 General-Purpose 5 V Tolerant I/O Pins Maxim and can be loaded into the IC during Packaged in a RoHS-Compliant (6/6) manufacturing test. Lead(Pb)-Free 56-Pin TQFN Application Firmware Includes (per Phase): o True RMS Current and Voltage Calculations o Active, Reactive, Apparent, Fundamental, Functional Diagrams and Harmonic Power Calculations o Fundamental and Harmonic Current and Voltage Calculations o Line Frequency and Power Factor Calculations o Phase Compensation (18 at 60 Hz) o Built-In Calibration Routines o Programmable Alarm Thresholds o Command Line (UART) Communications o High-Speed SPI Communications Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. Teridian is a trademark and Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLE78M6631 Data Sheet DS 6631 056 Table of Contents 1 Hardware Functional Description......................................................................................................5 1.1 Hardware Overview .....................................................................................................................5 1.2 Device Reset................................................................................................................................7 1.3 Power Management.....................................................................................................................7 1.3.1 Voltage Regulator ............................................................................................................7 1.3.2 Power Fault Management................................................................................................7 1.4 Analog Front-End (AFE) ..............................................................................................................8 1.4.1 Analog Current and Voltage Inputs .................................................................................8 1.5 Digital Computation Engine (CE).................................................................................................9 1.6 80515 MPU Core .......................................................................................................................10 1.6.1 SFRs..............................................................................................................................10 1.7 RAM ...........................................................................................................................................10 1.8 IORAM .......................................................................................................................................10 1.9 Flash ..........................................................................................................................................10 1.9.1 Program Security ...........................................................................................................10 1.10 Oscillator ....................................................................................................................................11 1.11 PLL and Internal Clock Generation............................................................................................11 1.12 Real-Time Clock (RTC)..............................................................................................................11 1.13 Hardware Watchdog Timer........................................................................................................11 1.14 Temperature Sensor..................................................................................................................12 1.15 General Purpose Digital I/O.......................................................................................................12 1.16 D/Y Selection Pin .......................................................................................................................12 1.17 EEPROM Interface ....................................................................................................................12 1.18 SPI Slave Port............................................................................................................................12 1.19 Test Port.....................................................................................................................................13 1.20 UART .........................................................................................................................................13 1.21 In Circuit Emulator (ICE) Port ....................................................................................................14 2 Electrical Specifications...................................................................................................................15 2.1 Absolute Maximum Ratings .......................................................................................................15 2.2 Recommended External Components.......................................................................................16 2.3 Recommended Operating Conditions........................................................................................16 2.4 Performance Specifications .......................................................................................................17 2.4.1 Input Logic Levels..........................................................................................................17 2.4.2 Output Logic Levels .......................................................................................................17 2.4.3 Power-Fault Comparator ...............................................................................................17 2.4.4 Power Supply Monitor....................................................................................................18 2.4.5 Supply Current...............................................................................................................18 2.4.6 Crystal Oscillator............................................................................................................18 2.4.7 Temperature Sensor......................................................................................................19 2.4.8 VREF .............................................................................................................................19 2.4.9 ADC Converter, V3P3A Referenced .............................................................................20 2.5 Timing Specifications.................................................................................................................21 2.5.1 Flash Memory ................................................................................................................21 2.5.2 EEPROM Interface ........................................................................................................21 2.5.3 RESET...........................................................................................................................21 2.5.4 SPI Slave Port................................................................................................................22 3 Packaging ..........................................................................................................................................23 3.1 56-Pin QFN Package.................................................................................................................23 3.2 Pinout.........................................................................................................................................23 3.2.1 56-Pin QFN Package Outline ........................................................................................24 3.2.2 Recommended PCB Land Pattern for the QFN-56 Package........................................25 4 Pin Descriptions................................................................................................................................26 2 Rev 2