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One Channel Direct Drive Speech Controller
SNC10D
1 INTRODUCTION
SNC10D is a one-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 I/O ports. By
programming through the tiny controller in SNC10D, 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 – 5.1V
120 seconds voice capacity are provided(@6KHZ sample rate)
Built in a 4-bit tiny controller
One 4-bit input port, two 4-bit I/O ports are provided
64*4 bits RAM are provided
384K*10 ROM size are provided for voice data and program
Maximum 16k program ROM 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
Input port 1
One Channel Direct Drive Speech Controller
ROM
Program/Speech
384K×10 bits
Sampling Rate Counter
IO port 2 IO port 3
Timing
Generator
Voice
Synthesizer
SNC10D
OSC
PWM
D/A
4 PIN ASSIGNMENT
Symbol I/O Function Description
P13 ~ P10 I 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 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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One Channel Direct Drive Speech Controller
SNC10D
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC10D accepts RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follows.
VCC
OSC
r
RC Oscillator
5.2. ROM
SNC10D contains substantial 384K word (10-bit) internal ROM. Program, voices and
other data are shared with this same 384K word ROM.
5.3. RAM
SNC10D contains 64 nibble RAM. The 64 nibble RAM is 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 SNC10D 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 SNC10D, any valid data transition (LH or HL)
occurring on any input port (P1) or IO ports (P2 and P3) will lead SNC10D 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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One Channel Direct Drive Speech Controller
SNC10D
5.6. I/O Ports
P1 is a 4-bit input port, 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 P1, P2 and P3 can reactivate the chip when the chip is in
power-down mode.
PAD
To Internal Data Bus
Read Control
Weak
Input Port Configuration (P10~P13)
Port Data
PAD
Port Status
Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P20~P23, P30~P33)
Note: All weak N-MOS’s can serve as pull-low resistors.
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One Channel Direct Drive Speech Controller
SNC10D
5.7. DAC & PWM
SNC10D 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 SNC10D. 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
VCC
BUO1/VO
1K
DAC output
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One Channel Direct Drive Speech Controller
SNC10D
PWM: A PWM (pulse width modulation) circuit is built-in SNC10D. 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 SNC10D. 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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One Channel Direct Drive Speech Controller
SNC10D
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
-55.0 125.0 oC
STG
7 ELECTRICAL CHARACTERISTICS
Item Sym. Min. Typ. Max. Unit Condition
Operating Voltage VDD 2.4 3.0 5.1 V
Standby current I
Operating Current I
Input current of
P1, 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
- - 3.0 uA VDD=3V, no load
SBY
- - 250 uA VDD=3V, no load
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
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
8050
VDD
SNC10D
One Channel Direct Drive Speech Controller
GND
1K
VO1
P33
P32
P31
P30
0.1uF
RST
OSC
R
VDD
VDD
SNC10D
P10
P11
P12
P13
P20
P21
P22
P23
TR4
TR8
TR12
TR16
TR3
TR7
TR11
TR15
TR2
TR6
TR10
TR14
TR1
TR5
TR9
TR13
D/A Speaker Output
16 Scan Keys
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9 BONDING PAD
One Channel Direct Drive Speech Controller
SNC10D
(0,0)
P10
P11
P12
1
2
3
456789
P20
P21
P13
P23
P22
18
OSC
191615
GND
BUO1
10 11 12 13 20 21 22 23
GND
P30
VDD
14
P31
P33
P32
17
NCNCNC
Note: The substrate MUST be connected to Vss in PCB layout.
VDD
25
NC
24
RST
GND
BUO2
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One Channel Direct Drive Speech Controller
SNC10D
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