SNC698

4-Channel Speech Controller

======== CONTENTS ========

INTRODUCTION............................................................................................................... 3

FEATURES ....................................................................................................................... 3

BLOCK DIAGRAM ........................................................................................................... 4

PIN ASSIGNMENT ........................................................................................................... 4

FUNCTION DESCRIPTIONS............................................................................................ 5

5.1

SCILLATOR

................................................................................................................... 5

5.2

ROM.............................................................................................................................. 5

5.3

RAM .............................................................................................................................. 5

5.4

OWER

OWN

ODE

...................................................................................................... 5

5.5

AMPLING

ATE

OUNTERS

............................................................................................ 5

5.6

UTO

EPETITION

........................................................................................................... 6

5.7

I/O P

ORTS

...................................................................................................................... 6

5.8

IR F

UNCTION

.................................................................................................................. 7

5.9

BIT

DAC ...................................................................................................................... 7

5.10

BIT

PWM ..................................................................................................................... 8

ABSOLUTE MAXIMUM RATING ..................................................................................... 9

ELECTRICAL CHARACTERISTICS ................................................................................ 9

ROSC PERFORMANCE................................................................................................. 10

APPLICATION CIRCUIT ................................................................................................ 11

10.

BONDING PAD........................................................................................................... 13

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

1. INTRODUCTION

SNC698 is a 85 seconds single chip 4-channel voice synthesizer IC which contains 24
I/O pins and a tiny controller. By programming through the tiny controller, users'
applications including section combination, trigger modes, output status, high
performance melody, multiple voices, and other logic functions can be implemented.

2. FEATURES

Single power supply 2.4V � 5.5V

Built in a tiny controller

85 seconds voice capacity are provided

Six 4-bit I/O ports are provided

256*4 bits RAM are provided

Maximum 64k program ROM is provided

256K*12 ROM size is provided for voice data and program

Readable ROM code data

Built in a high quality speech synthesizer

Four independent voice channels

Adaptive playing speed from 4k-40kHz is provided for all 4 channels individually

Automatic repetition for every channel

A 6-bit*8-bit Multiplier is embed to modulate the volume of synthesized voices

Two digital mixers (with saturation control) are provided

Built in a PWM Direct Drive circuit and a current output DA converters.

Built in 15 levels PWM output volume control.

System clock: 8M Hz ( RC-type or Crystal Option)

Low Voltage Reset

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

3. Block Diagram

IO1

IO2

IO3

IO4

IO5

Sampling Rate Counter

� 4

Timing

Generator

Volume

Control

8bit D/A

Timer

SRAM (256 nibbles)

ALU

Voice

Synthesizer

IO6

PWM

Address Pointers/ STACK

OSC

ROM

Program/Speech/Melody/Instrument waveform

256K

�12 bits

4. PIN ASSIGNMENT

Symbol

I/O Function Description

P13 ~ P10

I/O Bit3 ~ Bit0 of I/O 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

I/O Bit3 ~ Bit0 of I/O port 4

P53 ~ P50

I/O Bit3 ~ Bit0 of I/O port 5

P63 ~ P60

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

VDD

P Positive power supply

GND

P Negative power supply

XIN I

Crystal

RST

Chip Reset (Active high)

XOUT/OSC

O Crystal Out / Rosc In

CKSEL

Clock type select (Internal pull low)
`L' or floating

RC oscillator

`H'

Crystal

BUO1/VO1

O Positive Output of PWM or DA1

BUO2/VO2

O Negative Output of PWM or DA2

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

5. FUNCTION DESCRIPTIONS

5.1 Oscillator

SNC698 accepts crystal oscillator / ceramic resonator or RC type oscillator (selected
by pin CKSEL) for system clock. The typical circuit diagrams for oscillator are listed as
follows.

CKS EL

VDD

XOUT/ROS C

XIN

CKS EL

XOUT/ROS C

XIN

100K

S NC 698

8MHZ Crystal

8M Rosc

5.2 ROM

SNC698 contains 256K words (12-bit) internal ROM. Program, voices, melodies, data,
and instrument waveforms share the same ROM with the others.

5.3 RAM

SNC698 contains 256 nibble RAM. The 256 nibble RAM is separated into four pages
(page 0, page1, page2 and page 3). An implicit page indicator is utilized to specify
page address. Four instructions, PAGE0, PAGE1, PAGE2 and PAGE3, can switch
the page indicator. All 64 nibbles of each page can be accessed by direct mode (to
specify M0 ~ M63 in the data transfer type instructions.)

