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71M6543F/71M6543G Data Sheet
4.4
System Using Current Transformers
Figure 32 shows a polyphase system using four current transformers to support optional Neutral current
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).
Current Transformers
A
NEUTRAL
LOAD
B
C
Note: This system is referenced to Neutral
POWER SUPPLY
NEUTRAL
} IA
MUX and ADC
IADC2
IADC3
VADC8 (VA)
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
IADC4 } IB
} IC
} IN*
IADC5
VADC9 (VB)
IADC6
IADC7
VADC10 (VC)
IADC0
IADC1
71M6543F/
71M6543G
TEMPERATURE
SENSOR
WAKE-UP
REGULATOR
VBAT
VBAT_RTC
BATTERY
MONITOR
BATTERY
RTC
BATTERY
TX
PLL
AMR
IR
HOST
VREF
SERIAL PORTS
TX
RX
MODUL- RX
ATOR
POWER FAULT
COMPARATOR
SPI INTERFACE
RAM
COMPUTE
ENGINE
FLASH
MEMORY
MPU
RTC
TIMERS
ICE
COM0...5
SEG
SEG/DIO
LCD DRIVER
DIO, PULSES
DIO
V3P3D
OSCILLATOR/
XIN
XOUT
LCD DISPLAY
8888.8888
PULSES,
DIO
I 2 C or μWire
EEPROM
32 kHz
*IN = Optional Neutral Current
9/17/2010
Figure 32. System Using Current Transformers
v2
87
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