Rev 2, 4/16
78M6618
Octal Power and
Energy Measurement IC
DATA SHEET
APRIL 2016
DESCRIPTION
FEATURES
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.
< 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)
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.
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
The integrated MPU core and 128KB of flash memory provides
a flexible means of configuration, post-processing, 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 complete array
of ICE, development tools, and programming libraries are
available to allow customization MPU code for each application.
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)
Packaged in a Lead(Pb)-Free/RoHS-Compliant
(6/6) 68-Pin QFN
Robust Sub-Metering Application Firmware:
o
True RMS Calculations for Current,
Voltage, Line Frequency, Real Power,
Reactive Power, Apparent Power, and
Power Factor
LIVE
CT-1
CT-2
CT-3
CT-4
CT-5
CT-6
CT-7
CT-8
OUTLET1
OUTLET2
OUTLET3
OUTLET4
OUTLET5
OUTLET6
OUTLET7
OUTLET8
o
o
Accumulated Watt-Hours, Kilowatt-Hours,
and Cost
AC to DC
LIVE
POWER SUPPLY
Intelligent Switch Control at Zero
Crossings
-
+
NEUTRAL
NEUTRAL
CONVERTER
IA
V3.3A V3.3D GNDA GNDD
o
o
o
o
Digital Temperature Compensation
Phase Compensation (15)
Quick Calibration Routines
46-64Hz Line Frequency Range with
Same Calibration
REGULATOR
IB
IC
ID
IE
IF
BATTERY
(optional)
VBAT
TERIDIAN
78M6618
V2.5
UARTs
TX
Host uC,
additional 6618s
RX
IG
IH
OPT_TX
OPT_RX
TEMP
SENSOR
I2C
RAM
EEPROM
(optional)
VA
VB
o
o
Programmable Alarm Thresholds
COMPUTE
ENGINE
SPI
TIMERS
RTC
Host uC,
additional 6618s
High-Level UART Communication
Protocols
VREF
COMPARATOR
FLASH
DC
V1
POWER FAULT
o
High-Level SPI Communication Protocols
80515
MPU
RELAY DRIVERS,
7-SEG LCD, etc.
(optional)
OSC/PLL
DIO [1:19]
SEG [1:35]
XIN
32 kHz
XOUT
ICE
Single Converter Technology is a registered trademark of
Silergy Corp
SPI is a trademark of Motorola, Inc.
Rev. 2
© 2016 Silergy Corp
1
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