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SNC542 Dataheets PDF



Part Number SNC542
Manufacturers SONiX
Logo SONiX
Description Two Channel Direct Drive Speech Controller
Datasheet SNC542 DatasheetSNC542 Datasheet (PDF)

SNC542 Two Channel Direct Drive Speech Controller 1 INTRODUCTION SNC542 is a two-channel voice synthesizer IC with PWM direct drive circuit. It built-in a 4-bit tiny controller with one 4-bit input port and two 4-bit I/O ports. By programming through the tiny controller in SNC542, 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 16 seconds voice .

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SNC542 Two Channel Direct Drive Speech Controller 1 INTRODUCTION SNC542 is a two-channel voice synthesizer IC with PWM direct drive circuit. It built-in a 4-bit tiny controller with one 4-bit input port and two 4-bit I/O ports. By programming through the tiny controller in SNC542, 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 16 seconds voice capacity are provided(@6KHZ sample rate) Built in a 4-bit tiny controller One 4-bit input port and two 4-bit I/O ports are provided 128*4 bits RAM are provided 52K*10 ROM size are provided for voice data and program Maximum 16k program ROM is provided Readable ROM code data IR carrier signal is provided Built in a high quality speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided Two independent voice channels (Channel 1 + Channel 2→Buo1,Buo2) Built in a PWM Direct Drive circuit and a fixed current D/A output System clock : 2MHz Low Power Reset Ver: 1.2 1 November 26, 2002 3 Block Diagram SNC542 Two Channel Direct Drive Speech Controller ROM Program/Speech 52K×10 bits Address Pointers/ STACK Timing Generator OSC SRAM (128 nibbles) Sampling Rate Counter × 2 PWM Timer ALU Voice Synthesizer D/A IO1 IO2 IO3 4 PIN ASSIGNMENT Symbol P13 ~ P10 P23 ~ P20 P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O Function Description I Bit3 ~ Bit0 of Input port 1 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) O Oscillator / Crystal Out O Positive Output of PWM or DA output O Negative Output of PWM Ver: 1.2 2 November 26, 2002 SNC542 Two Channel Direct Drive Speech Controller 5 FUNCTION DESCRIPTIONS 5.1. Oscillator SNC542 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow. OSC VCC r RC Oscillator 5.2. ROM SNC542 contains substantial 52K words (10-bit) internal ROM. Program, voices and other data are shared with this same 52K words ROM. 5.3. RAM SNC542 contains 128 nibbles RAM. The 128 nibbles RAM are divided into eight pages (page 0 to page 7, 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 7) 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 SNC542 and enable IC to consume fewer current for power saving. (<3uA @VDD=3V and <5uA @VDD=5V) Please be aware that when the power down mode is activated in SNC542, any valid data transition (L H or H L) occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC542 back to normal operation mode. 5.5. Sampling Rate Counters 2 independent sampling rate counters are dedicated to 2 individual voice channels to be able to play diverse voices at different sample playing rates. The playing rate can be adaptively set up among from the wide ranges of 2.5KHz to 20KHz. This feature makes voice close to its original source and yield the better voice quality. Ver: 1.2 3 November 26, 2002 SNC542 Two Channel Direct Drive Speech Controller 5.6. I/O Ports P1 is a 4-bit input port and P2/P3 are two 4-bit I/O ports. Any bit of P2 and P3 can be programmed as either input or output port individually. Any valid data transition (H L or L H) of P1, P2 and P3 can reactivate the chip when the chip is in power-down mode. To Internal Data Bus PAD Read Control Weak Input Port Configuration (P10~P13) Port Data Port Status PAD Weak To Internal Data Bus Read Control I/O Port Configuration (P20~P23, P30~P33) Note: weak N-MOS’s can serve as pull-low resistors. Ver: 1.2 4 November 26, 2002 SNC542 Two Channel Direct Drive Speech Controller 5.7. IR Function P33 can be modulated with 38.5KHz square wave before sent out to P33 pin. The IR signal can be achieved by this modulated signal. 38.5KHZ "1" PAD Mode P33 5.8. DAC & PWM SNC542 is an advanced chip to be designed having two optimal methods to play out the voices. One is DAC and the other is PWM. Upon user’s applications, user can select either DAC or PWM in his design. Please be aware that only one method can be activated at a time. DAC: A 7-bit current type digital-to-analog converter is built-in SNC542. The relationship between input digital data and output analog current signal is listed in the following table. Also, the recommended application circuit is illustrated as follows. Input data 0 1 … N … 127 Typical value of output current (mA) 0 3/127 n*(3/127) 3 Ver: 1.2 5 November 26, 2002 SNC542 Two Channel Direct Drive Speech Controller VCC BUO1/VO 1K DAC output PWM: A PWM (pulse width modulation) circuit is built-in SNC542. PWM can convert input .


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