SNC26041 One Channel Speech Controller ===================== CONTENTS ===================== 1. INTRODUCTION............................................................................................................3 2. FEATURES ......................................................................................................................3 3. PIN ASSIGNMENT.........................................................................................................4 4. BLOCK DIAGRAM ........................................................................................................4 5. FUNCTION DESCRIPTIONS .......................................................................................5 5.1 5.2 OSCILLATOR ...............................................................................................................5 ROM ..........................................................................................................................5 5.3 5.4 RAM ..........................................................................................................................6 POWER DOWN MODE ..................................................................................................6 5.5 5.6 5.7 5.8 SAMPLING RATE COUNTER .........................................................................................6 I/O PORTS ...................................................................................................................6 PWM OUTPUT ............................................................................................................7 WATCH DOG TIMER ....................................................................................................7 5.9 5.10 IR FUNCTION ..............................................................................................................7 PWM IO CONTROL .....................................................................................................7 6. ABSOLUTE MAXIMUM RATING ..............................................................................7 7. ELECTRICAL CHARACTERISTICS .........................................................................8 8. APPLICATION CIRCUIT .............................................................................................9 8.1 8.2 Ver: 1.7 GENERAL APPLICATION ...............................................................................................9 MOTOR APPLICATION ................................................................................................10 1 October 14, 2009 SNC26041 One Channel Speech Controller AMENDENT HISTORY Version Date Description Ver 1.2 Jan. 7, 2009 First issue Ver 1.3 Feb. 13, 2009 1. Revise Rosc=220K Ohm in Application Circuit part Ver 1.4 May 6, 2009 1. Revise frequency guarantee range in electrical characteristics according IC Test flow Ver 1.5 June 23, 2009 No modification, just revise version following with updating SNC26500 IO numbers. Ver 1.6 July 23, 2009 Revise system clock with 2.05MHz (typical). Ver 1.7 October 14, 2009 1. Revise PWM output spec condition with BUOx=1/2 VDD (peak value), instead of 1KHz sine wave Ver: 1.7 2 October 14, 2009 SNC26041 One Channel Speech Controller 1. INTRODUCTION SNC26041 is a one-channel voice synthesizer IC with PWM direct drive circuit. It built in a 4-bit tiny controller with one 4-bit I/O ports. By programming through the tiny controller in SNC26041, 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 40 seconds voice capacity are provided (@6KHZ sample rate) Built in a 4-bit tiny controller I/O Port − One 4-bit I/O ports P2 is provided. − The driving/sink current of P2 is up to 8mA/16mA − The IO pins P2.3 can be modulated with 38.5Khz carry signal to implement IR function. − PWM output for IO (P2.0~P2.3) (64+8)*4 bits RAM are provided. (Notes : m0~m63 + 8 PWMIO duty registers) Maximum 64K program ROM is provided 84K*12 shared ROM for voice data and program Readable ROM code data Voice Synthesizer: − Single channel speech output. − Support 4-bits SONiX-ASDPCM and 8-bit PCM algorithm Adaptive playing speed from 2.5k-20kHz is provided Built in an PWM circuit output, can directly connected to Speaker for sound output. System clock: 2MHz Event Mark function supported Low Power Detect. Watch Dog Timer Supported Ver: 1.7 3 October 14, 2009 SNC26041 One Channel Speech Controller 3. PIN ASSIGNMENT Symbol P20~P23 Rosc BUO1 I/O I/O I O Function Description I/O port 2: IO Oscillation component connection pin BUO2 O RST I PWM output 2 RST=1 Reset Chip (Active H) CVDD I Positive power supply for CPU CGND I Negative power supply for CPU VDDIO GNDIO Test I I I Positive power supply for I/O Negative power supply for I/O Test pin PWM output 1 4. Block Diagram ROM Program/Speech 84K×12 bits Address Pointers/ STACK SRAM (64+8 nibbles) Timer ALU Timing Generator OSC Sampling Rate Counter Watch Dog Timer Voice Synthesizer PWM Circuit PWM IO IO port 2 Ver: 1.7 4 October 14, 2009 SNC26041 One Channel Speech Controller 5. FUNCTION DESCRIPTIONS 5.1 Oscillator SNC26041 accepts RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follows. VCC r OSC RC Oscillator 5.2 ROM SNC26041 contains a substantial 84K words (12-bit) internal ROM, which is shared by program and resource data. Program, voice and data are shared within this same 84K words ROM. Ver: 1.7 5 October 14, 2009 SNC26041 One Channel Speech Controller 5.3 RAM SNC26041 contains (64+8) nibble RAM <(64+8) x 4-bits>. The 64 nibble RAM is only one page. Another 8 nibbles are 8 PWMIO duty registers. In our programming structure, user can Directly use memory related command, M0 ~ M63 in the data transfer type instructions, to access first 64 nibbles. Another 8 nibbles, user can use PWMxL, PWMxH related command to access when PWMIO function is disabled. (x can be 1~4) 5.4 Power Down Mode “End” instruction makes the IC entering into Stop Mode will stop the system clock for power savings (<3uA @VDD=3V and <6uA @VDD=4.5V.) Any valid data transition (LH or HL) occurring on any IO pin can be used to start the system clock and return to normal operating mode. 5.5 Sampling Rate Counter The unique sampling rate counter is designed in voice channel 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 architecture yields a high-quality voice synthesis that sounds very close to its original source when played through the same amplifier and speaker circuitry. 