78M6631 Datasheet PDF - Maxim Integrated Products
Part Number | 78M6631 | |
Description | 3-Phase Power-Measurement IC | |
Manufacturers | Maxim Integrated Products | |
Logo | ||
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19-6039; Rev 1; 1/12
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.
78M6631
3-Phase Power-
Measurement IC
DATA SHEET
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, I2C, 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 1
1
Datasheet pdf - http://www.DataSheet4U.net/
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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 I2C (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 1
5
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