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| 型号： | ADT7468ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 50/81页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTRLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 标准包装： | 2,500 |
| 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 ~ 120°C，外部传感器 |
| 精确度： | ±2°C（最小值） |
| 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 ~ 5.5 V |
| 工作温度： | -40°C ~ 120°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： | 带卷 (TR) |
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ADT7468
Note on 4-Wire Fans
The control range for 4-wire fans is much wider than that of
2-wire or 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20%.
100
90
80
70
60
50
40
30
20
10
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°C.
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
one should ensure that it is not exceeded under normal system
operating conditions.
Note that the T THERM limits are nonmaskable and affect the fan
speed regardless of 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
0
0
10
20
30
40
50
60
70
80
90
100
70°C), can be programmed as T MAX (the temperature at which
100
90
80
70
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TEMPERATURE ABOVE T MIN
the fan reaches full speed) by setting T THERM to that limit (for
example, 70°C).
THERM Registers
Reg. 0x6A, Remote 1 THERM limit = 0xA4 (100°C default)
Reg. 0x6B, Local THERM limit = 0xA4 (100°C default)
Reg. 0x6C, Remote 2 THERM limit = 0xA4 (100°C default)
Hysteresis Registers
Reg. 0x6D, Remote 1, local hysteresis register
<7:4>, Remote 1 temperature hysteresis (4°C default)
0
0
10
20
30 40 50 60 70
TEMPERATURE ABOVE T MIN
80
90
100
<3:0>, Local temperature hysteresis (4°C default)
Figure 67. T RANGE and % Fan Speed Slopes for VRM, Ambient, and
CPU Temperature Channels
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 might be operating beyond its safe
operating limit. When the temperature measured exceeds
T THERM , all fans are driven at 100% PWM duty cycle (full speed)
Reg. 0x6E, Remote 2 Temperature Hysteresis Register
<7:4>, Remote 2 temperature hysteresis (4°C default)
Because each hysteresis setting is four bits, hysteresis values are
programmable from 1°C to 15°C. It is recommended that
hysteresis values never be programmed to 0°C, because this
disables hysteresis. In effect, this would cause the fans to cycle
between normal speed and 100% speed, creating unsettling
acoustic noise.
to provide critical system cooling.
Rev. 3 | Page 50 of 81 | www.onsemi.com
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| ADT7468ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24QSOP 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 |
| ADT7468ARQZ-RL7 | 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 |
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| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
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