DM300014 Microchip Technology, DM300014 Datasheet - Page 32

• Manufacturer Part Number: DM300014
• Description: BOARD DEMO DSPICDEM 1.1 GEN PURP
• Manufacturer: Microchip Technology

Specifications of DM300014

• Processor To Be Evaluated: PIC30F
• Data Bus Width: 16 bit
• Interface Type: RS-485, CAN, SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

dsPICDEM™ 1.1 Development Board User’s Guide
DS70099B-page 28
FIGURE 3-2:
From this menu you can choose one of three demonstration modes:
• Data Acquisition Display mode
• Digital Signal Processing (DSP) Operations mode
• Dual Tone Multi-Frequency (DTMF) Generation mode
3.3.1.1
The Data Acquisition Display mode demonstrates the capability of the dsPIC30F
device to convert inputs from five different analog signal sources at varying sampling
rates.
Data Acquisition mode is initiated by pressing switch SW2. Figure 3-3 shows the
resulting display on the LCD.
FIGURE 3-3:
This display shows the values of the following analog signal sources:
• Potentiometers RP1-RP3
• Temperature Sensor U2:
• Frequency:
The 12-bit A/D converter on the dsPIC30F device is used to convert these analog input
sources.
To estimate the frequency of the generated sine-wave signal, the program converts and
buffers 256 samples of the signal on pin AN3 and then performs a Fast-Fourier
Transform (FFT) on the buffer. The A/D converter is interrupt driven to sample and
convert at an 8 kHz rate for this operation.
The program scans input pins AN4, AN5, AN6 and AN8 to sample and convert the
values of the temperature sensor and potentiometer signals and delivers one sample
of each of these signals to the LCD display.
The three potentiometers available on the dsPICDEM 1.1 Development Board,
RP1, RP2 and RP3, are connected to analog input pins AN6, AN4 and AN5,
respectively, on the dsPIC30F device.
Temperature sensor, TC1047A, is connected to the analog input pin, AN8, on the
dsPIC30F device.
A fundamental sinewave signal is generated by stepping the MCP41010 digital
potentiometer (U9) output at an 8 kHz rate. The analyzed frequency is displayed
on the LCD.
DATA ACQUISITION DISPLAY MODE
Advance Information
DEMO MENU OPTIONS
DATA ACQUISITION DISPLAY
F = 1000
RP1 = 1.67
RP3 = 2.62
MAIN
D
DSP O
DTMF G
ATA
– s1
A
PERATIONS
CQ
HZ
ENERATION
M
D
ENU
V
V
ISPLAY
T
EMP
RP2 = 2.95
O
PTIONS
= +23
– S2
– S3
– S4
DG
V
C
 2003 Microchip Technology Inc.