參數(shù)資料
型號(hào)： ADM1031ARQZ-REEL
廠商： ANALOG DEVICES INC
元件分類(lèi)： 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(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 596K
代理商： ADM1031ARQZ-REEL
ADM1031
Rev. B | Page 16 of 36
Fan Spin-Up
As mentioned in the How Does the Control Loop Work? section,
once the temperature being measured exceeds the TMIN value
programmed, the fan turns on at minimum speed (default =
33% duty cycle). However, the problem with fans being
driven by PWM is that 33% duty cycle is not enough to reliably
start the fan spinning. The solution is to spin the fan up for a
predetermined time, and once the fan has spun up, its running
speed can be reduced in line with the temperature being
measured.
The ADM1031 allows fan spin-up times between 200 ms
and 8 seconds. Bits <2:0> of Fan Characteristics Register 1
(Register 0×20) and Fan Characteristic Register 2 (Register
0×21) program the fan spin-up times.
Table 9. Fan Spin-Up Times
Bits 2:0
Spin-Up Time (Fan Characteristics Registers 1, 2)
000
200 ms
001
400 ms
010
600 ms
011
800 ms
100
1 sec
101
2 sec (Default)
110
4 sec
111
8 sec
Once the automatic fan speed control loop parameters have
been chosen, the ADM1031 device can be programmed. The
ADM1031 is placed into automatic fan speed control mode by
setting Bit 7 of Configuration Register 1 (Register 0×00). The
device powers up in automatic fan speed control mode by default.
The control mode offers further flexibility in that the user can
decide which temperature channel/channels control each fan.
Table 10. Auto Mode Fan Behavior
Bits
6, 5
Control Operation (Configuration Register 1)
00
Remote Temperature 1 Controls Fan 1
Remote Temperature 2 Controls Fan 2
01
Remote Temperature 1 Controls Fan 1 and 2
10
Remote Temperature 2 Controls Fan 1 and 2
11
Maximum Speed Calculated by Local and Remote
Temperature Channels Controls Fans 1 and 2
When Bit 5 and Bit 6 of Configuration Register 1 are both
set to 1, increased flexibility is offered. The local and remote
temperature channels can have independently programmed
control loops with different control parameters. Whichever
control loop calculates the fastest fan speed based on the
temperature being measured, drives the fans.
Figure 25 and Figure 26 show how the fan’s PWM duty cycle is
determined by two independent control loops. This is the type
of auto mode fan behavior seen when Bit 5 and Bit 6 of
Configuration Register 1 are set to 11. Figure 25 shows the
control loop for the local temperature channel. Its TMIN value
has been programmed to 20°C, and its TRANGE value is 40°C.
The local temperature’s TMAX is thus 60°C. Figure 26 shows
the control loop for the remote temperature channel. Its TMIN
value has been set to 0°C, while its TRANGE = 80°C. Therefore,
the remote temperature’s TMAX value is 80°C.
Consider if both temperature channels measure 40°C. Both
control loops calculate a PWM duty cycle of 66%. Therefore, the
fan is driven at 66% duty cycle. If both temperature channels
measure 20°C, the local channel calculates 33% PWM duty cycle,
while the Remote 1 channel calculates 50% PWM duty cycle.
Thus, the fans are driven at 50% PWM duty cycle. Consider the
local temperature measuring 60°C while the Remote 1 tempera-
ture is measuring 70°C. The PWM duty cycle calculated by the
local temperature control loop is 100% (because the temperature
= TMAX). The PWM duty cycle calculated by the Remote 1
temperature control loop at 70°C is approximately 90%.
Therefore, the fan runs full-speed (100% duty cycle). Remember,
that the fan speed is based on the fastest speed calculated, and is
not necessarily based on the highest temperature measured.
Depending on the control loop parameters programmed, a lower
temperature on one channel, can actually calculate a faster speed
than a higher temperature on the other channel.
LOCAL TEMPERATURE (
°C)
P
W
M
DUTY
CY
CLE
(%)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
20
40
60
TMAX = TMIN + TRANGE
T R
A
N
G
E
=
4
0°
C
02402-025
Figure 25. Maximum Speed Calculated by Local Temperature
Control Loop Drives Fan
REMOTE TEMPERATURE (
°C)
P
W
M
DUTY
CY
CLE
(%)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
20
40
70
80
TMAX = TMIN + TRANGE
T R
AN
G
E
=
80
°C
02402-026
Figure 26. Maximum Speed Calculated by Remote Temperature
Control Loop Drives Fan
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