SNC323
Direct Drive Voice/Dual Tone Melody Controller
1 INTRODUCTION
SNC323 is a 1-channel voice synthesizer and dual-tone melody IC with PWM direct
drive circuit. It built-in a 4-bit tiny controller with one 4-bit input port and two 4-bit I/O
ports. By programming through the tiny controller in SNC323, user's varied
applications including voice section combination, dual-tone melody, 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
One 4-bit input port and two 4-bit I/O ports are provided
128*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
IR carrier signal is provided
Built in a high quality speech synthesizer
Adaptive playing speed from 2.5k-20kHz is provided
One voice channel plus Dual-Tone Melody
Built in a PWM Direct Drive circuit and a fixed current D/A output
System clock : 2MHz
Low Power Reset
Ver: 1.3
August 26, 2003
1
SNC323
Direct Drive Voice/Dual Tone Melody Controller
3 Block Diagram
Dual-Tone
Generator
IO1
IO2
IO3
Sampling
Rate Counter
Timing
Generator
D/A
Timer
SRAM (128 nibbles)
ALU
Voice
Synthesizer
PWM
Address Pointers/ STACK
OSC
ROM
Program/Speech
32K
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
O Oscillator / Crystal Out
BUO1/VO O
Positive
Output of PWM or DA output
BUO2
O Negative Output of PWM
Ver: 1.3
August 26, 2003
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SNC323
Direct Drive Voice/Dual Tone Melody Controller
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC323 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
r
OSC
VCC
RC Oscillator
5.2. ROM
SNC323 contains substantial 32K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 32K words ROM.
5.3. RAM
SNC323 contains 128 nibbles RAM. The 128 nibbles RAM are divided into eight
pages (page 0 to page 7, 16 nibbles 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 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 will power down SNC323 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 SNC323, any valid data transition (L H or H L)
occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC323 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: 1.3
August 26, 2003
3
SNC323
Direct Drive Voice/Dual Tone Melody Controller
5.6. Dual-Tone
Generator
A dual-tone melody generator is included to generate 2-channel music songs with a
pleasant square-wave-like timbre. The pitch range of each tone generator is as wide
as 4 octaves (48 different notes totally). The output of dual-tone generator can be
mixed with the output of voice synthesizer to achieve voice playing with BGM
(background music). Additionally, Sonix provides a numbered-musical-notation
representation to help users compose their songs. Further, a MIDI (1.0) file translator
can convert MIDI files into Sonix format.
5.7. I/O Ports
P1 is a 4-bit input port and P2/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.
Input Port Configuration (P10~P13)
To Internal Data Bus
Read Control
PAD
Weak
Port Data
Port Status
To Internal Data Bus
Read Control
PAD
Weak
I/O Port Configuration (P20~P23, P30~P33)
Note: weak N-MOS's can serve as pull-low resistor.
Ver: 1.3
August 26, 2003
4
SNC323
Direct Drive Voice/Dual Tone Melody Controller
5.8. IR
Function
P33 can be modulated with 38.5KHz square wave before sent out to P33 pin. The IR
signal can be achieved by this modulated signal.
Mode
38.5KHZ
P33
PAD
"1"
5.9. DAC & PWM
SNC323 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 SNC323. 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
Ver: 1.3
August 26, 2003
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