DM300019 datasheet(38/50 Pages) MICROCHIP

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dsPICDEM™ 80-Pin Starter Development Board User’s Guide

DS51584B-page 34

4.1.1

RS-232 Serial Port

One RS-232 serial communication channel is provided on the board. This channel is

labeled J1. The dsPIC DSC or PIC24 MCU UART channel 1 U1RX and U1TX pins are

connected to an RS-232 level shifting MAX3232CD (U3), as shown in Figure A-3. The

serial port is configured as DCE and can be connected to a PC using a straight through

cable.

4.1.2

Analog Potentiometer

An analog potentiometer (R13) is connected to analog channel AN2 on the dsPIC DSC

or PIC24 MCU device. The voltage output range for the potentiometer is 0-5 VDC. The

voltage source is provided by the +5VAN regulator, as shown in Figure A-6.

4.1.3

Push Button Switches

Two push button switches (S1 and S2) are connected to port pin RA12 and RA13,

respectively, on the dsPIC DSC or PIC24 MCU device, as shown in Figure A-3. The

signal lines are normally pulled up to VDD through 4.7K resistors. Pressing the switch

shorts the line to ground. Port pins RA12 and RA13 are configured as input pins.

4.1.4

LED Indicators

Four LED indicators (D2 to D5) are connected to port pins RD4 to RD7, respectively,

on the dsPIC DSC or PIC24 MCU device. The anode of each LED is tied to VDD

through a 470 ohm resistor, as shown in Figure A-3. The cathodes are shorted and

connected to GND by an activation header (J4). The LEDs are labeled RD4 through

RD7 on the board to correspond to their respective port pins.

4.1.5

Digital Potentiometer

A single channel digital potentiometer (U2) is provided on the development board. The

MCP41010_SO150 digital potentiometer is controlled by the SPI2 communication

channel on the dsPIC DSC or PIC24 MCU device. The output of the digital

potentiometer is applied to a 2nd-order, low-pass filter, with a cutoff frequency of

approximately 4 kHz. The output of the LP filter is connected to the LINE OUT pin of

J9, as shown in Figure A-6.

4.1.6

Low-Pass Filter

A Microchip MCP6022_SO8 Operational Amplifier is configured as a 2nd-order,

low-pass filter for speech or voice input filtering, as shown in Figure A-6. The input to

the filter is at the LINE IN pin of J9.

4.1.7

ICD 2 Connector

By way of the modular connector ICD (J3), the MPLAB ICD 2 can be connected for

low-cost programming and debugging of the dsPIC DSC or PIC24 MCU device.

4.1.8

Device Header

Header P1 supports the processor adaptor boards. The processor adaptor boards

enable quick change out of the device.

4.1.9

I/O Port Header

Header P2 is a two-row header with appropriate labels for I/O ports. This header allows

the user to easily probe appropriate I/O lines.

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