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參數(shù)資料
| 型號： | MAX5945CAX+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 19/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC NETWORK PWR CTRL 36-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 30 |
| 控制器類型： | 網(wǎng)絡(luò)電源控制器 |
| 接口： | I²C |
| 電源電壓： | 3.3V |
| 電流 - 電源： | 4.2mA |
| 工作溫度： | 0°C ~ 70°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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MAX5945
function. OSC_FAIL generates an interrupt only if at
least one of the ACD_EN (R13h[7:4]) bits is set high.
A thermal-shutdown circuit monitors the temperature of
the die and resets the MAX5945 if the temperature
exceeds +150°C. TSD is set to 1 after the MAX5945
returns to normal operation. TSD is also set to 1 after
every UVLO reset.
When VDD and/or |VEE| is below its undervoltage lock-
out (UVLO) threshold, the MAX5945 is in reset mode
and securely holds all ports off. When VDD and |VEE|
rise to above their respective UVLO thresholds, the
device comes out of reset as soon as the last supply
crosses the UVLO threshold. The last supply corre-
sponding UV and UVLO bits in the supply event regis-
ter will be set to 1.
A 1 in any supply event register’s bits forces R00h[7] to
1. As with any other events register, the supply event
register has two addresses. When read through the
R0Ah address, the content of the register is left
unchanged. When read through the CoR R0Bh
address, the register content will be cleared. A reset
sets R0Ah/R0Bh to 00100001 if VDD comes up after
VEE or to 00010100 if VEE comes up after VDD.
The port status register (Table 12) records the results of
the detection and classification at the end of each phase
in three encoding bits each. R0Ch contains detection and
classification status of port 1. R0Dh corresponds to port
2, R0Eh corresponds to port 3 and R0Fh corresponds to
port 4. Tables 12a and 12b show the detection/classifica-
tion result decoding charts, respectively.
As a protection, when POFF_CL (R17h[3], Table 20) is
set to 1, the MAX5945 prohibits turning on power to the
port that returns a status 111 after classification. A reset
sets 0Ch, 0Dh, 0Eh, and 0Fh = 00h.
PGOOD_ is set to 1 (Table 13) at the end of the power-up
startup period if the power-good condition is met (0 <
(VOUT - VEE) < PGTH). The power-good condition must
remain valid for more than tPGOOD to assert PGOOD_.
PGOOD_ is reset to 0 whenever the output falls out of the
power-good condition. A fault condition immediately
forces PGOOD_ low.
PWR_EN_ is set to 1 when the port power is turned on.
PWR_EN_ resets to 0 as soon as the port turns off. Any
transition of PGOOD_ and PWR_EN_ bits set the corre-
sponding bit in the power event registers R02h/R03h
(Table 7). A reset sets R10h = 00h.
A3, A2, A1, A0 (Table 14) represent the four LSBs of the
MAX5945 address (Table 3). During a reset, the device
latches into R11h. These four bits address from the cor-
responding inputs as well as the state of the MIDSPAN
and AUTO inputs. Changes to those inputs during nor-
mal operation are ignored.
The MAX5945 uses two bits for each port to set the mode
of operation (Table 15). Set the modes according to
Table 15a.
A reset sets R12h = AAAAAAAA where A represents
the latched-in state of the AUTO input prior to the reset.
Use software to change the mode of operation.
Quad Network Power Controller
for Power-Over-LAN
26
______________________________________________________________________________________
DET_ST_[2:0]
DETECTED
DESCRIPTION
000
None
Detection status unknown
001
DCP
Positive DC supply connected at the port (AGND - VOUT_ < 1.65V)
010
HIGH CAP
High capacitance at the port (>5F)
011
RLOW
Low resistance at the port. RPD < 17k
.
100
DET_OK
Detection pass. 17k
> RPD > 28k.
101
RHIGH
High resistance at the port. RPD > 28k
.
110
OPEN0
Open port (I < 12.5A)
111
DCN
Negative DC supply connected to the port (VOUT - VEE < 2V)
Table 12a. Detection Result Decoding Chart
CLASS_[2:0]
CLASS RESULT
000
Unknown
001
1
010
2
011
3
100
4
101
Undefined (treated as CLASS 0)
110
0
111
Current limit (>ICILIM)
Table 12b. Classification Result
Decoding Chart
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5945CAX+ | 功能描述:熱插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945CAX+T | 功能描述:熱插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945CAX-T | 功能描述:熱插拔功率分布 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 |
| MAX5945EAX | 功能描述:熱插拔功率分布 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 |
| MAX5945EAX+ | 功能描述:熱插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
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