
78M6618
Octal Power and
Energy Measurement IC
Simplifying System Integration
TM
DATA SHEET
DS_6618_005
June 2010
Rev. 1.3
2010 Teridian Semiconductor Corporation
1
DESCRIPTION
The Teridian 78M6618 is a highly integrated IC for
independent monitoring and measurement of up to eight (8)
single-phase AC outlets. With multiple host interface options,
an integrated LCD driver, and configurable I/Os, it is ideal for
metered power distribution units (PDUs) and rack enclosures
for the data center as well as intelligent power strips and sub
panels in the grid-friendly digital home.
At the measurement interface, the device provides ten analog
inputs for interfacing to voltage and current sensors. Scaled
voltages from the sensors are fed to Teridian’s patented Single
Converter Technology
which 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.
The integrated MPU core and 128 KB of Flash memory
provides a flexible means of configuration, post-processing,
data formatting, interfacing to host processor via 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
pre-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.
80515
MPU
RTC
IA
IB
IC
ID
XIN
XOUT
OPT_RX
OPT_TX
V1
TX
RX
V3.3A V3.3D
VBAT
V2.5
IE
IF
GNDA GNDD
ICE
RELAY DRIVERS,
7-SEG LCD, etc.
(optional)
DC
POWER FAULT
EEPROM
(optional)
BATTERY
(optional)
COMPARATOR
OSC/PLL
CONVERTER
COMPUTE
ENGINE
FLASH
RAM
32 kHz
REGULATOR
AC to DC
POWER SUPPLY
TERIDIAN
78M6618
TEMP
SENSOR
VREF
IG
UARTs
I2C
SPI
Host uC,
additional 6618s
VA
IH
VB
LIVE
NEUTRAL
CT-1
CT-2
CT-3
CT-4
CT-5
CT-6
CT-7
CT-8
OUTLET1
OUTLET2
OUTLET3
OUTLET4
OUTLET5
OUTLET6
OUTLET7
OUTLET8
NEUTRAL
LIVE
+
-
TIMERS
DIO [1:19]
SEG [1:35]
Host uC,
additional 6618s
FEATURES
< 0.5% Wh accuracy over wide 2000:1 current
range and over temperature
Exceeds IEC 62053 / ANSI C12.20 standards
Voltage reference < 40 ppm/°C
Ten sensor inputs—V3P3 referenced
21-bit delta-sigma ADC with independent 32-bit
compute engine (CE)
8-bit MPU (80515), 1 clock cycle per instruction
with 4 KB MPU XRAM
128 KB Flash with security
Integrated ICE for MPU debug
32 kHz time base with hardware watchdog
timer
UART and high-speed slave SPI host interface
options
Up to 19 general purpose 5 V tolerant I/O pins
LCD driver (up to 70 pixels)
Packaged in a RoHS compliant (6/6) lead-free
68-pin QFN
Complete Application Firmware provides:
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
46-64 Hz line frequency range with same
calibration