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: 1.4 1 June 8, 2005 SNC520 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 PWM or DA output Negative Output of PWM Ver: 1.4 2 June 8, 2005 SNC520 One Channel Direct Drive Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SNC520 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. VCC RC Oscillator 5.2. ROM SNC520 contains substantial 32K word (10-bit) internal ROM. Program and voices are shared with this same 32K word ROM. 5.3. RAM SNC520 contains 64 nibbles RAM. The 64 nibbles RAM are divided into four pages (page 0 to page 3, 16 nibble RAM on each page). In our programming structure, users can easily define and locate RAM page in the program. For instance, users can use the instructions, PAGEn (n=0 to 3) to switch and indicate the RAM page. Besides, users can use direct mode, M0 ~ M15 in the data transfer type instructions, to access all 16 nibbles of each page. 5.4. Power Down Mode “End” instruction will power down SNC520 and enable IC to consume fewer current for power saving. (