SNC520

SNC520 One Channel Direct Drive Speech Controller 1 INTRODUCTION SNC520 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 SNC520, 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: 1.0 1 November 26, 2002 3 Block Diagram SNC520 One Channel Direct Drive Speech Controller ROM Program/Speech 32K×10 bits Address Pointers/ STACK Timing Generator OSC SRAM (64 nibbles) Sampling Rate Counter PWM Timer ALU Voice Synthesizer D/A IO port 2 IO port 3 4 PIN ASSIGNMENT Symbol P23 ~ P20 P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O Function Description I/O Bit3 ~ Bit0 of I/O port 2 I/O Bit3 ~ Bit0 of I/O port 3 P Positive power supply P Negative power supply I Reset pin (active high) I Oscillator Input O Positive Outp...