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參數(shù)資料
| 型號： | SMARTPSE24-KIT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 12/36頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL REF 24PORT SPI/UART |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電源管理，以太網(wǎng)供電（POE），PSE |
| 已用 IC / 零件： | Si3452，Si3482，Si3500 |
| 已供物品： | 板，線纜，CD |
| 相關(guān)產(chǎn)品： | SI3482-A01-GM-ND - IC CTLR POE 24-48PORT PSE 24-QFN 336-1830-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1835-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1829-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1831-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1834-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1844-5-ND - IC POE SWITCH PWR OVER LAN 20QFN 336-1833-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1832-5-ND - IC POE CONTROLLER MIDSPAN 40QFN |
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Si3452
2
Rev. 1.3
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
PER PORT ANALOG
AD
2
AD
1
AD
3
HV SPI
&
Port
Control
VEE1
VOUT1
AOUT
Gate Control,
Current Limit
& Foldback
Detection
&
Classification
dV/dt
Disconnect
Channel
Mode
&
Limit
Control
VREF & Central Bias
MEAS
.
MU
X
PGA
DET4
VOUT2
VOUT3
DET3
DET2
G
ND1
2
AG
ND
VDD
VEE3
Thermal
Prot.
RB
IA
S
AD
0
VEE2
VEE4
DET1
VOUT4
Current
Sense
VR
EF
VE
E
DGN
D
AMUX
10b
ADC
Temp
Sensor
AIN
LV SPI
AD
1
AD0
AD
2
AD3
MCU Core
& PSE FSM
256 Byte SRAM
8 kByte EPROM
I2C
RS
T
PLL
Voltage
Regulator
& Monitor
VD
D
AGND
POR
WDT
IN
T
G
ND3
4
RST
SD
A
SCL
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