PD69108/F

Copyright © 2013

Microsemi

Rev. 1.6

Analog Mixed Signal Group

1 Enterprise, Aliso Viejo, CA 92656, USA; Within the USA: (800) 713-4113, Outside the USA: (949) 221-7100 Fax: (949) 756-0308

1

TM

®

D ESC R I PTIO N

K E Y F E AT U RE S

Microsemi’s

PD69108

Power

over

Ethernet

(PoE)

Manager

integrates power, analog and state of the art logic into a single

48 pin, plastic QFN package.

The device is used in Ethernet

switches and Midspans, enabling network devices to share power

and data over the same cable.

The PD69108 device is an 8 ports, mixed-signal, high-voltage PoE

driver. It enables detection of IEEE802.3at-2009 compliant Type 1

and Type 2 PDs (Powered Devices), ensuring safe power feeding

and disconnection of ports with full digital control and a minimum of

external components.

The PD69108 executes all real time functions as specified in the

IEEE802.3af-2003 (“AF”) and IEEE802.3at-2009 High Power (“AT”)

standards, including load detection and “AF” and “AT” classification.

In addition, the PD69108 features Multiple Classification Attempts

(MCA) port status monitoring, and provides system level activities

such as power management and MIB support for system

management.

The PoE device is designed to detect and disable disconnected

ports utilizing DC disconnection methods, as specified in the IEEE

802.3af-2003 and IEEE802.3at-2009 standards.

The unit provides PD protection such as over-load, under-load,

over-voltage and short-circuiting.

It supports supply voltages

ranging from 44 to 57 VDC with no need for additional power supply

sources. The chip includes built-in internal thermal protection.

Optionally, the PD69108 can detect legacy/pre-standard PD

devices.

The PD69108 is a low power device using an internal MOSFET and

an external 0.36

Ω sense resistor.



IEEE802.3af-2003 compliant



IEEE802.3at-2009 compliant,

including two-event classification



Supports pre-standard PD detection



Supports Cisco devices detection



Single DC voltage input (44 to 57

VDC)



Input voltage out of range protection



Wide temperature range: -10°C to

+85°C



PD69108F version covering -40°C to

+85°C



Over-temperature protection



Low power dissipation (0.36

Ω sense

resistor and 0.3

Ω MOSFET Rdson)



Includes Reset command pin



4 x direct address configuration pins



Continuous port monitoring and

system data



Configurable load current setting



Configurable AT/AF modes



Configurable standard and legacy

detection mode



Power soft start mechanism



On-chip thermal protection



Voltage monitoring/protection



Built in 3.3 VDC and 5 VDC regulators



Internal power on reset



RoHS compliant



Emergency power management

supporting four configurable power

bank I/Os



Can be cascaded to up to 12 PoE

devices (96 ports)