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71M6545/71M6545H Data Sheet
4.3
Systems Using 71M6xx3 Isolated Sensors and Current Shunts
Figure 27 shows a typical connection for current shunt sensors; using the 71M6xx3 (poly-phase) 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 71M6545/H current sensor inputs must be configured for remote
sensor communications, as described in 2.2.8 . 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
27 .
C
Shunt Resistor Sensors
NEUTRAL
B
A
LOAD
POWER SUPPLY
This system is referenced to Neutral
NEUTRAL
} IN*
IADC7 } IC
} IB
} IA
71M6545/H
TEMPERATURE
SENSOR
Pulse Transformers
B
A
C
MUX and ADC
IADC0
IADC1
VADC10 (VC)
IADC6
VADC9 (VB)
IADC4
IADC5
VADC8 (VA)
IADC2
IADC3
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
PB
REGULATOR
VBAT_RTC
BATTERY
MONITOR
RTC
BATTERY
VREF
SERIAL PORT
RX
TX
FLASH
MEMORY
ICE
RAM
MPU
RTC
TIMERS
OSCILLATOR/
PLL XIN
XOUT
DIO, PULSES,
LEDs
DIO
V3P3D
24
32 kHz
DIO
I 2 C or μWire
EEPROM
HOST
SPI_CKI
SPI_DI
SPI_DO
SPI_CSZ
XFER_BUSY
SPI INTERFACE
T
M COMPUTE
U ENGINE
X
WPULSE
XPULSE
RPULSE
YPULSE
10/7/2010
PULSES
3.3 VDC
SAG
*IN = Optional Neutral Current
Figure 27: System Using Three-Remotes and One-Local (Neutral) Sensor
72
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