PD69012 - 12 Ports Power Over Ethernet Manager

Microsemi

Analog Mixed Signal Group

2381 Morse Avenue, Irvine, CA 92614, USA; Phone (USA): (800) 713-4113, (ROW): (949) 221-7100 Fax: (949) 756-0308

Page 16

Copyright

© 2009

Rev. 1.0, 2009-03-03

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:

MISO

SCK

CS0

EEPROM_ CS

MOSI

R1

R2

R3

R4

Ext_Reg

ASIC_ INI

I2 C_ INI

Reset

SDA

SCL

Disable_ Ports_ N

200nF

46 .4 K

0.5R

Vport_ Pos0

Vport_ Neg0

FET_gate

Vport_ Sense

Vport_ Neg

Vport_ Sense

Vport_Neg 11

Vp eri 3.3v

Sense_ Neg

ADC2P5

SPI Communication

Bus

SDA_OUT

x12

x12

Vport_ Neg

I

Iref

Ref

Port Neg

CP_ OUT

CP_IN

Vmain :44÷ 57v

Vmain

VCC2P5

PG1

PG2

PG 0

Power Good

Signals

To Power Supplies

Interupt_ Out

LSC

LSD

LED Driving

Vport_ Pos

Vport_ Pos

Vport_Pos 11

Vperi 3.3 v

Add if line

is not in use

Fuse

Figure 4: Basic Application with AC Disconnect Support