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F71869AD 参数 Datasheet PDF下载

F71869AD图片预览
型号: F71869AD
PDF下载: 下载PDF文件 查看货源
内容描述: 超级I / O +硬件监控 [Super I/O + Hardware Monitor]
分类和应用: 监控
文件页数/大小: 156 页 / 1561 K
品牌: FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
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F71869A  
The range of DC output is 0~3.3V, controlled by 8-bit register. 1 LSB is about 0.013V. The  
output DC voltage is amplified by external OP circuit, thus to reach maximum FAN  
OPERATION VOLTAGE, 12V. The output voltage will be given as followed:  
Programmed 8bit Register Value  
Output_voltage (V) = 3.3×  
255  
And the suggested application circuit for DAC fan control would be:  
+12V  
R
4.7K  
PMOS  
U1A  
Q1  
3
2
D1  
1N4148  
+
-
1
DC OUTPUT VOLTAGE  
R
LM358  
R
4.7K  
JP1  
R
27K  
3
2
1
FANIN MONITOR  
10K  
C
47u  
C
0.1u  
R
10K  
CON3  
R
3.6K  
Figure 5 DAC fan control application circuit  
2. PWM duty Fan Control  
The duty cycle of PWM can be programmed by a 8-bit register. The default duty cycle is  
set to 100%, that is, the default 8-bit registers is set to FFh. The expression of duty can be  
represented as follows.  
Programmed 8bit Register Value  
Duty_cycle(%) =  
×100%  
255  
+12V  
R2  
R1  
PNP Transistor  
D
G
NMOS  
S
+
C
FAN  
-
Figure 6 +12/5V PWM fan control application circuit  
27  
Oct., 2011  
V0.19P  
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