PDS_6xxx_010
71M6xxx Data Sheet
Shunt Current Sensors
C
NEUTRAL
B
LOAD
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
VADC10 (VC)
IADC6
TERIDIAN
71M6543F/
71M6543H
}IC
WAKE-UP
IADC7
REGULATOR
VADC9 (VB)
IADC4
BATTERY
}
IB
VBAT
IADC5
VBAT_RTC
VADC8 (VA)
IADC2
IADC3
RTC
BATTERY
BATTERY
MONITOR
TEMPERATURE
SENSOR
}
IA
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 4: Current Sensors Connected to the 71M6543F/H or 71M6545/H with Three 71M6xx3
3.4
PCB Layout Considerations
To limit emissions and susceptibility to electromagnetic and magnetic fields, the signal wiring between the
shunt resistors and the 71M6xxx should be as short as possible and should consist of tightly twisted pair
cable. Similarly, the PCB traces between the 71M6xxx and the 71M654x should be routed as short as
possible and should be surrounded by grounded copper structures. The trace pairs should be routed as
close to each other as permitted by the PCB manufacturer.
The copper separation (gap) between the shunt side and the 71M654x side of the signal transformer
should be as wide as permitted by the footprint of the transformer, as shown in Figure 5.
v1.2
© 2008–2011 Teridian Semiconductor Corporation
9
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