SNC206

SNC206 Direct Drive Speech Controller ================= CONTENTS ================ 1. 2. 3. 4. 5. 5.1. 5.2. 5.3. 5.4. 5.5. 5.6. 5.7. 5.8. 6. 7. 8. INTRODUCTION........................................................................................................ 2 FEATURES .................................................................................................................. 2 BLOCK DIAGRAM .................................................................................................... 3 PIN ASSIGNMENT ..................................................................................................... 3 FUNCTION DESCRIPTIONS ................................................................................... 4 OSCILLATOR ............................................................................................................... 4 ROM .......................................................................................................................... 4 RAM .......................................................................................................................... 4 POWER DOWN MODE .................................................................................................. 4 SAMPLING RATE COUNTERS ....................................................................................... 4 EVENT MARK.............................................................................................................. 5 I/O PORTS ................................................................................................................... 5 DAC & PWM ............................................................................................................ 6 ABSOLUTE MAXIMUM RATING .......................................................................... 8 ELECTRICAL CHARACTERISTICS ..................................................................... 8 APPLICATION CIRCUIT ......................................................................................... 9 DISCLAIMER ..................................................................................................................... 11 Ver: 1.1 1 June 8, 2005 SNC206 Direct Drive Speech Controller 1. INTRODUCTION SNC206 is a single channel voice synthesizer IC with PWM direct drive circuit. It built-in a 4-bit tiny controller with one 4-bit I/O port. By programming through the tiny controller in SNC206, 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 20 seconds voice capacity are provided (@6KHZ sample rate) Built in a 4-bit tiny controller Where P3.2, P3.3 can direct drive LED (8mA for driving, 16mA for sink) One 4-bit I/O port is provided 32*4 bits RAM are provided 64K*10 ROM size are provided for voice data and program Maximum 16K program ROM is provided Readable ROM code data Built in a high quality speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided Built in a PWM Direct Drive circuit and a fixed current D/A output 8-level volume control for PWM Direct Drive output System clock: 2MHz Low Power Reset Ver: 1.1 2 June 8, 2005 SNC206 Direct Drive Speech Controller 3. Block Diagram ROM Program/Speech 64K×10 bits Timing Generator Address Pointers/ STACK SRAM (32 nibbles) Timer ALU IO3 OSC Sampling Rate Counter Voice Synthesizer PWM D/A 4. PIN ASSIGNMENT Symbol P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O I/O P P I O O O Function Description Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Reset pin (active high) Oscillator / Crystal Out Positive Output of PWM or DA output Negative Output of PWM Ver: 1.1 3 June 8, 2005 SNC206 Direct Drive Speech Controller 5. FUNCTION DESCRIPTIONS 5.1. Oscillator SNC206 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. VCC RC Oscillator 5.2. ROM SNC206 contains substantial 64K words (10-bit) internal ROM. Program, voices and other data are shared with this same 64K words ROM. 5.3. RAM SNC206 contains 32 nibbles RAM. The 32 nibbles RAM are divided into two pages (page 0 and page 1, 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 1) 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 SNC206 and enable IC to consume fewer current for power saving. (