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THERMAL/LINEAR INTELLIGENT
SENSOR PICtail? PLUS
DAUGHTER BOARD
Chapter 3. Thermal Interface Demonstration
This chapter describes a simple program that demonstrates how to use the Daughter
Board to capture and process signals from a common type of temperature sensor: a
K-type thermocouple. Topics covered include:
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?
?
?
3.1
OVERVIEW
The CD that accompanies the Daughter Board contains a thermal interface
demonstration application. All files pertaining to this demonstration are located in the
following folder on the CD: demo\Thermal Interface Demo .
As shown in Figure 3-1, this sample application uses the Daughter Board to perform
signal conditioning on the output of a K-type thermocouple, and uses the on-chip ADC
of the dsPIC33FJ12GP202 device to convert the signal to a digital form.
The TC1047A temperature sensor IC on the Daughter Board is utilized to perform cold
junction compensation in the application software. In addition, the application software
uses the Digital Signal Processing (DSP) features of the dsPIC33F architecture to
perform averaging and linearization of the converted sensor output samples.
Finally, the application converts the linearized voltage to its corresponding temperature
equivalent, and displays this temperature in the Watch window and the Data Monitor
and Control Interface (DMCI) using the MPLAB REAL ICE in-circuit emulator.
FIGURE 3-1:
AN9
THERMAL INTERFACE DEMONSTRATION
dsPIC33FJ12GP202
Block
Averaging
Conditioned
Thermocouple
Signals
AN8
Block
Cold Junction
Compensation
Linearization
and
Conversion to
Temperature
Averaging
Conditioned
TC1047A
Signals
? 2008 Microchip Technology Inc.
Data Monitor and
Control Interface
(MPLAB ? REAL ICE?
in-circuit emulator)
DS70574A-page 17
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