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Mixed Signal PICtail? Demo Board User’s Guide
Modes 1XXX primarily utilize TC132X DAC modes:
1. Mode1000: Generate a 100 Hz 32-step sine wave on the TC132X. Analyze
output on V OUTC . See Appendix H. “Sine Wave and Filtered DTMF Scope
Captures” for resulting unfiltered waveform.
2. Mode1001: Send 000h and FFFh commands to generate a 100 Hz R-R output
on the TC132X. Probe V OUTC to see the resulting waveforms.
3. Mode1010: Send 400h and BFFh commands to generate a 100 Hz output on the
TC132X. Probe V OUTC to see the resulting waveforms.
4. Mode1011: DAC = SHDN, PIC = SLEEP. This mode demonstrates the
low-power nature of the DAC, the PICmicro microcontroller, the op amp and the
LDO. A power cycle is required after the mode switch is changed to exit this
mode.
5. Mode1100: DAC = 200h and Read with PIC16F767 10b ADC, “broadcast on
USART”. A IN_C can be analyzed using Microchip’s Data View analysis tool,
which, along with the MCP3551 USB evaluation board, provides a “canned”
analysis solution.
6. Mode1101: DAC = 200h and Read with MCP3302 13b single-ended, “broadcast
on USART”. A IN_C can be analyzed using Microchip’s Data View analysis tool,
which, along with the MCP3551 USB evaluation board, provides a “canned”
analysis solution.
7. Mode1110: Open for user to define their own routine.
8. Mode1111: Open for user to define their own routine.
Refer to Appendix C. “MixedSignal_V100.asm Description” to view source code
and comments.
Refer to Appendix D. “DAC_dtmf.asm Source Code” to view source code and
comments.
Refer to Appendix E. “MixedSignal_16f767i.lkr Source Code” to view the script.
Refer to the p16F767.inc standard include file located in your
“\MPLAB IDE\MCHIP_Tools\” folder.
DS51523A-page 14
? 2004 Microchip Technology Inc.
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