Rainbow-electronics 78M6631 User Manual

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78M6631
3-Phase Power
-
Measurement IC
DATA SHEET
DS_6631_056
Rev 1 1
DESCRIPTION
The Teridian 78M6631 is a highly integrated 3-phase
power measurement and monitoring system-on-chip
(SoC), with a 10 MHz 8051-compatible MPU core and
Single Converter Technology® containing a 22-bit delta-
sigma converter and 32-bit compute engine (CE). The
78M6631 has been designed specifically for a wide
variety of applications requiring 3-phase power and
quality measurements. It supports both Delta and Wye
configurations.
At the measurement interface, the device provides six
analog inputs including three differential current and three
voltage for interfacing to current and voltage sensors. The
device provides better than 0.5% accuracy over a wide
2000:1 dynamic range.
The integrated MPU core and 128 KB of flash memory
provide a flexible means of configuration, post-
processing, data formatting, interfacing to host processor
via a UART or SPI interface, or using DIO pins for LEDs
or relay control. Complete firmware is available from
Maxim and can be loaded into the IC during
manufacturing test.
FEATURES
< 0.5% Watt Accuracy Over 2000:1 Current
Range and Over Temperature
Exceeds IEC 62053/ANSI C12.20 Standards
Voltage Reference < 40 ppm/°C
Six Analog Inputs Supporting 3-Phase Voltage
and Current Measurement Inputs
Pin- or Biselectable Delta or Wye Configuration
22-Bit Delta-Sigma ADC with Independent 32-
Bit Compute Engine (CE)
8-Bit MPU (80515), One Clock Cycle per
Instruction with 4 KB MPU XRAM
128 KB Flash with Security
32 kHz Time Base with Hardware Watchdog
Timer
UART, I
2
C, and High-Speed Slave SPI Host
Interface Options
17 General-Purpose 5 V Tolerant I/O Pins
Packaged in a RoHS-Compliant (6/6)
Lead(Pb)-Free 56-Pin TQFN
Application Firmware Includes (per Phase):
o True RMS Current and Voltage Calculations
o Active, Reactive, Apparent, Fundamental,
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
Teridian is a trademark and Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc.
19-6039; Rev 1; 1/12
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Summary of Contents

Page 1 - FEATURES

78M6631 3-Phase Power- Measurement IC DATA SHEET DS_6631_056 Rev 1 1 DESCRIPTION The Teridian™ 78M6631 is a highly integrated 3-phase po

Page 2 - Table of Contents

78M6631 Data Sheet DS_6631_056 10 Rev 1 1.6 80515 MPU Core The 78M6631 includes an 80515 MPU (8-bit, 8051-compatible) that processes most instruc

Page 3

DS_6631_056 78M6631 Data Sheet Rev 1 11 V3P3V3P3 -400mVV3P3 - 10mVVBIAS0VBatterymodesNormaloperation,WDTenabledWDT dis-abledV11.10 Oscillator The

Page 4 - Figures

78M6631 Data Sheet DS_6631_056 12 Rev 1 1.14 Temperature Sensor The device includes an on-chip temperature sensor for determining the temperature

Page 5 - 1.1 Hardware Overview

DS_6631_056 78M6631 Data Sheet Rev 1 13 Table 1: SPI Command Description Command Description 11xx xxxx ADDR D0 ... DN Output data on PSDO is read

Page 6 - 6 Rev 1

78M6631 Data Sheet DS_6631_056 14 Rev 1 1.21 In-Circuit Emulator (ICE) Port The 78M6631 implements an In-Circuit Emulator (ICE) port for debug an

Page 7 - 1.3 Power Management

DS_6631_056 78M6631 Data Sheet Rev 1 15 2 Electrical Specifications 2.1 Absolute Maximum Ratings Table 2 shows the absolute maximum ranges for

Page 8 - 1.4 Analog Front-End (AFE)

78M6631 Data Sheet DS_6631_056 16 Rev 1 2.2 Recommended External Components Table 3: Recommended External Components Name From To Function Value

Page 9

DS_6631_056 78M6631 Data Sheet Rev 1 17 2.4 Performance Specifications 2.4.1 Input Logic Levels Table 5: Input Logic Levels Parameter Condition

Page 10 - 1.9 Flash

78M6631 Data Sheet DS_6631_056 18 Rev 1 2.4.4 Power Supply Monitor Table 8: Power Supply Monitor Performance Specifications (BME= 1) Parameter Co

Page 11 - 1.12 Real-Time Clock (RTC)

DS_6631_056 78M6631 Data Sheet Rev 1 19 2.4.7 Temperature Sensor Table 11 shows the performance for the temperature sensor. The LSB values do no

Page 12 - 1.18 SPI Slave Port

78M6631 Data Sheet DS_6631_056 2 Rev 1 Table of Contents 1 Hardware Functional Description ...

