MAX78630+PPM Energy Measurement Processor for Polyphase Monitoring Systems DATA SHEET GENERAL DESCRIPTION BENEFITS AND FEATURES The MAX78630+PPM is an energy measurement processor Six Configurable Analog Inputs for Monitoring for polyphase power-monitoring systems. It is designed for a Variety of Delta- and Wye-Connected real-time monitoring for a variety of typical three-phase Three-Phase Topologies configurations in industrial applications. It is available in a Supports Current Transformers (CTs), 32-pin TQFN package with an exposed pad. Resistive Shunts, and Rogowski Coils The MAX78630+PPM provides up to six analog inputs for Delta-Sigma ADC with Precision Voltage interfacing to voltage and current sensors. Scaled voltages Reference and On-Chip Temperature Sensor from the sensors are fed to the single converter front-end Internal or External Oscillator Timing using a high-resolution delta-sigma converter. Supported Reference current sensors include current transformers (CTs), 2 Rogowski coils, and resistive shunts. SPI, I C, or UART Interface Options with Configurable I/O Pins for Alarm Signaling, An embedded 24-bit measurement processor and firmware Address Pins, or User Control perform all necessary computations and data formatting for 24-Bit Measurement Processor with accurate reporting to the host. With integrated flash memory for storing nonvolatile calibration coefficients and Integrated Firmware and Flash Memory for device configuration settings, the MAX78630+PPM can be Nonvolatile Storage of Calibration and a completely autonomous solution. Configuration Parameters Supports Extraction of Individual Harmonics The MAX78630+PPM is designed to interface to the host 2 processor via the UART interface. Alternatively, SPI or I C Small 32-TQFN Package and Reduced Bill of can also be used. Materials APPLICATIONS Building Automation Systems (Commercial, Industrial) Inverters and Renewable Energy Systems Single Converter Measurement Front End UART Voltage Processor Sensors Digital Host MUX ADC RAM SPI I/O Controller Current Sensors FLASH I2C MAX78630+PPM For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6679 Rev 0 4/13 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. MAX78630+PPM Data Sheet Table of Contents Electrical Specifications ............................................................................................................................. 4 Absolute Maximum Ratings .................................................................................................................. 4 Recommended External Components .................................................................................................. 4 Recommended Operating Conditions ................................................................................................... 4 Performance Specifications .................................................................................................................. 5 Input Logic Levels ....................................................................................................................... 5 Output Logic Levels .................................................................................................................... 5 Supply Current ............................................................................................................................ 5 Crystal Oscillator ......................................................................................................................... 5 Internal RC Oscillator .................................................................................................................. 5 ADC Converter, V Referenced ................................................................................................ 6 3P3 Timing Specifications ............................................................................................................................ 7 Reset ........................................................................................................................................ 7 SPI Slave Port ............................................................................................................................. 7 2 I C Slave Port .............................................................................................................................. 8 Pin Configuration ........................................................................................................................................ 9 Package Information ........................................................................................................................... 11 On-Chip Resources Overview ................................................................................................................. 12 IC Block Diagram ................................................................................................................................ 12 Clock Management ............................................................................................................................. 13 Power-On Reset, Watchdog-Timer, and Reset Circuitry .................................................................... 14 Analog Front-End and Conversion ..................................................................................................... 15 24-Bit Measurement Processor .......................................................................................................... 17 Flash and RAM ................................................................................................................................... 17 Digital I/O Pins .................................................................................................................................... 17 Communication Interfaces .................................................................................................................. 17 Functional Description and Operation .................................................................................................... 18 Measurement Interface ....................................................................................................................... 18 AFE Input Multiplexer ................................................................................................................ 18 Highpass Filters and Offset Removal ....................................................................................... 19 Enabling the Software Integrators for Rogowski Coil Current Sensors .................................... 19 Gain Correction ......................................................................................................................... 19 Die Temperature Compensation ............................................................................................... 20 Phase Compensation ................................................................................................................ 20 Voltage Input Configuration ....................................................................................................... 21 Current Input Configuration ....................................................................................................... 23 Current Input Flowchart ............................................................................................................. 24 Data Refresh Rates ............................................................................................................................ 25 Scaling Registers and Result Formats ............................................................................................... 25 Calibration ........................................................................................................................................... 26 Voltage and Current Gain Calibration ....................................................................................... 26 Offset Calibration ...................................................................................................................... 26 Die Temperature Calibration ..................................................................................................... 26 Voltage Channel Measurements ........................................................................................................ 27 RMS Voltage ............................................................................................................................. 27 Line Frequency.......................................................................................................................... 27 Current Channel Measurements ......................................................................................................... 28 Peak Current ............................................................................................................................. 28 RMS Current ............................................................................................................................. 28 Current and Voltage Imbalance .......................................................................................................... 29 Power Calculations ............................................................................................................................. 30 Active Power (P) ....................................................................................................................... 30 Reactive Power (Q) ................................................................................................................... 31 2 Rev 0