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Timestamp:
05/31/01 04:29:56 (14 years ago)
Author:
mds
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minor update

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  • lm-sensors/trunk/doc/temperature-sensors

    r425 r1103  
    1 Termistor and Transistors as Temperature Sensors 
    2 ------------------------------------------------ 
     1Thermistors and Transistors as Temperature Sensors 
     2-------------------------------------------------- 
    33Temperature measuring chips that use external sensors 
    44generally are designed to use either thermistors or 
     
    2020 Thermometrics has a comprehensive guide) 
    2121 
    22 NTC (negative temperature coefficient) thermistors 
    23 have a parameter B (beta), units are K (kelvin). 
     22NTC (negative temperature coefficient) thermistors decrease their 
     23resistance with an increase in temperature. 
     24They commonly have a parameter B (beta), units are K (kelvin). 
    2425B is the "material constant" of the thermistor and 
    2526is a measure of the change of resistance with respect to temperature. 
     
    4748is exponentially related to temperature. 
    4849 
     50PTC (positive temperature coefficient) thermistors increase 
     51in resistance with an increase in temperature. They are not 
     52commonly used for accurate temperature sensing. 
    4953 
    5054 
     
    98102W83782D/W83783S chips are exceptions, they can be 
    99103configured for either. 
     104 
     105 
     106------------------ 
     107Copyright (c) 1999, 2001 Mark D. Studebaker <mdsxyz123@yahoo.com>