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| 型号： | MAX34441ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 47/53页 |
| 文件大小： | 0K |
| 描述： | IC PS MANAGER PMBUS 5CH 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 应用： | 基站网络线路卡，服务器 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 2.5mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
| 其它名称： | 90-34441+TTR |
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PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
Table_32._MFR_FAN_CONFIG_(continued)
BIT
BIT_NAME
MEANING
The RAMP bits select how fast the device ramps the PWM from one duty cycle to another (either up
or down). In PWM mode, the following table always applies. In RPM mode, the fan speed is read
either every 200ms or 1000ms and when the reported fan speed is within 20% of the target speed,
the maximum allowed PWM duty cycle change is set to 1%. In RPM mode, the PWM duty cycle is
not changed as long as the fan is within Q 5% of the target speed.
7:5
RAMP[2:0]
RAMP2
0
0
0
0
1
1
1
1
RAMP1
0
0
1
1
0
0
1
1
RAMP0
0
1
0
1
0
1
0
1
PWM_DUTY_
CYCLE_UPDATE_
RATE_(ms)
1000
1000
1000
200
200
200
200
200
MAX_PWM_DUTY_
CYCLE_CHANGE_
ALLOWED_(%)
1
2
3
1
2
3
4
5
TIME_TO_RAMP_
FROM_40%_TO_
100%_PWM_DUTY_
CYCLE_(seconds)
60
30
20
12
6
4
3
2.4
4
3
0
ROTOR_HI_LO
This bit always returns a 0.
Determines if a locked rotor indication is active low or active high. This bit is ignored if
ROTOR = 0.
0 = ROTOR is active low (TACH input is low if the rotor stops).
1 = ROTOR is active high (TACH input is high if the rotor stops).
The ROTOR bit selects if the fan does not have a tachometer but rather a stalled (or locked)
rotor output.
ROTOR
FAN_OUTPUT
MAX34441_CONFIGURATION
2
ROTOR
0
1
Tachometer
Stalled/locked rotor
detect
TACH input expects fan RPM
TACH input expects locked rotor signal. The polarity is
selected with the ROTOR_HI_LO bit (also set
MFR_FAN_FAULT_LIMIT = 0001h).
The SPIN bits determine how the device spins up (or starts) the fan from a dead stop. To over-
come the initial mechanical fan inertia, the device can be programmed to drive the fan at 100%
duty cycle until a programmable number of fan revolutions (cumulative count) is detected or a
locked rotor signal is negated. The device allows a 2s startup period during which the fan speed
monitors are disabled. If after 2s the fan does not respond, the PWM output remains at 100%
1:0
SPIN[1:0]
duty cycle (if TACHO = 0) or goes to 0% duty cycle (if TACHO = 1).
SPIN1
0
0
1
1
SPIN0
0
1
0
1
SPIN-UP_RELAXATION_CRITERIA
Automatic spin-up disabled
Two revolutions or locked rotor negated
Four revolutions o r locked rotor negated
Eight revolutions or locke d rotor negated
Note: It is recommended that the fan be disabled prior to changing MFR_FAN_CONFIG.
47
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX34441EVKIT# | 功能描述:电源管理IC开发工具 MAX34441 Eval Kit 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 |
| MAX34446ETL+ | 功能描述:监控电路 PMBus Power Supply Data Logger RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX34446ETL+T | 功能描述:监控电路 PMBus Power Supply Data Logger RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX34446EVKIT# | 功能描述:监控电路 MAX34446 Eval Kit RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX3444EAPA | 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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