- 您现在的位置：买卖IC网 > Datasheet目录43 > MAX5952CUAX+ (Maxim Integrated)IC PSE CNTRLR FOR POE 36-SSOP Datasheet资料下载
参数资料
| 型号： | MAX5952CUAX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/50页 |
| 文件大小： | 1006K |
| 描述： | IC PSE CNTRLR FOR POE 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 类型： | 以太网供电控制器（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页
High-Power, Quad, PSE Controller
for Power-Over-Ethernet
18 ______________________________________________________________________________________
Powered Device Classification
(PD Classification)
During the PD classification mode, the MAX5952 forces
a probe voltage (-18V) at DET_ and measures the cur-
rent into DET_. The measured current determines the
class of the PD.
After each classification cycle, the device sets the
CL_END_ bit (R04h/05h[7:4]) high and reports the clas-
sification results in the status registers R0Ch[6:4],
R0Dh[6:4], R0Eh[6:4], and R0Fh[6:4]. The CL_END_ bit
is reset to low when read through register R05h or after
a port reset. Both status registers, R04h, and R05h are
cleared after the port powers down. Table 2 shows the
IEEE 802.3af requirement for a PSE classifying a PD at
the power interface (PI).
The MAX5952 supports high power beyond the IEEE
802.3af standard by providing additional classifications
(Class 5 and ping-pong classification).
Powered State
When the MAX5952 enters a powered state, the t
START
and t
DISC
timers are reset. Before turning on the port
power, the MAX5952 checks if any other port is not
turning on and if the t
FAULT
timer is zero. Another
check is performed if the ACD_EN bit is set, in this
case the OSC_FAIL bit must be low (oscillator is okay)
for the port to be powered.
If these conditions are met, the MAX5952 enters startup
where it turns on power to the port. An internal signal,
POK_, asserts high when V
OUT
is within 2V from V
EE
.
PGOOD_ status bits are set high if POK_ stays high
longer than t
PGOOD
. PGOOD immediately resets when
POK goes low.
The PG_CHG_ bit sets when a port powers up or down.
PWR_EN sets when a port powers up and resets when
a port shuts down. The port shutdown timer lasts 0.5ms
and prevents other ports from turning off during that
period, except in the case of emergency shutdowns
(RESET = L, RESET_IC = H, V
EEUVLO,
V
DDUVLO,
and
TSHD).
The MAX5952 always checks the status of all ports before
turning off. A priority logic system determines the order to
prevent the simultaneous turn-on or turn-off of the ports.
The port with the lesser ordinal number gets priority over
the others (i.e., port 1 turns on first, port 2 second, port 3
third and port 4 fourth). Setting PWR_OFF_ high turns off
power to the corresponding port.
Table 2. PSE Classification of a PD (Table
33-4 of the IEEE 802.3af)
MEASURED I
CLASS
(mA)
CLASSIFICATION
0 to 5
Class 0
> 5 and < 8
May be Class 0 and 1
8 to 13
Class 1
> 13 and < 16
May be Class 1 or 2
16 to 21
Class 2
> 21 and < 25
May be Class 2 or 3
25 to 31
Class 3
> 31 and < 35
May be Class 3 or 4
35 to 45
Class 4
> 45 and < 51
May be Class 4 or 5
51 to 68
Class 5
Figure 1. Detection, Classification, and Power-Up Port
Sequence
OUT_
-4V
-9V
-18V
-48V
t
t
DETI
t
DETII
t
CLASS
150ms
150ms
21.3ms
0V
0V
80ms
相关PDF资料 |
PDF描述 |
|---|---|
| MAX5953DUTM+ | IC INTERFACE 802.3AF 48TQFN |
| MAX5954LETX+T | IC PCI EXP/HOT-PLUG CTRLR 36TQFN |
| MAX5955BEEE+ | IC DUAL HOT-SWAP CTRLR 16-QSOP |
| MAX5957AETN+T | IC TRPL PCI EXP/HOT-PLUG 56-TQFN |
| MAX5960AECS+T | IC CTRLR HOT-PLUG QD 80-TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5952CUAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5952CUAX+T | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5952DEAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5952DEAX+T | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER QUAD PSE CONTROLLER FOR - Tape and Reel |
| MAX5952DUAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。