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参数资料
| 型号： | MAX5945EAX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/44页 |
| 文件大小： | 0K |
| 描述： | IC NETWORK PWR CTRL 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 控制器类型： | 网络电源控制器 |
| 接口： | I²C |
| 电源电压： | 3.3V |
| 电流 - 电源： | 4.2mA |
| 工作温度： | -40°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 |
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MAX5945
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, IPU, according to the following formula:
IPU = 50A - 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 = 213.68A + 28.33A 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 IPU = 50A and
IAC_TH = 325A as shown in the Electrical
Characteristics.
Use R27h (Table 28) to program the current-limit
threshold, VSU_LIM, and the nominal load disconnect
detection time, tDISC nominal.
Use IMAX[3:0] to program the current-limit trip voltage
according to the following formula:
VSU_LIM = 135mV + 19.25mV x N
where N is the decimal value of IMAX[3:0]. The
VFAULT_LIM limit scales proportionally to the VSU_LIM
value (IFAULT = 88% of VSU_LIM).
A reset sets R27h = 47h, which sets VSU_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 RSENSE = 0.5 ±1%, 100ppm.
Quad Network Power Controller
for Power-Over-LAN
32
______________________________________________________________________________________
ADDRESS = 1Eh
SYMBOL
BIT
R/W
DESCRIPTION
7
R/W
WDTIME[7]
6
R/W
WDTIME[6]
5
R/W
WDTIME[5]
4
R/W
WDTIME[4]
3
R/W
WDTIME[3]
2
R/W
WDTIME[2]
1
R/W
WDTIME[1]
WDTIME
0
R/W
WDTIME[0]
Table 25. Watchdog Timer Register
ADDRESS = 1Fh
SYMBOL
BIT
R/W
DESCRIPTION
EN_WHDOG
7
R/W
A logic high enables the watchdog function
WD_INT_EN
6
—
Enables interrupt on SMODE_ bits
Reserved
5
—
Reserved
4
R/W
HWMODE4
3
R/W
Port 4 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
HWMODE3
2
R/W
Port 3 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
HWMODE2
1
R/W
Port 2 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
HWMODE1
0
R/W
Port 1 switches to AUTO if logic high and to SHUTDOWN if logic low when watchdog timer expires
Table 26. Switch Mode Register
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相关代理商/技术参数 |
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|---|---|
| MAX5945EAX+ | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr Controller 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 |
| MAX5945EAX+T | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr Controller 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 |
| MAX5945EAX-T | 功能描述:热插拔功率分布 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 |
| MAX5945EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit/Evaluation System for the MAX5945 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5945EVSYS | 功能描述:电源管理IC开发工具 Evaluation Kit/Evaluation System for the MAX5945 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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