Mixed Signal PICtail™ Demo Board User’s Guide
DS51523A-page 2
2004 Microchip Technology Inc.
ABOUT THIS GUIDE
Document Layout
This document describes how to use the Mixed Signal PICtail™ Demo Board. The
manual layout is as follows:
•
Chapter 1. Product Overview
– Important information about the Mixed Signal
PICtail™ Demo Board.
•
Chapter 2. Installation and Operation
– Includes instructions on how to get
started with this demo board and a detailed description of each function of the
demo board.
•
Appendix A. Schematics and Layouts
– Shows the schematic and layout
diagrams for the Mixed Signal PICtail™ Demo Board.
•
Appendix B. Bill-Of-Materials (BOM)
– Lists the parts used to build the Mixed
Signal PICtail™ Demo Board.
•
Appendix C. MixedSignal_V100.asm Description
– Example “Main” assembly
firmware for the PIC16F767-I/SS microcontroller used to demonstrate the various
features of the supported analog products.
•
Appendix D. DAC_dtmf.asm Source Code
– Example assembly source
firmware used to generate Dual Tone Multiple Frequency (DTMF) signals. This
firmware is utilized by the “Main” firmware,
MixedSignal_v100.ASM
.
•
Appendix E. MixedSignal_16f767i.lkr Source Code
– Linker script file used to
build the example PIC16F767 firmware.
•
Appendix F. DTMF Scope Captures
– Oscilloscope screen captures of the
various DTMF tones displaying their FFT to illustrate the quality of the DTMF
tones.
•
Appendix G. Scope Probe Noise Captures
– Isolating scope probe noise is
challenging. These scope captures illustrate the difference between using a
standard scope probe and using coaxial cable directly from the board into the
scope.
•
Appendix H. Sine Wave and Filtered DTMF Scope Captures
– Oscilloscope
screen capture of the 32-step sine wave routine and the DTMF waveform. The
DTMF waveform illustrates the non-filtered DAC output and a simple RC-filtered
output.
•
Appendix I. MPLAB® IDE Screen Capture
– MPLAB IDE 6.3x was used to gen-
erate the example source firmware. This screen capture illustrates the tool, the
project files and the included Watch windows.
