SNC201S
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: 1.2
1
Sept 20, 2007
SNC201S
Direct Drive Speech Controller
1.
INTRODUCTION
SNC201S 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 SNC201S, 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
3 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
10K*10 ROM size are provided for voice data and program
Maximum 10k 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 Detect
Ver: 1.2
2
Sept 20, 2007
SNC201S
Direct Drive Speech Controller
3.
Block Diagram
ROM
Program/Speech
10K×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: 1.2
3
Sept 20, 2007
SNC201S
Direct Drive Speech Controller
5.
FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC201S accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
VCC
OSC
RC Oscillator
5.2. ROM
SNC201S contains substantial 10K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 10K words ROM.
5.3. RAM
SNC201S 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 SNC201S 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 SNC201S, any valid data transition (L H
or H L) occurring on any IO pins of P3 will lead SNC201S 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: 1.2
4
r
Sept 20, 2007
SNC201S
Direct Drive Speech Controller
5.6. Event Mark
This is a new function for SNC201S, 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: 1.2
5
Sept 20, 2007
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