71M6542F MAXIM [Maxim Integrated Products], 71M6542F Datasheet - Page 95

• Manufacturer Part Number: 71M6542F
• Description: 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs
• Manufacturer: MAXIM [Maxim Integrated Products]

4.5
Figure 38
current channel may be directly connected to either a shunt resistor or a CT, while the IBP-IBN channel is
connected to a CT and is therefore isolated. This configuration implements a dual-phase measurement
utilizing Equation 2. For best performance, both the IAP-IAN and IBP-IBN current sensor inputs are
configured for differential mode (i.e., DIFFA_E = 1 and DIFFB_E = 1, I/O RAM 0x210C[4] and 0x210C[5]).
The IBP-IBN input must be configured as an analog differential input disabling the remote sensor
interface (i.e., RMT_E = 0, I/O RAM 0x2709[3]). See
Figure
PHASE A
38.
71M6542F/G Using Local Sensors
shows a 71M6542F/G configuration using locally connected current sensors. The IAP-IAN
Shunt
NEUTRAL
HOST
AMR
PHASE B
IR
Shunt
Figure 37: 71M6542F/G with Local Sensors
CT or
NEUTRAL
IAP
IAN
SPI INTERFACE
SERIAL PORTS
MODUL-
POWER FAULT
PHASE A
IBP
IBN
COMPARATOR
VB
VA
MUX and ADC
ATOR
TX
RX
VREF
TX
RX
LOAD
LOAD
Figure 4
TEMPERATURE
V3P3A V3P3SYS
TERIDIAN
71M6542F
COMPUTE
MEMORY
ENGINE
SENSOR
TIMERS
FLASH
MPU
RAM
RTC
ICE
POWER SUPPLY
71M6541D/F/G and 71M6542F/G Data Sheet
for the AFE configuration corresponding to
Note:
This system is referenced to PHASE A
11/5/2010
GNDA GNDD
OSCILLATOR/
REGULATOR
DIO, PULSES
LCD DRIVER
VBAT_RTC
PWR MODE
CONTROL
BATTERY
MONITOR
WAKE-UP
COM0...5
SEG/DIO
PLL
VBAT
V3P3D
XOUT
SEG
DIO
XIN
BATTERY
RTC
BATTERY
8888.8888
LCD DISPLAY
32 kHz
I
2
EEPROM
PULSES,
C or µWire
DIO