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EMC2302-1-AIZL-TR 参数 Datasheet PDF下载

EMC2302-1-AIZL-TR图片预览
型号: EMC2302-1-AIZL-TR
PDF下载: 下载PDF文件 查看货源
内容描述: 基于RPM的双PWM风扇控制器 [Dual RPM-Based PWM Fan Controller]
分类和应用: 风扇控制器
文件页数/大小: 44 页 / 627 K
品牌: SMSC [ SMSC CORPORATION ]
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Dual RPM-Based PWM Fan Controller  
Datasheet  
Table 5.22 Spin Time  
SPINUP_TIMEX[1:0]  
1
0
TOTAL SPIN UP TIME  
0
0
1
1
0
1
0
1
250 ms  
500 ms (default)  
1 sec  
2 sec  
5.13  
Fan Max Step Registers  
Table 5.23 Fan Max Step Registers  
ADDR  
R/W  
REGISTER  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
DEFAULT  
Fan 1 Max  
Step  
37h  
47h  
R/W  
-
-
32  
16  
8
4
2
1
10h  
Fan 2 Max  
Step  
R/W  
-
-
32  
16  
8
4
2
1
10h  
The Fan Max Step registers, along with the Update Time, control the ramp rate of the fan driver  
response calculated by the RPM-based Fan Speed Control Algorithm. The value of the register  
represents the maximum step size each fan driver will take between update times (see Section 5.9).  
When the FSC algorithm is enabled, Ramp Rate control is automatically used. When the FSC is not  
active, then Ramp Rate control can be enabled by asserting the EN_RRC bit (see Section 5.10).  
APPLICATION NOTE: The UPDATE bits and Fan Step Register settings operate independently of the RPM-based  
Fan Speed Control Algorithm and will always limit the fan drive setting. That is, if the  
programmed fan drive setting (either as determined by the RPM-based Fan Speed Control  
Algorithm or by manual settings) exceeds the current fan drive setting by greater than the  
Fan Step Register setting, the EMC2302 will limit the fan drive change to the value of the  
Fan Step Register. It will use the Update Time to determine how often to update the drive  
settings.  
APPLICATION NOTE: If the Fan Speed Control Algorithm is used, the default settings in the Fan Configuration 2  
Register will cause the maximum fan step settings to be ignored.  
The Fan Max Step registers are software locked.  
SMSC EMC2302  
Revision 1.1 (10-12-09)  
DATA3S5HEET