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SN52020
2-Channel Speech Controller
========================== CONTENTS =========================== 1. 2. 3. 4. 5. INTRODUCTION............................................................................................................3 FEATURES ......................................................................................................................3 BLOCK DIAGRAM ........................................................................................................4 PIN ASSIGNMENT.........................................................................................................4 FUNCTION DESCRIPTIONS .......................................................................................5 5.1. 5.2. 5.3. 5.4. 5.5. 5.6. 5.7. 5.8. 5.9. 5.10. 5.11. 5.12. 6. 7. 8. 9. OSCILLATOR ...............................................................................................................5 ROM ..........................................................................................................................5 RAM ..........................................................................................................................5 POWER DOWN MODE..................................................................................................5 SAMPLING RATE COUNTERS .......................................................................................5 AUTO REPETITION .......................................................................................................6 WAVE MARK ..............................................................................................................6 PUSH-PULL OUTPUT ....................................................................................................6 VOLUME CONTROL FUNCTION....................................................................................6 WATCH DOG ...........................................................................................................7 I/O PORTS...............................................................................................................7 PULL-LOW RESISTER CONTROL..............................................................................7
ABSOLUTE MAXIMUM RATING ..............................................................................8 ELECTRICAL CHARACTERISTICS .........................................................................8 APPLICATION CIRCUIT .............................................................................................9 DISCLAIMER................................................................................................................11
Ver: 1.0
1
March 2,2005
SN52020
2-Channel Speech Controller
AMENDENT HISTORY
Version Ver 1.0 Ver 1.1 May 25,2005 Date First issue Add RST pin Description Description
Ver: 1.0
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March 2,2005
SN52020
2-Channel Speech Controller
1.
INTRODUCTION
SN52020 is a 20 seconds single chip 2-channel voice synthesizer IC which contains I/O pins and a tiny controller. By programming through the tiny controller, users' applications including section combination, trigger modes, output status, high performance melody, multiple voices, and other logic functions can be implemented.
2.
FEATURES
Single power supply 2.4V - 5.5V Built in a tiny controller 20 seconds voice capacity are provided 64*4 bits RAM are provided ROM Size - Maximum 64K*10 bits ROM size - 64K program ROM is provided Readable ROM code data I/O Ports - One 4-bit I/O ports P3 - The driving/sink current of P3.2 & P3.3 are 8mA/16mA Built in a high quality speech synthesizer Two independent voice channels Adaptive playing speed from 4k-40kHz is provided for all 2 channels individually A 6-bit*8-bit Multiplier is embed to modulate the volume of synthesized voices One digital mixers (with saturation control) are provided Built in an 8-level volume control Analog Push-Pull Direct Drive circuit. System clock: 2M Hz (RC-type or Crystal Option) Low Voltage Reset Built-in WDT function Built-in Event Mark Function
Ver: 1.0
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March 2,2005
SN52020
2-Channel Speech Controller
3.
Block Diagram
ROM
Program/Speech/Instrument waveform
Address Pointer PC/Data Pointer/Stack/Speech Pointer SRAM Timer ALU IO3
Timing Generator
OSC
Sampling Rate Push Pull WDT Voice Synthesizer
4.
PIN ASSIGNMENT
Symbol P33, P32, P31, P30 VDD GND OSC/XIN XOUT CKSEL I/O I/O I I I O I Function Description Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Oscillator / Crystal In Crystal Out / 1Khz output Clock type select `L' or floating RC oscillator `H' Crystal Positive Output of Push Pull Negative Output of Push Pull RST=1 Reset Chip (Active H)
BUO1 BUO2 RST
O O I
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SN52020
2-Channel Speech Controller
5.
FUNCTION DESCRIPTIONS
5.1. Oscillator
SN52020 series accepts crystal oscillator / ceramic resonator or RC type oscillator (selected by pin CKSEL) for system clock. The typical circuit diagrams for oscillator are listed as follows.
VDD VDD
SN52000
CKSEL OSC/XIN XOUT
15pf
SN52000
CKSEL OSC/XIN XOUT
2MHz
Crystal / Resonator
5.2. ROM
15pf
RC Oscillator
SN52020 contains 64K word (10-bit) internal ROM. Program, voices, melodies, data, and instrument waveforms share the same ROM with the others.
5.3. RAM
SN52020 series contains 64 nibble RAM. The 64 nibble RAM is separated into four pages (page 0, page1, page2 and page 3). An implicit page indicator is utilized to specify page address. Four instructions, PAGE0, PAGE1, PAGE2 and PAGE3, can switch the page indicator. All 16 nibbles of each page can be accessed by direct mode (to specify M0 ~ M15 in the data transfer type instructions.)
5.4. Power Down Mode
"End" instruction will let SN52020 enter power down mode and consumer very little amount of current. (<2uA @VDD=3V and <5uA @VDD=5V) After SN52020 enters power down mode, any valid data transition (L H or H L) occurring on any P3 IO ports would lead SN52020 back to normal operation mode.
5.5. Sampling Rate Counters
2 independent sampling rate counters are dedicated to 2 individual voice channels to play voices with different playing rates. The playing rate is programmable from 4KHz to 40KHz. The resolution of sampling period of each sampling rate counter is 0.25 uS. This feature helps SN52020 play sounds with accurate pitches in the case of music instrument synthesis.
