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SNC510
One Channel Direct Drive Speech Controller
1 INTRODUCTION
SNC510 is a one-channel voice synthesizer IC with PWM direct drive circuit. It
built-in a 4-bit tiny controller with two 4-bit I/O ports. By programming through the tiny
controller in SNC510, 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
7 seconds voice capacity are provided(@6KHZ sample rate)
Built in a 4-bit tiny controller
Two 4-bit I/O ports are provided
64*4 bits RAM are provided
24K*10 ROM size are provided for voice data and program
Maximum 16k program ROM is provided
IR carrier signal is provided
Built in a high quality speech synthesizer
Adaptive playing speed from 2.5k-20kHz is provided
One voice channel
Built in a PWM Direct Drive circuit and a fixed current D/A output
System clock : 2MHz
Low Power Reset
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3 Block Diagram
Address Pointers/ STACK
SRAM (64 nibbles)
Timer
ALU
IO port 2
One Channel Direct Drive Speech Controller
ROM
Program/Speech
24K×10 bits
Sampling Rate Counter
Voice
Synthesizer
Timing
Generator
IO port 3
SNC510
OSC
PWM
D/A
4 PIN ASSIGNMENT
Symbol I/O Function Description
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 I Oscillator Input
BUO1/VO O Positive Output of PWM or DA output
BUO2 O Negative Output of PWM
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SNC510
One Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC510 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
SNC510 contains substantial 24K word (10-bit) internal ROM. Program and voices
are shared with this same 24K word ROM.
5.3. RAM
SNC510 contains 64 nibbles RAM. The 64 nibbles RAM are divided into four pages
(page 0 to page 3, 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 3) 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 SNC510 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 SNC510, any valid data transition (LH or HL)
occurring on any IO ports (P2 and P3) will lead SNC510 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.
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SNC510
One Channel Direct Drive Speech Controller
5.6. I/O Ports
P2 and 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
P2 and P3 can reactivate the chip when the chip is in power-down stage.
Port Data
PAD
Port Status
Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P20~P23, P30~P33)
Note: Weak N-MOS can serve as pull-low resistor.
5.7. DAC & PWM
SNC510 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 SNC510. 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.
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SNC510
One 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
1K
DAC output
PWM: A PWM (pulse width modulation) circuit is built-in SNC510. 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 SNC510. 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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SNC510
One Channel Direct Drive Speech Controller
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
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
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
SBY
OPR
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
-55.0 125.0 oC
STG
- - 3.0 uA VDD=3V, no load
- - 250 uA VDD=3V, no load
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
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8 APPLICATION CIRCUIT
8 050
VDD
1K
SNC510
One Channel Direct Drive Speech Controller
VDD
GND
0.1uF
VO 1
P32
P33
P30
P31
RST
R
OSC
VDD
SNC510
P20
P21
P22
P23
TR3
TR4
TR2
TR1
VDD
D/A Speaker Output
4 Direct Keys
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9 BONDING PAD
1
2
P32
P23
P31
OSC
P33
P21
RST
P20
SNC510
One Channel Direct Drive Speech Controller
15
14
P22
1
2
3
13
12
11
10
4
5
GND
Note: The substrate MUST be connected to Vss in PCB layout.
6
BUO
VDD
87
BUO
9
GND
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SNC510
One Channel Direct Drive Speech 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
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.
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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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GREEN VOICE
SNC510
One Channel Direct Drive Speech Controller
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