78M6631-IMR/F [MAXIM]

3-Phase Power-Measurement IC; 3相电源测量IC
78M6631-IMR/F
元器件型号: 78M6631-IMR/F
生产厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述和应用:

3-Phase Power-Measurement IC
3相电源测量IC

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19-6039; Rev 2; 4/12
78M6631
3-Phase Power-
Measurement IC
DATA SHEET
DS_6631_056
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.
Rev 2
1
78M6631 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
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
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
Pin Descriptions................................................................................................................................ 26
Rev 2
2
3
4
2
DS_6631_056
4.1
4.2
4.3
5
6
7
78M6631 Data Sheet
Power and Ground Pins............................................................................................................. 26
Analog Pins................................................................................................................................ 26
Digital Pins ................................................................................................................................. 27
I/O Equivalent Circuits...................................................................................................................... 28
Ordering Information ........................................................................................................................ 29
Contact Information.......................................................................................................................... 29
Revision History........................................................................................................................................ 30
Rev 2
3
78M6631 Data Sheet
DS_6631_056
Figures
Figure 1: 78M6631 IC Functional Block Diagram ......................................................................................... 6
Figure 2: AFE Block Diagram ....................................................................................................................... 8
Figure 3: Functions Defined by V1.............................................................................................................. 11
Figure 4: SPI Slave Port: Typical Read and Write Operations ................................................................... 13
Figure 5: SPI Slave Port Timing.................................................................................................................. 22
Figure 6: Pinout for QFN-56 Package......................................................................................................... 23
Figure 7: PCB Land Pattern for QFN-56 Package...................................................................................... 25
Figure 8: I/O Equivalent Circuits ................................................................................................................. 28
Tables
Table 1: SPI Command Description............................................................................................................ 13
Table 2: Absolute Maximum Ratings .......................................................................................................... 15
Table 3: Recommended External Components .......................................................................................... 16
Table 4: Recommended Operating Conditions........................................................................................... 16
Table 5: Input Logic Levels ......................................................................................................................... 17
Table 6: Output Logic Levels ...................................................................................................................... 17
Table 7: Power-Fault Comparator Performance Specifications.................................................................. 17
Table 8: Power Supply Monitor Performance Specifications (BME= 1)...................................................... 18
Table 9: Supply Current Performance Specifications ................................................................................. 18
Table 10: Crystal Oscillator Performance Specifications............................................................................ 18
Table 11: Temperature Sensor Performance Specifications ...................................................................... 19
Table 12: VREF Performance Specifications.............................................................................................. 19
Table 13: ADC Converter Performance Specifications............................................................................... 20
Table 14: Flash Memory Timing Specifications .......................................................................................... 21
Table 15: EEPROM Interface Timing.......................................................................................................... 21
Table 16: RESET Timing ............................................................................................................................ 21
Table 17: SPI Slave Port Timing................................................................................................................. 22
Table 19: Power and Ground Pins.............................................................................................................. 26
Table 20: Analog Pins ................................................................................................................................. 26
Table 21: Digital Pins .................................................................................................................................. 27
Table 22: Ordering Information ................................................................................................................... 29
4
Rev 2
DS_6631_056
78M6631 Data Sheet
1 Hardware Functional Description
1.1
Hardware Overview
The Teridian 78M6631 single-chip power measurement and monitoring device integrates all the primary
AC measurement and control blocks required to implement the 3-phase power measurement and
monitoring system.
The 78M6631 includes:
Six input analog front-end (AFE) (3 Differential Current/3 Voltage)
Independent digital computation engine (CE)
8051-compatible microprocessor (MPU) which executes one instruction per clock cycle (80515)
Precision voltage reference
Temperature sensor
RAM and flash memory
A variety of I/O pins
Communication Interfaces: UART, SPI, and I
2
C (Master)
Various current sensor technologies are supported including Current Transformers (CT), Resistive
Shunts, and Rogowski coils.
The 32-bit compute engine (CE) of the 78M6631 sequentially process the samples from the analog inputs
on pins IA, IB, IC, VA, VB, and VC and performs calculations to measure active power (Watts), reactive
power (VARs), apparent power (VAs), power factor, fundamental power, and harmonic power for three
independent phases. RMS, fundamental, and harmonic currents and voltages are also computed for each
phase. Totals are available for most results.
Figure 1
provides a block diagram of the 78M6631 IC. A detailed description of the various functional
blocks follows.
Refer to the applicable Firmware Description Document for additional supported functionality.
Rev 2
5
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