EVALUATION KIT AVAILABLE 71M6545T/71M6545HT Energy Meter ICs General Description Benefits and Features SoC Integration and Unique Isolation Technique The 71M6545T/71M6545HT metrology processors are Reduces BOM Cost Without Sacrificing Performance based on Maxim Integrateds 4th-generation metering 0.1% Typical Accuracy Over 2000:1 Current architecture supporting the 71M6xxx series of isolated Range current sensing products that offer drastic reduction in Exceeds IEC 62053/ANSI C12.20 Standards component count, immunity to magnetic tampering, and Four-Quadrant Metering unparalleled reliability. The 71M6545T/71M6545HT inte- 46-64Hz Line Frequency Range with the Same grate our Single Converter Technology with a 22-bit Calibration Phase Compensation (10) delta sigma ADC, a customizable 32-bit computation Independent 32-Bit Compute Engine engine (CE) for core metrology functions, as well as a 64KB Flash, 5KB RAM user-programmable 8051-compatible application proces- Built-In Flash Security sor (MPU) core with 64KB flash and 5KB RAM. SPI Interface to Host with Flash Program Capability An external host processor can access metrology func- Up to Four Pulse Outputs with Pulse Count tions directly through the SPI interface, or alternatively 8-Bit MPU (80515), Up to 5 MIPS (Optional Use) through the embedded MPU core in applications requir- Full-Speed MPU Clock in Brownout Mode ing metrology data capture, storage, and preprocessing Up to 29 Multifunction DIO Pins within the metrology subsystem. In addition, the devices Hardware Watchdog Timer (WDT) integrate an RTC, DIO, and UART. A complete array of UART for AMR or Other Communication Duties 2 ICE and development tools, programming libraries, and I C/MICROWIRE EEPROM Interface reference designs enable rapid development and certi- Innovative Isolation Techno logy (Requires fication of meters that meet all ANSI and IEC electricity Companion 71M6xxx Sensor, also from Maxim Integrated) Eliminates Current Transformers metering standards worldwide. Four Current Sensor Inputs with Selectable The 71M6545T/71M6545HT operate over the industrial tem- Differential Mode perature range and come in a 64-pin lead(Pb)-free package. Selectable Gain of 1 or 8 for One Current Input to Support Neutral Current Shunt High-Speed Wh/VARh Pulse Outputs with Applications Programmable Width Three-Phase Residential, Commercial, and Industrial Digital Temperature Compe nsation Improves System Energy Meters Performance Metrology Compensation Accurate RTC for TOU Functions with Automatic Temperature Compensation for Crystal in All Power Modes Ordering Information and Typical Operating Circuit appear Power Management Extends Battery Life During at end of data sheet. Power Outages Two Battery-Backup Modes - Brownout Mode (BRN) - Sleep Mode (SLP) Wake-Up on Pin Events and Wake-On Timer 1A in Sleep Mode Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. 19-6721 Rev 5 12/1571M6545T/71M6545HT Energy Meter ICs TABLE OF CONTENTS General Description ............................................................................ 1 Applications .................................................................................. 1 Benefits and Features .......................................................................... 1 Absolute Maximum Ratings ...................................................................... 7 Electrical Characteristics ........................................................................ 7 Recommended External Components............................................................. 12 Pin Configuration ............................................................................. 13 Pin Descriptions .............................................................................. 14 Block Diagram ............................................................................... 17 Hardware Description.......................................................................... 18 Analog Front-End (AFE) 18 Signal Input Pins . 20 Input Multiplexer 21 Delay Compensation 22 ADC Preamplifier . 23 Analog-to-Digital Converter (ADC) . 23 FIR Filter . 23 Voltage References . 23 Isolated Sensor Interface . 24 Digital Computation Engine (CE) . 24 Meter Equations 24 Real-Time Monitor 24 Pulse Generators . 25 XPULSE and YPULSE . 25 VPULSE and WPULSE 25 80515 MPU Core 25 Memory Organization and Addressing 25 Program Memory . 26 MPU External Data Memory (XRAM) . 26 MOVX Addressing 26 Dual Data Pointer . 27 Internal Data Memory Map and Access . 27 Special Function Registers . 27 Timers and Counters 27 Interrupts . 29 Interrupt Overview 29 External MPU Interrupts . 30 On-Chip Resources . 30 Maxim Integrated 2 www.maximintegrated.com