STE12PS Datasheet, PDF (1/44 Pages) STMicroelectronics – 12 channel integrated PSE line manager

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
t(s) ■ Current sensing with as low as 500mΩ,
external, series resistors
uc ■ No need for external FETs
d _{■ In-rush current control}
ro _{■ Short-circuit protection}
te ^{P ■ Adaptable signature detection capability}
le ^{■ On-chip 3.3V SMPS controller}
o _{■ Low-noise, 12-bit ADC}
bs ■ Standard I²C interface
O _{■ Parallel monitor interface}
t(s) ^{- Description}
c _{STE12PS is designed to supply power over}
u _{multiple Ethernet channels in order to avoid}
d _{different, individual power supply units for}
ro _{applications such as Web cams, IP Phones,}
P _{Bluetooth access points and WLAN access}
te ^points.
le _{The equipment that provides the power to the}
o _{twisted pair cabling is referred to as Power}
bs ^{Sourcing Equipment (PSE).}
O_{The PSE’s main functions are: looking for links to}
PBGA23x23
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
operations are controlled via the I²C bus also
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 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
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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