參數(shù)資料
型號(hào)： SI3452B-B01-GM
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 10/36頁(yè)
文件大?。?/td> 0K
描述： IC POE CONTROLLER MIDSPAN 40QFN
特色產(chǎn)品： Si3452 Quad High-Voltage Port Controller for PoE and PoE+PSEs
標(biāo)準(zhǔn)包裝： 50
控制器類型： 以太網(wǎng)供電控制器（POE）
接口： I²C
電源電壓： 3 V ~ 3.6 V
電流 - 電源： 14mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 40-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-QFN（6x6）
包裝： 管件
配用： SMARTPSE24-KIT-ND - KIT EVAL REF 24PORT SPI/UART
SI3480MS8-KIT-ND - KIT EVAL 8PORT SI3480/52/SI3500
其它名稱： 336-1833-5
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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