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STE12PS Arkusz danych(PDF) 1 Page - STMicroelectronics |
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STE12PS Arkusz danych(HTML) 1 Page - STMicroelectronics |
1 / 44 page 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 ■ 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 500m Ω, 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 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 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. In AUTO mode b. In MANUAL mode PBGA23x23 PBGA23x23 www.st.com Obsolete Product(s) - Obsolete Product(s) |
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