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| 型号： | MAX34441ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/53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
MAX34441_I 2 C_
particular fault. Table 5 illustrates the required con-
ditions and fault actions for specific parameters.
System Watchdog Timer
The device uses an internal watchdog timer that is inter-
nally reset every 5ms. In the event that the device is
locked up and this watchdog reset does not occur after
500ms, the device automatically resets. After the reset
occurs, the device reloads all configuration values that
Table_6._DS75LV_Address_Pin_
Configurations
DS75LV_ADDRESS_PIN_
PAGE CONFIGURATION
TEMP_SENSOR
A2 A1 A0
7 TEMP SENSOR I 2 C 0 0 0 0
8 TEMP SENSOR I 2 C 1 0 0 1
were stored to flash and begins normal operation. After
the reset, the device also does the following:
9
10
TEMP SENSOR I 2 C 2
TEMP SENSOR I 2 C 3
0
0
1
1
0
1
1) Sets the NONE OF THE ABOVE bit in STATUS_BYTE.
2) Sets the NONE OF THE ABOVE and MFR bits in
STATUS_WORD.
3) Sets the WATCHDOG bit in STATUS_MFR_SPECIFIC.
4) Notifies the host through ALERT assertion (if enabled
in MFR_MODE).
Temperature Sensor Operation
The device can monitor up to six different temperature
sensors. It can monitor up to four remote I 2 C-based tem-
perature sensors plus a remote diode and its own internal
temperature sensor. Each of the enabled temperature
sensors is measured once a second. The remote diode
and internal temperature sensors are averaged four
times to reduce the affect of noise. Each time the device
attempts to read a temperature sensor it checks for
faults. For the remote diode, a fault is defined as reading
greater than +160 N C or less than -60 N C. For the internal
temperature sensor, a fault is defined as reading greater
than +130 N C or less than -60 N C. For the I 2 C temperature
sensors, a fault is defined as a communication access
failure. Temperature sensor faults are reported by set-
ting the temperature reading to 7FFFh. A temperature
sensor fault results in the setting of the TEMPERATURE
bit in STATUS_BYTE and STATUS_WORD and ALERT is
asserted (if enabled in MFR_MODE). No bits are set in
STATUS_MFR_SPECIFIC.
The temperatures do not have to be used to control the
fan speed. They can be enabled and used for tempera-
ture monitoring only. Reading disabled temperature sen-
sors returns a fixed value of 0000h.
The remote diode temperature sensor can support either
npn or pnp transistors. The device automatically cancels
the series resistance that can affect remote diodes that
are located far from the device.
The device can control up to four DS75LV digital temper-
ature sensors. The A0, A1, and A2 pins on the DS75LV
22
should be configured as shown in Table 6. The thermo-
stat function on the DS75LV is not used and thus the O.S.
output should be left open circuit.
Fan Control Operation
Fan control has four operational modes. The mode is
determined by the combination of FAN_COMMAND_1
and bit 6 of FAN_CONFIG_1_2 (see Table 7). Fan control
can be disabled by setting bit 7 in FAN_CONFIG_1_2 to
zero.
Dual Fan Applications
In dual fan applications operating in RPM mode, the
tachometer selected when TACHSEL = 0 is close-
loop-controlled to the target RPM. Once PWM ramp-
ing is complete, TACHSEL toggles between the two
tachometers every 500ms for monitoring purposes. The
slower of the two tachometer signals is reported by
READ_FAN_SPEED_1 and is used as a comparison for
fan faults and warning. In dual fan applications operating
in PWM mode, TACHSEL always switches every 500ms.
If one of the two tachometer signals operate at a slower
speed, it is recommended that the slower tachometer be
presented to the TACH input when TACHSEL = 0.
Automatic Fan Control Operation
In the automatic mode, the fan is controlled in a closed
loop based on the controlling temperature (the highest
postnormalized temperature reading) and the associ-
ated fan control PWM duty cycle (in %) or fan speed
(in RPM). These parameters are assigned in the fan
lookup table (LUT). See the MFR_FAN_LUT description
for configuration details. When a controlling temperature
exceeds the temperature level programmed in the LUT,
the device outputs a PWM duty cycle or adjusts the fan
speed, associated with that temperature. See Figure 1
for an example.
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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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