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| 型号： | ADT7476AARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 41/66页 |
| 文件大小： | 945K |
| 描述： | IC REMOTE THERM CTRLR 5V 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 56 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±2.5% |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1118 (CN2011-ZH PDF) |
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ADT7476A
http://onsemi.com
41
Figure 62. T
RANGE
and % Fan Speed Slopes with
PWM
MIN
= 20%
25C
805C
53.35C
405C
325C
26.65C
205C
165C
13.35C
105C
85C
6.675C
55C
45C
3.335C
2.55C
25C
805C
53.35C
405C
325C
26.65C
205C
165C
13.35C
105C
85C
6.675C
55C
45C
3.335C
2.55C
TEMPERATURE ABOVE T
MIN
0
0
20
40
60
80
100
120
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE T
MIN
0
0
20
40
60
80
100
120
10
20
30
40
50
60
70
80
90
100
Example: Determining T
RANGE
for Each Temperature
Channel
The following example shows how the different T
MIN
and
T
RANGE
settings can be applied to three different thermal
zones. In this example, the following T
RANGE
values apply:
T
RANGE
= 80癈 for ambient temperature
T
RANGE
= 53.33癈 for CPU temperature
T
RANGE
= 40癈 for VRM temperature
This example uses the mux configuration described in
Step 2 - Configuring the Mux with the ADT7476A
connected as shown in Figure 52. Both CPU temperature
and VRM temperature drive the CPU fan connected to
PWM1. Ambient temperature drives the front chassis fan
and rear chassis fan connected to PWM2 and PWM3. The
front chassis fan is configured to run at PWM
MIN
= 20%.
The rear chassis fan is configured to run at PWM
MIN
= 30%.
The CPU fan is configured to run at PWM
MIN
= 10%.
Note: The control range for 4-wire fans is much wider than
that of 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20% or less. In extreme cases,
some 3-wire fans cannot run unless a PWM drive of 60% or
more is applied.
Figure 63. T
RANGE
and % Fan Speed Slopes for VRM,
Ambient, and CPU Temperature Channels
TEMPERATURE ABOVE T
MIN
0
0
10 20 30 40 50 60 70 80 90 100
10
20
30
40
50
60
70
80
90
100
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
TEMPERATURE ABOVE T
MIN
0
0
10 20 30 40 50 60 70 80 90 100
10
20
30
40
50
60
70
80
90
100
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
Step 7 T
THERM
for Temperature Channels
T
THERM
is the absolute maximum temperature allowed
on a temperature channel. Above this temperature, a
component such as the CPU or VRM can operate beyond its
safe operating limit. When the temperature measured
exceeds T
THERM
, all fans are driven at 100% PWM duty
cycle (full speed) to provide critical system cooling.
The fans remain running at 100% until the temperature
drops below T
THERM
minus hysteresis, where hysteresis is
the number programmed into the hysteresis registers (0x6D
and 0x6E). The default hysteresis value is 4癈.
The T
THERM
limit should be considered the maximum
worst-case operating temperature of the system. Because
exceeding any T
THERM
limit runs all fans at 100%, it has
very negative acoustic effects. Ultimately, this limit should
be set up as a fail-safe, and users should ensure that it is not
exceeded under normal system operating conditions.
Note: T
THERM
limits are nonmaskable and affect the fan
speed no matter how automatic fan control settings are
configured. This allows some flexibility, because a T
RANGE
value can be selected based on its slope, while a hard limit
(such as 70癈), can be programmed as T
MAX
(the
temperature at which the fan reaches full speed) by setting
T
THERM
to that limit (for example, 70癈).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADT7476AARQZ-REEL7 | 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 |
| ADT7476AARQZ-RL7 | 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 |
| ADT7476ARQH | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
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