71M6545 MAXIM [Maxim Integrated Products], 71M6545 Datasheet - Page 72

• Manufacturer Part Number: 71M6545
• Description: Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size
• Manufacturer: MAXIM [Maxim Integrated Products]

Data Sheet 71M6545/H
4.3
Figure 27
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
27.
72
Systems Using 71M6xx3 Isolated Sensors and Current Shunts
shows a typical connection for current shunt sensors; using the 71M6xx3 (poly-phase) isolated
NEUTRAL
HOST
Figure 27: System Using Three-Remotes and One-Local (Neutral) Sensor
C
B
A
Shunt Resistor Sensors
Pulse Transformers
© 2008–2011 Teridian Semiconductor Corporation
XFER_BUSY
SPI_CKI
SPI_DI
SPI_DO
SPI_CSZ
A
SAG
B
C
This system is referenced to Neutral
NEUTRAL
VADC9 (VB)
IADC4
IADC5
VADC8 (VA)
IADC6
IADC7
IADC2
IADC3
SPI INTERFACE
IADC0
IADC1
VADC10 (VC)
*IN = Optional Neutral Current
RX
TX
MUX and ADC
SERIAL PORT
MEMORY
FLASH
VREF
ICE
Figure 2
}
}
}
}
IB
IN*
IC
IA
LOAD
TEMPERATURE
M
71M6545/H
U
X
V3P3A V3P3SYS
T
TERIDIAN
for the AFE configuration corresponding to
SENSOR
TIMERS
POWER SUPPLY
COMPUTE
MPU
RAM
RTC
ENGINE
GNDA GNDD
OSCILLATOR/
DIO, PULSES,
REGULATOR
PWR MODE
CONTROL
BATTERY
MONITOR
VBAT_RTC
LEDs
PLL
WPULSE
RPULSE
XPULSE
YPULSE
10/7/2010
V3P3D
XOUT
DIO
PB
XIN
24
PULSES
I
2
EEPROM
C or µWire
RTC
BATTERY
DIO
32 kHz
PDS_6545_009
3.3 VDC
Figure
v1.0