71M6543F Datasheet, PDF (87/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

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
B
LOAD
A
POWER SUPPLY
NEUTRAL
Note: This system is referenced to Neutral
3x TERIDIAN
71M6xx3
Pulse Transformers
AMR
IR
HOST
MUX and ADC
IADC0
IADC1
}IN*
VADC10 (VC)
IADC6
IADC7
}IC
VADC9 (VB)
IADC4
IADC5
}IB
VADC8 (VA)
IADC2
IADC3
}IA
V3P3A V3P3SYS GNDA GNDD
TERIDIAN
PWR MODE
CONTROL
71M6543F/ _WAKE-UP
71M6543H/ _REGULATOR
71M6543G/
VBAT
71M6543GH _{VBAT_RTC}
TEMPERATURE ^BATTERY
SENSOR
MONITOR
VREF
SERIAL PORTS
TX
RX
MODUL- RX
ATOR _TX
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/
PLL _XIN
XOUT
*IN = Neutral Current
9/17/2010
BATTERY
RTC
BATTERY
LCD DISPLAY
8888.8888
PULSES,
DIO
I²C or µWire
EEPROM
32 kHz
Figure 31: System Using Three-Remotes and One-Local (Neutral) Sensor
v1.2
© 2008–2011 Teridian Semiconductor Corporation
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