DM300018 datasheet(17/115 Pages) MICROCHIP

17 / 115 page

Introduction

DS51558A-page 11

1.4.6

Reset Switch

This pushbutton switch (S1) is tied to the MCLR pin on the dsPIC30F device. It is used

to reset the device regardless of the socket used.

1.4.7

Device Clocking

Device clocking can be provided by on-chip RC oscillators, on-board crystal oscillators

or external sources. Crystal (Y1) provides a 7.3728 MHz oscillator for the motor control

device. Crystal (Y2) provides a 7.3728 MHz oscillator for the general purpose and

sensor devices.

1.4.8

Analog and Digital Inputs

The dsPICDEM™ 2 provides the following sensors that can be used to provide input

signals to your application program:

• Temperature sensor (U5)

• Potentiometer (R15)

• Pushbutton switches (S5 and S6)

1.4.8.1

TEMPERATURE SENSOR

The temperature sensor is a TC1047A that provides an analog signal to analog

channel AN3 in either the general purpose or motor control device via header H10.

1.4.8.2

ANALOG POTENTIOMETER

A 5-kOhm potentiometer provides an analog signal to analog channel AN2 in either the

general purpose or motor control device via header H13. The voltage source to the

potentiometer is provided by VR1, through a low-pass filter. VR1 is the main voltage

regulator for all components on the development board.

1.4.8.3

PUSHBUTTON SWITCHES

Two pushbutton switches, S5 and S6, are connected to external interrupt pins INT0 and

INT1, respectively, on the dsPIC30F device via headers H6 and H7, respectively.

1.4.9

Digital Outputs

The dsPICDEM™ 2 provides the following output devices that can be used to display

output information from your application program:

• LED Indicators (D3 and D4)

• LCD Display (LCD1/LCD2)

1.4.9.1

LED INDICATORS

LEDs D3 and D4 are connected to port pins RB0 and RB1, respectively on the installed

dsPIC DSC device via header H12. The LED anodes are tied to VDD through a 1.2K

resistor.

1.4.9.2

LCD DISPLAY

A 2 x 16 character dot matrix LCD display is provided on the development board. The

installed dsPIC30F device writes characters to the LCD via the clock (SCK1) and data

(SDO1) pins on the device’s SPI1 module.

1.4.10

External Connections

Prototyping areas H8 and H9 provide external connections from the motor control and

general purpose devices, respectively. These connections allow you to use hardware

and test equipment not provided on the dsPICDEM™ 2 board.

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