资料介绍
Various concerns must be addressed when dealing
with temperature sensing applications, which fall into
two broad categories: precision temperature measure-
ment and system thermal management. Precision
temperature measurement applications (such as those
encountered in the process control industry) require
highly accurate temperature sensors. Applications of
this type frequently use a thermocouple (or higher
precision sensor) in concert with low offset/low drift
analog interface circuits to acquire and condition the
temperature signal with minimum error. Sensor
absolute accuracy and linearity are primary
considerations; sensor cost is a secondary issue.
System thermal management schemes, on the other
hand, regulate the creation (and/or disposal) of heat
within the system. Examples of system thermal man-
agement applications are CPU over-temperature
detectors in personal computers and thermal shutdown
circuits in power systems. The temperature sensor
must be accurate enough to detect when temperature
is approaching the upper boundry of the “safe” operat-
ing limit. Typically, full scale sensor measurement
errors of 2°C to 5°C are adequate for such applications.
The primary concerns in sensor selection are sensor
cost, size, and ease of interface to the processor. TB067
Temperature Sensor Strategies Keep System Thermal
Problems in Check
Author: Microchip Technology Inc. OVER-TEMPERATURE SHUTDOWN
Heat sinking the high power dissipation devices in a
system is the simplest thermal management strategy.
INTRODUCTION In this case, only the system must be monitored for
Various concerns must be addressed when dealing catastrophic over-temperature conditions due to a
with temperature
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