SNC332

Direct Drive Voice/Dual Tone Melody Controller

1 INTRODUCTION

SNC332 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 SNC332, 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

13 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

40K*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: 1.2

December 26, 2002

SNC332

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

40K

�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

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: 1.2

December 26, 2002

SNC332

Direct Drive Voice/Dual Tone Melody Controller

5 FUNCTION DESCRIPTIONS

5.1. Oscillator

SNC332 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.

OSC

VCC

RC Oscillator

5.2. ROM

SNC332 contains substantial 40K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 40K words ROM.

5.3. RAM

SNC332 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 SNC332 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 SNC332, any valid data transition (L H or H L)
occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC332 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: 1.2

December 26, 2002

SNC332

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.

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)

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

Ver: 1.2

December 26, 2002

SNC332

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

SNC332 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 SNC332. 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: 1.2

December 26, 2002

SNC332

Direct Drive Voice/Dual Tone Melody Controller

VCC

BUO1/VO

DAC output

PWM: A PWM (pulse width modulation) circuit is built-in SNC332. 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 SNC332.
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: 1.2

December 26, 2002

SNC332

Direct Drive Voice/Dual Tone Melody 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

- - 3.0 uA V

=3V, no load

Operating Current

OPR

- - 250 uA V

=3V, no load

Input current of
P1, P2, P3

- 3.0

10.0

uA V

=3V,V

=3V

Drive current of
P2, P3

- 4 - mA V

=3V,V

=2.4V

Sink Current of
P2, P3

- 6 - mA V

=3V,V

=0.4V

Drive current of
P2, P3

- 5 - mA V

=4.5V,V

=3.9V

Sink Current of
P2, P3

- 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: 1.2

December 26, 2002

SNC332

Direct Drive Voice/Dual Tone Melody Controller

DISCLAIMER

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The reader should not assume that this publication is error-free or that it will be
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information on offerings available. Integrated circuits sold by SONiX are covered by
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The application circuits illustrated in this document are for reference purposes only.
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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: 1.2

December 26, 2002

Электронный компонент: SNC332