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Si3452 Datasheet Preview

Si3452 Datasheet

QUAD HIGH-VOLTAGE PORT CONTROLLER

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Si3452 pdf
Si3452
QUAD HIGH-VOLTAGE PORT CONTROLLER
FOR POE AND POE+ PSES
Features
Each Si3452 high-voltage port
Programmable architecture supports
controller supports four PSE power IEEE 802.3af (PoE) and IEEE
interfaces
802.3at (PoE+) PSEs
Programmable current limits for PoE Programmable current limits for
(15.4 W), PoE+ (30 W), and
PoE (350 mA) and PoE+
proprietary systems (up to 40 W) per
(600 mA), and custom limits to
port 850 mA
I2C interface requires no external
Per-port current and voltage
MCU for easy, low-cost management
monitoring for sophisticated power
of 4 to 48 ports by the host system
management and control
Unique mixed-signal IC high-voltage Power policing mode
component integration simplifies
Robust multi-point detection
design, lowers power dissipation,
Supports 1-Event and 2-Event
minimizes external BOM, and
classification algorithms
reduces PCB footprint
Comprehensive, robust, fault-
Internal low-RON power FETs with
current-sense circuitry
Integrated transient voltage surge
suppressors
protection circuitry
Supply undervoltage lockout
(UVLO)
Output current limit and short-
Proprietary dV/dt disconnect
sensing methods
Industrial (–40 to 85 °C) operating
temperature
Compact, 6×6 mm2, 40-pin QFN
RoHS-compliant package
circuit protection
Foldback current limiting
Dual-threshold thermal overload
protection
Fault source reporting for
intelligent port management
Applications
Power over Ethernet Endpoint
Industrial automation systems
switches and Midspans for IEEE Std Networked audio
802.3af and 802.3at
IP Phone Systems and iPBXs
Supports high-power PDs, such as: Metropolitan area networked WAPs,
Pan/Tilt/Zoom security cameras
cameras, and sensors
802.11n WAPs
WiMAX ASN/BTS and CPE/ODU
Multi-band, multi-radio WAPs
systems
Security and RFID systems
Ordering Information:
See page 31.
Pin Assignments
40-Pin QFN
VEE1 1
VEE 2
VREF 3
AIN 4
AOUT 5
AGND 6
RBIAS 7
AGND 8
NC 9
VEE4 10
Si3452
(Top View)
30 VDD
29 DGND
28 AD0
27 AD1
26 AD2
25 AD2
24 AD3
23 RST
22 VEE3
21 AD3
See "9. Pin Descriptions" on page 28.
Rev. 1.5 1/15
Copyright © 2015 by Silicon Laboratories
Si3452



Silicon Laboratories
Silicon Laboratories

Si3452 Datasheet Preview

Si3452 Datasheet

QUAD HIGH-VOLTAGE PORT CONTROLLER

No Preview Available !

Si3452 pdf
Si3452
Description
When connected directly to the host system or configured in Auto mode, each Si3452 high-voltage port controller
provides all of the critical circuitry and sophisticated power measurement functionality for the high-voltage
interfaces of four complete PSE ports. The Si3452 fully integrates robust, low-RON (0.3 typical) power MOSFET
switches, low-power dissipation current sensing circuitry, and transient voltage surge suppression devices.
The on-chip current sense circuitry and power MOSFETs provide programmable scaling of current limits to match
either PoE (350 mA, 15.4 W), PoE+ (600 mA, 30 W), and extended (800 mA, 40 W) power requirements on a per-
port basis. Designed for use in Endpoint PSE (e.g., Ethernet switches) or Midspan PSE (e.g., inline power
injectors) applications, each Si3452 also performs the IEEE-required powered device (PD) detection, classification,
and disconnect functionality.
The flexible architecture enables powered device disconnect detection using Silicon Laboratories' proprietary dV/dt
disconnect sensing algorithm. dV/dt disconnect is an alternative to dc disconnect that requires no additional BOM
components, does not dissipate extra device power, and fully interoperates with all powered devices. Also provided
are multi-point detection algorithms and per-port current and voltage monitoring.
Intelligent protection circuitry includes power supply undervoltage lockout (UVLO), port output current limiting and
short-circuit protection, thermal overload sensing and port shutdown, and transient voltage surge suppressors
capable of protecting the Si3452 from a variety of harsh surge events seen on the RJ-45 interface.
To maximize system design flexibility and minimize cost, each Si3452 connects directly to a system host controller
through an I2C serial interface, eliminating the need for an external MCU. The Si3452 can be set to one of 12
unique addresses, allowing control of up to 48 ports on a single I2C bus.
Functional Block Diagram
MCU Core
& PSE FSM
LV SPI
256 Byte SRAM
8 kByte EPROM
POR
PLL
Temp
Sensor
WDT
10b
ADC
Voltage
I2C Regulator
& Monitor
HV SPI
&
Port
Control
PGA
Channel
Mode
&
Limit
Control
PER PORT ANALOG
Detection
&
Classification
dV/dt
Disconnect
Gate Control,
Current Limit
& Foldback
VREF & Central Bias
Thermal
Prot.
Current
Sense
DET4
DET3
DET2
DET1
VOUT4
VOUT3
VOUT2
VOUT1
2 Rev. 1.5


Part Number Si3452
Description QUAD HIGH-VOLTAGE PORT CONTROLLER
Maker Silicon Laboratories
Total Page 30 Pages
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