参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 46/82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 |
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ADT7462
Bit 0 (Remote 1 En) = 1 enables dynamic T MIN control on
the Remote 1 temperature channel. The chosen T MIN value
is dynamically adjusted based on the current temperature,
operating point, and high and low limits for this zone.
Bit 0 (Remote 1 En) = 0 disables dynamic T MIN control.
The T MIN value chosen is not adjusted, and the channel
behaves as described in the Automatic Fan Control
Overview section.
Step 10 ? Monitoring THERM
Using the operating point limit ensures that the dynamic
T MIN control mode is operating in the best possible acoustic
position, while ensuring that the temperature never exceeds
the maximum operating temperature. Using the operating
point limit allows T MIN to be independent of system-level
issues because of its self-corrective nature. In PC design, the
operating point for the chassis is usually the worst-case
internal chassis temperature.
The optimal operating point for the processor is
determined by monitoring the thermal monitor in the Intel
Pentium ? 4 processor. To do this, the PROCHOT output of
the Pentium ? 4 is connected to the THERM input of the
ADT7462.
The operating point for the processor can be determined
by allowing the current temperature to be copied to the
operating point register when the PROCHOT output pulls
the THERM input low on the ADT7462. This gives the
maximum temperature at which the Pentium ? 4 can run
before clock modulation occurs.
Enabling the THERM Trip Point as the Operating Point
Bits [5:2] of Dynamic T MIN Control Register 1 (0x0B)
enable/disable THERM monitoring to program the
temperatures can be copied into the operating point registers
on a THERM assertion. Setting these bits to 1 uses the
remote temperature as the operating point temperature,
overwriting the programmed operating point value in the
event of a THERM assertion. Setting these bits to 0 ignores
a THERM assertion, and the operating point register
remains at the programmed value.
Enhancing System Acoustics
Automatic fan speed control mode reacts instantaneously
to changes in temperature; that is, the PWM duty cycle
responds immediately to temperature change. Any impulses
in temperature can cause an impulse in fan noise. For
psycho-acoustic reasons, the ADT7462 can prevent the
PWM output from reacting instantaneously to temperature
changes. Enhanced acoustic mode controls the maximum
change in PWM duty cycle at a given time. The objective is
to prevent the fan from cycling up and down, annoying the
user.
Acoustic Enhancement Mode Overview
Figure 74 gives a top-level overview of the automatic fan
control circuitry on the ADT7462 and shows where acoustic
enhancement fits in. Acoustic enhancement is intended as a
post-design tweak made by a system or mechanical engineer
evaluating best settings for the system. Having determined
the optimal settings for the thermal solution, the engineer
can adjust the system acoustics. The goal is to implement a
system that is acoustically pleasing without causing user
annoyance due to fan cycling. It is important to realize that
although a system might pass an acoustic noise requirement
specification (for example, 36 dB), if the fan is annoying, it
fails the consumer test.
operating point. Table 43 details how the remote
ACOUSTIC
ENHANCEMENT
THERMAL CALIBRATION
100%
PWM
MIN
PWM
CONFIG
RAMP
S
CONTROL
(ACOUSTIC
PWM
GENERATOR
PWM1
ENHANCEMENT)
REMOTE2 =
CPU TEMP
T MIN T RANGE
THERMAL CALIBRATION
0%
100%
PWM
MIN
TACHOMETER1
MEASUREMENT
RAMP
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM2
T MIN
T RANGE
0%
PWM
TACHOMETER2
MEASUREMENT
PWM
TACH2
LOCAL =
VRM TEMP
THERMAL CALIBRATION
100%
MIN
RAMP
CONFIG
FRONT CAHSSIS
S
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
PWM3
T MIN
T RANGE
0%
TACHOMETER3
AND 4
MEASUREMENT
TACH3
REMOTE1 =
AMBIENT TEMP
Figure 74. Acoustic Enhancement Smoothes Fan Speed Variations
Under Automatic Fan Speed Control
http://onsemi.com
46
REAR CAHSSIS
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相关代理商/技术参数 |
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| 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 |
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