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71M6543F/71M6543G Data Sheet
4.3
Systems Using 71M6xx3 Isolated Sensors and Current Shunts
Figure 31 shows a typical connection for current shunt sensors; using the 71M6xx3 (polyphase) isolated
sensors. Note that one shunt current sensor is connected without isolation, which is the neutral current
sensor in this example (connected to pins IADC0-IADC1). Each 71M6xx3 device is electrically isolated
by a low-cost pulse transformer. The 71M6543 current sensor inputs must be configured for remote
sensor communications, as described in 2.2.8 71M6xx3 Isolated Sensor Interface (page 22 ). Flexible
remapping using the I/O RAM registers MUXn_SEL[3:0] allows the sequence of analog input pins to be
different from the standard configuration (a corresponding CE code must be used). See Figure 2 for the
AFE configuration corresponding to Figure 31 .
C
NEUTRAL
Shunt Current Sensors
LOAD
B
A
POWER SUPPLY
NEUTRAL
Note: This system is referenced to Neutral
3x 71M6xx3
IADC1 } IN*
IADC7 } IC
IADC5 } IB
IADC3 } IA
71M6543G
TEMPERATURE
SENSOR
Pulse Transformers
MUX and ADC
IADC0
VADC10 (VC)
IADC6
VADC9 (VB)
IADC4
VADC8 (VA)
IADC2
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
WAKE-UP
71M6543F/ 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 = Neutral Current
9/17/2010
Figure 31: System Using Three-Remotes and One-Local (Neutral) Sensor
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