si3482 Silicon Laboratories, si3482 Datasheet

si3482

Manufacturer Part Number

si3482

Description

Power Management Controller

Manufacturer

Silicon Laboratories

Datasheet

1.SI3482.pdf (38 pages)

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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.

Rev. 0.1 10/10

OWER

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)

Power over Ethernet Endpoint

switches and Midspans for IEEE Std

802.3af and 802.3at

Supports high-power PDs, such as:



Security and RFID systems

Pan/Tilt/Zoom security cameras

802.11n WAPs

Multi-band, multi-radio WAPs

ANAGEMENT



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)



Extended operation range

(–40 to +85 °C)

Industrial automation systems

Networked audio

IP Phone Systems and iPBXs

Metropolitan area networked WAPs,

cameras, and sensors

WiMAX, ASN/BTS, and CPE/ODU

systems

4x4 mm PCB footprint; RoHS

complaint

ON TROLLER

RSVD

See "5. Pin Descriptions" on page 31.

MISO

GND

VDD

SCK

RST

Pin Assignments

(Pads on Bottom of Package)

24-Pin QFN

Si3482

Top View

Si3482

SDA

SCL

BAUD0

BAUD1

BAUD2

PSLCT

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