SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

1. INTRODUCTION

SNC735 is a 32mins two-channel speech/melody and 4-channel wave-table melody
voice chip. It based on reduced 16-bit fixed-point DSP architecture. SNC735 provides
user some necessary and efficient DSP instructions. Furthermore, SNC735 provide one
10-bit PWM and one 10-bit DA converter to driving speaker for speech/melody output.
User can select PWM or DA by programming DA/PWM control register, and only one
function can be active at the same time.

2. FEATURES

Power supply: 2.4V ~ 3.6V (for 2 battery application)

3.6V ~ 5.1V (for 3 battery application)

Built-in a 16-bit DSP (Very Light Structure)

Software-based voice/melody processing

Rich Function Instruction Set

System Clock

16MHz crystal or R-C type oscillator for system clock

0.25s real time clock is form 32768Hz crystal

8 MIPS CPU performance

I/O Ports:

16 I/O pins (P0.0~P0.15) and 8 input pins (P1.0~P1.7)

P0.15 with IR carrier signal

RAM size: 2K*16 bits

High performance program ROM: 32K*16 bits

Data ROM size: 224K*16 bits

Total ROM size: 256K*16 bits

Maximum program size: 64K word

8 Interrupt Sources

4 for Internal Timer (timer0, 1, 2 and RTC)

4 for External (P0.0~P0.3)

Two voice/melody channels

Three 8-bit timer with auto-reload function

Built in a 10-bit PWM Direct Drive circuit and a fixed current D/A output

Sampling Rate: 6KHz ~16KHz

Built-in software voice synthesizer (multiple bit-rate solution 2Kbps, 3.6Kbps, 5Kbps,
6Kbps, 8Kbps, 10Kbps, 12Kbps, 14Kbps, 16Kbps, 20Kbps, 24Kbps and 29Kbps
@8K sampling rate)

Built-in software melody synthesizer includes the dual-tone melody and 4-ch
wave-table melody.

Low Voltage Reset

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

3. PIN ASSIGNMENT

Symbol

I/O

Descriptions

P0.0 ~ P0.15

I/O I/O port 0

P1.0 ~ P1.7

I Input port 1

CVDD

I Positive power supply for core circuit

VDD

I Positive power supply

GND

I Negative power supply

BP0

O PWM output 1

BN0

O PWM output 2

O DA output

XIN

I High speed clock crystal input / RC-type oscillator input

XOUT

O High speed clock crystal output / RC-type oscillator input

LXIN

I Low speed clock crystal input

LXOUT

O Low speed clock crystal output

CKSEL

I Crystal/RC-type oscillator select for high speed clock

RST

I Chip reset

TEST

I For test only

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

4. ROM TABLE

The total ROM size is 256K words. But only 64K words ROM for programming.
And 32K words of all is the high speed program ROM. The high-low speed ratio is 1:16,
that is to say, if the instruction cycle is two clocks at high speed ROM, the instruction cycle
will down to 32 clocks at low speed ROM.

Hi-Speed ROM

(32K words)

0x000000

0x007FFF

Low-Speed program

ROM

(32K words)

0x008000

0x00FFFF

Data ROM

0x010000

0x03FFFF

Low-Speed Data ROM (224K words)

Total ROM size (256K words)

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

5. RAM TABLE

Total RAM size is 2K words, and one bank is 512 words. If user need playing voice
(2Kbps, 3.6Kbps, 12Kbps, dual-tone melody and 4-ch wave-table melody), the system
will reserve 1.5K words RAM size.

6. System Clock

The system clock source also can be selected from 16Mhz crystal or ROSC. For the
ROSC, user should connect two resistors in the pin "XIN" and "XOUT" instead of 16MHZ
crystal. Beside, the clock source select pin "CKSEL" also should be connected to VDD
for ROSC.

In order to get an accurate system clock by ROSC, the real time clock

source is recommended to connect a 32768HZ crystal for system clock
calibration.

Bank0

Bank1

Bank2

Bank3

Free for User

0x0000

0x01FF

0x0200

0x03FF

0x0400

0x05FF

0x0600

0x07FF

Reserved for

OS and Voice

Algorithm

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

7. I/O PORT

SNC735 provides one a 16-bit I/O port and an 8-bit input port for user application
(P0.0~P0.15, P1.0~P1.7). The input pull high resistor of each pin can be programmed by
Port Pull-High register. The direction of I/O port is selected by Port Direction register. The
Port0 (P0.0~P0.15) and Port1 (P1.0~P1.7) can wake the chip up from the stop mode and
watch mode. P0.15 can be modulated with a 38.5Khz carry signal to realize IR signal
transmission.

I/O Configuration of P0.0~P0.15

Input Port Configuration of Port 1 (P1.0~P1.7)

Pull-Up

Resister

Latch

PAD

to internal bus

Pull-Up

Select

In/Out

Control

In/Out

Control

Digital In

Pull-Up

Resister

PAD

Pull-Up

Select

Input Control

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

P0.15 Modulated with a carry signal

8. TIMER/COUNTER

SNC735 provides three 8 -bit timer/event counters (T0/T1/T2). Each timer is 8-bit binary
up-count timer with pre-scalar and auto-reload function. Timer 0 (T0) is used when voice
playing, so user should avoid to use T0.

9. DAC & PWM

To play out voices, SNC735 contains two different solutions, DAC and PWM, for the
users' applications. The user can choose one of these two solutions in his design. Only
one function can be activated at one time.

DAC: A 10-bit current type digital-to-analog converter is built-in SNC735. The
relationship between input digital data and output analog current is listed in the following
table. Also, the recommended application circuit is illustrated as follows.

