參數(shù)資料
型號： ADT7476ARQZ-REEL7
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝： ROHS COMPLIANT, MO-137AE, QSOP-24
文件頁數(shù)： 42/72頁
文件大?。?/td> 5219K
代理商： ADT7476ARQZ-REEL7
ADT7476
Rev. B | Page 47 of 72
Table 17. Selecting a TRANGE Value
Bits [7:4]1
TRANGE (°C)
0000
2
0001
2.5
0010
3.33
0011
4
0100
5
0101
6.67
0110
8
0111
10
1000
13.33
1001
16
1010
20
1011
26.67
1100
32 (default)
1101
40
1110
53.33
1111
80
1 Register 0x5F configures Remote 1 TRANGE; Register 0x60 configures local
TRANGE; Register 0x61 configures Remote 2 TRANGE.
Actual Changes in PWM Output (Advanced Acoustics
Settings)
While the automatic fan control algorithm describes the general
response of the PWM output, it is also necessary to note that
the enhanced acoustics registers (0x62 and 0x63) can be used to
set/clamp the maximum rate of change of PWM output for a
given temperature zone. This means that if TRANGE is program-
med with an AFC slope that is quite steep, a relatively small
change in temperature can cause a large change in PWM output
and possibly an audible change in fan speed, which can be
noticeable/annoying to users.
Decreasing the speed of the PWM output changes, by program-
ming the smoothing on the appropriate temperature channels
(Register 0x62 and Register 0x63), changes how fast the fan
speed increases/decreases in the event of a temperature spike.
The PWM duty cycle increases until the PWM duty cycle
reaches the appropriate duty cycle as defined by the AFC curve.
Figure 61 shows PWM duty cycle vs. temperature for each
TRANGE setting. The lower graph (B) shows how each TRANGE
setting affects fan speed vs. temperature. As can be seen from
the graph, the effect on fan speed is nonlinear.
TEMPERATURE ABOVE TMIN
0
2040
6080
100
120
0
F
AN
S
P
E
D
(
%
O
F
M
AX
)
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE TMIN
(B)
(A)
0
20406080
100
120
0
P
W
M
DUT
Y
CY
CL
E
(
%
)
10
20
30
40
50
60
70
80
90
100
05
38
2-
06
2
2°C
80°C
53.3°C
40°C
32°C
26.6°C
20°C
16°C
13.3°C
10°C
8°C
6.67°C
5°C
4°C
3.33°C
2.5°C
2°C
80°C
53.3°C
40°C
32°C
26.6°C
20°C
16°C
13.3°C
10°C
8°C
6.67°C
5°C
4°C
3.33°C
2.5°C
Figure 61. TRANGE vs. Actual Fan Speed (Not PWM Drive) Profile
The graphs in Figure 61 assume that the fan starts from 0%
PWM duty cycle. Clearly, the minimum PWM duty cycle,
PWMMIN, needs to be factored in to see how the loop actually
performs in the system. Figure 62 shows how TRANGE is affected
when the PWMMIN value is set to 20%. It can be seen that the
fan actually runs at about 45% fan speed when the temperature
exceeds TMIN.
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