参数资料
型号: ADT7473ZEVB
厂商: ON Semiconductor
文件页数: 39/73页
文件大小: 0K
描述: BOARD EVALUATION FOR ADT7473
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: ADT7473
所含物品: 评估板
其它名称: EVAL-ADT7473EBZ
EVAL-ADT7473EBZ-ND
ADT7473
Example 3
Calculate T MAX , given that T MIN = 30 ? C, T RANGE =
40 ? C, and PWM MIN = 33% duty cycle = 85 (decimal).
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% ? 33%) ? 40 ? C/170
T MAX = 30 ? C + (255 ? 85) ? 40 ? C/170
T MAX = 70 ? C (effective T RANGE = 40 ? C)
Example 4
Calculate T MAX , given that T MIN = 30 ? C, T RANGE =
40 ? C, and PWM MIN = 50% duty cycle = 128 (decimal).
T MAX = T MIN + (Max DC ? Min DC) ? T RANGE /170
T MAX = 30 ? C + (100% ? 50%) ? 40 ? C/170
T MAX = 30 ? C + (255 ? 128) ? 40 ? C/170
T MAX = 60 ? C (effective T RANGE = 30 ? C)
Selecting a T RANGE Slope
The T RANGE value can be selected for each temperature
channel: Remote 1, local, and Remote 2. Bits <7:4>
(T RANGE ) of Register 0x5F to Register 0x61 define the
T RANGE value for each temperature channel.
Table 46. SELECTING A T RANGE VALUE
Increasing or decreasing PWM MIN changes the effective
T RANGE , although the fan control still follows the same
PWM duty cycle to temperature slope. The effective
T RANGE for different PWM MIN values can be calculated
using Equation 7.
T MAX + T MIN ) Max DC * Min DC T TRANGE 170
(eq. 7)
where (Max DC ? Min DC) ? T RANGE /170 is the effective
T RANGE value.
See the Note on Fan Speed and PWM Duty Cycle section.
Figure 59 shows PWM duty cycle vs. temperature for each
T RANGE setting. The lower graph shows how each T RANGE
setting affects fan speed vs. temperature. As indicated by the
graph, the effect on fan speed is nonlinear.
The graphs in Figure 59 assume the fan starts from 0%
PWM duty cycle. Clearly, the minimum PWM duty cycle,
PWM MIN , needs to be factored in to see how the loop
actually performs in the system. Figure 60 shows how
T RANGE is affected when the PWM MIN value is set to 20%.
It can be seen that the fan actually runs at about 45% fan
speed when the temperature exceeds T MIN .
Bits <7:4> (Note 1)
0000
0001
0010
0011
0100
0101
0110
0111
1000
T RANGE ( 5 C)
2
2.5
3.33
4
5
6.67
8
10
13.33
100
90
80
70
60
50
40
30
20
10
2 5 C
2.5 5 C
3.33 5 C
4 5 C
5 5 C
6.67 5 C
8 5 C
10 5 C
13.3 5 C
16 5 C
20 5 C
26.6 5 C
32 5 C
4 0 5 C
53.3 5 C
1001 16
1010 20
1011 26.67
1100 32 (Default)
1101 40
1110 53.33
1111 80
1. Register 0x5F configures Remote 1 T RANGE ; Register 0x60
configures local T RANGE ; Register 0x61 configures Remote 2
T RANGE .
0
100
90
80
70
60
50
40
0
20
40 60 80 100
TEMPERATURE ABOVE T MIN
120
80 5 C
2 5 C
2.5 5 C
3.33 5 C
4 5 C
5 5 C
6.67 5 C
8 5 C
10 5 C
13.3 5 C
16 5 C
30
10
Summary of T RANGE Function
When using the automatic fan control function, the
temperature at which the fan reaches full speed can be
calculated by:
T MAX + T MIN ) T TRANGE (eq. 6)
Equation 6 holds true only when PWM MIN is equal to
33% PWM duty cycle.
20 5 C
26.6 5 C
20 32 5 C
4 0 5 C
53.3 5 C
0 80 5 C
0 20 40 60 80 100 120
TEMPERATURE ABOVE T MIN
Figure 59. T RANGE vs. Actual Fan Speed Profile
http://onsemi.com
39
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