参数资料
| 型号： | ADT7467BBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 50/72页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7467 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 传感器类型： | 温度 |
| 传感范围： | -40°C ~ 120°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1.5°C |
| 电源电压： | 3 V ~ 5.5 V |
| 嵌入式： | 否 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | ADT7467 |
| 其它名称： | EVAL-ADT7467EBZ EVAL-ADT7467EBZ-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页当前第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
ADT7467
Enhanced Acoustics Register 2 (0x63)
<2:0> ACOU3 selects the ramp rate for PWM3.
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 sec
101 = 12 sec
110 = 6.4 sec
111 = 3.2 sec
<6:4> ACOU2 selects the ramp rate for PWM2.
000 = 140 sec
001 = 70.4 sec
010 = 47.2 sec
011 = 28 sec
100 = 17.6 sec
101 = 12 sec
110 = 6.4 sec
111 = 3.2 sec
Enhancing System Acoustics
Automatic fan speed control mode reacts instantaneously
immediately responds to temperature change. Any impulses
in temperature can cause an impulse in fan noise. For
psychoacoustic reasons, the ADT7467 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 repeatedly cycling up and down,
annoying the user.
Acoustic Enhancement Mode Overview
Figure 80 shows a top-level overview of the ADT7467
automatic fan control circuitry and where acoustic
enhancement fits in. Acoustic enhancement is intended as a
postdesign tweak made by a system or mechanical engineer
evaluating the 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 and does
not cause user annoyance due to fan cycling. It is important
to realize that although a system may pass an acoustic noise
requirement specification (for example, 36 dB), it fails the
consumer test if the fan is annoying.
to changes in temperature, that is, the PWM duty cycle
ACOUSTIC
ENHANCEMENT
Thermal Calibration
100%
PWM
MIN
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
PWM1
T MIN
100%
REMOTE 2 =
CPU TEMP
0%
T RANGE
Thermal Calibration
MUX
PWM
MIN
Tachometer 1
Measurement
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
TACH1
CPU FAN SINK
PWM2
T MIN
100%
1
23
LOCAL =
VRM TEMP
0%
T RANGE
Thermal Calibration
PWM
MIN
Tachometer 2
Measurement
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
TACH2
FRONT CHASSIS
PWM3
REMOTE 1 =
AMBIENT TEMP
T MIN
0%
T RANGE
Tachometer 3
and 4
Measurement
TACH3
REAR CHASSIS
Figure 80. Acoustic Enhancement Smoothes Fan Speed Variations in Automatic Fan Speed Control
Approaches to System Acoustic Enhancement
There are two different approaches to implementing
system acoustic enhancement: temperature-centric and
fan-centric. The ADT7467 uses the fan-centric approach.
The temperature-centric approach involves smoothing
transient temperatures as they are measured by a
temperature source (for example, Remote 1 temperature).
The temperature values used to calculate the PWM duty
cycle values are smoothed, reducing fan speed variation.
However, this approach causes an inherent delay in updating
fan speed and causes the thermal characteristics of the
system to change. It also causes the system fans to run longer
than necessary, because the fan’s reaction is merely delayed.
The user has no control over noise from different fans driven
by the same temperature source. Consider, for example, a
system in which control of a CPU cooler fan (on PWM1) and
http://onsemi.com
50
相关PDF资料 |
PDF描述 |
|---|---|
| ADT7468ZEVB | BOARD EVAL FOR ADT7468 |
| ADT7473ZEVB | BOARD EVALUATION FOR ADT7473 |
| ADT7475EBZEVB | BOARD EVALUATION FOR ADT7475 |
| ADT7476EBZEVB | BOARD EVALUATION FOR ADT7476 |
| ADT7490ZEVB | BOARD EVALUATION FOR ADT7490 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7468 | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool⑩ Remote Thermal Controller and Voltage Monitor |
| ADT7468ARQ | 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 |
| ADT7468ARQ-REEL | 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 |
| ADT7468ARQ-REEL7 | 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 |
| ADT7468ARQZ | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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 |
发布紧急采购，3分钟左右您将得到回复。