INTRODUCTION
SNC21040 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 SNC21040, 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.
    ► PWM output for IO (P3.0~P3.3)
♦ 128*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
♦ Push-Pull DAC with 12 bits resolution (Direct Drive)
♦ Event Mark function supported
♦ Low-Voltage Detect circuit
♦ Watch Dog Timer Reset function.