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參數(shù)資料
| 型號(hào)： | MAX5945CAX |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Quad Network Power Controller for Power-Over-LAN |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封裝： | 0.80 MM PICTH, SSOP-36 |
| 文件頁(yè)數(shù)： | 32/44頁(yè) |
| 文件大?。?/td> | 572K |
| 代理商： | MAX5945CAX |
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M
the bits in register R12h to 00. A high in HWMODE_
switches the port into auto mode by setting the bits in
register R12h to 11. If WD_INT_EN is set, an interrupt is
sent if any of the SMODE bits are set.
A reset sets R1Fh = 00h.
Use IGATE[2:0] (Table 27) to set the gate pin pullup
current, I
PU
, according to the following formula:
I
PU
= 50μA - 6.25 x N
where N is the decimal value of IGATE[2:0].
Use AC_TH[2:0] to program the current threshold of the
AC disconnect comparator according to the following
formula:
IAC_TH = 213.68μA + 28.33μA x N
where N is the decimal value of AC_TH[2:0].
Note:
The programmed value has the same percent-
age tolerance as the value specified in the
Electrical
Characteristics
.
When set low, DET_BYP inhibits port power-on if the
discovery detection was bypassed in AUTO mode.
When set high, it allows the part to turn on power to a
non-IEEE 802.3af load without doing detection. If
OSCF_RS is set high, the OSC_FAIL bit is ignored.
A reset sets R23h = 04h, which sets I
PU
= 50μA and
I
AC_TH
= 325μA as shown in the
Electrical
Characteristics
.
Use R27h (Table 28) to program the current-limit
threshold, V
SU_LIM
, and the nominal load disconnect
detection time, t
DISC
nominal.
Use IMAX[3:0] to program the current-limit trip voltage
according to the following formula:
V
SU_LIM
= 135mV + 19.25mV x N
where N is the decimal value of IMAX[3:0]. The
V
FAULT_LIM
limit scales proportionally to the V
SU_LIM
value (I
FAULT
= 88% of V
SU_LIM
).
A reset sets R27h = 47h, which sets V
SU_LIM
= 212mV
(typical) as shown in the
Electrical Characteristics
. The
default threshold is set to meet the IEEE 802.3af stan-
dard when using an R
SENSE
= 0.5
±1%, 100ppm.
Quad Network Power Controller
for Power-Over-LAN
32
______________________________________________________________________________________
ADDRESS = 1Eh
SYMBOL
BIT
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DESCRIPTION
WDTIME[7]
WDTIME[6]
WDTIME[5]
WDTIME[4]
WDTIME[3]
WDTIME[2]
WDTIME[1]
WDTIME[0]
WDTIME
Table 25. Watchdog Timer Register
ADDRESS = 1Fh
SYMBOL
EN_WHDOG
WD_INT_EN
Reserved
Reserved
HWMODE4
HWMODE3
HWMODE2
HWMODE1
BIT
7
6
5
4
3
2
1
0
R/W
R/W
—
—
R/W
R/W
R/W
R/W
R/W
DESCRIPTION
A logic high enables the watchdog function
Enables interrupt on SMODE_ bits
Port 4 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
Port 3 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
Port 2 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
Port 1 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
Table 26. Switch Mode Register
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5945EAX | Quad Network Power Controller for Power-Over-LAN |
| MAX5948 | AND-OR-invert Gates 14-CFP -55 to 125 |
| MAX5948A | -48V Hot-Swap Controllers with External RSENSE |
| MAX5948AESA | -48V Hot-Swap Controllers with External RSENSE |
| MAX5948B | 4-2-3-2 Input AND-OR-invert Gates 14-CDIP -55 to 125 |
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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