Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
3
Application Information
3.1
Connection of Sensors
Figure 28 through Figure 30 show how resistive dividers, current transformers, Rogowski coils and resis-
tive shunts are connected to the voltage and current inputs of the 71M6531.
VA = Vin * Rout/(Rout + Rin)
VA
Rin
Vin
Rout
Figure 28: Resistive Voltage Divider
Iin
Iout
IIN
IOUT
IA
InP
VDIFF
VOUT
Vout
R
R
V3P3A
InN
V3P3
1/N
1/N
Filter
Figure 29: CT with Single Ended (Left) and Differential Input (Right) Connection
Vout = dIin /dt
Iin
Iin
1/N
IA
IA
R
Vout
Vout
R
VC
V3P3
V3P3
Figure 30: Resistive Shunt (Left) and Rogowski Sensor (Right) Connection
3.2
Connecting 5-V Devices
All digital input pins of the 71M6531D/F and 71M6532D/F are compatible with external 5-V devices. I/O
pins configured as inputs do not require current-limiting resistors when they are connected to external 5-V
devices.
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