參數(shù)資料
型號： ADM1031ARQ
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： MO-137AB, QSOP-16
文件頁數(shù)： 11/35頁
文件大?。?/td> 368K
代理商： ADM1031ARQ
ADM1031
Rev. 3 | Page 19 of 35 | www.onsemi.com
REMOTE TEMPERATURE (°C)
PWM
DUT
Y
CYCL
E
(
%
)
0
100
93
87
80
73
66
60
53
47
40
33
TMIN
20
40
70
80
TMAX = TMIN + TRANGE
T RA
NG
E
= 8
0°C
02402-
026
Figure 26. Maximum Speed Calculated by Remote Temperature
Control Loop Drives Fan
Programming the Automatic Fan Speed Control Loop
1.
Program a value for TMIN.
2.
Program a value for the slope TRANGE.
3.
TMAX = TMIN + TRANGE.
4.
Program a value for fan spin-up time.
5.
Program the desired automatic fan speed control mode
behavior, that is, which temperature channel controls the fan.
6.
Select automatic fan speed control mode by setting Bit 7 of
Configuration Register 1.
Other Control Loop Parameters
It should be noted that changing the minimum PWM duty
cycle affects the control loop behavior.
Slope 1 of Figure 27 shows TMIN set to 0°C and the TRANGE
chosen is 40°C. In this case, the fan’s PWM duty cycle varies
over the range 33% to 100%. The fan runs full-speed at 40°C. If
the minimum PWM duty cycle at which the fan runs at TMIN is
changed, its effect can be seen on Slope 2 and Slope 3. Take
Case 2, where the minimum PWM duty cycle is reprogrammed
from 33% (default) to 53%.
TEMPERATURE (°C)
0
100
93
87
80
66
60
47
40
33
TMIN
16
28
40
60
P
W
M
DUT
Y
CY
CL
E
(
%
)
73
53
3
1
2
T R
AN
G
E
=
40
°C
02402-
027
Figure 27. Effect of Changing Minimum Duty Cycle on Control Loop
with Fixed TMIN and TRANGE Values
The fan actually reaches full speed at a much lower
temperature, 28°C. Case 3 shows that when the minimum
PWM duty cycle is increased to 73%, the temperature at which
the fan runs full speed is 16°C. Therefore, the effect of
increasing the minimum PWM duty cycle, with a fixed TMIN
and fixed TRANGE, is that the fan actually reaches full speed
(TMAX) at a lower temperature than TMIN + TRANGE.
How can TMAX be calculated?
In automatic fan speed control mode, the register that holds
the minimum PWM duty cycle at TMIN, is the fan speed
configuration register (Register 0×22). Table 11 shows the
relationship between the decimal values written to the fan
speed configuration register and PWM duty cycle obtained.
Table 11. Programming PWM Duty Cycle
Decimal Value
PWM Duty Cycle
00
0%
01
7%
02
14%
03
20%
04
27%
05
33% (Default)
06
40%
07
47%
08
53%
09
60%
10 (0×0A)
67%
11 (0×0B)
73%
12 (0×0C)
80%
13 (0×0D)
87%
14 (0×0E)
93%
15 (0×0F)
100%
The temperature at which the fan runs full-speed
(100% duty cycle) is given by:
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
where:
TMAX = Temperature at which fan runs full-speed.
TMIN = Temperature at which fan turns on.
Max DC = Maximum duty cycle (100%) = 15 decimal.
Min DC = Duty cycle at TMIN, programmed in to fan speed
configuration register (default = 33% = 5 decimal).
TRANGE = PWM duty cycle vs. temperature slope.
Example 1
TMIN = 0°C, TRANGE = 40°C
Min DC = 53% = 8 decimal (Table 11)
Calculate TMAX.
TMAX = TMIN + ((Max DC Min DC) × TRANGE/10)
TMAX = 0 + ((100% DC 53% DC) × 40/10)
TMAX = 0 + ((15 8) × 4) = 28
TMAX = 28°C (as seen on Slope 2 of Figure 27)
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參數(shù)描述
ADM1031ARQ-ND 制造商:ON Semiconductor 功能描述:
ADM1031ARQ-REEL 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADM1031ARQ-REEL7 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADM1031ARQZ 功能描述:馬達/運動/點火控制器和驅(qū)動器 2 CH TDM PWM FAN CTRL IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
ADM1031ARQZ-R7 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
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