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EMC2104-BP-TR 参数 Datasheet PDF下载

EMC2104-BP-TR图片预览
型号: EMC2104-BP-TR
PDF下载: 下载PDF文件 查看货源
内容描述: [Switching Controller]
分类和应用: 风扇控制器
文件页数/大小: 101 页 / 1474 K
品牌: SMSC [ SMSC CORPORATION ]
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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown  
Datasheet  
6.6  
Beta Configuration Registers  
Table 6.8 Beta Configuration Registers  
ADDR  
R/W  
REGISTER  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
DEFAULT  
External Diode 1  
Beta  
Configuration  
14h  
R/W  
-
-
-
AUTO  
BETA1[3:0]  
BETA2[3:0]  
BETA3[3:0]  
10h  
External Diode 2  
Beta  
Configuration  
15h  
16h  
R/W  
R/W  
-
-
-
-
-
-
AUTO  
AUTO  
10h  
10h  
External Diode 3  
Beta  
Configuration  
The Beta Configuration Registers control advanced temperature measurement features for each  
External Diode channel. The Beta Configuration Registers are software locked. The External Diode 1  
Beta Configuration Register Is hardware locked if the SHDN_SEL pin is not set to disable the Critical  
/ Thermal Shutdown functionality (see Table 6.1).  
Bit 4 - AUTO - Enables the Automatic Beta detection algorithm.  
„
„
‘0’ - The Automatic Beta detection algorithm is disabled. The BETAx[3:0] bit settings will be used  
to control the beta compensation circuitry.  
‘1’ (default) - The Automatic Beta detection algorithm is enabled. The circuitry will automatically  
detect the transistor type and beta values and configure the BETAx[3:0] bits for optimal  
performance.  
Bits 3 - 0 - BETAx[3:0] - hold a value that corresponds to a range of betas that the Beta Compensation  
circuitry can compensate for. These four bits will always show the current beta setting used by the  
circuitry. If the AUTO bit is set (default), then these bits may updated by the device with every  
temperature conversion. If the AUTO bit is not set, then the value of these bits is used to drive the  
beta compensation circuitry. In this case, these bits should be set with a value corresponding to the  
lowest expected value of beta for the PNP transistor being used as a temperature sensing device.  
See Table 6.9 for supported beta ranges. A value of 1111b indicates that the beta compensation  
circuitry is disabled. In this condition, the diode channels will function with default current levels and  
will not automatically adjust for beta variation. This mode is used when measuring a discrete 2N3904  
transistor or AMD thermal diode.  
All of the Beta Configuration Registers are Software Locked.  
Table 6.9 Beta Compensation Look Up Table  
BETAX[3:0]  
AUTO  
3
2
1
0
MINIMUM BETA  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0.050  
0.066  
0.087  
0.114  
0.150  
SMSC EMC2104  
Revision 1.74 (05-08-08)  
DATA5S3HEET