Timer2

Overflow

P0.15

IREN

I/O Pad

Auto-reload

TnC (8-bit)

(system clock)/2*

Pre-scalar

Enable

8-bit Up

Counter

If equal, Time out

/2
/4
/8

/256

comparator

clear

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

Input data

Typical value of output current (mA)

3/1024

...

n*(3/1024)

...

1024

PWM: A PWM (pulse width modulation) circuit is built-in SNC735. PWM can convert
input digital data into pulse trains with suitable different pulse width. The maximum
resolution of PWM is 10 bits. Two huge output stage circuits are included in SNC735.
Both of them are capable of driving speaker directly. The recommended application
circuit is as follows.

DAC output

PWM output

SPEAKER

BP0

BN0

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

10. ABSOLUTE MAXIMUM RATINGS

Items

Symbol

Min

Max

Unit.

Supply Voltage

-V

-0.3

6.0

Input Voltage

GND-0.3

+0.3

Operating Temperature

-20.0

70.0

Storage Temperature

STG

-55.0

125.0

11. ELECTRICAL CHARACTERISTICS

Item

Sym. Min. Typ. Max. Unit

Condition

Operating Voltage

2.4

3.6

V *1.

3.6

5.1

V *2.

Standby current

SBY

2.0

uA V

=3V, no load

Operating Current

OPR

mA V

=3V, no load

Input current of P0, P1

10.0 uA V

=3V,V

=3V

Drive current of P0

mA V

=3V,V

=2.4V

Sink Current of P0

mA V

=3V,V

=0.4V

Drive current of Buo1

100 120

mA V

=3V,Buo1=1.5V

Sink Current of Buo1

100 120

mA V

=3V,Buo1=1.5V

Drive Current of Buo2

100 120

mA V

=3V,Buo2=1.5V

Sink Current of Buo2

100 120

mA V

=3V,Buo2=1.5V

Oscillation Freq. (crystal)

OSC

16.0

MHz V

=3V

Note:

1. For 2 battery application.
2. For 3 battery application, user should add 1 resister between power and CVDD pin

of chip.

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

The relationship between ROSC and voltage (Typical)
T

= 25

�

Frequency unit: MHz

The relationship between Frequency and Resister (R2) for ROSC (Typical)
T

= 25

�

C, R1 = 75K

Frequency unit: MHz

15.2

15.4

15.6

15.8

16.2

16.4

16.6

16.8

17.2

17.4

2.0 V

2.2 V

2.4 V

2.6 V

2.8 V

3.0 V

3.2 V

3.4 V

3.6 V

3.8 V

4.0 V

Voltage

Frequency

74K

82K

91K

100K

110K

120K

130K

Resister Value

Frequency

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

12. APPLICATION CIRCUIT

3V, 16MHz Crystal, PWM

Note:
1. All the "VDD" and "CVDD" should be connected together before connected to the

power source which with a 47uF(C4) capacitor.

2. The capacitor "C5" is near the "CVDD" pin.

C3 15p

LS1

SPEAKER

C4
47u

TR5

TR6

TR7

TR8

TR1

TR2

TR3

TR4

C5
4.7u

C6
0.1u

330

19
20
21
22

26
27
28

SNC735

VDD

CVDD

GND

RST

BP0
BN0

XIN

XOUT

LXIN

LXOUT

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

P0.8
P0.9

P0.10
P0.11
P0.12
P0.13
P0.14
P0.15

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

CKSEL

TEST

GND

VDD (3V)

VDD

R1
220K

C1
0.1u

RESET

16MHz

C2 15p

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

4.5V, 16MHz Crystal, PWM

Note:
1. All the "VDD" should be connected together before connected to the power source

which with a 47uF(C4) capacitor.

2. The capacitor "C5" is near the "CVDD" pin.

VDD (4.5V)

R1
220K

C1
0.1u

16MHz

15p

LS1

SPEAKER

C4
47u

TR5

TR6

TR7

TR8

TR1

TR2

TR3

TR4

C5
4.7u

C6
0.1u

330

360

VDD (4.5V)

19
20
21
22

26
27
28

SNC735

VDD

CVDD

GND

RST

BP0
BN0

XIN

XOUT

LXIN

LXOUT

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

P0.8
P0.9

P0.10
P0.11
P0.12
P0.13
P0.14
P0.15

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

CKSEL

TEST

GND

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

I/O and VDD 4.5V, CVDD 3V, 16MHz ROSC, DA output

Note:
1. All the "VDD" should be connected together before connected to the power source

which with a 47uF(C4) capacitor.

2. The capacitor "C5" is near the "CVDD" pin.

VDD

R1
220K

C1
0.1u

LS1

SPEAKER

47u

TR5

TR6

TR7

TR8

TR1

TR2

TR3

TR4

C5
4.7u

0.1u

BT1

BATTERY

BT2

BATTERY

4.5V

32768

15p

VR1

75K

VR2

100K

8050

R7
R

VDD

19
20
21
22

26
27
28

SNC735

VDD

CVDD

GND

RST

BP0
BN0

XIN

XOUT

LXIN

LXOUT

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

P0.8
P0.9

P0.10
P0.11
P0.12
P0.13
P0.14
P0.15

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

CKSEL

TEST

GND

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

13. BONDING PAD

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

XOUT

XIN

GND

VDD

LXOUT

LXIN

1
.
5

1
.
4

0
.
1

1
.
0

1
.
1

1
.
2

1
.
3

0
.
1

0
.
1
1

0
.
1

0
.
9

P0.8

P0.7

P0.6

P0.5

GND

VDD

P0.4

P0.3

P0.1

P0.0
TEST

CKSEL

VDD

GND

BN0

VDD

BP0

GND

P0.2

9
8

1
.
7

1
.
6

37 36 35

29 28 27 26 25 24 23 22 21 20

39 38

(0,0)

SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

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Электронный компонент: SNC735