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| 型号： | ADT7473ARQZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 48/73页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTLR 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
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ADT7473
Figure 72 shows how T MIN increases when the current
temperature is above T MIN and below the low temperature
limit, and T MIN is below the high temperature limit and
below the operating point. Once the temperature rises above
the low temperature limit, T MIN stays the same.
THERM
LIMIT
HIGH TEMP
LIMIT
the Pentium ? 4 is connected to the THERM input of the
ADT7473/ADT7473 ? 1.
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 ADT7473/ADT7473 ? 1. This
gives the maximum temperature at which the Pentium ? 4
can run before clock modulation occurs.
OPERATING
POINT
LOW TEMP
LIMIT
HYSTERESIS
ACTUAL
TEMP
Enabling the THERM Trip Point as the Operating Point
Bits <4:2> of Dynamic T MIN Control Register 1 (0x36)
enable/disable THERM monitoring to program the
operating point.
T MIN
Figure 72. Increasing T MIN for Quieter Operation
Example 4: Preventing T MIN from Reaching Full Scale
Because T MIN is dynamically adjusted, it is undesirable
for T MIN to reach full scale (127 ? C) because the fan would
never switch on. As a result, T MIN is allowed to vary only
within a specified range:
? The lowest possible value for T MIN is ? 127 ? C (twos
complement mode) or ? 64 ? C (Offset 64 mode).
? T MIN cannot exceed the high temperature limit.
? If the temperature is below T MIN , the fan is switched
off or runs at minimum speed and dynamic T MIN
control is disabled.
THERM
LIMIT
Dynamic T MIN Control Register 1 (0x36)
Bit <4> PHTR2 = 1, copies the Remote 2 current
temperature to the Remote 2 operating point register, if
THERM is asserted. The operating point contains the
temperature at which THERM is asserted. This allows the
system to run as quietly as possible without affecting system
performance.
PHTR2 = 0, ignores any THERM assertions. The Remote 2
operating point register reflects its programmed value.
Bit <3> PHTL = 1, copies the local current temperature to
the local temperature operating point register if THERM is
asserted. The operating point contains the temperature at
which THERM is asserted. This allows the system to run as
quietly as possible without affecting system performance.
PHTL = 0, ignores any THERM assertions. The local
temperature operating point register reflects its programmed
value.
OPERATING
POINT
LOW TEMP
LIMIT
HIGH TEMP
LIMIT
T MIN
HYSTERESIS
ACTUAL
TEMP
T MIN PREVENTED
FROM INCREASING
Bit <2> PHTR1 = 1, copies the Remote 1 current
temperature to the Remote 1 operating point register if
THERM is asserted. The operating point contains the
temperature at which THERM is asserted. This allows the
system to run as quietly as possible without affecting system
performance.
PHTR1 = 0, ignores any THERM assertions. The Remote 1
operating point register reflects its programmed value.
Figure 73. T MIN Adjustments Limited by the High
Temperature Limit
Step 11: Monitoring THERM
Using the operating point limit ensures that the dynamic
T MIN control mode operates 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
Enabling Dynamic T MIN Control Mode
Bits <7:5> of the Dynamic T MIN Control Register 1 (0x36)
enable/disable dynamic T MIN control on the temperature
channels.
Dynamic TMIN Control Register 1 (0x36)
Bit <7> R2T = 1, enables dynamic T MIN control on the
Remote 2 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.
R2T = 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.
http://onsemi.com
48
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7473EBZEVB | 功能描述:EVALUATION BOARD ADT7473 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
| ADT7473ZEVB | 功能描述:BOARD EVALUATION FOR ADT7473 RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:dBCool® 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7475 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Monitor and Fan Controller |
| ADT7475_1110 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dbCOOL Remote Thermal Monitor and Fan Controller |
| ADT7475ARQZ | 功能描述:马达/运动/点火控制器和驱动器 MLTCH TDM FAN CTRLR 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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