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53
KX-NT321RU
13.1.4. IC9 (PoE Interface Controller)
Pin No.
Terminal Name
I/O Setting
Contents of Control
Remark
1
NC
-
No Internal Connection
2
R class
I
Class Select Input
3
NC
-
No Internal Connection
4
Vin
I
Power Input. Tie to system -48V through the input diode
bridge.
bridge.
5
Vout
O
Power Output. Supplies -48V to the PD load through an
internal power MOSFET that limits input current.VOUT is
high impedance until the input voltage rises above the turn-
on UVLO threshold. The output is then current limited. See
Applications Information.
internal power MOSFET that limits input current.VOUT is
high impedance until the input voltage rises above the turn-
on UVLO threshold. The output is then current limited. See
Applications Information.
6
PWRGD
O
Power Good Output, Open-Drain.Signals to the PD load that
the LTC4257-1 MOSFET is on and that the PD.s DC/DC
converter can start operation. Low impedance indicates
power is good. PWRGD is high impedance during detection,
classification and in the event of a thermal overload.
PWRGD is referenced to VIN.
the LTC4257-1 MOSFET is on and that the PD.s DC/DC
converter can start operation. Low impedance indicates
power is good. PWRGD is high impedance during detection,
classification and in the event of a thermal overload.
PWRGD is referenced to VIN.
7
NC
-
No Internal Connection.
8
GND
-
Digital GND
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