PD671XXX-8 Datasheet, PDF (12/14 Pages) Microsemi Corporation – 24-Channel PoE AF and AT DIMM

PD671xxx - 8 / 12 / 24-Channel PoE AF and AT DIMM
Data Sheet (Non-confidential)
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:
ƒ Integrated directly into a switch:
Facilitates the entire PoE concept by
including the DIMMs on the main switch
PCB.
ƒ Daughter board add-on: DIMMs are
integrated into a small PCB for PoE,
mounted on top of the switch’s main
PCB.
ƒ 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 Figure 10: Overall PD671xxx DIMM at DC Disconnect
Wiring Diagram
Wiring Diagram
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: [phone], Outside the USA: [phone] Fax: [phone]