Ver: 1.0
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March 2,2005
SN52020
2-Channel Speech Controller
5.6. Auto repetition
Auto repetition function helps SN52020 series realize a "looping" sound automatically by hardware without any software effort. Auto repetition function is a very useful mechanism to implement "Sustain" sound in instrument synthesis. All 2 channels are equipped with this function. Arbitrary lengths of looping sound are accepted by SN52020.
5.7. Wave Mark
This is a new function for SN52020 series, it allows user to add a special mark in wave data by the voice edit tool "CoolEdit" , "Goldwav" , "SoundForge" . User can insert event tags in anywhere of his wave file and can easy to get this special code to do his special action during voice playing. That means, it should be easily to control the I/O (such as LED or Motor) and other actions to synchronize with voice.
5.8. Push-Pull output
A Push-Pull Direct Drive circuit is built-in SN52020. The maximum resolution of Push-Pull is 8 bits (8 bit structure with LSB set to 0). Two huge output stage circuits are designed in SN52020. With this advanced circuit, the chip is capable of driving speaker directly without external transistors.
5.9. Volume Control Function
Bit0~Bit2 of VOL Register is applied to control the volume of voice. The relationship between output current and mode2 register is listed in the following table (power on set to 111). Bit3 of VOL register provide for VOL Output division 2. Bit2 0 0 0 0 1 1 1 1 Bit1 0 0 1 1 0 0 1 1 Bit0 0 1 0 1 0 1 0 1 Output Volume 46.5 DB 52.2 DB 58.1 DB 63.9 DB 70.3 DB 77.2 DB 82.3 DB 88.0 DB
Ver: 1.0
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SN52020
2-Channel Speech Controller
5.10. Watch Dog
The WDT is cascade after system timer. When user reset system timer will issue a clear signal to WDT also. It would issue a reset signal to chip if user doesn't reset any system timer before it reach terminate count (1 Second) when chip is in active mode.
5.11. I/O Ports
P3 is a 4-bit I/O port. Any bit of P3 can be programmed to be input or output individually. Any valid data transition (H L or L H) of P3 can reactivate the chip when it is in power-down stage.
Port D ata PAD Port Status W eak
Pull Low enable
To Internal Data Bus
Read C ontrol
I/O Port Configuration (P30~P33) Note: All weak N-MOS's can serve as pull-low resistors.
5.12. Pull-Low Resister Control
This function provides user to control Pull-Low register of all I/O ports that can be disabled by user command. With the help of this function, input floating and input pull low is supported.
Ver: 1.0
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March 2,2005
SN52020
2-Channel Speech Controller
6.
ABSOLUTE MAXIMUM RATING
Symbol VDD-V VIN TOP TSTG Min -0.3 VSS-0.3 0 -55.0 Max 6.0 VDD+0.3 55.0 125.0 Unit. V V o C o C
Items Supply Voltage Input Voltage Operating Temperature Storage Temperature
7.
ELECTRICAL CHARACTERISTICS
Sym. Min. Typ. Max. VDD 2.4 3.0 5.5 ISBY 2.0 IOPR 350 IOPR 4.4 Ii IOD IOS IOD IOS IBUD IBUS FOSC 3 4 6 8 16 80 80 2.0 Unit Condition V uA VDD=3V, no load uA VDD=3V, no load mA VDD=3V, Push-Pull turn on , no load uA VDD=3V mA VDD=3V,VO=2.4V mA VDD=3V,VO=0.4V mA VDD=3V,VO=2.4V mA VDD=3V,VO=0.4V mA VDD=3V,Buox=1.5V Sine wav Full Amplitude mA VDD=3V,Buox=1.5V Sine wav Full Amplitude MHz VDD=3V
Item Operating Voltage Standby Current Operating Current Operating Current Input Current of P30~P33 Drive Current of P30~P31 Sink Current of P30~P31 Drive Current of P32~P33 Sink Current of P32~P33 Drive current of Buo1/Buo2 Sink Current of Buo1/Buo2 Oscillation Freq.
Ver: 1.0
8
March 2,2005
SN52020
2-Channel Speech Controller
8.
APPLICATION CIRCUIT
System Clock: 2MHZ ROSC Keys: 2 direct Keys
VDD
330K OSC/XIN
BUO1 BUO2
XOUT
CKSEL
P33
P32
RST
VDD
SN52000
GND
GND P31 TR2 P30 TR1
VDD
Ver: 1.0
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March 2,2005
SN52020
2-Channel Speech Controller
System Clock: 2MHZ Crystal Keys: 2 direct Keys
15pf
15pf OSC/XIN XOUT
2MHz
VDD
P33
P32
CKSEL
RST
VDD
BUO1 BUO2
SN52000
GND GND P31 TR2 P30 TR1
VDD
Ver: 1.0
10
March 2,2005
SN52020
2-Channel Speech Controller
9.
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. In no event shall SONIX be liable for any special, incidental, indirect or consequential damages of any kind, or any damages whatsoever, including, without limitation, those resulting from loss of use, data or profits, whether or not advised of the possibility of damage, and on any theory of liability, arising out of or in connection with the use or performance of this publication or other documents which are referenced by or linked to this publication. This publication was developed for products offered in Taiwan. SONIX may not offer the products discussed in this document in other countries. Information is subject to change without notice. Please contact SONIX or its local representative for information on offerings available. Integrated circuits sold by SONIX are covered by the warranty and patent indemnification provisions stipulated in the terms of sale only. The application circuits illustrated in this document are for reference purposes only. 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: 1.0
11
March 2,2005

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