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Two Channel Direct Drive Speech Controller
SNC543
1 INTRODUCTION
SNC543 is a two-channel voice synthesizer 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 SNC543, 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
16 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
52K*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
Two independent voice channels (Channel 1 + Channel 2→Buo1,Buo2)
Built in a PWM Direct Drive circuit and a fixed current D/A output
System clock : 2MHz
Low Power Reset
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SNC543
3 Block Diagram
ROM
Program/Speech
52K×10 bits
Address Pointers/ STACK
Timing
Generator
OSC
SRAM (128 nibbles)
Sampling Rate Counter × 2
PWM
Timer
ALU
Voice
Synthesizer
D/A
IO1
IO2 IO3
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
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SNC543
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC543 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
SNC543 contains substantial 52K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 52K words ROM.
5.3. RAM
SNC543 contains 128 nibbles RAM. The 128 nibbles RAM are divided into eight
pages (page 0 to page 7, 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 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 SNC543 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 SNC543, any valid data transition (LH or HL)
occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC543 back to
normal operation mode.
5.5. Sampling Rate Counters
2 independent sampling rate counters are dedicated to 2 individual voice channels 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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5.6. 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 LH) of P1, P2 and P3 can reactivate the chip when the chip is in
power-down mode.
PAD
To Internal Data Bus
Read Control
Weak
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)
Note: weak N-MOS’s can serve as pull-low resistors.
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SNC543
5.7. 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
5.8. DAC & PWM
SNC543 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 SNC543. 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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Two Channel Direct Drive Speech Controller
VCC
BUO1/VO
1K
SNC543
DAC output
PWM: A PWM (pulse width modulation) circuit is built-in SNC543. 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 SNC543. 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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SNC543
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
Drive current of
P2, P3
Sink Current of
P2, P3
Drive current of
P2, P3
Sink Current of
P2, P3
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
- 2.0
SBY
5.0
- 300
OPR
700
- uA VDD=3V , no load
=4.5V, no load
V
DD
- uA VDD=3V , no load
=4.5V, no load
V
DD
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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Two Channel Direct Drive Speech Controller
8 ROSC Performance
ROSC frequency vs VDD (Typical value, R=120KΩ)
3
2.5
120k
2
ROSC (MHz)
1.5
234.55.5
VDD (Voltage)
ROSC frequency vs. VDD (For various R)
3
2.5
2
ROSC (MHz)
1.5
234.55.5
VDD (Voltage)
100k
110k
120k
130k
150k
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SNC543
Two Channel Direct Drive Speech Controller
9 APPLICATION CIRCUIT
D/A Speaker Output
16 Scan Keys
8050
VDD
P13
C2
0.1u
F
SNC543
P12
TR4
RST
1K
VO 1
GND
P32
P33
P21
P22
P23
P30
P31
P20
C1
0.1uF
R
OSC
P11
P10
TR3
TR2
VDD
VDD
VDD
TR1
TR8
TR1 2
TR1 6
TR7
TR1 1
TR1 5
TR6
TR1 0
TR1 4
TR5
TR9
TR1 3
Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of
SNC543 as possible.
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SNC543
10 BONDING PAD
P10
P11
P12
P13
P20
P21
OSC
19
(0.00,0.00)
1
2
3
4
5
6
7
89
GND
BUO1
10 11 12
VDD
18
17
16
15
14
13
BUO2
GND
RST
P33
P32
P31
P30
P23
P22
SNC543
Note: The substrate MUST be connected to Vss in PCB layout.
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Two Channel Direct Drive Speech Controller
SNC543
11 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
suitable for any particular purpose. SONiX makes no warranty, express, statutory
implied or by description in this publication or other documents which are referenced
by or linked to this publication. In no event shall SONiX be liable for any special,
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
not advised of the possibility of damage, and on any theory of liability, arising out of or
in connection with the use or performance of this publication or other documents which
are referenced by or linked to this publication.
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.
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Two Channel Direct Drive Speech Controller
SNC543
12 GREEN VOICE
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