参数资料
型号: ADT7475EBZEVB
厂商: ON Semiconductor
文件页数: 35/58页
文件大小: 0K
描述: BOARD EVALUATION FOR ADT7475
产品变化通告: MFG CHG Notification ADI to ON Semi
标准包装: 1
系列: dBCool®
类型: 温度传感器
适用于相关产品: ADT7475
所含物品: 评估板
其它名称: EVAL-ADT7475EB
EVAL-ADT7475EB-ND
ADT7475
T RANGE
T MIN
100%
PWM MIN
0%
TEMPERATURE
Figure 52. T RANGE Parameter Affects Cooling Slope
The T RANGE is determined by the following procedure:
1. Determine the maximum operating temperature for
that channel (for example, 70 ° C).
2. Determine, experimentally, the fan speed (PWM
duty cycle value) that does not exceed the
temperature at the worst-case operating points.
(For example, 70 ° C is reached when the fans are
running at 50% PWM duty cycle.)
3. Determine the slope of the required control loop to
meet these requirements.
4. Using the ADT7475 evaluation software,
graphically program and visualize this
functionality.
As PWM MIN is changed, the automatic fan control slope
also changes.
100%
50%
33%
100%
10%
0%
30 ° C
T MIN ? HYST 40 ° C
45 ° C
54 ° C
T MIN
Figure 54. Increasing T RANGE Changes the AFC Slope
100%
MAX
PWM
10%
0%
T RANGE
T MIN ? HYST
Figure 55. Changing PWM MAX Does Not Change the
AFC Slope
Selecting T RANGE
The T RANGE value can be selected for each temperature
channel: Remote 1, local, and Remote 2 temperatures.
Bits <7:4> (RANGE) of Register 0x5F to Register 0x61
define the T RANGE value for each temperature channel.
Table 43. SELECTING A T RANGE VALUE
0%
Bits <7:4> (Note 1)
0000
T RANGE ( 5 C)
2
T MIN
30 ° C
0001
0010
2.5
3.33
Figure 53. Adjusting PWM MIN Changes the Automatic
Fan Control Slope
As T RANGE is changed, the slope also changes. As
T RANGE gets smaller, the fans reach 100% speed with a
smaller temperature change.
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
4
5
6.67
8
10
13.33
16
20
26.67
32 (Default)
40
53.33
80
1. Register 0x5F configures Remote 1 T RANGE ; Register 0x60
configures local T RANGE ; Register 0x61 configures Remote 2
T RANGE .
http://onsemi.com
35
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