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LM41CIMTX PDF预览

LM41CIMTX

更新时间: 2024-11-05 22:51:51
品牌 Logo 应用领域
美国国家半导体 - NSC 二极管光电二极管监控
页数 文件大小 规格书
27页 362K
描述
Hardware Monitor with Thermal Diode Inputs and SensorPath⑩ Bus

LM41CIMTX 数据手册

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May 2004  
LM41  
Hardware Monitor with Thermal Diode Inputs and  
SensorPath Bus  
General Description  
— Internal scaling resistors for all inputs  
— Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V  
The LM41 is a hardware monitor that measures 2 tempera-  
ture zones, 5 voltages and has a single-wire interface com-  
patible with National Semiconductor’s SensorPath bus. Sen-  
sorPath data is pulse width encoded, thereby allowing the  
LM41 to be easily connected to many general purpose  
micro-controllers. Several National Semiconductor Super I/O  
products include a fully integrated SensorPath master, that  
when connected to the LM41 can realize a hardware monitor  
function that includes limit checking for measured values,  
autonomous fan speed control and many other functions.  
n Temperature Sensing  
— Remote diode temperature sensor zone  
— Internal local temperature zone  
— 0.5 ˚C resolution  
— Measures temperatures up to 140 ˚C  
n 14-lead TSSOP package  
Key Specifications  
n Voltage Measurement Accuracy  
n Temperature Sensor Accuracy  
n Temperature Range:  
2 % (max)  
3 ˚C (max)  
The LM41 measures the temperature of its own die as well  
as one external device such as a processor thermal diode or  
a diode connected transistor. The LM41 can resolve tem-  
peratures up to 255˚C and down to -256˚C. The operating  
temperature range of the LM41 is 0˚C to +125˚C. Using Σ∆  
ADC it measures +1.2V, +2.5V, +3.3V, +5V and +12V analog  
input voltages with internal scaling resistors. The address  
programming pin allows two LM41’s to be placed on one  
SensorPath bus.  
— LM41 junction  
— Remote Temp Accuracy  
n Power Supply Voltage  
n Average Power Supply Current  
n Conversion Time (all Channels)  
0 ˚C to +85 ˚C  
0 ˚C to +100 ˚C  
+3.0 V to +3.6 V  
0.5 mA (typ)  
22.1ms to 1456ms  
Applications  
n Microprocessor based equipment  
Features  
(Motherboards, Video Cards, Base-stations, Routers,  
ATMs, Point of Sale, …)  
n Power Supplies  
n
SensorPath Interface  
— 2 hardware programmable addresses  
n Voltage Monitoring  
— 9-bit Σ∆ ADC  
Typical Application  
20070301  
SensorPath is a trademark of National Semiconductor Corporation  
© 2004 National Semiconductor Corporation  
DS200703  
www.national.com  

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