SNC521

SNC521 One Channel Direct Drive Speech Controller 1 INTRODUCTION SNC521 is a one-channel voice synthesizer IC with PWM direct drive circuit. It built-in a 4-bit tiny controller with two 4-bit I/O ports. By programming through the tiny controller in SNC521, user’s varied applications including voice section combination, key trigger arrangement, output control, and other logic functions can be easily implemented. 2 FEATURES Single power supply 2.4V – 5.5V 10 seconds voice capacity are provided(@6KHZ sample rate) Built in a 4-bit tiny controller Two 4-bit I/O ports are provided 64*4 bits RAM are provided 32K*10 ROM size are provided for voice data and program Maximum 16k program ROM is provided IR carrier signal is provided Built in a high quality speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided One voice channel Built in a PWM Direct Drive circuit and a fixed current D/A output System clock : 2MHz Low Power Reset Ver: 1.3 1 August 26, 2003 SNC521 One Channel Direct Drive Speech Controller 3 Block Diagram ROM Program/Speech 32K×10 bits Address Pointers/ STACK SRAM (64 nibbles) Timer ALU IO port 2 Timing Generator OSC Sampling Rate Counter PWM D/A Voice Synthesizer IO port 3 4 PIN ASSIGNMENT Symbol P23 ~ P20 P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O I/O I/O P P I I O O Function Description Bit3 ~ Bit0 of I/O port 2 Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Reset pin (active high) Oscillator Input Positive Output of PW...