Maxim-integrated 78M6631 User Manual

AVAILABLE USER GUIDE 78M6631 Firmware Description Document October 10, 2011 Rev 2 UG_6631_078

78M6631 Firmware Description Document UG_6631_078 10 Rev 2 2.2.4 Active, Reactive and Apparent Power Calculation Figure 5 shows the signal pro

UG_6631_078 78M6631 Firmware Description Document Rev 2 11 2.2.5 Voltage and Current Harmonics and Fundamental Measurement The 78M6631 firmware

78M6631 Firmware Description Document UG_6631_078 12 Rev 2 2.2.7 Power Factor Calculation The 78M6631 provides a direct power factor measureme

UG_6631_078 78M6631 Firmware Description Document Rev 2 13 2.2.11 Sine and Cosine Reference An internal Sine/Cosine oscillator generates wavefor

78M6631 Firmware Description Document UG_6631_078 14 Rev 2 2.3 Configuration and Control 2.3.1 Input Registers The following parameters are c

UG_6631_078 78M6631 Firmware Description Document Rev 2 15 2.3.5 Calibration As with any measurement system, there are also multiple sets of coe

78M6631 Firmware Description Document UG_6631_078 16 Rev 2 To calibrate the voltage and current the following steps are required: • AC Source

UG_6631_078 78M6631 Firmware Description Document Rev 2 17 3 Serial Peripheral Interface (SPI) The 78M6631 has an on-chip SPI interface. The int

78M6631 Firmware Description Document UG_6631_078 18 Rev 2 4 Serial Communication and CLI The serial communication with the 78M6631 takes plac

UG_6631_078 78M6631 Firmware Description Document Rev 2 19 5 Register Descriptions All register are 32 bits (4 bytes) and are on ”longword” (4 b

78M6631 Firmware Description Document UG_6631_078 Maxim Integrated 160 Rio Robles, San Jose, CA 9

78M6631 Firmware Description Document UG_6631_078 20 Rev 2 5.2 Status Register The status register contains alarms and system status flags tha

UG_6631_078 78M6631 Firmware Description Document Rev 2 21 5.3 Measurement Results Register Output CLI Address (hex) LSB SPI Address (hex) LSB

78M6631 Firmware Description Document UG_6631_078 22 Rev 2 Output Register CLI Address (hex) LSB SPI Address (hex) LSB Comment PFA 15A 568

UG_6631_078 78M6631 Firmware Description Document Rev 2 23 5.3.1 High-Rate Results Registers There is a set of registers that are updated at a h

78M6631 Firmware Description Document UG_6631_078 24 Rev 2 5.4 Parameters Configuration These registers are defined as input registers. The va

UG_6631_078 78M6631 Firmware Description Document Rev 2 25 5.4.4 Digital I/O Configuration Input Register CLI Address (Hex) SPI Address (Hex) Ph

78M6631 Firmware Description Document UG_6631_078 26 Rev 2 6 System Connection Diagram Examples This section shows supported 3-phase connectio

UG_6631_078 78M6631 Firmware Description Document Rev 2 27 3-Phase 4-Wire (Shunt) An alternative to the previous configuration, the following fig

78M6631 Firmware Description Document UG_6631_078 28 Rev 2 Non-Isolated Basic Delta Connection (alternative configuration) The system is refere

UG_6631_078 78M6631 Firmware Description Document Rev 2 29 7 Command Line Interface (CLI) Description The 78M6631 firmware implements an interfa

UG_6631_078 78M6631 Firmware Description Document Rev 2 3 Table of Contents1 Introduction ...

78M6631 Firmware Description Document UG_6631_078 30 Rev 2 7.3.1 Individual Address Read The host can request the information in hex or decima

UG_6631_078 78M6631 Firmware Description Document Rev 2 31 7.3.5 Repeat Command The repeat command can be useful for monitoring measurements and

78M6631 Firmware Description Document UG_6631_078 32 Rev 2 8 Contact Information For more information about Maxim products or to check the ava

78M6631 Firmware Description Document UG_6631_078 4 Rev 2 TablesTable 1: Measurement Equations Definitions ...

UG_6631_078 78M6631 Firmware Description Document Rev 2 5 1 Introduction This document describes the 78M6631 firmware (6631_3PH_6S_URT_B21), whi

78M6631 Firmware Description Document UG_6631_078 6 Rev 2 ABCVCVBVALOAD A-CIAPIANIBPIBNICPICNV3P3AABC78M6631LOAD A-BLOAD B-CD/Y Figure 2. Simpl

UG_6631_078 78M6631 Firmware Description Document Rev 2 7 2 Functional Description This section summarizes the functional operation of the 78M66

78M6631 Firmware Description Document UG_6631_078 8 Rev 2 At the end of each accumulation interval, these measurements are provided to the MPU

UG_6631_078 78M6631 Firmware Description Document Rev 2 9 2.2.3 Voltage and Current RMS Calculation As shown in Figure 4, the voltage and curren