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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  
Next Desired  
Setting  
Max  
Step  
Max  
Step  
Previous  
Setting  
Update  
Time  
Update  
Time  
Setting Changed  
Figure 5.6 Ramp Rate Control  
5.9  
Watchdog Timer  
The EMC2104 contains two internal Watchdog Timers. Once the device has powered up the watchdog  
timer monitors the SMBus traffic for signs of activity. The Watchdog Timer starts when the internal  
supply has reached its operating point. The Watchdog Timer only starts immediately after power-up  
and once it has been triggered or deactivated will not restart.  
Each fan driver has an independent watchdog timer. Disabling the watchdog associated with Fan 1  
will not disable the watchdog associated with Fan 2.  
If four (4) seconds elapse without the system host programming the device, then the watchdog will be  
triggered and the following will occur:  
1. The WATCH status bit will be set.  
2. The fan driver will be set to full scale drive. It will remain at full scale drive until one of the three  
conditions listed below are met.  
If the Watchdog Timer is triggered, the following three operations will disable the timer and return the  
device to normal operation. Alternately, if the Watchdog Timer has not yet been triggered performing  
any one of the following will disable it.  
1. Writing the Fan Setting Register will disable the Watchdog Timer.  
2. Enabling the RPM based Fan Speed Control Algorithm by setting the EN_ALGO bit will disable the  
Watchdog Timer. The fan driver will be set based on the RPM based Fan Speed Control Algorithm.  
3. Setting the LUT_LOCK bit will disable the Watchdog Timer. The fan driver will be set based on the  
Look Up Table settings.  
Writing any other configuration registers will not disable the Watchdog Timer.  
Revision 1.74 (05-08-08)  
SMSC EMC2104  
DATA3S4HEET