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參數資料
型號: W83791D
廠商: WINBOND ELECTRONICS CORP
元件分類: 模擬信號調理
英文描述: W83791D Winbond H/W Monitoring IC
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封裝: LQFP-48
文件頁數: 30/46頁
文件大小: 636K
代理商: W83791D
W83791D
Preliminary
Publication Release Date: Aug, 2001
Revision 0.41
23
+12V
FAN
R1
R2
NMOS
S
PNP Transi stor
C
+
-
PWMCl ock Input
D
G
Fi gure 9.
6.7.3 Smart Fan Control
W83791D supports three Smart Fan function and mapping to temp1 (FAN1, PWMOUT1), temp2 (FAN2,
PWMOUT2) , temp3( FAN3, PWMOUT3) .Smart Fan Control provides two mechanisms. One is Thermal Cruise
mode and the other is Fan Speed Cruise mode.
6.7.3.1 Thermal Cruise mode
At this mode, W83791D provides the Smart Fan system to automatically control fan speed to keep the
temperatures of CPU and the system within specific range. At first a wanted temperature and interval must be set (ex.
55
°
C
±
3
°
C) by BIOS and the fan speed will be lowered as long as the current temperature remains below the
setting value. Once the temperature exceeds the high limit ( 58
°
C), the fan will be turned on with a specific speed set
by BIOS (ex: 80% duty cycle) and automatically controlled its PWM duty cycle with the temperature varying. Three
conditions may occur :
(1) If the temperature still exceeds the high limit (ex: 58
°
C), PWM duty cycle will increase slowly. If the fan has
been operating in its full speed but the temperature still exceeds the high limit (ex: 58
°
C), a warning message will be
issued to protect the system.
(2) If the temperature goes below the high limit (ex: 58
°
C), but still above the low limit (ex: 52
°
C), the fan speed
will be fixed at the current speed because the temperature is in the target range (ex: 52
°
C ~ 58
°
C).
(3) If the temperature goes below the low limit (ex: 52
°
C), PWM duty cycle will decrease slowly to 0 or a preset
stop value until the temperature exceeds the low limit.
Figure 10-1, 10-2 gives an illustration of Thermal Cruise Mode.
A
B
55`C
58`C
52`C
PWM
Duty
Cycle
100
0
50
Fan Start = 20%
C
D
Figure 10-1.
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相關代理商/技術參數
參數描述
W83791G 功能描述:IC MONITOR H/W 48-LQFP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:1 系列:- 功能:溫度監控系統(傳感器) 傳感器類型:內部和外部 感應溫度:-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 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
W83791SD 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W MONITORING IC
W83791SG 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W MONITORING IC
W83792AD 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W Monitoring IC (CSB Version)
W83792AG 功能描述:IC MONITOR H/W 48-LQFP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監控系統(傳感器) 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C,外部傳感器 精確度:±2°C 本地(最大),±3°C 遠程(最大) 拓撲:ADC(三角積分型),比較器,寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP,8-MSOP(0.118",3.00mm 寬) 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND