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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  
5.1  
Critical/Thermal Shutdown  
The EMC2104 provides a hardware Critical/Thermal Shutdown function for systems. Figure 5.2 is a  
block diagram of this Critical/Thermal Shutdown function. The Critical/Thermal Shutdown function in  
the EMC2104 accepts configuration information from the fixed states of the SHDN_SEL pin as  
described in Section 5.1.1.  
Each of the software programmed temperature limits can be optionally configured to act as inputs to  
the Critical / Thermal Shutdown independent of the hardware shutdown operation. When configured to  
operate this way, the SYS_SHDN# pin will be asserted when the temperature meets or exceeds the  
limit. The pin will be released when the temperature drops below the limit however the individual status  
bits will not be cleared if set (see Section 6.13).  
The analog portion of the Critical/Thermal Shutdown function monitors the hardware determined  
temperature channel (see Section 5.1.1). This measured temperature is then compared with  
TRIP_SET point. This TRIP_SET point is set by the system designer with a single external resistor  
divider as described in Section 5.1.2.  
The SYS_SHDN# is asserted when the indicated temperature exceeds the temperature threshold  
established by the TRIP_SET input pin for a number of consecutive measurements defined by the fault  
queue. If the HW_SHDN output is asserted and the temperature drops below the Thermal / Critical  
Shutdown threshold then it will be set to a logic ‘0’ state.  
Register Enabled  
Critical Shutdown Logic  
Sensor  
SMBus Traffic  
Register Enabled  
Sensor  
Configuration  
Register  
Temperature  
Conversion  
and Limit  
Register Enabled  
Sensor  
Registers  
SW_SHDN  
Register Enabled  
Sensor  
PIN Decode  
‘1’  
Internal Diode  
Channel  
SHDN_SEL  
External Diode 1  
Temperature  
Conversion  
1
VREF  
SYS_SHDN#  
HW_SHDN  
0
TRIP_SET  
Voltage  
Conversion  
Figure 5.2 EMC2104 Critical/Thermal Shutdown Block Diagram  
Revision 1.74 (05-08-08)  
SMSC EMC2104  
DATA2S2HEET