参数资料
| 型号： | ADT7475EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 28/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7475 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7475 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7475EB EVAL-ADT7475EB-ND |
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ADT7475
and selecting critical system parameters. To optimize the
system characteristics, the designer needs to give some
thought to system configuration, including the number of
fans, where they are located, and what temperatures are
being measured in the particular system.
The mechanical or thermal engineer who is tasked with
the system thermal characterization should also be involved
at the beginning of this process.
Automatic Fan Control Overview
The ADT7475 can automatically control the speed of fans
based upon the measured temperature. This is done
independently of CPU intervention once initial parameters
are set up.
The ADT7475 has a local temperature sensor and two
remote temperature channels that can be connected to a CPU
on-chip thermal diode (available on Intel ? Pentium ? class
and other CPUs). These three temperature channels can be
used as the basis for automatic fan speed control to drive fans
using pulse-width modulation (PWM).
Automatic fan speed control reduces acoustic noise by
optimizing fan speed according to accurately measured
temperature. Reducing fan speed can also decrease system
current consumption.
The automatic fan speed control mode is very flexible
owing to the number of programmable parameters,
including T MIN and T RANGE . The T MIN and T RANGE values
for a temperature channel, and, therefore, for a given fan are
critical because they define the thermal characteristics of the
system. The thermal validation of the system is one of the
most important steps in the design process, so select these
values carefully.
Figure 42 gives a top-level overview of the automatic fan
control circuitry on the ADT7475. From a systems level
perspective, up to three system temperatures can be
monitored and used to control three PWM outputs. The three
PWM outputs can be used to control up to four fans. The
ADT7475 allows the speed of four fans to be monitored.
Each temperature channel has a thermal calibration block,
allowing the designer to individually configure the thermal
characteristics of each temperature channel.
For example, the designer can decide to run the CPU fan
when CPU temperature increases above 60 ° C and a chassis
fan when the local temperature increases above 45 ° C. At this
stage, the designer has not assigned these thermal calibration
settings to a particular fan drive (PWM) channel. The right
side of Figure 42 shows controls that are fan-specific. The
designer has individual control over parameters such as
minimum PWM duty cycle, fan speed failure thresholds,
and even ramp control of the PWM outputs. Automatic fan
control, then, ultimately allows graceful fan speed changes
that are less perceptible to the system user.
THERMAL CALIBRATION
100%
PWM
MIN
S
PWM
CONFIG
PWM
GENERATOR
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM1
REMOTE1
TEMP
LOCAL
TEMP
T MIN T RANGE
THERMAL CALIBRATION
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
0%
100%
MUX
PWM
MIN
S
PWM
MIN
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
RAMP
TACH1
PWM2
TACH2
S
PWM
GENERATOR
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM3
REMOTE2
TEMP
T MIN
T RANGE
0%
TACHOMETER 3
AND 4
MEASUREMENT
TACH3
Figure 42. Automatic Fan Control Block Diagram
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7476 | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7476A | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7476AARQZ | 功能描述:马达/运动/点火控制器和驱动器 MONITORS 5V/4 FANS RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7476AARQZ-R | 功能描述:板上安装温度传感器 MONITORS 5V/4 FANS RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
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