参数资料
| 型号： | ADT7475EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 36/58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 |
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ADT7475
Actual Changes in PWM Output
(Advanced Acoustics Settings)
While the automatic fan control algorithm describes the
general response of the PWM output, the enhanced acoustics
registers (0x62 and 0x63) can be used to set/clamp the
100
90
80
70
2 5 C
2.5 5 C
3.33 5 C
4 5 C
5 5 C
6.67 5 C
maximum rate of change of PWM output for a given
temperature zone. This means if T RANGE is programmed
with a steep AFC slope, a relatively small change in
temperature can cause a large change in PWM output and an
audible change in fan speed, which may be noticeable/
annoying to users. Decreasing the PWM output’s maximum
rate of change, by programming the smoothing on the
appropriate temperature channels (Register 0x62 and
Register 0x63), clamps the fan speed’s maximum rate of
change in the event of a temperature spike. The PWM duty
60
50
40
30
20
10
0
0
20
40 60 80 100
TEMPERATURE ABOVE T MIN
120
8 5 C
10 5 C
13.3 5 C
16 5 C
20 5 C
26.6 5 C
32 5 C
40 5 C
53.3 5 C
80 5 C
cycle increases slowly until the PWM duty cycle reaches the
appropriate duty cycle as defined by the AFC curve.
Figure 56 shows PWM duty cycle versus temperature for
each T RANGE setting. The lower graph shows how each
T RANGE setting affects fan speed vs. temperature. As can be
seen from the graph, the effect on fan speed is non-linear.
100
90
80
70
60
2 5 C
2.5 5 C
3.33 5 C
4 5 C
5 5 C
6.67 5 C
8 5 C
100
90
80
70
60
50
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
50
40
30
20
10
0
0
20
40
60
80
100
120
10 5 C
13.3 5 C
16 5 C
20 5 C
26.6 5 C
32 5 C
40 5 C
53.3 5 C
80 5 C
40
30
20
10
16 5 C
20 5 C
26.6 5 C
32 5 C
4 0 5 C
53.3 5 C
TEMPERATURE ABOVE T MIN
Figure 57. T RANGE and % Fan Speed Slopes with
PWM MIN = 20%
The graphs in Figure 56 assume that the fan starts from
0
100
90
80
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
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 57 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 .
50
30
10
5 5 C
70
6.67 5 C
60 8 5 C
10 5 C
13.3 5 C
40 16 5 C
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 56. T RANGE vs. Actual Fan Speed (not PWM
Drive) Profile
Example: Determining T RANGE for Each Temperature
Channel
The following example shows how the different T MIN and
T RANGE settings can be applied to three different thermal
zones. In this example, the following T RANGE values apply:
T RANGE = 80 ° C for ambient temperature
T RANGE = 53.33 ° C for CPU temperature
T RANGE = 40 ° C for VRM temperature
This example uses the mux configuration described in
Step 2: Configuring the Mux, with the ADT7475 connected
as shown in Figure 47. Both CPU temperature and VRM
http://onsemi.com
36
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| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 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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