5.4 Power Down Mode

"End" instruction will let SNC698 enter power down mode and consumer very little
amount of current. (<3uA @VDD=3V and <5uA @VDD=5V) After SNC698 enters
power down mode, any valid data transition (L H or H L) occurring on any IO ports
(P1 to P6) lead SNC698 back to normal operation mode.

5.5 Sampling Rate Counters

4 independent sampling rate counters are dedicated to 4 individual voice channels to
play voices with different playing rates. The playing rate is programmable from 4KHz
to 40KHz. The resolution of sampling period of each sampling rate counter is 0.25 uS.
This feature helps SNC698 play sounds with accurate pitches in the case of music
instrument synthesis.

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

5.6 Auto Repetition

Auto repetition function helps SNC698 realize a "looping" sound automatically by
hardware without any software effort. Auto repetition function is a very useful
mechanism to implement "Sustain" sound in instrument synthesis. All 4 channels are
equipped with this function. Arbitrary lengths of looping sound are accepted by
SNC698.

5.7 I/O Ports

P1 to P6 are six 4-bit I/O ports. Any bit of each I/O port can be programmed to be input
or output individually. Any valid data transition (H L or L H) of each I/O port can
reactivate the chip when it is in power-down stage.

Port Data

Port Status

To Internal Data Bus

Read Control

PAD

Weak

I/O Port Configuration

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

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech 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 8-bit DAC

An 8-bit current type digital-to-analog converter is built-in SNC698. The relationship
between of 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 3/255
...
N n*(3/255)
...
255 3

SNC698

VCC

D/A Speaker Application

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

5.10 8-bit PWM

A PWM (pulse width modulation) circuit is built-in SNC698. PWM can convert input
digital data into pulse trains with suitable different pulse width. The maximum
resolution of PWM is 8 bits. Two huge output stage circuits are included in SNC698.
Both of them are capable of driving speaker directly. Besides, 15 level PWM output
current is provided for volume adjust function.

# VOL[3..0]

Output

Current

(VDD=3V, Vo=1.5V)

0 0000

120mA

1 0001

105mA

2 0010

90mA

3 0011

75mA

4 0100

60mA

5 0101

52.5mA

6 0110

45mA

7 0111

37.5mA

8 1000

30mA

9 1001

22.5mA

A 1010

15mA

B 1011

10.25mA

C 1100

7.5mA

D 1101

3.75mA

E 1110

3.75mA

F 1111

0mA

15 levels PWM output current control

BUO1/VO

BUO2

PWM output

Ver: 1.2

August 26, 2003

SNC698

4-Channel 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
5

-
-

uA V

=3V

=4.5V

Operating Current
(ROSC Mode)

OPR

350

1.5

-
-

=3V, no load

=4.5V, no load

(ROSC Mode)

Operating Current
(XTAL Mode)

OPR

800

1.5

-
-

=3V, no load

=4.5V, no load

(XTAL Mode)

I/O port Input Current

10
30

uA V

=3V, V

=3V

=4.5V,V

=4.5V

I/O port Drive Current

1.5

2
5

-
-

mA V

=3V, V

=2.6V

=4.5V, V

=3.8V

I/O port Sink Current

3
8

-
-

mA V

=3V, V

=0.4V

=4.5V, V

=0.8V

D/A Output Current

3
3

4
4

mA V

=3V, V

=0.7V

=4.5V, V

=0.7V

Oscillation Freq.

OSC

- 8 - MHz

=3V

IR Carrier Frequency

Fir

38.5

KHz Fosc=8MHz

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

9. APPLICATION CIRCUIT

RC Oscillator, D/A Speaker Output, 32 Scan Keys

SN
C

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

P3
0

P3
1

P3
2

P3
3

OS
C

/
X

CK
S

VO
1

100K

VD
D

1u
F

RS
T

VDD

0.1uF

VD
D

Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of
SNC698 as possible.

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

Crystal Oscillator, PWM Speaker Output, 32 Scan Keys

698

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

P3
0

P3
1

P3
2

P3
3

CK
S

VD
D

GN
D

OS
C/
X

I
N

XO
U

20
p

8M
H

BU
O

1u
F

RS
T

VDD

0.1uF

VD
D

Note: The C1 (0.1uF) between Power and GND should be closed to VDD pin of
SNC698 as possible.

Ver: 1.2

August 26, 2003

SNC698

4-Channel Speech Controller

Ver: 1.2

August 26, 2003

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Электронный компонент: SNC698