71m6543h-igtr/f Maxim Integrated Products, Inc., 71m6543h-igtr/f Datasheet - Page 87

• Manufacturer Part Number: 71m6543h-igtr/f
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

4.4
Figure 32
sensing for anti-tamper purposes. The Neutral current sensing CT can be omitted if Neutral current
sensing is not required. The system is referenced to Neutral (i.e., the Neutral rail is tied to V3P3A and
V3P3SYS).
v1.0
NEUTRAL
A
B
C
System Using Current Transformers
shows a polyphase system using four current transformers to support optional Neutral current
Current Transformers
HOST
AMR
IR
© 2008–2011 Teridian Semiconductor Corporation
Figure 32. System Using Current Transformers
*IN = Optional Neutral Current
NEUTRAL
SPI INTERFACE
VADC8 (VA)
VADC10 (VC)
SERIAL PORTS
IADC2
IADC3
VADC9 (VB)
MODUL-
POWER FAULT
COMPARATOR
IADC4
IADC5
IADC6
IADC7
IADC1
IADC0
MUX and ADC
ATOR
TX
RX
VREF
}
}
}
}
IA
IB
IN*
IC
TX
Note: This system is referenced to Neutral
RX
TEMPERATURE
V3P3A V3P3SYS
71M6543F/
71M6543H
TERIDIAN
COMPUTE
MEMORY
SENSOR
ENGINE
TIMERS
FLASH
MPU
RAM
RTC
ICE
POWER SUPPLY
LOAD
GNDA GNDD
OSCILLATOR/
REGULATOR
DIO, PULSES
LCD DRIVER
VBAT_RTC
PWR MODE
CONTROL
BATTERY
MONITOR
WAKE-UP
COM0...5
SEG/DIO
PLL
VBAT
9/17/2010
V3P3D
XOUT
SEG
DIO
XIN
71M6543F/H Data Sheet
BATTERY
RTC
BATTERY
8888.8888
LCD DISPLAY
32 kHz
I
2
EEPROM
PULSES,
C or µWire
DIO
87