INTRODUCTION

SN69040B is a single chip voice/dual tone melody synthesizer IC with 4*32 LCD direct drive capability which contains two 4-bit I/O ports, two optional 4-bit output ports and a tiny controller. By programming through the tiny controller, user’s applications including LCD display, section combination, trigger modes, output status, voice/melody playing and other logic functions and then be easily implemented.

FEATURES

♦ Single power supply 2.4V - 5V

♦ Built in a tiny controller

♦ Two 4-bit I/O ports and two optional 4-bit output ports are provided

♦ Built in 40K*10 ROM

♦ 256*4 bits RAM for programming usage are provided

♦ 32*4 bits RAM for LCD display usage are provided

♦ Maximum 16k program ROM is provided

♦ Readable ROM code data

♦ Built in direct 4*32 LCD driver

♦ LCD 1/3 bias, 1/4 duty

♦ Built in a high quality speech synthesizer

♦ Adaptive playing speed from 2.5k-40kHz is provided

♦ Built in a dual tone melody generator

♦ Speech/Dual tone melody mixer is provided which SN69040B can play speech and dual tone melody simultaneously

♦ Fixed current D/A output is provided to drive external connected transistor for sound output

♦ PWM output is provided to drive external connected piezo buzzer