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78M6631

3-Phase Power Measurement IC

Maxim Integrated 

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.

19-6039; Rev 1; 1/12

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

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