5.6 I/O Ports There is one 4-bit I/O ports P2. Any I/O can be individually programmed as either input pull low or output. Any valid data transition (H L or LH) of P2 can reactivate the chip when it is in power-down stage. Port Data PAD Port Status Weak To Internal Data Bus Read Control I/O Port Configuration Note: (1) Weak N-MOS can serve as pull-low resistor. (2) The driving/sink current of P2 is up to 8mA/16mA Ver: 1.7 6 October 14, 2009 SNC26041 One Channel Speech Controller 5.7 PWM Output An PWM circuit is built-in SNC26041. The maximum resolution of PWM is 8 bits. Two huge output stage circuits are designed in SNC26041. With this advanced circuit, the chip is capable of driving speaker directly without external transistors. BUO1 BUO2 PWM Output 5.8 Watch Dog Timer SNC26041 built an internal WDT (Watch Dog Timer). This Watchdog timer would issue resets signal to this chip if it is not cleared before reaching terminal count (128 ms). The watchdog timer is enabled at reset and cannot be disabled. 5.9 IR Function P23 can be modulated with 38.5KHz square wave before sent out to P23 pin. The IR signal can be achieved by this modulated signal. 5.10 PWM IO control SNC26041 has support 4 PWM IO (P20~P23). Each I/O has 8 bit independent duty register, and the 8 bit register are compare with 8 bits counter. If set use PWM IO function and internal counter start at 000H, the mapping I/O will set High. The 8 bits counter increment if the same duty register, that will reset the mapping IO pin. 6. ABSOLUTE MAXIMUM RATING Items Supply Voltage Input Voltage Operating Temperature Storage Temperature Ver: 1.7 Symbol VDD-V VIN TOP TSTG Min -0.3 VSS-0.3 0 -55.0 7 Max 6.0 VDD+0.3 55.0 125.0 Unit. V V o C o C October 14, 2009 SNC26041 One Channel Speech Controller 7. ELECTRICAL CHARACTERISTICS Item Operating Voltage Standby current Sym. VDD ISBY Min. 2.4 - Operating Current Input current of P2 Drive current of P2 Sink current of P2 PWM current PWM current Oscillation Freq. IOPR IIH IOD IOS IPWM IPWM FOSC 6 10 1.98 Ver: 1.7 Typ. Max. Unit Condition 3.0 5.5 V 3.0 uA VDD=3V, no load 6.0 VDD=4.5V, no load 300 uA VDD=3V, no load 3.0 uA VDD=3V,VIN=3V 8 mA VDD=3V,VO=2.4V 16 mA VDD=3V,VO=2.4V 240 mA VDD=3V, BUOx=1.5V 310 mA VDD=4.5V, BUOx=2.25V 2.05 2.12 MHz VDD=3V, Temp.=25oC @Rosc = 220 Kohm Min : -3% Max : +3% 8 October 14, 2009 SNC26041 One Channel Speech Controller 8. APPLICATION Circuit 8.1 General application + IO1 IO2 IO3 IO4 Battery Box It is suggested to add a capacitor (C1), 104, between VDD with GND to keep power stable with general application. And this capacitor is strongly suggested to be as close to the chip as possible. Ver: 1.7 9 October 14, 2009 SNC26041 One Channel Speech Controller 8.2 Motor application Separate CPU power path with power path of large current application + 8050 IO1 IO2 Battery Box 8050 IO3 IO4 Separate CPU GND with large current application GND There are some suggestions about PCB layout when user use SNC26000 series IC with motor applications. (1) The capacitor C1 (104) C2 (104)is strongly suggested to be as close to the chip as possible. (2) It had better let OSC components (R) get close to IC chip. (3) OSC components had better get far away large current applications. (4) Separate IC power path with large current application power path to avoid affect IC working by power drop from large current application. (5) R2 (10Ω)separate VDDIO and CVDD. (6) Let power cable thicker, especially for large current application. (7) C3 and C4 (104) are connected at the positive point and negative point of the motor. Ver: 1.7 10 October 14, 2009 SNC26041 One Channel Speech Controller DISCLAIMER The information appearing in SONiX web pages (“this publication”) is believed to be accurate. However, this publication could contain technical inaccuracies or typographical errors. The reader should not assume that this publication is error-free or that it will be suitable for any particular purpose. SONiX makes no warranty, express, statutory implied or by description in this publication or other documents which are referenced by or linked to this publication. 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SONIX DISCLAIMS ALL WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PURPOSE. SONIX reserves the right to halt production or alter the specifications and prices, and discontinue marketing the Products listed at any time without notice. Accordingly, the reader is cautioned to verify that the data sheets and other information in this publication are current before placing orders. Products described herein are intended for use in normal commercial applications. Applications involving unusual environmental or reliability requirements, e.g. military equipment or medical life support equipment, are specifically not recommended without additional processing by SONIX for such application. Ver: 1.7 11 October 14, 2009