參數(shù)資料
型號(hào)： ADM1033ARQ-REEL
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), 2Cel, RECTANGULAR, SURFACE MOUNT
封裝： MO-137AB, QSOP-16
文件頁(yè)數(shù)： 22/39頁(yè)
文件大?。?/td> 819K
代理商： ADM1033ARQ-REEL
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
04
91
8-
0-
04
1
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
RPMx, MSB
1
0x22
0x2A
0x2B
2
0x23
0x2C
0x2D
3
0x24
0x2E
0x2F
4
0x25
0x30
0x31
5
0x26
0x32
0x33
6
0x27
0x34
0x35
7
0x28
0x36
0x37
8
0x29
0x38
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 TX, the fan runs at FSX and speed
increases with temperature to FSX+1 at temperature TX+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
Hysteresis Value
0000 0000
0°C
0000 0001
1°C
0000 0010
2°C
0000 0101
5°C
0000 1000
8°C
0000 1111
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.
Rev. 1 | Page 29 of 39 | www.onsemi.com
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