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THERMAL/LINEAR INTELLIGENT
SENSOR PICtail? PLUS
DAUGHTER BOARD
Chapter 1. Introduction
Thank you for purchasing Microchip Technology's Thermal/Linear Intelligent Sensor
PICtail? Plus Daughter Board. This board provides the signal conditioning circuits
necessary to interface thermal and linear sensor signals to a dsPIC ? Digital Signal
Controller (DSC) or a PIC24H microcontroller (MCU).
The Thermal/Linear Intelligent Sensor PICtail Plus Daughter Board is used with either
the Explorer 16 Development Board or the 16-bit 28-pin Starter Development Board to
demonstrate the acquisition, analog-to-digital conversion (dsPIC DSC or PIC24H
devices) and signal processing of typical sensor signals using the architectural and
peripheral features of dsPIC DSC devices.
This chapter introduces the Thermal/Linear Intelligent Sensor PICtail Plus Daughter
Board (simplified as Daughter Board throughout this document) and provides an
overview of the features. Topics covered include:
? Overview
1.1
OVERVIEW
The Daughter Board fits into the expansion slot on the Explorer 16 Development Board
and interfaces between an external sensor and the dsPIC33F or PIC24H device on the
Explorer 16 Development Board. The Daughter Board is intended to support the
development of intelligent sensor processing applications using Microchip's 16-bit DSC
and MCU device families.
Alternately, the Daughter Board may be plugged into the pin header on the 16-bit
28-pin Starter Development Board using connector J2 (refer to Figure 2-1 in
The differential output signals from the thermocouple (not provided with the Daughter
Board) are amplified, passed through an anti-aliasing filter and routed to the
Analog-to-Digital Converter (ADC) module on the dsPIC33F or PIC24H device for
software processing. A TC1047A temperature sensor IC is also provided on the board.
The output of this temperature sensor is passed through another anti-aliasing filter and
routed to the ADC.
The Daughter Board also provides a generic linear signal interface to which any
single-ended sensor output (or even an artificially synthesized signal) can be supplied.
Just like the thermocouple and TC1047A output signals, this linear signal is conditioned
using an anti-aliasing filter, but it is also level-shifted in order to allow bipolar sensor
signals to be sampled by the unipolar ADC on the dsPIC33F or PIC24H device.
The Explorer 16 Development Board (or 16-bit 28-pin Starter Development Board)
supplies power to the Daughter Board.
The Daughter Board is shown in Figure 1-1. This document reflects the usage of the
Daughter Board with the Explorer 16 Development Board; however, the 16-bit 28-pin
Starter Development Board has similar set up requirements.
? 2008 Microchip Technology Inc.
DS70574A-page 7
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