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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
Pin Description (continued)
PIN
11
12
13, 27
14
15, 18, 21,
24
16, 19, 22,
25
17, 20, 23,
26
28
29
30
31
32
—
NAME
V EE
V DD
N.C.
AGND
SENSE4,
SENSE3,
SENSE2,
SENSE1
GATE4,
GATE3,
GATE2,
GATE1
OUT4,
OUT3,
OUT2,
OUT1
SVEE1
EN_CL5
AUTO
MIDSPAN
INT
EP
FUNCTION
Analog Low-Side Supply Input. Bypass with an external 100V, 0.1 F F ceramic capacitor between
AGND and V EE .
Digital High-Side Supply Output. Bypass with an external RC network; see the V DD Power Supply
section for details.
No Connection. Not internally connected. Leave N.C. unconnected.
Analog High-Side Supply Input
Current-Sense Positive Terminal Inputs. Connect to the source of the external power MOSFET and
connect a 0.25 I current-sense resistor between SENSE_ and SVEE _ . Use Kelvin-sensing technique in
PCB layout for best accuracy current sensing.
Port_ MOSFET Gate Drivers. Connect GATE_ to the gate of the external power MOSFET (see the
Typical Operating Circuit ).
Port Output Voltage Senses. Connect OUT_ to the port output.
Port 1/2 Current-Sense Negative Terminal Input. Use Kelvin sensing technique in PCB layout for best
accuracy current sensing.
Class 5 Enable Input. Referenced to DGND. EN_CL5 is internally pulled down to DGND. Leave
unconnected to disable the classification for Class 5 devices (IEEE 802.3at-compliant mode). Connect
EN_CL5 to V DD to enable the classification of Class 5 devices. EN_CL5 is latched in after the device
is powered up or after a reset condition.
Auto/Shutdown Mode Input. Referenced to DGND. AUTO is internally pulled up to V DD . Leave
unconnected to put the device into auto mode by default. Connect AUTO to DGND instead to set the
default mode to shutdown. In either configuration, the software can change the operating mode of the
device. AUTO is latched in after the device is powered up or after a reset condition.
Detection Collision Avoidance Logic Input. Referenced to DGND. MIDSPAN is internally pulled up
to V DD . Leave unconnected to activate midspan mode, or connect to DGND to disable this function.
MIDSPAN is latched in after the device is powered up or after a reset condition.
Open-Drain Interrupt Output. Referenced to DGND. INT is pulled low whenever an interrupt is sent to
the microcontroller. See the Interrupt section for details. Connect to DGND if the I 2 C interface is not
used.
Exposed Pad. EP is internally connected to V EE . Connect EP to V EE externally.
13
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