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| 型号： | SI3452C-B01-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 10/36页 |
| 文件大小： | 0K |
| 描述： | IC POE CONTROLLER MIDSPAN 40QFN |
| 特色产品： | Si3452 Quad High-Voltage Port Controller for PoE and PoE+PSEs |
| 标准包装： | 50 |
| 控制器类型： | 以太网供电控制器（POE） |
| 接口： | I²C |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 14mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
| 配用： | SMARTPSE24-KIT-ND - KIT EVAL REF 24PORT SPI/UART SI3480MS8-KIT-ND - KIT EVAL 8PORT SI3480/52/SI3500 |
| 其它名称： | 336-1834-5 |
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Si3452
18
Rev. 1.3
5.4. Port Configuration (Registers 0x0A–0x11)
These registers indicate the port configuration and are read/write registers.
The port priority bit is set if the port is not high priority. Low-priority ports are shut down when the shutdown low-
priority ports command is issued.
The “PoE+” bit specifies the dc current limit at either 425 mA or 850 mA nominal*.
*Note:
The PoE+ mode should be set correctly according to the electrical design of the PSE circuit (transformer and conductor
current carrying capacity). The PoE+ port mode can safely be changed prior to port turn-on, but changes after port turn-
on do not have an immediate effect and are not recommended.
“Disconnect enable” must be set for power to be removed if there is a disconnect. “Port mode” is set according to
ICUT is the nominal current level at which the port will automatically power down if ICUT is exceeded for 60 ms. It
can be set with 3.2 mA resolution. The accuracy of current measurement is approximately 5%; so, ICUT is normally
set 7% higher than the supported current level. ICUT is automatically set based on the classification result and
PoE+ mode. The automatically-set ICUT level is appropriate for a 45 V minimum system power supply for classes
0–3 and for a 51 V minimum power supply for PoE+ mode. This feature is classification policing.
If the Si3452 is in the semi-auto mode, ICUT will not be updated according to the classification result. This means
that if it is desired to set ICUT at port turn-on, this should be done before the port is turned on.
Once a port is turned on, ICUT can be changed dynamically. It is often undesirable to use a low value of ICUT during
port turn-on because inrush can trigger the ICUT event. For this reason, it is normal to allow the port to turn on with
the automatic ICUT setting and then later change this value after port current has stabilized and also if the PD and
PSE have negotiated for a different ICUT value based on the PoE L2 power negotiation protocol (LLDP).
The Si3452 supports 2-Event classification as defined in the IEEE 802.3at draft. 2-event classification is an
alternative to L2 power management where the PSE advertises it is capable of PoE powering by generating two
classification pulses. 2-Event classification is only supported for auto mode. If the Si3452 is in auto mode and the
first event classification result is Class 4, the mark, second event, and second mark are performed. Power is
applied only if the second event is also Class 4. If the second event is not Class 4, the classification error is
reported, and the port will not power. If the port is in manual mode, classification is done prior to turning on the port.
Table 17. Port Mode Selection
Port Mode Setting
B1, B0
Mode
Description
00b
Shutdown
The power is shut down with no detection pulses.
A command to manually power the port is ignored.
01b
Manual
The port can be powered by the manual power command.
10b
Semiauto
Detection is done and classification is done for Rgood, but the port does
not power.
11b
Auto
Detection classification and port powering are all automatic with no host
intervention required. ICUT and ILIM are automatically set according to
the PoE+ mode and classification result.
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相关代理商/技术参数 |
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|---|---|
| SI3452C-B01-GMR | 功能描述:热插拔功率分布 Quad PoE+ PSE Port Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| SI3452C-B02-GM | 制造商:Silicon Laboratories Inc 功能描述:QUAD POE+ PSE PORT CONTROLLER (AUTO, ENDPOINT, DV/DT DISCONN - Rail/Tube 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN |
| SI3452C-B02-GMR | 制造商:Silicon Laboratories Inc 功能描述:QUAD POE+ PSE PORT CONTROLLER (AUTO, ENDPOINT, DV/DT DISCONN - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN |
| Si3452D-B01-GM | 功能描述:热插拔功率分布 Quad PoE+ PSE Port Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| SI3452D-B01-GMR | 功能描述:热插拔功率分布 Quad PoE+ PSE Port Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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