欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号EMC2104-BP-TR的Datasheet PDF文件第82页浏览型号EMC2104-BP-TR的Datasheet PDF文件第83页浏览型号EMC2104-BP-TR的Datasheet PDF文件第84页浏览型号EMC2104-BP-TR的Datasheet PDF文件第85页浏览型号EMC2104-BP-TR的Datasheet PDF文件第87页浏览型号EMC2104-BP-TR的Datasheet PDF文件第88页浏览型号EMC2104-BP-TR的Datasheet PDF文件第89页浏览型号EMC2104-BP-TR的Datasheet PDF文件第90页  
Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown  
Datasheet  
Appendix A Thermistors  
The EMC2104 can monitor thermistor inputs on the TRIP_SET / VIN4 as well as supporting a  
thermistor option on the all of the external diode pins pairs (DP1 / VREF_T1 and DN1 / VIN1,etc.).  
The Thermistors can be connected as shown in Figure A.1.  
Figure A.1 is representative of one of the thermistor channels and will apply to DP1 / VREF_T1 and  
DN1 / VIN1, DP2 / VREF_T2 and DN2 / VIN2.  
The top side resistor is internally integrated in the case of the TRIP_SET / VIN4 channel and the VREF  
voltage will not be brought out externally. The Thermistor should be connected in the same way as  
RSET.  
EMC2104/5/6  
DP3 / DN4 / VREF_T3  
Reference  
Buffer  
Voltage  
1.2K  
1%  
DN3 / DP4 / VIN3  
ADC  
10K 1%  
Thermistor  
0.1uF  
Figure A.1 “Low Side” Thermistor Connection  
The relationship between voltage and temperature is roughly linear. the measured voltage by the  
EMC2104 will be inversely proportional to temperature .  
Linearization methods can only accurately capture the temperature over a limited window of  
temperatures.  
For a 10k Ohm type 3370 Thermistor and a 1.2k ohm ±1% setting resistor, the output response  
corresponding to a thermistor is tabulated in Table A.1.  
If the INV_VINx bit is set then the results of the circuit (configured as shown in Figure A.1) is shown  
in Table A.2.  
The EMC2104 does not perform any numerical calculations on the thermistor value if a thermistor is  
monitored on TRIP_SET / VIN4 pin. If the External Diode 1, External Diode 2, or External Diode 3  
channels are configured to measure a thermistor, it must be configured as shown in Figure A.1.  
When measuring a thermistor input with Fan Control Look Up Table, care must be taken that the  
temperature thresholds are entered as a unsigned voltage number that corresponds to the desired  
thermal threshold. Also note that the LUT assumes that the VIN1 and TRIP_SET / VIN4 voltage inputs  
are directly proportional to temperature.  
Revision 1.74 (05-08-08)  
SMSC EMC2104  
DATA8S6HEET