参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 41/82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
100%
T RANGE
HYSTERESIS
Dynamic T MIN Control Mode
In addition to the automatic fan speed control mode
described in the Automatic Fan Control Overview section,
the ADT7462 has a mode that extends the basic automatic
fan speed control loop. Dynamic T MIN control allows the
ADT7462 to intelligently adapt the system’s cooling
solution for best system performance or lowest possible
0%
T MIN T THERM
Figure 63. How T THERM Relates to Automatic Fan
Control
Step 7 ? T HYST for Temperature Channels
T HYST is the amount of extra cooling a fan provides after
the temperature measured has dropped back below T MIN
before the fan turns off. The premise for temperature
hysteresis (T HYST ) is that without it, the fan would merely
chatter or cycle on and off regularly whenever the
temperature hovers near the T MIN setting.
The T HYST value chosen determines the amount of time
needed for the system to cool down or heat up as the fan is
turning on and off. Values of hysteresis are programmable in
the range of 1 ? C to 15 ? C. Larger values of T HYST prevent the
fans from chattering on and off. The T HYST default value is
set at 4 ? C.
Hysteresis Register
Register 0x60, Bits [3:0] Local HYS
Register 0x61, Bits [3:0] Remote 1 HYS
Register 0x62, Bits [3:0] Remote 2 HYS
Register 0x63, Bits [3:0] Remote 3 HYS
In some applications, it is required that fans not turn off
below T MIN but remain running at PWM MIN . Bits [1:0] of
the PWM1, PWM2 Frequency Register (0x25) and the
PWM3, PWM4 Frequency Register (0x26) allow the fans to
be turned off or to be kept spinning below T MIN . If the fans
are always on, the T HYST value has no effect on the fan when
the temperature drops below T MIN .
T RANGE
100%
T HYST
system acoustics, depending on user or design requirements.
Use of dynamic T MIN control alleviates the need to design
for worst-case conditions and significantly reduces system
design and validation time.
Designing for Worst-Case Conditions
System design must always allow for worst-case
conditions. In PC design, the worst-case conditions include,
but are not limited to, the following:
? Worst-Case Altitude
A computer can be operated at different altitudes.
Altitude affects the relative air density, which alters the
effectiveness of the fan cooling solution. For example,
when comparing 40 ? C air temperature at 10,000 feet to
20 ? C air temperature at sea level, relative air density is
increased by 40%. This means that the fan can spin
40% slower and make less noise at sea level than at
10,000 feet while keeping the system at the same
temperature at both locations.
? Worst-Case Fan
Due to manufacturing tolerances, fan speeds in rpm are
normally quoted with a tolerance of ? 20%. The
designer must assume that the fan rpm can be 20%
below tolerance. This translates to reduced system
airflow and elevated system temperature. Note that fans
20% out of tolerance can negatively impact system
acoustics because they run faster and generate more
noise.
? Worst-Case Chassis Airflow
The same motherboard can be used in a number of
different chassis configurations. The design of the
chassis and the physical location of fans and
components determine the system’s thermal
characteristics. Moreover, for a given chassis, the
addition of add-in cards, cables, or other system
configuration options can alter the system airflow and
reduce the effectiveness of the system cooling solution.
The cooling solution can also be inadvertently altered
by the end user. (For example, placing a computer
against a wall can block the air ducts and reduce system
airflow.)
0%
T MIN
T THERM
Figure 64. T HYST Value Applies to Fan On/Off
Hysteresis
http://onsemi.com
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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 |
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