Datasheet

dsPICDEM™ Development Board Hardware

4.1.10 Power Supply

The power supply furnishes +5V or +3.3V for the board (see the schematic in

Figure A-4). Source power is provided by a +9V, AC/DC wall adapter through Diode

Bridge CR1. An LM317 voltage regulator provides power (V

DD and AVDD) to the

respective processor pins and prototyping area. A ground trace connects all V

points.

4.1.11 Power-on Indicator

A red LED (D1) indicates the presence of power (see Figure A-4).

4.1.12 Oscillators

The board provides two crystal oscillators. Y1 operates at 7.37 kHz, and Y2 operates

at 32.768 kHz. A socket is provided for an external oscillator (Y3). The oscillator circuits

are shown in Figure A-4.

4.1.13 Reset Switch

The MCLR Reset switch (S3) connected to the processor MCLR pin provides a hard

reset to the dsPIC DSC or PIC24 MCU device.

4.1.14 Prototyping Area

A prototyping area and associated header is provided which enables additional ICs and

attachment boards to be added.

4.1.15 Sample Device

A sample part programmed with the demonstration code is included in the dsPICDEM

80-Pin Starter Development Board kit. The 80-pin TQFP is soldered onto an adapter

board that plugs into the device header connection (see Figure 4-2).

4.1.16 Line In/Out Connector (J9)

Pins provide line input and output connections for the low-pass filter, as shown in

Figure A-6.

• LINE_OUT – Output signal from digital potentiometer

• LINE_IN – Input signal for ADC

4.1.17 9 VDC Input Jack (J2)

An input jack for 9V external power supply.