參數(shù)資料
型號： ADM1031ARQZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, MO-137AB, QSOP-16
文件頁數(shù)： 7/36頁
文件大?。?/td> 596K
代理商： ADM1031ARQZ-REEL
ADM1031
Rev. B | Page 15 of 36
FAN CONTROL MODES OF OPERATION
The ADM1031 has four different modes of operation. These
modes determine the behavior of the system.
1.
Automatic Fan Speed Control Mode.
2.
Filtered Automatic Fan Speed Control Mode.
3.
PWM Duty Cycle Select Mode (directly sets fan speed
under software control).
4.
RPM Feedback Mode.
AUTOMATIC FAN SPEED CONTROL
The ADM1031 has a local temperature channel and two remote
temperature channels, which can be connected to an on-chip
diode-connected transistor on a CPU. These three temperature
channels can be used as the basis for an automatic fan speed
control loop to drive fans using pulse width modulation
(PWM).
How Does the Control Loop Work?
The automatic fan speed control loop is shown in Figure 22.
MAX
FAN
SPEED
MIN
TEMPERATURE
TMIN
TMAX = TMIN + TRANGE
SPIN-UP FOR SECONDS
02402-022
Figure 22. Automatic Fan Speed Control Loop
TMIN is the temperature at which the fan should switch on and run
at minimum speed. The fan only turns on once the temperature
being measured rises above the TMIN value programmed. The
fan spins up for a predetermined time (default = 2 seconds). See
the Fan Spin-Up section for more details.
TRANGE is the temperature range over which the ADM1031
automatically adjusts the fan speed. As the temperature
increases beyond TMIN, the PWM_OUT duty cycle increases
accordingly. The TRANGE parameter actually defines the fan
speed vs. temperature slope of the control loop.
TMAX is the temperature at which the fan is at its maximum
speed. At this temperature, the PWM duty cycle driving the fan
is 100%. TMAX is given by TMIN + TRANGE. Since this parameter is
the sum of the TMIN and TRANGE parameters, it does not need to
be programmed into a register on-chip.
A hysteresis value of 5°C is included in the control loop
to prevent the fan continuously switching on and off if the
temperature is close to TMIN. The fan continues to run until
the temperature drops 5°C below TMIN.
Figure 23 shows the different control slopes determined by the
TRANGE value chosen, and programmed into the ADM1031. TMIN
is set to 0°C to start all slopes from the same point. The figure
shows how changing the TRANGE value affects the PWM duty
cycle vs. temperature slope.
TEMPERATURE (
°C)
P
W
M
DUTY
CY
CLE
(%)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
510
20
40
60
80
TMAX = TMIN + TRANGE
T R
AN
G
E
=
80
°C
T R
A
NG
E
=
4
0°
C
T
R
A
N
G
E
=
2
0
°C
T
R
A
N
G
E
=
1
0
°C
T
R
A
N
G
E
=
5
°C
02402-023
Figure 23. PWM Duty Cycle vs. Temperature Slope (TRANGE)
Figure 24 shows how, for a given TRANGE, changing the TMIN
value affects the loop. Increasing the TMIN value increases the
TMAX (temperature at which the fan runs full speed) value, since
TMAX = TMIN + TRANGE. Note, however, that the PWM duty cycle
vs. temperature slope remains exactly the same. Changing the
TMIN value merely shifts the control slope. The TMIN can be
changed in increments of 4°C.
TEMPERATURE (
°C)
P
W
M
DUTY
CY
CLE
(%)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
20
40
60
80
TMAX = TMIN + TRANGE
T R
A
N
G
E
=
4
0°
C
T R
A
N
G
E
=
4
0°
C
T R
A
N
G
E
=
4
0°
C
02402-024
Figure 24. Effect of Increasing TMIN Value on Control Loop
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