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參數(shù)資料
| 型號： | SI3452A-B01-GM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 18/36頁 |
| 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： | 336-1831-5 |
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Si3452
Rev. 1.3
25
6. Operational Notes
6.1. Port Turn On
If the port is turned on by putting it in auto mode, the Si3452 will take care of all specified timing, and it will take
care of the two-event classification if the first event result is Class 4 and PoE+ mode is enabled. However, if
automatic mode operation is not desired after port turn-on, the port should be set to semi-auto or manual mode
once it has powered. In automatic mode, ICUT is set according to the classification result.
The port turn-on command is used to turn on a port in semi-auto or manual mode. If the port is turned on in semi-
auto mode, turn-on is delayed until the next detection and classification. If the detection or classification result is
not valid, the port will not power. If the classification is Class 4 and PoE+ mode is enabled, a 2-event classification
is given. ICUT setting is not automatic for port turn-on in semi-auto or manual mode.
If the port is turned on by putting it in manual mode, the normal sequence is to start with the port in semi-auto mode
and interrupt on a classification complete, which indicates that there is a valid PD signature and that a classification
result is available. Based on the classification result, the host can make a decision to apply power or not. The IEEE
standard requires that a port be powered within 400 ms of a valid detect complete. It is also desirable to power the
port prior to the start of the next detection pulse, which can occur in as little as 300 ms. Therefore, it is
recommended that ports be powered in under 250 ms from the class complete interrupt when using the manual
mode turn-on command.
Using manual mode turn-on, detection is not done prior to port turn on, but classification is always performed just
prior to port turn on. Ports are turned on in manual mode regardless of the classification result. 2-event
classification is performed if the first event result is Class 4 and the port is enabled for PoE+ mode. The manual
mode classification step does not generate a classification complete flag because it is assumed that the
classification was already done in semi-auto mode and the host has already made the decision to grant power.
During the initial 60 ms (Tstart) time of port turn-on, 1x current limit and ICUT = 375 mA (nominal) is enforced. After
Tstart, if the port is not overloaded, Pgood is set to true, and ICUT and 1x or 2x current limit will follow the I2C
register settings. In auto mode, the I2C registers are set according to the classification result, but, if desired, they
can be overwritten after Pgood becomes true. After Tstart, 2x current limit is always allowed if PoE+ mode is
enabled.
6.2. Changing the Interrupt Mask
The INT register and INT pin are always synchronized. However, there can be up to a 5 ms delay between an
event that causes or clears an interrupt and the update of the register and pin.
Thus, if the INT mask register is changed to clear an interrupt or to block an interrupt source, there can be up to a
5 ms delay between the change of the INT mask register and the resultant change in the INT register and INT pin.
Generally, use of the mask register to clear interrupts is not recommended; it is better to clear an interrupt by
reading the appropriate COR register.
6.3. Port Voltage and Current Measurements
Port current voltage and current are reported as of the time the measurement command is written to register 0x12.
Spikes of current or other momentary current changes are not filtered. It may be desirable to add a ~1 second
averaging filter to reported current when using port current information for power management decisions.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI3452A-B01-GMR | 功能描述:熱插拔功率分布 Quad PoE PSE Port Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| Si3452A-B01-IM | 功能描述:熱插拔功率分布 Quad PoE PSE port controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| SI3452A-B01-IMR | 制造商:Silicon Laboratories Inc 功能描述: |
| SI3452A-B02-GM | 制造商:Silicon Laboratories Inc 功能描述:QUAD POE PSE PORT CONTROLLER (AUTO, ENDPOINT, DV/DT DISCONNE - Rail/Tube 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN |
| SI3452A-B02-GMR | 制造商:Silicon Laboratories Inc 功能描述:QUAD POE PSE PORT CONTROLLER (AUTO, ENDPOINT, DV/DT DISCONNE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC POE PSE PORT CTLR QUAD 40QFN |
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