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Hardware
2.2
FUNCTIONAL OVERVIEW
The block diagram shown in Figure 2-2 illustrates the operation of the Daughter Board.
FIGURE 2-2:
DAUGHTER BOARD BLOCK DIAGRAM
Output Offset Adjustment
Thermocouple
Differential
Amplifier
Anti-Aliasing
Low-Pass Filter
AN9
Linear
TC1047A
Temperature
Sensor IC
Anti-Aliasing
Low-Pass Filter
Level Shift Adjustment
AN8
Explorer 16
Development
Board
Connector
Signal
Level
Anti-Aliasing
Shifter
Low-Pass Filter
AN7
2.2.1
Thermocouple Signal Conditioning
The incoming signals come from the differential voltage outputs of a thermocouple (not
included with the Daughter Board) plugged into thermocouple connector J1. These
signals are amplified by a differential amplifier implemented using three operational
amplifiers in an MCP619 quad op amp device. The external components of the
differential amplifier have been selected to provide amplification by a factor of 249.
The fourth op amp in this device is used to provide a constant 1.65V voltage reference
to the differential amplifier as well as to the level shifter circuit (described in
requirements, the user can adjust the output offset of the differential amplifier by
adjusting the potentiometer R38.
Some users may choose to perform input offset calibration of the differential amplifier.
This can be accomplished by mounting a capacitor (C3) and installing a jumper on J5.
The single-ended output of the differential amplifier is routed to an MCP617 dual op
amp device. The two op amps in this device are configured to serve as an anti-aliasing
low-pass filter, in a 4th-order Sallen-Key structure. This limits the bandwidth of the input
signal to approximately 3300 Hz. The output of this filter is routed to pin 69 of the PICtail
Plus interface header J4 on the Explorer 16 Development Board, for analog-to-digital
conversion and further processing by a dsPIC33F or PIC24H device. For a
dsPIC33FJ12GP202 Plug-in Module (PIM), this pin is routed to the ADC input AN9 of
the dsPIC33FJ12GP202 device.
2.2.2
Temperature Sensor IC Signal Conditioning
A TC1047A temperature sensor IC is provided on the Daughter Board. The output
voltage of the temperature sensor IC has an amplitude of 10 mV per degree Celsius
and a constant output voltage offset of 500 mV. This signal is primarily intended to ease
the implementation of cold junction compensation in the application software by
providing an approximate reference for the temperature of the Daughter Board itself.
However, the TC1047A can also be used independently as an alternative temperature
sensor.
? 2008 Microchip Technology Inc.
DS70574A-page 15
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