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參數(shù)資料
| 型號： | MAX5935EAX+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 28/44頁 |
| 文件大?。?/td> | 700K |
| 描述： | IC CTRLR POWER QUAD 36-SSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 30 |
| 類型： | 以太網(wǎng)供電控制器（PoE） |
| 應(yīng)用： | 遠程外設(shè)（工業(yè)控制，相機，數(shù)據(jù)訪問） |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | -32 V ~ -60 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-BSOP（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 36-SSOP |
| 包裝： | 管件 |
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Setting BCKOFF_ to 1 (Table 18) enables cadence
timing on each port, where the port backs off and waits
2.2s after each failed load discovery detection. The IEEE
802.3af standard requires a PSE that delivers power
through the spare pairs (midspan PSE) to have cadence
timing. A reset sets R14h = 0000XXXX, where X is the
logic AND of the MIDSPAN and AUTO input state prior to
a reset. BCKOFF_ can be changed by software at any
time while changes to the MIDSPAN and AUTO input
state during normal operation are ignored.
TSTART[1,0] (Table 19) programs the startup timers.
Startup time is the time the port is allowed to be in current
limit during startup. TFAULT_[1,0] programs the fault
time. Fault time is the time allowable for the port to be in
current limit during normal operation. RSTR[1,0] pro-
grams the discharge rate of the TFAULT_ counter and
effectively sets the time the port remains off after an over-
current fault. TDISC[1,0] programs the load disconnect
detection time. The device turns off power to the port if it
fails to provide a minimum power maintenance signal for
longer than the load disconnect detection time (TDISC).
Set the bits in R16h to scale the TSTART, TFAULT, and
TDISC to a multiple of their nominal value specified in
the Electrical Characteristics table. R27h and R28h fur-
ther extend the programming range of these timers and
also increase the programming resolution.
When the MAX5935 shuts down a port due to an
extended overcurrent condition (either during startup or
normal operation), if RSRT_EN is set high, then the part
does not allow the port to power back on before the
restart timer (Table 19a) returns to zero. This effectively
Quad Network Power Controller
for Power-Over-LAN
28 ______________________________________________________________________________________
MODE
DESCRIPTION
00
Shutdown
01
MANUAL
10
Semi AUTO
11
AUTO
Table 15a. Mode Status
ADDRESS = 13h
YMB L
BIT
R/W
DESCRIPTION
ACD_EN4
7
R/W
Enable AC disconnect detection on ort 4
ACD_EN3
6
R/W
Enable AC disconnect detection on ort 3
A D EN2
5
R/W
En l A i nn
i n n r 2
ACD_EN1
4
R/W
Enable AC disconnect detection on ort 1
DCD_EN4
3
R/W
Enable DC disconnect detection on ort 4
DCD_EN3
2
R/W
Enable DC disconnect detection on ort 3
DCD_EN2
1
R/W
Enable DC disconnect detection on ort 2
D D EN1
0
R/W
En l D i nn
i n n r 1
Table 16. Load Disconnect Detection Enable Register
ADDRESS = 14h
YMB L
BIT
R/W
DESCRIPTION
CLASS_EN4
7
R/W
Enable classification on ort 4
CLASS_EN3
6
R/W
Enable classification on ort 3
CLASS_EN4
5
R/W
Enable classification on ort 2
CLASS_EN3
4
R/W
Enable classification on ort 1
DET EN4
3
R/W
En l
i n n r 4
DET_EN3
2
R/W
Enable detection on ort 3
DET_EN2
1
R/W
Enable detection on ort 2
DET EN1
0
R/W
En l
i n n r 1
Table 17. Detection and Classification Enable Register
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| MAX5935EAX+ | 功能描述:熱插拔功率分布 Quad Network Power 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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