参数资料
| 型号： | ADT7468ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 39/81页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADT7468 |
| 标准包装： | 1 |
| 其它名称： | EVAL-ADT7468EB EVAL-ADT7468EB-ND |
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ADT7468
Dynamic T MIN Control Overview
Dynamic T MIN control mode builds upon the basic automatic
fan control loop by adjusting the T MIN value based on system
performance and measured temperature. This is important,
because, instead of designing for the worst case, the system
thermals can be defined as operating zones. ADT7468 can self-
adjust its fan control loop to maintain either an operating zone
temperature or a system target temperature. For example, one
can specify that the ambient temperature in a system should be
maintained at 50°C. If the temperature is below 50°C, the fans
Figure 52 shows an overview of the parameters that affect the
operation of the dynamic T MIN control loop.
TEMPERATURE
might not need to run or might run very slowly. If the
T LOW
T MIN OPERATING T HIGH T THERM T RANGE
POINT
temperature is higher than 50°C, the fans need to throttle up.
Figure 52. Dynamic T MIN Control Loop
The challenge presented by any thermal design is finding the
right settings to suit the system’s fan control solution. This can
involve designing for the worst case, followed by weeks of
Table 14 provides a brief description of each parameter.
Table 14. T MIN Control Loop Parameters
system thermal characterization, and finally fan acoustic
optimization (for psycho-acoustic reasons). Getting the most
benefit from the automatic fan control mode involves character-
izing the system to find the best T MIN and T RANGE settings for the
control loop, and the best PWM MIN value for the quietest fan
speed setting. Using the ADT7468’s dynamic T MIN control
mode, however, shortens the characterization time and
alleviates tweaking the control loop settings, because the device
can self-adjust during system operation.
Dynamic T MIN control mode is operated by specifying the
operating zone temperatures required for the system.
Associated with this control mode are three operating point
registers, one for each temperature channel. This allows the
system thermal solution to be broken down into distinct
thermal zones. For example, CPU operating temperature is
70°C, VRM operating temperature is 80°C, and ambient
operating temperature is 50°C. The ADT7468 dynamically
Parameter
T LOW
T HIGH
T MIN
Operating
point
T THERM
T RANGE
Description
If the temperature drops below the T LOW limit, an
error flag i s set in a status register and an
SMBALERT interrupt can be generated.
If the temperature exceeds the T HIGH limit, an
error flag i s set in a status register and an
SMBALERT interrupt can be generated.
The temperature at which the fan turns on
under automatic fan speed control.
The target temperature for a particular
temperature zone. The ADT7468 attempts to
maintain system temperature at about the
operating point by adjusting the T MIN parameter
of the control loop.
If the temperature exceeds this critical limit, the
fans can be run at 100% for maximum cooling.
Programs the PWM duty cycle vs. temperature
control slope.
alters the control solution to maintain each zone temperature as
closely as possible to its target operating point.
Operating Point Registers
Reg. 0x33, Remote 1 operating point = 0xA4 (100°C default)
Dynamic T MIN Control Programming
Because the dynamic T MIN control mode is a basic extension of
the automatic fan control mode, program the automatic fan
control mode parameters first, as described in Step 1 to Step 8,
then proceed with dynamic T MIN control mode programming.
Reg. 0x34, local operating point = 0xA4 (100°C default)
Reg. 0x35, Remote 2 operating point = 0xA4 (100°C default)
Rev. 3 | Page 39 of 81 | www.onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
| ADT7470_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
| ADT7470ARQ | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (I2C) 16-Pin QSOP |
| ADT7470ARQ-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADT7470ARQ-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (I2C) 16-Pin QSOP T/R |
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