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SNC118
One Channel Direct Drive Speech Controller
1 INTRODUCTION
SNC118 is a one-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 I/O ports. By programming through the tiny controller in SNC118, 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 52 seconds voice capacity are provided(@6KHZ sample rate) Built in a 4-bit tiny controller One 4-bit input port, two 4-bit I/O ports are provided 64*4 bits RAM are provided 160K*10 ROM size are provided for voice data and program Maximum 16k program ROM is provided Built in a high quality speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided One voice channel Built in a PWM Direct Drive circuit and a fixed current D/A output System clock : 2MHz Low Power Reset
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SNC118
One Channel Direct Drive Speech Controller
3 Block Diagram
ROM
Program/Speech 160Kx10 bits Address Pointers/ STACK SRAM (64 nibbles) Timer ALU Input port 1 Timing Generator
OSC
Sampling Rate Counter
PWM D/A IO port 3
Voice Synthesizer IO port 2
4 PIN ASSIGNMENT
Symbol P13 ~ P10 P23 ~ P20 P33 ~ P30 VDD GND RST OSC BUO1/VO BUO2 I/O I I/O I/O P P I I O O Function Description Bit3 ~ Bit0 of Input port 1 Bit3 ~ Bit0 of I/O port 2 Bit3 ~ Bit0 of I/O port 3 Positive power supply Negative power supply Reset pin (active high) Oscillator Input Positive Output of PWM or DA output Negative Output of PWM
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SNC118
One Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS 5.1. Oscillator
SNC118 accepts RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follows.
VCC
RC Oscillator
5.2. ROM
SNC118 contains substantial 160K word (10-bit) internal ROM. Program, voices and other data are shared with this same 160K word ROM.
5.3. RAM
SNC118 contains 64 nibble RAM. The 64 nibble RAM is divided into four pages (page 0 to page 3, 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 3) 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 SNC118 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 SNC118, any valid data transition (L H or H L) occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC118 back to normal operation 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 feature makes voice close to its original source and yield the better voice quality.
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OSC
SNC118
One Channel Direct Drive Speech Controller
5.6. I/O Ports
P1 is a 4-bit input port, P2 and 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.
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) Note: All weak N-MOS's can serve as pull-low resistors.
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SNC118
One Channel Direct Drive Speech Controller
5.7. DAC & PWM
SNC118 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 SNC118. 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
VCC
BUO1/VO 1K
DAC output
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SNC118
One Channel Direct Drive Speech Controller
PWM: A PWM (pulse width modulation) circuit is built-in SNC118. 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 SNC118. 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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SNC118
One 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 Drive current of P2, P3 Sink Current of P2, P3 Drive current of Buo1 Sink Current of Buo1 Drive Current of Buo2 Sink Current of Buo2 Oscillation Freq. Sym. Min. Typ. Max. Unit Condition VDD 2.4 3.0 5.5 V ISBY 2.0 uA VDD=3V , no load 5.0 VDD=4.5V, no load IOPR 300 uA VDD=3V , no load 700 VDD=4.5V, no load IIH 3.0 10.0 uA VDD=3V,VIN=3V IOD IOS IOD IOS IOD IOS FOSC 100 100 100 100 4 6 120 120 120 120 2.0 mA VDD=3V,VO=2.4V mA VDD=3V,VO=0.4V mA VDD=3V,Buo1=1.5V mA VDD=3V,Buo1=1.5V mA VDD=3V,Buo2=1.5V mA VDD=3V,Buo2=1.5V MHz VDD=3V
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SNC118
One Channel Direct Drive Speech Controller
8 FOSC Performance
ROSC frequency vs VDD (Typical value, R=120K)
3
Fosc (MHz)
2.5 120k 2
1.5 2 3 4.5 5.5 VDD (Voltage)
ROSC frequency vs. VDD (For various R)
3
Fosc (MHz)
2.5
100k 110k 120k 130k 150k
2
1.5 2 3 4.5 5.5
VDD (Voltage)
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SNC118
One Channel Direct Drive Speech Controller
9 APPLICATION CIRCUIT D/A Speaker Output 16 Scan Keys
C1
VDD
VDD
8050 1K
C2
0.1uF
VDD
R
0.1uF RS T OS C
VDD
P 33
P 32
P 31
P 30
VO1
Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of SNC118 as possible.
GND
P 23
S NC118
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P 22
P 21
P 20
P 13
P 12 TR4 TR8 TR12 TR16
P 11 TR3 TR7 TR11 TR15
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P 10 TR2 TR6 TR10 TR14 TR1 TR5 TR 9 TR13
SNC118
One Channel Direct Drive Speech Controller
10
BONDING PAD
(0.00,0.00)
19 18 P10 P11 P12 P13 P20 P21 OSC 17 1 2 3 4 5 6 7 8 GND 9 BUO1 10 VDD 11 BUO2 12 GND 16 15 14 13
RST P33 P32 P31 P30 P23 P22
SNC118
Note: The substrate MUST be connected to Vss in PCB layout.
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August 26, 2003
SNC118
One Channel Direct Drive Speech Controller
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Ver: 1.1
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August 26, 2003

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