SI3483 Datasheet, PDF (1/52 Pages) Silicon Laboratories – POWER MANAGEMENT CONTROLLER

Si3483
POWER MANAGEMENT CONTROLLER
Features
 Enables use of smaller power
 Supports classification-based and
supplies for up to 64-port PoE
LLDP power negotiation
systems with Si3459 and Si3454  Supports individual port priority and
PSE interface ICs
port configuration
 Can operate with or without a host _{ Supports Power supply status from}
 Configuration save capability
up to 3 power supplies
 Pin-selectable SPI or UART interface 24-pin Quad flat pack package
 Pin-selectable UART data rate
4x4 mm PCB footprint; RoHS
 Fully-compliant with IEEE 802.3-AT
complaint
Types I and II
 Extended temperature operating
range (–40 to +85 °C)
Applications
 Power over Ethernet Endpoint
 Industrial automation systems
switches and Midspans
 Networked audio
 Supports high-power PDs, such as:  IP Phone Systems and iPBXs
Pan/Tilt/Zoom security cameras
Wireless Access Points
Security and RFID systems
Description
The Si3483 is a power manager intended for use with the Si3459 Power over
Ethernet (PoE) controllers for power management of up to 64 ports with three
power sources.
The Si3459 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
can be used along with the Si3483 power management controller.
Use of the Si3483 power manager greatly simplifies system implementation of
power management. The Si3483 power management controller is programmed
via a SPI or UART interface to set the system power supply capacity, the port
power configuration (Type 1: 15.4 W, or high-power Type 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 Si3483
can work without host intervention. Port and overall status information is available
and continuously updated.
The Si3483 uses the real-time overload and current monitoring capability of the
Si3459 to manage power shared among up to 64 ports. Power management is
selectable between grant-based or consumption-based algorithms 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 monitoring requirements.
The Si3483 can manage up to three power supplies automatically, enabling or
disabling ports in priority order.
Pin Assignments
24-Pin QFN
MISO 1
SCK 2
GND 3
VDD 4
RST ⁵
RSVD ⁶
Top View
(Pads on Bottom of Package)
18 SDA
17 SCL
16 BAUD0
15 BAUD1
14 BAUD2
13 PSLCT
See "5. Pin Descriptions" on page 43.
Confidential Rev. 1.1 6/15
Copyright © 2015 by Silicon Laboratories
Si3483