Datasheet > STE12PS

STE12PS

更新时间： 2024-02-22 09:51:12

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
44页	794K
描述
12 channel integrated PSE line manager

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STE12PS 数据手册

STE12PS

12 channel integrated PSE line manager

Preliminary Data

Features

■ PSE power control device

■ Supports up to 12 independent, 4^(a)or 6^(b)30W

“boosted” ports

■ Wide operating range: up to 90V

■ IEEE 802.3af compliant

■ Open circuit detection: AC and DC methods

■ Advanced power management algorithm

PBGA23x23

■ Current sensing with as low as 500mΩ,

external, series resistors

■ No need for external FETs

■ In-rush current control

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

■ Short-circuit protection

■ Adaptable signature detection capability

■ On-chip 3.3V SMPS controller

■ Low-noise, 12-bit ADC

■ Standard I²C interface

■ Parallel monitor interface

operations are controlled via the I²C bus also

notifying externally some ports status condition

via dedicated pins.

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.

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.

The equipment that provides the power to the

twisted pair cabling is referred to as Power

Sourcing Equipment (PSE).

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.

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.

a. In AUTO mode

b. In MANUAL mode

August 2007

Rev 3

1/44

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

change without notice.

www.st.com

12 3 4 5 6 7...44

中文翻译

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