Direct Drive Voice/Dual Tone Melody Controller
SNC384
1 INTRODUCTION
SNC384 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 three 4-bit I/O
ports. By programming through the tiny controller in SNC384, 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
61 seconds voice capacity are provided (@6KHZ sample rate)
Built in a 4-bit tiny controller
One 4-bit input port and three 4-bit I/O ports are provided
128*4 bits RAM are provided
184K*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
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
3 Block Diagram
ROM
Program/Speech
184K×10 bits
Address Pointers/ STACK
Timing
Generator
OSC
-Tone
SRAM (128 nibbles)
Sampling
Rate Counter
Dual
Generator
PWM
Timer
ALU
Voice
Synthesizer
D/A
IO1
IO2
IO3
IO6
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
P63 ~ P60 I/O Bit3 ~ Bit0 of I/O port 6
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
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Direct Drive Voice/Dual Tone Melody Controller
FUNCTION DESCRIPTIONS
5
SNC384
5.1. Oscillator
SNC384 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
VCC
OSC
r
RC Oscillator
5.2. ROM
SNC384 contains substantial 184K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 184K words ROM.
5.3. RAM
SNC384 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 SNC384 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 SNC384, any valid data transition (LH or HL)
occurring on any input port (P1) or IO ports (P2, P3 and P6) will lead SNC384 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.
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
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/P6 are three 4-bit I/O ports. Any bit of P2, P3 and P6
can be programmed as either input or output port individually. Any valid data transition
(H L or LH) of P1, P2, P3 and P6 can reactivate the chip when the chip is in
power-down mode.
To Internal Data Bus
Read Control
Weak
PAD
Input Port Configuration (P10~P13)
Port Data
PAD
Port Status
Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P20~P23, P30~P33, P60~P63)
Note: weak N-MOS’s can serve as pull-low resistor.
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
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.
38.5KHZ
"1"
Mode
P33
PAD
5.9. DAC & PWM
SNC384 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 SNC384. 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
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
VCC
BUO1/VO
1K
DAC output
PWM: A PWM (pulse width modulation) circuit is built-in SNC384. 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 SNC384.
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
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
6 ABSOLUTE MAXIMUM RATING
Items Symbol Min Max Unit.
Supply Voltage VDD-V -0.3 6.0 V
Input Voltage VIN VSS-0.3 VDD+0.3 V
Operating Temperature TOP 0 55.0 oC
Storage Temperature T
-55.0 125.0 oC
STG
7 ELECTRICAL CHARACTERISTICS
Item Sym. Min. Typ. Max. Unit Condition
Operating Voltage VDD 2.4 3.0 5.5 V
Standby current I
Operating Current I
Input current of
P1, P2, P3, P6
Drive current of
P2, P3, P6
Sink Current of
P2, P3, P6
Drive current of
P2, P3, P6
Sink Current of
P2, P3, P6
Drive current of Buo1 IOD 100 120 - mA VDD=3V,Buo1=1.5V
Sink Current of Buo1 IOS 100 120 - mA VDD=3V,Buo1=1.5V
- - 3.0 uA VDD=3V, no load
SBY
- - 250 uA VDD=3V, no load
OPR
IIH - 3.0 10.0 uA VDD=3V,VIN=3V
IOD - 4 - mA VDD=3V,VO=2.4V
IOS - 6 - mA VDD=3V,VO=0.4V
IOD - 5 - mA VDD=4.5V,VO=3.9V
IOS - 9 - mA VDD=4.5V,VO=0.4V
Drive Current of Buo2 IOD 100 120 - mA VDD=3V,Buo2=1.5V
Sink Current of Buo2 IOS 100 120 - mA VDD=3V,Buo2=1.5V
Oscillation Freq. F
- 2.0 - MHz VDD=3V
OSC
IR Carrier Frequency Fir - 38.5 - KHz Fosc=2MHz
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SNC384
Direct Drive Voice/Dual Tone Melody Controller
8 APPLICATION CIRCUIT
D/A Speaker Output
16 Scan Keys
8050
VDD
1K
VDD
0.1u
F
VO 1
GND
P32
P33
P21
P22
P23
P30
P31
RST
SNC384
P12
P13
P20
TR4
TR8
TR1 2
R
OSC
P11
TR3
TR7
TR1 1
VDD
P10
TR2
TR6
TR1 0
TR1
TR5
TR9
TR1 6
TR1 5
TR1 4
TR1 3
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SNC384
Direct Drive Voice/Dual Tone Melody Controller
9 BONDING PAD
(0,0)
23
P10
P11
P12
P13
P20
P21
P22
1
2
3
4
5
7
8
OSC
GND
BUO1
VDD
131211109
GND
BUO2
22
21
20
19
18
17
16
15
14
RST
P63
P62
P61
P60
P33
P32
P31
P30
P23
Note: The substrate MUST be connected to Vss in PCB layout.
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
DISCLAIMER
The information appearing in SONiX web pages (“this publication”) is believed to be
accurate.
However, this publication could contain technical inaccuracies or typographical errors.
The reader should not assume that this publication is error-free or that it will be
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incidental, indirect or consequential damages of any kind, or any damages whatsoever,
including, without limitation, those resulting from loss of use, data or profits, whether or
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This publication was developed for products offered in Taiwan. SONiX may not offer
the products discussed in this document in other countries. Information is subject to
change without notice. Please contact SONiX or its local representative for
information on offerings available. Integrated circuits sold by SONiX are covered by
the warranty and patent indemnification provisions stipulated in the terms of sale only.
The application circuits illustrated in this document are for reference purposes only.
SONIX DISCLAIMS ALL WARRANTIES, INCLUDING THE WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PURPOSE. SONIX reserves the right
to halt production or alter the specifications and prices, and discontinue marketing the
Products listed at any time without notice. Accordingly, the reader is cautioned to
verify that the data sheets and other information in this publication are current before
placing orders.
Products described herein are intended for use in normal commercial applications.
Applications involving unusual environmental or reliability requirements, e.g. military
equipment or medical life support equipment, are specifically not recommended
without additional processing by SONIX for such application.
Ver: 1.2 December 26, 2002
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Direct Drive Voice/Dual Tone Melody Controller
SNC384
Ver: 1.2 December 26, 2002
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