INTRODUCTION

SNC21040A is a one-channel voice synthesizer IC with Push-Pull direct drive circuit. It built-in a 4-bit tiny controller with three 4-bit I/O ports. By programming through the tiny controller in SNC21040A, user’s varied applications including voice section combination, key trigger arrangement, output control, and other logic functions can be easily implemented.

FEATURES

♦ Single power supply 2.4V – 5.5V

♦ System Clock is 2MHz, the instruction cycle is 4us

♦ 40 seconds voice capacity are provided (@6KHZ sample rate)

♦ Built in a 4-bit tiny controller

♦ I/O Port

► Three 4-bit I/O ports P1, P2 and P3 are provided

► The driving/sink current of P3.2 & P3.3 is up to 8mA/16mA

► The IO pins P3.3 or P2.3 can be modulated with 38.5Khz carry signal to implement IR function.

► Without PWM IO

♦ 80*4 bits RAM are provided

♦ Maximum 16k program ROM is provided

♦ 128K*10 shared ROM for voice data and program

♦ Readable ROM code data

♦ Built-in one channel High Quality speech synthesizer

♦ Adaptive playing speed from 2.5k-20kHz is provided

♦ Automatic repetition

♦ Support 5-bit ADPCM and 10 bit PCM format

♦ Built in an 8-level volume control Push-Pull Direct Drive circuit output, can directly connected to Speaker for sound output

♦ 12 bit Push-Pull DA output.

♦ Event Mark function supported

♦ Low-Voltage Detect circuit

♦ Watch Dog Timer Reset function.