SNC569

Two Channel Direct Drive Speech Controller

1 INTRODUCTION

SNC569 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, two 4-bit output ports and three
4-bit I/O ports. By programming through the tiny controller in SNC569, 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

31 seconds voice capacity are provided(@6KHZ sample rate)

Built in a 4-bit tiny controller

One 4-bit input port, two 4-bit output ports and three 4-bit I/O ports are provided

128*4 bits RAM are provided

96K*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

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

3 Block Diagram

IO1

IO2

IO3

IO4

IO5

Sampling Rate Counter

� 2

Timing

Generator

D/A

Timer

SRAM (128 nibbles)

ALU

Voice

Synthesizer

IO6

PWM

Address Pointers/ STACK

OSC

ROM

Program/Speech

96K

�10 bits

4 PIN ASSIGNMENT

Symbol

I/O Function Description

P13 ~ P10

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

P43 ~ P40

O Bit3 ~ Bit0 of Output port 4

P53 ~ P50

O Bit3 ~ Bit0 of Output port 5

P63 ~ P60

I/O Bit3 ~ Bit0 of I/O port 6

VDD

P Positive power supply

GND

P Negative power supply

RST

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

SNC569

Two Channel Direct Drive Speech Controller

5 FUNCTION DESCRIPTIONS

5.1. Oscillator

SNC569 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.

OSC

VCC

RC Oscillator

5.2. ROM

SNC569 contains substantial 96K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 96K words ROM.

5.3. RAM

SNC569 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 SNC569 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 SNC569, any valid data transition (L H or H L)
occurring on any input port (P1) or IO ports (P2, P3 and P6) will lead SNC569 back to
normal operation mode.

5.5. Sampling Rate Counters

Ver: 1.3

August 26, 2003

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.

SNC569

Two Channel Direct Drive Speech Controller

5.6. I/O Ports

P1 is a 4-bit input port, P2/P3/P6 are three 4-bit I/O ports and P4/P5 are two 4-bit
output 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 L H) of P1, P2, P3 and P6
can reactivate the chip when the chip is in power-down mode.

To Internal Data Bus

Read Control

PAD

Weak

Input Port Configuration (P10~P13)

Port Data

Port Status

To Internal Data Bus

Read Control

PAD

Weak

I/O Port Configuration (P20~P23, P30~P33, P60~P63)

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

PAD

weak

Port Data

Port Status

Output Port Configuration (P40~P43, P50~P53)

Note: All weak N-MOS's can serve as pull-low resistors.

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.

Mode

38.5KHZ

P33

PAD

"1"

5.8. DAC & PWM

SNC569 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 SNC569. 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.

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

Input data

Typical value of output current (mA)

0 0
1 3/127
...
N n*(3/127)
...
127 3

VCC

BUO1/VO

DAC output

PWM: A PWM (pulse width modulation) circuit is built-in SNC569. 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 SNC569. 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

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

6 ABSOLUTE MAXIMUM RATING

Items

Symbol

Min

Max

Unit.

Supply Voltage

-V -0.3 6.0

Input Voltage

-0.3 V

+0.3 V

Operating Temperature

0 55.0

Storage Temperature

STG

-55.0 125.0

7 ELECTRICAL CHARACTERISTICS

Item

Sym. Min. Typ. Max. Unit

Condition

Operating Voltage

2.4 3.0 5.5 V

Standby current

SBY

- 2.0

5.0

=3V , no load

=4.5V, no load

Operating Current

OPR

- 300

700

uA V

=3V , no load

=4.5V, no load

Input current of
P1, P2, P3, P6

- 3.0

10.0

uA V

=3V,V

=3V

Drive current of
P2, P3, P4, P5, P6

- 4 - mA V

=3V,V

=2.4V

Sink Current of
P2, P3, P4, P5, P6

- 6 - mA V

=3V,V

=0.4V

Drive current of
P2, P3, P4, P5, P6

- 5 - mA V

=4.5V,V

=3.9V

Sink Current of
P2, P3, P4, P5, P6

- 9 - mA V

=4.5V,V

=0.4V

Drive current of Buo1

100 120 - mA VDD=3V,Buo1=1.5V

Sink Current of Buo1

100 120 - mA VDD=3V,Buo1=1.5V

Drive Current of Buo2

100 120 - mA VDD=3V,Buo2=1.5V

Sink Current of Buo2

100 120 - mA VDD=3V,Buo2=1.5V

Oscillation Freq.

OSC

- 2.0 - MHz

=3V

IR Carrier Frequency

Fir

38.5

KHz Fosc=2MHz

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

9 APPLICATION CIRCUIT

D/A Speaker Output
32 Scan Keys

TR
1

TR
2

TR
3

TR
4

TR
5

TR
6

P1
0

TR
7

TR
8

TR
9

TR
1

TR
2

TR
3

P1
1

P1
2

P1
3

P2
0

P2
1

P2
2

P2
3

P4
0

P4
1

P4
2

P4
3

569

P3
0

P3
1

P3
2

P3
3

OS
C

VO
1

VD
D

RS
T

0.1uF

VD
D

Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of
SNC569 as possible.

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

10 BONDING PAD

P10

P11

P12

P13

P20

OSC

GND

BUO

VDD

UO2

GND

RST

P21

P22

P23

P30

P31

P32

P33

P40

P41

GND

VDD

P42

P43

P50

P51

P52

P53

P60

P61

P62

P63

(0.00,0.00)

SNC569

Note: The substrate MUST be connected to Vss in PCB layout.

Ver: 1.3

August 26, 2003

SNC569

Two Channel Direct Drive Speech Controller

11 DISCLAIMER

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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
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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
not advised of the possibility of damage, and on any theory of liability, arising out of 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
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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
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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: 1.3

August 26, 2003

Электронный компонент: SNC569