STE12PS
12 channel integrated PSE line manager
Data Brief
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 Current sensing with as low as 500 m, external, series resistors No need for external FETs In-rush current control Short-circuit protection Adaptable signature detection capability On-chip 3.3V SMPS controller Low-noise, 12-bit ADC Standard I2C interface Parallel monitor interface
PBGA23x23
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 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.
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,
a. In AUTO mode b. In MANUAL mode
December 2006
Rev 1
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www.st.com
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For further information contact your local STMicroelectronics sales office.
Block diagram
STE12PS
Applications
IP phones Web cam WLAN access points Midspan power supply Ethernet Switches/Routers
Block diagram
Figure 1. STE12PS block diagram
Analog front end
I2C interface Smart power & port priority management Power-on control inrush current limiting Programmable detection/ classification 12-bit ADC
Line detection classification monitoring AC disconnect ~ generator & 50Hz detector 12 x power switches 3.3V SMPS controller Internal clock generator
PC00101
Programmable timer settings Monitoring output interface
Digital controller
Tri-level temperature protection
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STE12PS
Ordering information
Ordering information
Table 1. Order codes
Temp range, C -40 to +85 Package PBGA (23mm x 23mm x 1.82mm)
Part number E-STE12PS(1)
1. E-: ECOPACK
Revision history
Table 2.
Date 05-Dec-2006
Document revision history
Revision 1 Initial release. Changes
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STE12PS
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