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SI3482 Datasheet(PDF) 1 Page - Silicon Laboratories |
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SI3482 Datasheet(HTML) 1 Page - Silicon Laboratories |
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1 / 38 page  Rev. 0.1 10/10 Copyright © 2010 by Silicon Laboratories Si3482 P OWER M ANAGEMENT C ONTROLLER Features Applications Description The Si3452 is capable of delivering over 30 W per port, which means that, in a 24- or 48-port system, a very large power supply would have to be used to avoid overload. Typically, not all ports are used at full power; so, a smaller power supply in the range of 5 W per port can be used along with the Si3482 power management controller. The Si3482 is a power manager intended for use with the Si3452/3 Power over Ethernet (PoE) controllers for power management of up to 48 ports with three power sources. Use of the Si3482 power manager greatly simplifies system implementation of power management. The Si3482 power management controller is programmed via a SPI or UART interface to set the power supply capacity, the port power configuration (Category 1: 15.4 W, or high-power category 2: 30 W) ports, the port priority, the detection timing (Alternative A or Alternative B), and the fault recovery protocol. Once programmed, the configuration data can be saved, and the Si3482 can work without host intervention. If desired, port and overall status information is available and continuously updated. The Si3482 uses the real-time overload and current monitoring capability of the Si3452 to manage provided power among up to 48 ports. Power management is selectable between grant-based or consumption-based in order to supply power to the greatest number of ports. In high-reliability systems, multiple power supplies are often connected to provide redundancy, which further increases the power supply requirements. The Si3482 can manage up to three power supplies automatically enabling or disabling ports in priority order when required. Enables use of smaller power supplies for up to 48-port PoE systems with Si3452 PSE interface ICs Can operate with or without a host Configuration save Pin-selectable SPI or UART interface Pin-selectable UART data rate Fully-compliant with IEEE 802.3 clause 33 for PoE including the 802.3at amendment for higher power (30 W, category 2 ports) Supports classification-based and LLDP power negotiation Supports individual port priority and port configuration Supports Power supply status from up to 3 power supplies 24 pin Quad flat pack package (4x4 mm) 4x4 mm PCB footprint; RoHS complaint Extended operation range (–40 to +85 °C) Power over Ethernet Endpoint switches and Midspans for IEEE Std 802.3af and 802.3at Supports high-power PDs, such as: Pan/Tilt/Zoom security cameras 802.11n WAPs Multi-band, multi-radio WAPs Security and RFID systems Industrial automation systems Networked audio IP Phone Systems and iPBXs Metropolitan area networked WAPs, cameras, and sensors WiMAX, ASN/BTS, and CPE/ODU systems Pin Assignments 24-Pin QFN See "5. Pin Descriptions" on page 31. 2 3 4 5 MISO SCK GND RST RSVD PSLCT BAUD2 BAUD1 SCL BAUD0 17 16 15 14 18 13 VDD SDA 6 1 Top View (Pads on Bottom of Package) Si3482 |
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