PD671xxx - 8 / 12 / 24-Channel PoE AF and AT DIMM

Data Sheet (Non-confidential)

Copyright © 2009

Microsemi

Page 11

Rev. 1.0 / 17-March-10

Analog Mixed Signal Group

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

PD69012 Circuitry

All PD69012s work in slave mode, under control of

the PD69000G. The PoE Managers, each

controlling 12 output ports, are further detailed in

Figure 8. The ports can be disabled by the

Ethernet switch via the xDisable_Ports signal or by

the PoE controller, as required during operation.

For further details on the PoE manager, refer to the

PoE manager PD69012 Data Sheet, Catalogue

Number 06-0072-058.

AC Disconnect Diodes

When deploying an application that utilizes the AC

disconnect method, carefully select the diode type

and diode location on the mother board. The diode

should be located away from the DIMM to prevent

mutual heating and the ventilation should be

doubled to deal with higher power dissipation. The

AC disconnect diode should be connected as

shown in Figure 9.

DC Disconnect

Using the DC disconnect method, the mother board

should contain a short circuit between Vmain

coming from the power supply and Port_P[0-23] as

illustrated in Figure 10.

PD671xxx DIMM Evaluation

Board __________________

The performance features of Microsemi’s PoE

DIMMs can be fully appreciated using the

PD671xxx - DIMM Evaluation Board.

The Evaluation Board allows the designer to

evaluate all of the DIMMs accessible functions.

Enhanced mode configuration for up to 48 ports is

supported.

Applications_______________

The DIMMs can be integrated into a number of

applications, ranging from daughter boards to full

integration into Ethernet switches.

Examples of such applications are as follows:

Integrated directly into a switch

:

Facilitates the entire PoE concept by

including the DIMMs on the main switch

PCB.

Daughter board add-on

: DIMMs are

integrated into a small PCB for PoE,

mounted on top of the switch’s main

PCB.

Midspan units

: Stand-alone devices,

installed between the Ethernet switch

and powered devices (telephone,

camera, wireless LAN, etc.). These

Midspan units include the DIMMs as a

PoE control element, injecting power

over the communication lines.

Figure 9: Overall PD671xxx DIMM at AC Disconnect

Wiring Diagram

Figure 10: Overall PD671xxx DIMM at DC Disconnect

Wiring Diagram