Preliminary Data

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to

change without notice.

August 2007

Rev 3

1/44

44

STE12PS

12 channel integrated PSE line manager

Features

“boosted” ports

Ω,

external, series resistors

Description

STE12PS is designed to supply power over

multiple Ethernet channels in order to avoid

different, individual power supply units for

applications such as Web cams, IP Phones,

Bluetooth access points and WLAN access

points.

The equipment that provides the power to the

twisted pair cabling is referred to as Power

Sourcing Equipment (PSE).

The PSE’s main functions are: looking for links to

a Powered Device (PD), classifying a PD,

supplying power to the link, monitoring power on

the link, and removing power from the link.

The STE12PS is fully programmable, supporting

the detection and powering of IEEE802.3af as

well as legacy PDs. The flexibility of the STE12PS

allows the user to select a suitable system

configuration: up to 12 ports as well as 4(a) or 6(b)

“boosted” channels. If needed, the STE12PS can

also efficiently manage cases or applications

where a limited amount of power is available to

the ports (smart-power capability) by means of

integrated, power MOSFET devices. All

notifying externally some ports status condition

via dedicated pins.

Ethernet port isolation can be easily maintained

thanks to an integrated 3.3V SMPS power source

and by means of optocouplers.

The STE12PS has five address selection inputs

to choose up to 32 possible different addresses.

Power can be provided to the PD using either

spare lines of the Ethernet cable or using the data

wires, as specified by IEEE 802.3af.

a.

In AUTO mode

b.

In MANUAL mode

PBGA23x23

PBGA23x23

www.st.com

Obsolete

Product(s)

- Obsolete

Product(s)