参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 33/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页当前第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页
ADT7462
Fan Speed Control
The ADT7462 controls fan speed using two different
modes: automatic and manual.
In automatic fan speed control mode, fan speed is
automatically varied with temperature and without CPU
intervention, after initial parameters are set up. The
advantage of this mode is that if the system hangs, the system
is protected from overheating. The automatic fan speed
control incorporates a feature called dynamic T MIN
calibration. This feature reduces the design effort required
to program the automatic fan speed control loop. For more
information on how to program the automatic fan speed
control loop and dynamic T MIN operation, see the
Programming the Automatic Fan Speed Control Loop
section.
In manual fan speed control mode, the ADT7462 allows
the duty cycle of any PWM output to be manually adjusted.
This is useful if the user wants to change fan speed in the
software or adjust PWM duty cycle output for test purposes.
Bits [7:5] of Register 0x21 to Register 0x24 (PWM
configuration registers) control the behavior of each PWM
output. Under manual control, each PWM output can be
manually updated by writing to Register 0xAA to
Register 0xAD (PWM duty cycle registers).
Programming the PWM Current Duty Cycle Registers
The PWM current duty cycle registers are 8-bit registers
that allow the PWM duty cycle for each output to be set
anywhere from 0% to 100% in steps of 0.39%.
The value to be programmed into the PWM MIN register is
given by:
Value (decimal) = PWM MIN /0.39
Example 1: For a PWM duty cycle of 50%,
Value (decimal) = 50/0.39 = 128 decimal
Value = 128 decimal or 0x80
Example 2: For a PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 decimal
Value = 84 decimal or 0x54
PWM Duty Cycle Registers
Register 0xAA PWM1 Duty Cycle = 0x00 (0% default)
Register 0xAB PWM2 Duty Cycle = 0x00 (0% default)
Register 0xAC PWM3 Duty Cycle = 0x00 (0% default)
Register 0xAD PWM4 Duty Cycle = 0x00 (0% default)
By reading the PWMx current duty cycle registers, the
user can keep track of the current duty cycle on each PWM
output, even when the fans are running in automatic fan
speed control mode or acoustic enhancement mode.
VARY PWM DUTY
CYCLE WITH 8-BIT
RESOLUTION
Figure 50. Control PWM Duty Cycle Manually with a
Resolution of 0.39%
Programming the Automatic Fan Speed Control Loop
Note that to better understand the automatic fan speed
control loop, use of the ADT7462 evaluation board and
software is strongly recommended while reading this
section.
This section provides the system designer with an
understanding of the automatic fan control loop and
provides step-by-step guidance on effectively evaluating
and selecting critical system parameters. To optimize
system characteristics, the designer needs to carefully plan
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 the process.
Automatic Fan Control Overview
The ADT7462 can automatically control the speed of fans
based upon the measured temperature. This is done
independently from CPU intervention once initial parameters
are set up.
The ADT7462 has a local temperature sensor and up to
three remote temperature channels that can be connected to
a CPU on-chip thermal diode (available on Intel Pentium
class and other CPUs/GPUs). These four 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
http://onsemi.com
33
相关PDF资料 |
PDF描述 |
|---|---|
| ADT7467BBZEVB | BOARD EVALUATION FOR ADT7467 |
| ADT7468ZEVB | BOARD EVAL FOR ADT7468 |
| ADT7473ZEVB | BOARD EVALUATION FOR ADT7473 |
| ADT7475EBZEVB | BOARD EVALUATION FOR ADT7475 |
| ADT7476EBZEVB | BOARD EVALUATION FOR ADT7476 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7463 | 制造商:AD 制造商全称:Analog Devices 功能描述:dB COOL Remote Thermal Controller and Voltage Monitor |
| ADT7463ARQ | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 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 |
| ADT7463ARQ-REEL | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 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 |
| ADT7463ARQ-REEL7 | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 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 |
| ADT7463ARQZ | 功能描述:马达/运动/点火控制器和驱动器 SYS MGMT CNTRLR IC 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 |
发布紧急采购，3分钟左右您将得到回复。