19-6039; Rev 2; 4/12
78M6631
3-Phase Power-
Measurement IC
DATA SHEET
DS_6631_056
DESCRIPTION
FEATURES
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.
< 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)
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.
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
The integrated MPU core and 128 KB of flash memory
provide
a
flexible means of configuration, post-
UART, I2C, and High-Speed Slave SPI Host
Interface Options
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.
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):
oTrue RMS Current and Voltage Calculations
oActive, Reactive, Apparent, Fundamental,
and Harmonic Power Calculations
oFundamental and Harmonic Current and
Voltage Calculations
oLine Frequency and Power Factor
Calculations
oPhase Compensation (18 at 60 Hz)
oBuilt-In Calibration Routines
oProgrammable Alarm Thresholds
oCommand Line (UART) Communications
oHigh-Speed SPI Communications
Teridian is a trademark and Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc.
Rev 2
1