SNC203
Direct Drive Speech Controller
================= CONTENTS ================
1.
2.
3.
4.
5.
5.1.
5.2.
5.3.
5.4.
5.5.
5.6.
5.7.
5.8.
6.
7.
8.
INTRODUCTION........................................................................................................2
FEATURES ..................................................................................................................2
BLOCK DIAGRAM ....................................................................................................3
PIN ASSIGNMENT.....................................................................................................3
FUNCTION DESCRIPTIONS ...................................................................................4
O
SCILLATOR
...............................................................................................................4
ROM ..........................................................................................................................4
RAM ..........................................................................................................................4
P
OWER
D
OWN
M
ODE
..................................................................................................4
S
AMPLING
R
ATE
C
OUNTERS
.......................................................................................4
E
VENT
M
ARK
..............................................................................................................5
I/O P
ORTS
...................................................................................................................5
DAC & PWM ............................................................................................................6
ABSOLUTE MAXIMUM RATING ..........................................................................8
ELECTRICAL CHARACTERISTICS .....................................................................8
APPLICATION CIRCUIT .........................................................................................9
DISCLAIMER .....................................................................................................................11
Ver: 1.1
1
June 8, 2005
SNC203
Direct Drive Speech Controller
1.
INTRODUCTION
SNC203 is a single channel voice synthesizer IC with PWM direct drive circuit. It
built-in a 4-bit tiny controller with one 4-bit I/O port. By programming through the tiny
controller in SNC203, 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
10 seconds voice capacity are provided (@6KHZ sample rate)
Built in a 4-bit tiny controller
Where P3.2, P3.3 can direct drive LED (8mA for driving, 16mA for sink)
One 4-bit I/O port is provided
32*4 bits RAM are provided
32K*10 ROM size are provided for voice data and program
Maximum 16K program ROM is provided
Readable ROM code data
Built in a high quality speech synthesizer
Adaptive playing speed from 2.5k-20kHz is provided
Built in a PWM Direct Drive circuit and a fixed current D/A output
8-level volume control for PWM Direct Drive output
System clock: 2MHz
Low Power Reset
Ver: 1.1
2
June 8, 2005
SNC203
Direct Drive Speech Controller
3.
Block Diagram
ROM
Program/Speech
32K×10 bits
Timing
Generator
Address Pointers/ STACK
SRAM (32 nibbles)
Timer
ALU
IO3
OSC
Sampling Rate Counter
Voice
Synthesizer
PWM
D/A
4.
PIN ASSIGNMENT
Symbol
P33 ~ P30
VDD
GND
RST
OSC
BUO1/VO
BUO2
I/O
I/O
P
P
I
O
O
O
Function Description
Bit3 ~ Bit0 of I/O port 3
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: 1.1
3
June 8, 2005
SNC203
Direct Drive Speech Controller
5.
FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC203 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
VCC
RC Oscillator
5.2. ROM
SNC203 contains substantial 32K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 32K words ROM.
5.3. RAM
SNC203 contains 32 nibbles RAM. The 32 nibbles RAM are divided into two pages
(page 0 and page 1, 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 1) 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 SNC203 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 SNC203, any valid data transition (L H or H L)
occurring on any IO pins of P3 will lead SNC203 back to normal operation mode.
5.5. Sampling Rate Counters
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
4
r
June 8, 2005
OSC
SNC203
Direct Drive Speech Controller
5.6. Event Mark
This is a new function for SNC203, it allows user to add a special mark in wave data by
the voice edit tool “CoolEdit”. 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.
5.7. I/O Ports
P3 is a 4-bit I/O ports. Any bit of P3 can be programmed as either input or output port
individually. Any valid data transition (H L or L H) of P3 can reactivate the chip
when the chip is in power-down mode.
Port Data
PAD
Port Status
Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P30~P33)
Note:
(1) Weak N-MOS’s can serve as pull-low resistors.
(2) The driving and sink current of P3.2 and P3.3 are enhance to be 8mA/16mA.
So user can direct to drive the LED through those two I/O pins.
Ver: 1.1
5
June 8, 2005
PCB设计
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