AN2400

Audio player evaluation board overview

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1

Audio player evaluation board overview

This evaluation board includes the following main components:

●

8-bit microcontroller: ST7FLITES2. However, the ST7Flite02 can also be used.

●

An external 8 MBit Serial Flash, M25P80 family

●

External components to build a low cost passive filter.

●

An audio amplifier (TDA7233)

●

3.3V low-cost voltage regulator

Figure 1.

Audio player evaluation board block diagram

The main features of the evaluation board are as follows:

●

Plays pre-recorded audio clips stored on an ST 8-Mbit serial Flash

●

Can play up to 15 different audio files

●

Easy to use Index and Play push-buttons

●

Power input 6V DC

●

Phone-quality sound: 8 kHz/8 bit

1.1

Instructions for use

Assuming the external Flash is already programmed with sounds, you need to:

1.

Power-on the board

2.

Connect the board to the speaker

3.

Select the desired sound by pressing the Index button. The File Index indicates the

sound to be played with the help of 4 LEDs.

4.

Push the Play Sound button.

5.

Adjust the volume potentiometer to your convenience.

ST7Lite02

DIP16

6th order

RC filter

Volume

Control

Power

Amplifier

External

Speaker

Connection

SPI

ZIF

Socket

Binary LED display

Power

Supply Circuit

External

Input

File Index

Play

Reset

TDA

7233

Voltage

Regulator

Serial

Flash