71M6543F/H and 71M6543G/GH 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
MUX and ADC
V3P3A V3P3SYS
GNDA GNDD
IADC2
IADC3
}IA
PWR MODE
CONTROL
TERIDIAN
71M6543F/
71M6543H/
71M6543G/
71M6543GH
VADC8 (VA)
IADC4
IADC5
WAKE-UP
}
IB
REGULATOR
VADC9 (VB)
IADC6
BATTERY
}IC
VBAT
IADC7
VBAT_RTC
VADC10 (VC)
IADC0
RTC
BATTERY
BATTERY
MONITOR
TEMPERATURE
SENSOR
}IN*
IADC1
VREF
RAM
COM0...5
SEG
LCD DISPLAY
SERIAL PORTS
COMPUTE
ENGINE
8888.8888
TX
RX
SEG/DIO
AMR
IR
LCD DRIVER
DIO, PULSES
FLASH
MEMORY
PULSES,
DIO
DIO
MODUL-
RX
ATOR
TX
I2C or µWire
EEPROM
POWER FAULT
COMPARATOR
MPU
RTC
V3P3D
OSCILLATOR/
PLL
TIMERS
XIN
SPI INTERFACE
32 kHz
HOST
ICE
XOUT
9/17/2010
*IN = Optional Neutral Current
Figure 32. System Using Current Transformers
88
© 2008–2011 Teridian Semiconductor Corporation
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