PD69012 Datasheet, PDF (16/18 Pages) Microsemi Corporation – 12 Ports Power Over Ethernet Manager

PD69012 - 12 Ports Power Over Ethernet Manager
Application Information _______________________________________
The PD69012 can be integrated into a number of applications such as daughter boards, Ethernet switches or
routers. Examples of such applications are described below:
Integrated directly into a switch: Facilitates entire PoE concept by including the IC(s) on the main switch’s PCB.
Daughter board add-on: The IC is integrated into a small PCB dedicated for PoE, mounted on top of the switch’s
main PCB or in the DIMM module
Integrated into an RJ45 connector: Saves space on the main board and creates small differences between the PoE
and non-PoE versions of a switch
Midspans: Stand alone devices, installed between the Ethernet switch and PDs (Powered Devices) such as
telephones, cameras, wireless LANs, etc.
These Midspans include the PD69012 IC as a PoE control element, destined to inject power over the
communication lines.
Figure 4 and Figure 5 illustrate an example of basic applications of the PD69012 in an AC Disconnect Mode and
the DC Disconnect Mode:
Vmain :44÷ 57 v
Vp eri 3.3v
Ext_ Reg
CP_ OUT
Vport_ Pos
Vport_ Neg
FET_ gate
Vport_ Sense
CP_IN
VCC2P5
ADC2P5
R1
ASIC_ INI
R2
R3
I2 C_ INI
R4
I²C Co mmunication Bus
Vp eri 3.3 v
Add if line
is not in use
Reset
Disable_ Ports_ N
Interupt_ Out
SDA
SCL
SDA_ OUT
Iref
x12
Vport_ Pos
Vport_ Neg
Vport_ Sense
Sense_ Neg
MOSI
MISO
SCK
CS0
EEPROM_ CS
LSC
LSD
Ref
Port Neg
PG 0
PG1
PG2
V main
Vport_ Pos0
46 .4 K 200nF
0.5R
Fuse
Vport_ Neg0
x12
Vport_Pos 11
Vport_ Neg 11
SPI Communication
Bus
LED Driving
To Power Supplies
Power Good
Signals
Figure 4: Basic Application with AC Disconnect Support
Copyright © 2009
Rev. 1.0, 2009-03-03
Microsemi
Analog Mixed Signal Group
2381 Morse Avenue, Irvine, CA 92614, USA; Phone (USA): [phone], (ROW): [phone] Fax: [phone]
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