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SNC558
Two Channel Direct Drive Speech Controller
1 INTRODUCTION
SNC558 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, two 4-bit output ports and three 4-bit I/O ports. By programming through the tiny controller in SNC558, 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 One 4-bit input port, two 4-bit output ports and three 4-bit I/O ports are provided 128*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 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 2Buo1,Buo2) Built in a PWM Direct Drive circuit and a fixed current D/A output System clock : 2MHz Low Power Reset
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SNC558
Two Channel Direct Drive Speech Controller
3 Block Diagram
ROM
Program/Speech 64Kx10 bits Address Pointers/ STACK SRAM (128 nibbles) Timer ALU IO1 IO2 IO3 Timing Generator
OSC
Sampling Rate Counter x 2
PWM D/A
Voice Synthesizer IO4 IO5
IO6
4 PIN ASSIGNMENT
Symbol P13 ~ P10 P23 ~ P20 P33 ~ P30 P43 ~ P40 P53 ~ P50 P63 ~ P60 VDD GND RST OSC BUO1/VO BUO2 I/O I I/O I/O O O I/O P P I O O O Function Description Bit3 ~ Bit0 of Input port 1 Bit3 ~ Bit0 of I/O port 2 Bit3 ~ Bit0 of I/O port 3 Bit3 ~ Bit0 of Output port 4 Bit3 ~ Bit0 of Output port 5 Bit3 ~ Bit0 of I/O port 6 Positive power supply Negative power supply Reset pin (active high) Oscillator / Crystal Out Positive Output of PWM or DA output Negative Output of PWM
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SNC558
Two Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS 5.1. Oscillator
SNC558 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow.
VCC
RC Oscillator
5.2. ROM
SNC558 contains substantial 64K words (10-bit) internal ROM. Program, voices and other data are shared with this same 64K words ROM.
5.3. RAM
SNC558 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 SNC558 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 SNC558, any valid data transition (L H or H L) occurring on any input port (P1) or IO ports (P2, P3 and P6) will lead SNC558 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.
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OSC
SNC558
Two Channel Direct Drive Speech Controller
5.6. I/O Ports
P1 is a 4-bit input port, P2/P3/P6 are three 4-bit I/O ports and P4/P5 are two 4-bit output ports. Any bit of P2, P3 and P6 can be programmed as either input or output port individually. Any valid data transition (H L or L H) of P1, P2, P3 and P6 can reactivate the chip when the chip is in power-down mode.
PAD
To Internal Data Bus
Read Control
Weak
Input Port Configuration (P10~P13)
Port Data PAD Port Status Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P20~P23, P30~P33, P60~P63)
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SNC558
Two Channel Direct Drive Speech Controller
Port Data PAD Port Status
weak
Output Port Configuration (P40~P43, P50~P53) Note: All weak N-MOS's can serve as pull-low resistors.
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
SNC558 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 SNC558. 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.
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SNC558
Two Channel Direct Drive Speech Controller
Input data 0 1 ... N ... 127
Typical value of output current (mA) 0 3/127 n*(3/127) 3
VCC
BUO1/VO 1K
DAC output PWM: A PWM (pulse width modulation) circuit is built-in SNC558. PWM can convert input digital data into pulse trains with suitable different pulse width. The maximum resolution of PWM is 7 bits. Two huge output stage circuits are designed in SNC558. With this advanced circuit, the chip is capable of driving speaker directly without external transistors. The recommended application circuit is illustrated as follows.
BUO1/VO BUO2
PWM Output
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SNC558
Two Channel Direct Drive Speech Controller
6 ABSOLUTE MAXIMUM RATING
Items Supply Voltage Input Voltage Operating Temperature Storage Temperature 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
7 ELECTRICAL CHARACTERISTICS
Item Operating Voltage Standby current Operating Current Input current of P1, P2, P3, P6 Drive current of P2, P3, P4, P5, P6 Sink Current of P2, P3, P4, P5, P6 Drive current of P2, P3, P4, P5, P6 Sink Current of P2, P3, P4, P5, P6 Drive current of Buo1 Sink Current of Buo1 Drive Current of Buo2 Sink Current of Buo2 Oscillation Freq. IR Carrier Frequency Sym. Min. Typ. Max. Unit Condition VDD 2.4 3.0 5.5 V ISBY 3.0 uA VDD=3V, no load IOPR 300 uA VDD=3V, no load IIH 3.0 10.0 uA VDD=3V,VIN=3V IOD IOS IOD IOS IOD IOS IOD IOS FOSC Fir 100 100 100 100 4 6 5 9 120 120 120 120 2.0 38.5 mA VDD=3V,VO=2.4V mA VDD=3V,VO=0.4V mA VDD=4.5V,VO=3.9V mA VDD=4.5V,VO=0.4V mA VDD=3V,Buo1=1.5V mA VDD=3V,Buo1=1.5V mA mA MHz KHz VDD=3V,Buo2=1.5V VDD=3V,Buo2=1.5V VDD=3V Fosc=2MHz
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Two Channel Direct Drive Speech Controller
SNC558
VDD TR1 VDD P10 R OSC RST P12 P13 P30 P31 P32 P33
VDD
TR5
TR9
TR13
TR17
TR21
TR25
TR29
TR2
TR6
TR10
TR14
TR18
TR22
TR26
TR30
P11
TR3
TR7
TR11
TR15
TR19
TR23
TR27
TR31
SNC558
P20 P21 P22 P23 P40 P41 P42 VO1
8050 1K
TR4
TR8
TR12
TR16
TR20
TR24
TR28
TR32
8 APPLICATION CIRCUIT
GND
D/A Speaker Output 32 Scan Keys
P43
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SNC558
Two Channel Direct Drive Speech Controller
9 BONDING PAD
P63 P62 P61 P60 P53 P52 P51 P50 P43 P42 VDD GND
33 32 31 30 29 28 27 26 25 24 23 22
21 20 19 18 17 16 15 14 13 12 11
(0.00,0.00)
P41 P40 P33 P32 P31 P30 P23 P22 P21 P20 P13
P10 P11 P12
1 2 3 4 5 6 7 8 9 10
RST
Note: The substrate MUST be connected to Vss in PCB layout.
GND OSC
BUO1
9
VDD
BUO2
GND
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SNC558
Two Channel Direct Drive 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. 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: 1.4
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SNC558
Two Channel Direct Drive Speech Controller
GREEN VOICE
Ver: 1.4
11
June 8, 2005

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