71M6541D Datasheet, PDF (96/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
4.6 71M6542F/G Using 71M6x01 and Current Shunts
Figure 38 shows a typical two-phase connection for the 71M6542F/G using one isolated and one non-
isolated sensor. For best performance, the IAP-IAN current sensor input is configured for differential mode
(i.e., DIFFA_E = 1, I/O RAM 0x210C[4]). The 71M6x01 Isolated Sensor Interface is used to isolate phase B.
The outputs of the 71M6x01 Isolated Sensor Interface are routed through a pulse transformer, which is
connected to the pins IBP-IBN. The IBP-IBN pins must be configured for remote sensor communication
(i.e., RMT_E =1, I/O RAM 0x2709[3]). See Figure 5 for the AFE configuration corresponding to Figure 38.
PHASE A
Shunt
NEUTRAL
Shunt
PHASE B
LOAD
LOAD
Note:
This system is referenced to PHASE A
NEUTRAL
PHASE A
POWER SUPPLY
TERIDIAN
71M6XX1
Pulse
Trans-
former
AMR
IR
HOST
MUX and ADC V3P3A V3P3SYS _{GNDA GNDD}
IAP
PWR MODE
IAN
CONTROL
TERIDIAN ^WAKE-UP
71M6542F ^REGULATOR
VB
VBAT
VA
VBAT_RTC
IBP
TEMPERATURE ^BATTERY
IBN
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
BATTERY
RTC
BATTERY
LCD DISPLAY
8888.8888
PULSES,
DIO
I²C or µWire
EEPROM
32 kHz
Figure 38: 71M6542F/G with 71M6x01 Isolated Sensor