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SNC5A4
Two Channel Direct Drive Speech Controller
1 INTRODUCTION
SNC5A4 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 three 4-bit I/O ports. By programming through the tiny controller in SNC5A4, 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 120 seconds voice capacity are provided(@6KHZ sample rate) Built in a 4-bit tiny controller One 4-bit input port and three 4-bit I/O ports are provided 128*4 bits RAM are provided 384K*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
Ver: 1.2
1
November 26, 2002
SNC5A4
Two Channel Direct Drive Speech Controller
3 Block Diagram
ROM
Program/Speech 384Kx10 bits Address Pointers/ STACK SRAM (128 nibbles) Timer ALU IO1 IO2 Timing Generator
OSC
Sampling Rate Counter x 2
PWM D/A IO6
Voice Synthesizer IO3
4 PIN ASSIGNMENT
Symbol P13 ~ P10 P23 ~ P20 P33 ~ P30 P63 ~ P60 VDD GND RST OSC BUO1/VO BUO2 I/O I I/O I/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 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
Ver: 1.2
2
November 26, 2002
SNC5A4
Two Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS 5.1. Oscillator
SNC5A4 accept RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follow.
VCC
RC Oscillator
5.2. ROM
SNC5A4 contains substantial 384K words (10-bit) internal ROM. Program, voices and other data are shared with this same 384K words ROM.
5.3. RAM
SNC5A4 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 SNC5A4 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 SNC5A4, any valid data transition (L H or H L) occurring on any input port (P1) or IO ports (P2, P3 and P6) will lead SNC5A4 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
r
November 26, 2002
OSC
SNC5A4
Two Channel Direct Drive Speech Controller
5.6. I/O Ports
P1 is a 4-bit input port and P2/P3/P6 are three 4-bit I/O 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)
Note: weak N-MOS's can serve as pull-low resistors.
Ver: 1.2
4
November 26, 2002
SNC5A4
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
SNC5A4 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 SNC5A4. 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
SNC5A4
Two Channel Direct Drive Speech Controller
VCC
BUO1/VO 1K
DAC output PWM: A PWM (pulse width modulation) circuit is built-in SNC5A4. 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 SNC5A4. 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
Ver: 1.2
6
November 26, 2002
SNC5A4
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, P6 Sink Current of P2, P3, P6 Drive current of P2, P3, P6 Sink Current of P2, P3, 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 350 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
Ver: 1.2
7
November 26, 2002
Two Channel Direct Drive Speech Controller
SNC5A4
VDD TR1 VDD P 10 R OS C 0.1u F RS T P 12 P 11 TR2 TR6 TR10 TR14 TR5 TR9 TR13
TR3
TR7
TR11
TR15
S NC5A4
P 13 P 30 P 20 P 21 P 22 P 23
TR4
TR8
TR12
TR16
P 31 P 32 P 33
VDD
8 APPLICATION CIRCUIT
8050 1K
G ND
D/A Speaker Output 16 Scan Keys
VO 1
Ver: 1.2
8
November 26, 2002
SNC5A4
Two Channel Direct Drive Speech Controller
9 BONDING PAD
(0,0)
P10 P11 P12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
25 24
P63 RST GND
23
BUO1
P13 P20 P21 P22 P23 GND VDD P30 P31 P32 P33 P60 P61 P62
Note: The substrate MUST be connected to Vss in PCB layout.
Ver: 1.2
9
BUO2
OSC GND
VDD
November 26, 2002
SNC5A4
Two Channel Direct Drive Speech Controller
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Ver: 1.2
10
November 26, 2002
SNC5A4
Two Channel Direct Drive Speech Controller
GREEN VOICE
Ver: 1.2
11
November 26, 2002

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