PD69008 - 8 Ports Power Over Ethernet Manager

Microsemi

Analog Mixed Signal Group

Page 13

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

Copyright

© 2009

Rev. 1.0, 2009-03-15

Configuration Pins _________________________________________

There are two main configuration pins utilized in the PD69008 (as shown in Figure 3) which configure the operation

mode of the chip and the communication addresses (SPI and I

PD69008

Ex _Reg

ASIC_INI

I2C_INI

VMain

VPeri 3.3v

ADC2P5

QGN D

Figure 3: Electronic Connection of Configuration Pins

Application information _______________________________________

The PD69008 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 dedicated PoE PCB, mounted on top of the switch’s main

PCB or into a 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 the PDs (Powered Devices) such as

telephones, cameras, wireless LANs, etc.

These Midspans include the PD69008 IC as a PoE control element, destined to inject power over the

communication lines.

Figure 4 and Figure 5 provide examples of basic applications of the PD69008 in an AC Disconnect Mode and the

DC Disconnect Mode: