SNC521 Datasheet | SONiX

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 bination, 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-20k Hz 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 August 26, 2003 One Channel Direct Drive Speech Controller 3 Block Diagram Program/Speech 32K×10 bits Address Pointers/ STACK SRAM (64 nibbles) Timer ALU IO port 2 Timing Generator 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 PWM or DA output Negative Output of PWM Ver: 1.3 August 26, 2003 One Channel Direct Drive Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SNC521 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. RC Oscillator 5.2. ROM SNC521 contains substantial 32K word (10-bit) internal ROM. Program and voices are shared with this same 32K word ROM. 5.3. RAM SNC521 contains 64 nibbles RAM. The 64 nibbles RAM are divided...