SNC21120A
1-CH H.Q. Speech Controller
===================== CONTENTS =====================
1.
2.
3.
4.
5.
INTRODUCTION........................................................................................................... 3
FEATURES ..................................................................................................................... 3
PIN ASSIGNMENT........................................................................................................ 4
BLOCK DIAGRAM ....................................................................................................... 4
FUNCTION DESCRIPTIONS ...................................................................................... 5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
6.
7.
8.
O
SCILLATOR
.............................................................................................................. 5
ROM ......................................................................................................................... 5
RAM ......................................................................................................................... 5
P
OWER
D
OWN
M
ODE
................................................................................................. 5
S
AMPLING
R
ATE
C
OUNTER
........................................................................................ 5
A
UTO
R
EPEAT
F
UNCTION
........................................................................................... 5
I/O P
ORTS
.................................................................................................................. 5
IR F
UNCTION
............................................................................................................. 6
W
ATCH
D
OG
T
IMER
................................................................................................... 6
P
USH
-P
ULL
O
UTPUT
................................................................................................... 7
E
VENT
M
ARK
............................................................................................................. 7
ABSOLUTE MAXIMUM RATING ............................................................................. 8
ELECTRICAL CHARACTERISTICS ........................................................................ 8
APPLICATION CIRCUIT ............................................................................................ 9
8.1
8.2
G
ENERAL APPLICATION
.............................................................................................. 9
M
OTOR APPLICATION
............................................................................................... 10
Ver1.1
1
April 28, 2009
SNC21120A
1-CH H.Q. Speech Controller
AMENDENT HISTORY
Version
Ver1.0
Ver1.1
Date
Description
First issue.
Revise system clock and electrical characteristics.
April 24, 2009
April 28, 2009
Ver1.1
2
April 28, 2009
SNC21120A
1-CH H.Q. Speech Controller
1. INTRODUCTION
SNC21120A is a one-channel voice synthesizer IC with Push-Pull direct drive circuit.
It built-in a 4-bit tiny controller with four 4-bit I/O ports. By programming through the
tiny controller in SNC21120A, 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
System Clock is 2MHz, the instruction cycle is 4us
120 seconds voice capacity are provided (@6KHZ sample rate)
Built in a 4-bit tiny controller
I/O Port
Four 4-bit I/O ports P1, P2, P3 and P6 are provided
The driving/sink current of P3.2 & P3.3 is up to 8mA/16mA
The IO pins P3.3 or P2.3 can be modulated with 38.5KHz carry signal to
implement IR function.
Without PWM IO
128*4 bits RAM are provided
Maximum 16k program ROM is provided
384K*10 shared ROM for voice data and program
Readable ROM code data
Built-in one channel High Quality speech synthesizer
Adaptive playing speed from 2.5k-20kHz is provided
Automatic repetition
Support 5-bit ADPCM and 10 bit PCM format.
Built in an 8-level volume control Push-Pull DAC circuit output, can directly
connected to Speaker for sound output.
12 bit Push-Pull DA output.
Event Mark function supported.
Low-Voltage Detect circuit
Watch Dog Timer Reset function.
Ver1.1
3
April 28, 2009
SNC21120A
1-CH H.Q. Speech Controller
3. PIN ASSIGNMENT
Symbol
P10~P13
P20~P23
P30~P33
P60~P63
RST
TEST
OSC
DAON
DAOP
VDDIO
GNDIO
VDD
GND
I/O
I/O
I/O
I/O
I/O
I
I
I
O
O
I
I
I
I
Function Description
I/O port 1: IO
I/O port 2: IO
I/O port 3: IO
I/O port 6: IO
Reset Chip (Active H)
Test Pin
Oscillation component connection pin
Push-Pull output 1
Push-Pull output 2
Positive power supply
Negative power supply
Positive power supply
Negative power supply
4. Block Diagram
ROM
Program/Speech
Address Pointers/ STACK
SRAM (128 nibbles)
Timing
Generator
OSC
Sampling Rate Counter Watch Dog
Timer
Voice
Synthesizer
Push-Pull
Circuit
IO port 6
Timer
ALU
IO port 1
IO port 2
IO port 3
Ver1.1
4
April 28, 2009
SNC21120A
1-CH H.Q. Speech Controller
5. FUNCTION DESCRIPTIONS
5.1 Oscillator
System clock define 2MHz, the source provided by external resistor ring oscillator.
5.2 ROM
SNC21120A contains a substantial maximum 384K words (10-bit) internal ROM,
which is shared by program and resource data. Program, voice and data are shared
within this same 384K words ROM.
5.3 RAM
SNC21120A contains maximum 128 nibble RAM (128 x 4-bits). The 128 nibble RAM
is divided into eight pages (page 0 to page 7, 16 nibble RAM on each page). In our
programming structure, users can use the instructions, PAGE n (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 makes the IC entering into Stop Mode will stop the system clock for
power savings (<3uA @VDD=3V and <6uA @VDD=4.5V.) Any valid data transition
(L H or H L) occurring on any IO pin can be used to start the system clock and
return to normal operating 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 architecture yields a
high-quality voice synthesis that sounds very close to its original source when played
through the same amplifier and speaker circuitry.
5.6 Auto Repeat Function
A voice section can be repeated by the built-in special hardware of SNC21120A
without any software effort. The function activated by setting the corresponding bit of
a control register. Once the control register was setting, the channel will continue to
play the voice section (the Next Section).
5.7 I/O Ports
There are four 4-bit I/O ports P1, P2, P3 and P6. Any I/O can be individually
programmed as either input pull low or output. Any valid data transition (H L or
L H) of P1, P2, P3 and P6 can reactivate the chip when it is in power-down stage.
Ver1.1
5
April 28, 2009
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