SNC115
One Channel Direct Drive Speech Controller
1 INTRODUCTION
SNC115 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 SNC115, 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
26 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
80K*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
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
3 Block Diagram
Input port 1
IO port 2
IO port 3
Sampling Rate Counter
Timing
Generator
D/A
Timer
SRAM (64 nibbles)
ALU
Voice
Synthesizer
PWM
Address Pointers/ STACK
OSC
ROM
Program/Speech
80K
10 bits
4 PIN ASSIGNMENT
Symbol
I/O Function Description
P13 ~ P10
I
Bit3 ~ Bit0 of Input port 1
P23 ~ P20
I/O Bit3 ~ Bit0 of I/O port 2
P33 ~ P30
I/O Bit3 ~ Bit0 of I/O port 3
VDD
P Positive power supply
GND
P Negative power supply
RST
I
Reset pin (active high)
OSC I
Oscillator
Input
BUO1/VO O
Positive
Output of PWM or DA output
BUO2
O Negative Output of PWM
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC115 accepts RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follows.
r
OSC
VCC
RC Oscillator
5.2. ROM
SNC115 contains substantial 80K word (10-bit) internal ROM. Program, voices and
other data are shared with this same 80K word ROM.
5.3. RAM
SNC115 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 SNC115 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 SNC115, any valid data transition (L H or H L)
occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC115 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.
Ver: 1.1
August 26, 2003
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SNC115
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.
To Internal Data Bus
Read Control
PAD
Weak
Input Port Configuration (P10~P13)
Port Data
Port Status
To Internal Data Bus
Read Control
PAD
Weak
I/O Port Configuration (P20~P23, P30~P33)
Note: All weak N-MOS's can serve as pull-low resistors.
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
5.7. DAC & PWM
SNC115 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 SNC115. 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
Typical value of output current (mA)
0 0
1 3/127
...
N n*(3/127)
...
127 3
VCC
BUO1/VO
1K
DAC output
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
PWM: A PWM (pulse width modulation) circuit is built-in SNC115. 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 SNC115. 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: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
6 ABSOLUTE MAXIMUM RATING
Items
Symbol
Min
Max
Unit.
Supply Voltage
V
DD
-V -0.3 6.0
V
Input Voltage
V
IN
V
SS
-0.3 V
DD
+0.3 V
Operating Temperature
T
OP
0 55.0
o
C
Storage Temperature
T
STG
-55.0 125.0
o
C
7 ELECTRICAL CHARACTERISTICS
Item
Sym. Min. Typ. Max. Unit
Condition
Operating Voltage
V
DD
2.4 3.0 5.5 V
Standby current
I
SBY
- 2.0
5.0
-
uA
V
DD
=3V , no load
V
DD
=4.5V, no load
Operating Current
I
OPR
- 300
700
-
uA V
DD
=3V , no load
V
DD
=4.5V, no load
Input current of
P1, P2, P3
I
IH
- 3.0
10.0
uA V
DD
=3V,V
IN
=3V
Drive current of
P2, P3
I
OD
- 4 - mA V
DD
=3V,V
O
=2.4V
Sink Current of
P2, P3
I
OS
- 6 - mA V
DD
=3V,V
O
=0.4V
Drive current of Buo1
I
OD
100 120 - mA VDD=3V,Buo1=1.5V
Sink Current of Buo1
I
OS
100 120 - mA VDD=3V,Buo1=1.5V
Drive Current of Buo2
I
OD
100 120 - mA VDD=3V,Buo2=1.5V
Sink Current of Buo2
I
OS
100 120 - mA VDD=3V,Buo2=1.5V
Oscillation Freq.
F
OSC
- 2.0 - MHz
V
DD
=3V
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
8 FOSC Performance
ROSC frequency vs VDD (Typical value, R=120K
)
1.5
2
2.5
3
2
3
4.5
5.5
VDD (Voltage)
Fosc (MHz)
120k
ROSC frequency vs. VDD (For various R)
1.5
2
2.5
3
2
3
4.5
5.5
VDD (Voltage)
Fosc (MHz)
100k
110k
120k
130k
150k
Ver: 1.1
August 26, 2003
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SNC115
One Channel Direct Drive Speech Controller
9 APPLICATION CIRCUIT
D/A Speaker Output
16 Scan Keys
G
N
D
TR
1
TR
2
TR
3
TR
4
TR
5
TR
6
P1
0
TR
7
TR
8
TR
9
TR
1
0
TR
1
1
TR
1
2
TR
1
3
TR
1
4
TR
1
5
TR
1
6
P1
1
P1
2
P1
3
P2
0
P2
1
P2
2
P2
3
P3
0
P3
1
P3
2
P3
3
OS
C
VO
1
V
D
D
1
K
8
0
5
0
R
VD
D
VD
D
S
N
C
115
RS
T
0.
1u
F
0.1uF
VD
D
C1
C2
Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of
SNC115 as possible.
Ver: 1.1
August 26, 2003
9
SNC115
One Channel Direct Drive Speech Controller
10 BONDING PAD
P10
P11
P12
P13
P20
P21
OSC
GN
D
BU
O
1
VD
D
BU
O
2
GN
D
P22
P23
P30
P31
P32
P33
RST
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
(0.00,0.00)
SNC115
Note: The substrate MUST be connected to Vss in PCB layout.
Ver: 1.1
August 26, 2003
10
SNC115
One Channel Direct Drive Speech Controller
Ver: 1.1
August 26, 2003
11
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