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| 71M6545 Datasheet, PDF (73/134 Pages) Maxim Integrated Products – Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size | |||
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PDS_6545_009
Data Sheet 71M6545/H
4.4 System Using Current Transformers
Figure 28 shows a poly-phase system using four current transformers to support optional Neutral current
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).
Current Transformers
PHASE A
NEUTRAL
PHASE B
PHASE C
LOAD
HOST
This system is referenced to Neutral
NEUTRAL
POWER SUPPLY
SPI_CKI
SPI_DI
SPI_DO
SPI_CSZ
XFER_BUSY
SAG
MUX and ADC
IADC0
IADC1
} IA
VADC8 (VA)
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
IADC2
IADC3
}
IB
VADC9 (VB)
IADC4
IADC5
}
IC
VADC10 (VC)
IADC6
IADC7
}
*IN
TERIDIAN
PB
71M6545/H REGULATOR
TEMPERATURE
SENSOR
VBAT_RTC
BATTERY
MONITOR
VREF
SERIAL PORT
RX
TX
FLASH
MEMORY
RAM
MPU
RTC
TIMERS
OSCILLATOR/
PLL XIN
XOUT
DIO, PULSES,
LEDs
DIO
ICE
T
SPI INTERFACE
M
U
COMPUTE
ENGINE
X
V3P3D
WPULSE
XPULSE
RPULSE
YPULSE
10/7/2010
RTC
BATTERY
32 kHz
24
DIO
I2C or µWire
EEPROM
PULSES 3.3 VDC
*IN = Optional Neutral Current
Figure 28. System Using Current Transformers
v1.0
© 2008â2011 Teridian Semiconductor Corporation
73
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