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參數資料
型號: ADM1029ARQZ-R7
廠商: ON Semiconductor
文件頁數: 21/50頁
文件大小: 402K
描述: IC SENSOR 2TEMP/FAN CTRL 24QSOP
產品變化通告: QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標準包裝: 1,000
功能: 風扇控制,溫度監控器
傳感器類型: 內部和外部
感應溫度: 0°C ~ 100°C,外部傳感器
精確度: ±1°C 本地,±3°C 遠程
拓撲: ADC,風扇控制,寄存器庫
輸出類型: 開路漏極
輸出警報:
輸出風扇:
電源電壓: 3 V ~ 5.5 V
工作溫度: 0°C ~ 100°C
安裝類型: 表面貼裝
封裝/外殼: 24-SSOP(0.154",3.90mm 寬)
供應商設備封裝: 24-QSOP
包裝: 帶卷 (TR)
ADM1029
http://onsemi.com
21
T
MIN
 was defined as being the temperature at which a fan
switched on and ran at minimum speed. This minimum
speed should be set to 33%. If the minimum PWM duty cycle
is programmed to 33%, the fan control loops will operate as
previously described.
It should be noted, however, that changing the minimum
PWM duty cycle affects the control loop behavior.
33
40
47
53
60
66
73
80
87
93
100
Figure 34. Effect of Changing Minimum Duty Cycle
on Control Loop with T
MIN
 and T
RANGE
 Values
TEMPERATURE (癈)
T
MIN
0
16
28
60
1
2
3
40
T
RANGE
 = 40癈
Table 12. PWM DUTY CYCLE SELECT MODE
Decimal Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33% Recommended
06
40%
07
47%
08
53%
09
60%
10 (0x0A)
67%
11 (0x0B)
73%
12 (0x0C)
80%
13 (0x0D)
87%
14 (0x0E)
93%
15 (0x0F)
100% (Default)
* Bits <3:0> set the Minimum PWM duty cycle for Automatic Mode.
Bits <7:4> set the Alarm Speed PWM duty cycle.
Slope 1 of Figure 34 shows T
MIN
  set to 0癈 and the
T
RANGE
 chosen is 40癈. In this case, the fans PWM duty
cycle will vary over the range 33% to 100%. The fan will run
full speed at 40癈. If the minimum PWM duty cycle at which
the fan runs at T
MIN
 is changed, its effect can be seen on
Slopes 2 and 3. Take Case 2, where the minimum PWM duty
cycle is reprogrammed from 33% (default) to 53%. The fan
will actually reach full speed at a much lower temperature,
28癈. Case 3 shows that when the minimum PWM duty
cycle was increased to 73%, the temperature at which the fan
ran full speed was 16癈. So the effect of increasing the
minimum PWM duty cycle, with a fixed T
MIN
 and fixed
T
RANGE
, is that the fan will actually reach full speed (T
MAX
)
at a lower temperature than T
MIN
 + T
RANGE
. How can
T
MAX
 be calculated?
In Automatic Fan Speed Control Mode, the registers
holding the minimum PWM duty cycle at T
MIN
, are the
Minimum/Alarm Speed Registers (addresses 60h, 61h).
Table 12 shows the relationship between the decimal values
written to the Minimum/Alarm Speed Registers and PWM
duty cycle obtained.
The temperature at which each fan will run full speed
(100% duty cycle) is given by:
(eq. 6)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RAN  E
10)
where:
T
MAX
 = Temperature at which fan runs full speed
T
MIN
 = Temperature at which fan will turn on
Max DC   = Maximum Duty Cycle (100%) = 15 decimal
Min DC   = Duty Cycle at TMIN, programmed into 
Fan Speed Config Register
(default = 33% = 5 decimal)
T
RANGE
 = PWM Duty Cycle versus Temperature Slope
Example 1
T
MIN
 = 0?/SPAN>C, T
RANGE
 = 40癈
Min DC   = 53% = 8 decimal (Table 12)
Calculate T
MAX
(eq. 7)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 53% DC) 4010)
T
+ 0 ) ((15 * 8) 4) + 28
T
MAX
 =285C. (As seen on Slope 2 of Figure 34)
Example 2
T
MIN
 = 0?/SPAN>C, T
RANGE
 = 40癈
Min DC   = 73% = 11 decimal (Table 12)
Calculate T
MAX
(eq. 8)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 73% DC) 4010)
T
+ 0 ) ((15 * 11) 4) + 16
T
MAX
 =165C. (As seen on Slope 3 of Figure 34)
Example 3
T
MIN
 = 0?/SPAN>C, T
RANGE
 = 40癈
Min DC   = 33% = 5 decimal (Table 12)
Calculate T
MAX
(eq. 9)
T
MAX
+ T
MIN
) ((Max DC * Min DC) T
RANGE
10)
T
MAX
+ 0 ) ((100% DC * 33% DC) 4010)
T
+ 0 ) ((15 * 5) 4) + 40
T
MAX
 =405C. (As seen on Slope 1 of Figure 34)
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