參數(shù)資料
型號： ADT7462ACPZ-500RL7
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT
封裝： 5 X 5 MM, LFCSP-32
文件頁數(shù)： 38/88頁
文件大?。?/td> 836K
代理商： ADT7462ACPZ-500RL7
ADT7462
Rev. 2 | Page 43 of 88 | www.onsemi.com
TEMPERATURE ABOVE TMIN
0
20406080
100
120
0
FAN
SPEED
(%
O
F
M
A
X)
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE TMIN
0
20
40
60
80
100
120
0
P
W
M
DUT
Y
CY
CL
E
(
%
)
10
20
30
40
50
60
70
80
90
100
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
05569-
049
Figure 61. TRANGE vs. Actual Fan Speed Profile
TEMPERATURE ABOVE TMIN
0
20
40
60
80
100
120
0
P
W
M
DU
T
Y
CY
CL
E
(%
)
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE TMIN
0
20406080
100
120
0
F
A
N
SPE
ED
(
%
O
F
M
A
X
)
10
20
30
40
50
60
70
80
90
100
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
05569
-0
50
Figure 62. TRANGE and % Fan Speed Slopes with PWMMIN = 20%
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 runs
about 45% fan speed when the temperature exceeds TMIN.
Example: Determining TRANGE for Each Temperature
Channel
The following example shows how the different TMIN and TRANGE
settings can be applied to three different thermal zones. In this
example, the following TRANGE values apply:
TRANGE = 80°C for ambient temperature
TRANGE = 53.3°C for CPU temperature
TRANGE = 40°C for VRM temperature
This example uses the MUX configuration described in the
Step 1—Configuring the MUX section. Both CPU temperature
and VRM temperature drive the CPU fan connected to PWM1.
Ambient temperature drives the front chassis fan and rear
chassis fan connected to PWM2 and PWM3.
The front chassis fan is configured to run at PWMMIN = 20%.
The rear chassis fan is configured to run at PWMMIN = 30%.
The CPU fan is configured to run at PWMMIN = 10%.
Note on 4-Wire Fans
The control range for 4-wire fans is much wider than that of
2-wire or 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20%.
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