19-5346; Rev 3/11
A Maxim Integrated Products Brand
78M6618
Octal Power and
Energy Measurement IC
DATA SHEET
March 2011
DS_6618_005
DESCRIPTION
The Teridian 78M6618 is a highly integrated IC for
independent monitoring and measurement of up to eight
single-phase AC outlets. With multiple host interface options,
an integrated LCD driver, and configurable I/Os, the device is
ideal for metered power distribution units (PDUs) and rack
enclosures for the data center, as well as intelligent power
strips and subpanels in the grid-friendly digital home.
At the measurement interface, the device provides 10 analog
inputs for interfacing to voltage and current sensors. Scaled
voltages from the sensors are fed to our Single Converter
Technology
®
that uses a 21-bit delta-sigma ADC, independent
32-bit compute engine (CE), digital temperature compensation,
and precision voltage references to provide better than 0.5%
accuracy over a wide 2000:1 dynamic range.
FEATURES
< 0.5% Wh Accuracy Over Wide 2000:1
Current Range and Over Temperature
Exceeds IEC 62053/ANSI C12.20 Standards
Voltage Reference < 40ppm/°C
10 Sensor Inputs—V3P3 Referenced
21-Bit Delta-Sigma ADC with Independent
32-Bit Compute Engine (CE)
8-Bit MPU (80515), One Clock Cycle per
Instruction with 4KB MPU XRAM
128KB Flash with Security
Integrated ICE for MPU Debug
32kHz Time Base with Hardware Watchdog
Timer
UART and
High-Speed Slave SPI Host Interface
Options
Up to 19 General-Purpose 5V Tolerant I/O Pins
LCD Driver (Up to 70 Pixels)
The integrated MPU core and 128KB of flash memory provides
a flexible means of configuration, postprocessing, data
formatting, interfacing to host processor through a UART or
SPI™ interface, displaying output data to an LCD, or using
DIO pins for intelligent relay control. Complete firmware for
common applications is available from Teridian and can be
loaded into the IC during manufacturing test. Alternatively, a
Packaged in a Lead(Pb)-Free/RoHS-Compliant
(6/6) 68-Pin QFN
complete array of ICE, development tools, and programming
libraries are available to allow customization MPU code for
Robust Sub-Metering Application Firmware:
each application.
o
True RMS Calculations for Current, Voltage,
Line Frequency, Real Power, Reactive
Power, Apparent Power, and Power Factor
o
Accumulated Watt-Hours, Kilowatt-Hours,
and Cost
o
Intelligent Switch Control at Zero Crossings
o
Digital Temperature Compensation
o
Phase Compensation (15)
o
Quick Calibration Routines
o
46-64Hz Line Frequency Range with Same
Calibration
o
Programmable Alarm Thresholds
o
High-Level UART Communication Protocols
o
High-Level SPI Communication Protocols
Single Converter Technology is a registered trademark of
Maxim Integrated Products, Inc.
SPI is a trademark of Motorola, Inc.
Rev. 1.4
© 2011 Teridian Semiconductor Corporation
1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
