71M6543F/H and 71M6543G/GH 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.
Shunt Current Sensors
C
NEUTRAL
LOAD
B
A
POWER SUPPLY
NEUTRAL
Note: This system is referenced to Neutral
3x TERIDIAN
71M6xx3
MUX and ADC
V3P3A V3P3SYS
GNDA GNDD
Pulse Transformers
IADC0
IADC1
}IN*
PWR MODE
CONTROL
TERIDIAN
71M6543F/
71M6543H/
71M6543G/
71M6543GH
VADC10 (VC)
IADC6
}IC
WAKE-UP
IADC7
REGULATOR
VADC9 (VB)
IADC4
BATTERY
}IB
VBAT
IADC5
VBAT_RTC
VADC8 (VA)
IADC2
RTC
BATTERY
BATTERY
MONITOR
TEMPERATURE
SENSOR
}IA
IADC3
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
*IN = Neutral Current
9/17/2010
Figure 31: System Using Three-Remotes and One-Local (Neutral) Sensor
v1.2
© 2008–2011 Teridian Semiconductor Corporation
87
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
