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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  
6.23  
Fan Configuration 2 Registers  
Table 6.32 Fan Configuration 1 Registers  
ADDR  
R/W  
REGISTER  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
DEFAULT  
Fan 1  
Configuration  
2
EN_  
RRC1  
GLITCH  
_EN1  
LOWD  
RIVE1  
43h  
R/W  
-
DER_OPT1 [1:0]  
DER_OPT2 [1:0]  
ERR_RNG[1:0]  
ERR_RNG[1:0]  
38h  
Fan 2  
Configuration  
2
EN_  
RRC2  
GLITCH  
_EN2  
LOWD  
RIVE2  
83h  
R/W  
-
38h  
The Fan Configuration 2 Register controls the tachometer measurement and advanced features of the  
RPM based Fan Speed Control Algorithm.  
Bit 6 - EN_RRCx - Enables ramp rate control when the corresponding fan driver is operated in the  
Direct Setting Mode or the Direct Setting with LUT mode.  
„
„
‘0’ (default) - Ramp rate control is disabled. When the fan driver is operating in Direct Setting mode  
or Direct Setting with LUT mode, the fan setting will instantly transition to the next programmed  
setting.  
‘1’ - Ramp rate control is enabled. When the fan driver is operating in Direct Setting mode or Direct  
Setting with LUT mode, the fan drive setting will follow the ramp rate controls as determined by the  
Fan Step and Update Time settings. The maximum fan drive setting step is capped at the Fan Step  
setting and is updated based on the Update Time as given by Table 6.31.  
Bit 5 - GLITCH_ENx - Disables the low pass glitch filter that removes high frequency noise injected  
on the TACHx pin. If the LOWDRIVE bit is set, this bit is ignored and the filter is automatically disabled.  
„
„
‘0’ - The glitch filter is disabled.  
‘1’ (default) - The glitch filter is enabled.  
Bits 4 - 3 - DER_OPTx[1:0] - Control some of the advanced options that affect the derivative portion  
of the RPM based Fan Speed Control Algorithm as shown in Table 6.33.  
Table 6.33 Derivative Options  
DER_OPTX[1:0]  
1
0
OPERATION  
0
0
No derivative options used  
Basic derivative. The derivative of the error from  
the current drive setting and the target is added  
to the iterative Fan Drive Register setting (in  
addition to proportional and integral terms)  
0
1
1
1
0
1
Step derivative. The derivative of the error from  
the current drive setting and the target is added  
to the iterative Fan Drive Register setting and is  
not capped by the Fan Step Register.  
Both the basic derivative and the step derivative  
are used effectively causing the derivative term to  
have double the effect of the derivative term  
(default).  
SMSC EMC2104  
Revision 1.74 (05-08-08)  
DATA6S7HEET