78M6618 Data Sheet DS_6618_005
4 Rev. 1.4
Figures
Figure 1: 78M6618 IC Functional Block Diagram ......................................................................................... 6
Figure 2: AFE Block Diagram ....................................................................................................................... 8
Figure 3: SPI Slave Port: Typical Read and Write Operations ................................................................... 12
Figure 4: SPI Slave Port (MISSION Mode) Timing ..................................................................................... 23
Figure 5: Pinout for QFN-68 Package ......................................................................................................... 24
Figure 6: QFN-68 Package Outline (Top, Bottom, and Side View) ............................................................ 25
Figure 7: PCB Land Pattern for QFN 68 Package ...................................................................................... 26
Figure 8: I/O Equivalent Circuits ................................................................................................................. 29
Tables
Table 1: SPI Command Description ............................................................................................................ 12
Table 2: Absolute Maximum Ratings .......................................................................................................... 14
Table 3: Recommended External Components .......................................................................................... 15
Table 4: Recommended Operating Conditions ........................................................................................... 15
Table 5: Input Logic Levels ......................................................................................................................... 16
Table 6: Output Logic Levels ...................................................................................................................... 16
Table 7: Power-Fault Comparator Performance Specifications .................................................................. 16
Table 8: Battery Monitor Performance Specifications (BME= 1) ................................................................. 17
Table 9: Supply Current Performance Specifications ................................................................................. 17
Table 10: V3P3D Switch Performance Specifications ................................................................................ 17
Table 11: 2.5 V Voltage Regulator Performance Specifications ................................................................. 18
Table 12: Low-Power Voltage Regulator Performance Specifications ....................................................... 18
Table 13: Crystal Oscillator Performance Specifications ............................................................................ 18
Table 14: LCD DAC Performance Specifications ....................................................................................... 18
Table 15: LCD Driver Performance Specifications ..................................................................................... 19
Table 16: Optical Interface Performance Specifications ............................................................................. 19
Table 17: Temperature Sensor Performance Specifications ...................................................................... 19
Table 18: VREF Performance Specifications .............................................................................................. 20
Table 19: ADC Converter Performance Specifications ............................................................................... 21
Table 20: Flash Memory Timing Specifications .......................................................................................... 22
Table 21: EEPROM Interface Timing .......................................................................................................... 22
Table 22: RESET Timing ............................................................................................................................ 22
Table 23: RTC Range ................................................................................................................................. 22
Table 24: SPI Slave Port (MISSION Mode) Timing .................................................................................... 23
Table 25: Recommended PCB Land Pattern Dimensions .......................................................................... 26
Table 26: Power and Ground Pins .............................................................................................................. 27
Table 27: Analog Pins ................................................................................................................................. 27
Table 28: Digital Pins .................................................................................................................................. 28
Table 29: Ordering Information ................................................................................................................... 30
DS_6618_005 78M6618 Data Sheet
Rev. 1.4 5
1 Hardware Functional Description
1.1 Hardware Overview
The Teridian 78M6618 single-chip measurement and monitoring IC integrates all the primary AC
measurement and control blocks required to implement an 8-outlet single-phase PDU with per outlet
metering and intelligent relay control The 78M6618 includes:
A ten-input analog front end (AFE)
An independent digital computation engine (CE)
An 8051-compatible microprocessor (MPU) which executes one instruction per clock cycle (80515)
A precision voltage reference
A temperature sensor
RAM and Flash memory
A variety of I/O pins
LCD drivers
Various current sensor technologies are supported including Current Transformers (CT), Resistive Shunts
and Rogowski coils.
In a sub-metering application, the 32-bit compute engine (CE) of the 78M6618 sequentially process the
samples from the analog inputs on pins IA, IB, IC, ID, IE, IF, IG, IH, VA, VB and performs calculations to
measure active energy (Wh) and reactive energy (VARh), as well as A
2
h and V
2
h for four-quadrant
measurement. These measurements are then accessed by the MPU, processed further, and output via
the peripheral devices available to the MPU.
In addition to the temperature-trimmed ultra-precision voltage reference, the on-chip digital temperature
compensation mechanism includes a temperature sensor and associated controls for correction of
undesirable temperature effects on measurement accuracy. Temperature-dependent external
components such as a crystal oscillator and current sensors can be characterized and their correction
factors can be programmed to produce measurements with exceptional accuracy over the industrial
temperature range.
A block diagram of the 78M6618 IC is shown in Figure 1. A detailed description of the various functional
blocks follows.
78M6618 Data Sheet DS_6618_005
6 Rev. 1.4
∆Σ ADC
CONVERTER
VREF
MUXP
XIN
XOUT
VREF
RESET
V1
UART
TX
RX
COM1, 0
LCD DISPLAY
DRIVER
DIGITAL I/O
POWER FAULT
GNDD
V3P3A
V3P3D
VBAT
VOLT
REG
2.5V to logic
V2P5
TMUXOUT
FAULTZ
GNDA
VBIAS
TEMP
OSC
(32.768kHz)
MCK
PLL
VREF
TEST
TEST
MODE
E_RXTX
RTC
VBIAS
ICE_E
V3P3SYS
TEST
MUX
VBAT
CE_PROG
CK_CE
CK_MPU
80MHz
VADC
CE
MULTI-
PURPOSE
IO
RTM
RPULSE
WPULSE
COM0, COM1
SEG0...
DIO_4...
to TMUX
SPI SLAVE
EEPROM I/F
FLASH
128KB
XRAM
4kB
CE_DATA
PCSZ
PCLK
PSDI
PSDO
SDATA
SCLK
SFR
80515
MPU
EMULATOR
E_TCLK
E_RSTZ
SEG7
SEG8
SEG9 / E_RXTX
SEG10 / E_TCLK
SEG11 / E_RST
SEG12
SEG14
SEG16
SEG15
SEG17
DIO4 / SEG24
DIO5 / SEG25
DIO6 / SEG26
DIO7 / SEG27
DIO10 / SEG30
RPULSE
WPULSE
XRAM BUS
8
16
32
CKTEST
ICE_E
CKTESTI
SEG0
SEG1
SEG2
SEG3 / PCLK
SEG4 / PSDO
SEG5 / PCSZ
SEG6 / PSDI
FIR
IH
VA
VB
IG
XPULSE
YPULSE
XPULSE
YPULSE
DIO8 / SEG28
DIO9 / SEG29
SEG18
SEG19
DIO43 / SEG63
DIO18 / SEG38
DIO17 / SEG37
DIO13 / SEG33
DIO14 / SEG34
DIO15 / SEG35
DIO16 / SEG36
ID
IE
IF
IC
IA
IB
OPT_RX /
DIO1
OPT_TX /
DIO2
OPTICAL
MOD
DIO3
DIO11 / SEG31
DIO19 / SEG39
Figure 1: 78M6618 IC Functional Block Diagram

78M6618-MR/F/P2

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
IC PWR MEASUREMENT OCTAL 68QFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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