71M6541F Maxim, 71M6541F Datasheet - Page 93

• Manufacturer Part Number: 71M6541F
• Description: The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are Teridian™ 4th-generation single-phase metering SoCs with a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver
• Manufacturer: Maxim

4.3
Figure 35
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 single-phase measurement
with tamper-detection using one current sensor to measure the neutral current. This configuration can
also be used to create a split phase meter (e.g., ANSI Form 2S). 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
configuration corresponding to
Rev 2
NEUTRAL
71M6541D/F/G Using Local Sensors
LINE
shows a 71M6541D/F/G configuration using locally connected current sensors. The IAP-IAN
CT
HOST
AMR
IR
Figure 35. 71M6541D/F/G with Local Sensors
Shunt
Figure
CT
or
NEUTRAL
35.
IAN
IBP
IBN
SPI INTERFACE
IAP
SERIAL PORTS
MODUL-
POWER FAULT
VA
COMPARATOR
LINE
MUX and ADC
ATOR
TX
RX
VREF
TX
RX
LOAD
TEMPERATURE
V3P3A V3P3SYS
71M6541D/F
TERIDIAN
COMPUTE
MEMORY
ENGINE
SENSOR
TIMERS
FLASH
MPU
RAM
RTC
ICE
POWER SUPPLY
Note:
This system is referenced to LINE
71M6541D/F/G and 71M6542F/G Data Sheet
GNDA GNDD
OSCILLATOR/
REGULATOR
DIO, PULSES
11/5/2010
LCD DRIVER
VBAT_RTC
PWR MODE
CONTROL
BATTERY
MONITOR
WAKE-UP
COM0...5
SEG/DIO
PLL
VBAT
V3P3D
XOUT
SEG
DIO
XIN
Figure 2
BATTERY
RTC
BATTERY
8888.8888
LCD DISPLAY
32 kHz
I
2
EEPROM
PULSES,
C or µWire
for the AFE
DIO
93