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參數(shù)資料
| 型號： | ADM1033 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Thermal Monitor and Fan Speed (RPM) Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 29/40頁 |
| 文件大小： | 1164K |
| 代理商： | ADM1033 |
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ADM1033
Rev. 0 | Page 29 of 40
FAN SPEED
T1
T2
T (3 TO 8) = 191
°
C
TEMPERATURE
TACH COUNT 2 TO 8
TACH COUNT 1
0
Figure 42. Programming Two Points on the Look-Up Table
Once the temperature exceeds the highest temperature point in
the look-up table, the fan speed remains at the highest speed
until the temperature drops below the T7 temperature value.
If the temperatures in T1 to T8 are not programmed in
succession, the fan speed moves to the next highest pro-
grammed temperature as the temperature increases. Similarly,
when the temperature decreases, it ignores programmed higher
temperatures and jumps to the next lower temperature. There-
fore, the temperature-to-fan-speed profile for increasing and
decreasing temperature can be different.
When programming the look-up table, the user has the option
to use between two and eight points for the fan (eight points
only if the same curve is to be used for both fans).
If the user wants to program only the transfer curve and knows
the starting temperature, minimum fan speed, maximum
temperature, and maximum fan speed, then only four parame-
ters are required: T1, T2, FS1, and FS2. The remaining look-up
temperature thresholds should remain at their default values of
+191°C. FS 3 to FS8 should be programmed with the same value
as FS2 to give the flat curve, if required, or, they can be left at
the default value of 0.
However, it is normal to program a THERM limit as well. Once
this temperature is exceeded and the boost bit is set, the fan
runs to full speed. This overrides the table.
Table 29. Look-Up Table Register Addresses
x
Temperature, x
RPMx, LSB
1
0x22
0x2A
2
0x23
0x2C
3
0x24
0x2E
4
0x25
0x30
5
0x26
0x32
6
0x27
0x34
7
0x28
0x36
8
0x29
0x38
RPMx, MSB
0x2B
0x2D
0x2F
0x31
0x33
0x35
0x37
0x39
SETTING UP THE LOOK-UP TABLE
IN LINEAR MODE
When discrete/linear speed (Bit 2) is set to 1 (default), the
TACH count decreases linearly and the fan speed increases with
temperature. At temperature T
X
, the fan runs at FS
X
and speed
increases with temperature to FS
X+1
at temperature T
X+1
.
Alternatively, the fan can be run at discrete fan speeds. When
discrete/linear speed (Bit 2) is set to 0, the fan runs at a new
speed once the temperature threshold is exceeded.
SELECTING WHICH TEMPERATURE CHANNEL
CONTROLS A FAN
Fan Behavior Register (Address 0x07)
Bits <1:0> = DRIVE Behavior
The ADM1033 can be configured so that either the local
temperature or the remote temperature controls the fan.
In default, the remote temperature controls the fan.
Table 30. Drive BHVR Bits
Bits
Drive x BHVR
00
Local Temperature Controls the Fan
01
Remote Temperature Controls the Fan
10
Remote Temperature Controls the Fan
11
Fan Runs at Full Speed
LOOK-UP TABLE HYSTERESIS
The user can program a hysteresis to be applied to the look-up
table. The advantage of this is apparent, if the temperature is
cycling around one of the threshold temperatures, particularly
when the look-up table is configured in discrete mode. It is not
as important in linear mode.
Table 31. Programming the Hysteresis
Code
0000 0000
0000 0001
0000 0010
0000 0101
0000 1000
0000 1111
Hysteresis Value
0°C
1°C
2°C
5°C
8°C
15°C
The hysteresis register of the look-up table is at Address 0x3A.
A hysteresis value of between 0°C and 15°C can be
programmed with a resolution of 1°C and applied to all the
temperature thresholds. Table 31 gives sample values for
programming.
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