Page 13 - 1.20 UART

78M6631 Data Sheet DS_6631_056 20 Rev 1 2.4.9 ADC Converter, V3P3A Referenced Table 13 shows the performance specifications for the ADC converter

Page 14

DS_6631_056 78M6631 Data Sheet Rev 1 21 2.5 Timing Specifications 2.5.1 Flash Memory Table 14: Flash Memory Timing Specifications Parameter Con

Page 15 - 2 Electrical Specifications

78M6631 Data Sheet DS_6631_056 22 Rev 1 2.5.4 SPI Slave Port Table 17: SPI Slave Port Timing Parameter Condition Min Typ Max Unit tSPIcycPCLK cyc

Page 16

DS_6631_056 78M6631 Data Sheet Rev 1 23 3 Packaging 3.1 56-Pin QFN Package 3.2 Pinout 1Teridian78M6631234567891011121314151631322627282930181

Page 17 - 2.4.2 Output Logic Levels

78M6631 Data Sheet DS_6631_056 24 Rev 1 3.2.1 56-Pin QFN Package Outline

Page 18 - 2.4.6 Crystal Oscillator

DS_6631_056 78M6631 Data Sheet Rev 1 25 3.2.2 Recommended PCB Land Pattern for the QFN-56 Package Figure 7: PCB Land Pattern for QFN-56 Packa

Page 19 - 2.4.8 VREF

78M6631 Data Sheet DS_6631_056 26 Rev 1 4 Pin Descriptions 4.1 Power and Ground Pins Table 18: Power and Ground Pins Name Type Circuit Descripti

Page 20 - L = FIR length

DS_6631_056 78M6631 Data Sheet Rev 1 27 4.3 Digital Pins Table 20: Digital Pins Name Type Circuit Description DIO3 I/O 3, 4 Dedicated DIO pin.

Page 21 - 2.5 Timing Specifications

78M6631 Data Sheet DS_6631_056 28 Rev 1 5 I/O Equivalent Circuits Oscillator Equivalent CircuitType 8:Oscillator I/ODigital Input Equivalent Circ

Page 22

DS_6631_056 78M6631 Data Sheet Rev 1 29 6 Ordering Information Table 21: Ordering Information Part Part Description (Package) Flash Size Packagin

Page 23 - Teridian

DS_6631_056 78M6631 Data Sheet Rev 1 3 4.1 Power and Ground Pins ...

Page 24

DS_6631_056 78M6631 Data Sheet 30 Rev 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a M

Page 25

78M6631 Data Sheet DS_6631_056 4 Rev 1 Figures Figure 1: 78M6631 IC Functional Block Diagram ...

Page 26 - 4 Pin Descriptions

DS_6631_056 78M6631 Data Sheet Rev 1 5 1 Hardware Functional Description 1.1 Hardware Overview The Teridian 78M6631 single-chip power measuremen

Page 27 - 4.3 Digital Pins

78M6631 Data Sheet DS_6631_056 6 Rev 1 ∆Σ ADCCONVERTERVREFMUXPXINXOUTVREFRESETV1UARTTXRXDIGITAL I/OPOWER FAULTGNDDV3P3AV3P3DVOLTREG2.5V to LogicTM

Page 28 - 5 I/O Equivalent Circuits

DS_6631_056 78M6631 Data Sheet Rev 1 7 1.2 Device Reset When the RESET pin is pulled high, all digital activity stops. Only the oscillator and RT

Page 29 - 7 Contact Information

78M6631 Data Sheet DS_6631_056 8 Rev 1 1.4 Analog Front-End (AFE) The AFE functions as a data acquisition system, controlled by the MPU. The main

Page 30 - Revision History

DS_6631_056 78M6631 Data Sheet Rev 1 9 1.5 Digital Computation Engine (CE) The CE, a dedicated 32-bit digital signal processor, performs the back

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