71m6545h-igtr/f Maxim Integrated Products, Inc., 71m6545h-igtr/f Datasheet - Page 73

• Manufacturer Part Number: 71m6545h-igtr/f
• Description: Metrology Processors
• Manufacturer: Maxim Integrated Products, Inc.

PDS_6545_009
4.4
Figure 28
sensing for anti-tamper purposes. The Neutral current sensing CT can be omitted if Neutral current
sensing is not required. The system is referenced to Neutral (i.e., the Neutral rail is tied to V3P3A and
V3P3SYS).
v1.0
PHASE A
NEUTRAL
PHASE B
PHASE C
HOST
System Using Current Transformers
shows a poly-phase system using four current transformers to support optional Neutral current
Current Transformers
XFER_BUSY
© 2008–2011 Teridian Semiconductor Corporation
Figure 28. System Using Current Transformers
SPI_CKI
SPI_DI
SPI_DO
SPI_CSZ
SAG
This system is referenced to Neutral
NEUTRAL
VADC8 (VA)
VADC9 (VB)
SPI INTERFACE
IADC0
IADC1
IADC2
IADC3
IADC4
IADC5
VADC10 (VC)
IADC6
IADC7
RX
TX
MUX and ADC
SERIAL PORT
*IN = Optional Neutral Current
MEMORY
FLASH
VREF
ICE
}
}
}
}
IA
IB
IC
*IN
TEMPERATURE
M
71M6545/H
U
X
V3P3A V3P3SYS
T
TERIDIAN
SENSOR
TIMERS
POWER SUPPLY
COMPUTE
MPU
RAM
RTC
ENGINE
LOAD
GNDA GNDD
OSCILLATOR/
DIO, PULSES,
REGULATOR
PWR MODE
CONTROL
BATTERY
MONITOR
VBAT_RTC
LEDs
PLL
WPULSE
RPULSE
XPULSE
YPULSE
10/7/2010
V3P3D
XOUT
Data Sheet 71M6545/H
DIO
PB
XIN
24
PULSES
I
2
EEPROM
C or µWire
RTC
BATTERY
DIO
32 kHz
3.3 VDC
73