SNC26120
One Channel Speech Controller
===================== CONTENTS =====================
1.
2.
3.
4.
5.
INTRODUCTION............................................................................................................3
FEATURES ......................................................................................................................3
PIN ASSIGNMENT.........................................................................................................4
BLOCK DIAGRAM ........................................................................................................4
FUNCTION DESCRIPTIONS .......................................................................................5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
6.
7.
8.
O
SCILLATOR
...............................................................................................................5
ROM ..........................................................................................................................5
RAM ..........................................................................................................................6
P
OWER
D
OWN
M
ODE
..................................................................................................6
S
AMPLING
R
ATE
C
OUNTER
.........................................................................................6
I/O P
ORTS
...................................................................................................................6
PWM O
UTPUT
............................................................................................................7
W
ATCH
D
OG
T
IMER
....................................................................................................7
IR F
UNCTION
..............................................................................................................7
PWM IO
CONTROL
.....................................................................................................7
ABSOLUTE MAXIMUM RATING ..............................................................................7
ELECTRICAL CHARACTERISTICS .........................................................................8
APPLICATION CIRCUIT .............................................................................................9
8.1
8.2
G
ENERAL APPLICATION
...............................................................................................9
M
OTOR APPLICATION
................................................................................................10
Ver: 1.7
1
October 14, 2009
SNC26120
One Channel Speech Controller
AMENDENT HISTORY
Version
Ver 1.0
Ver 1.1
Ver 1.2
Ver 1.3
Ver 1.4
Date
Nov. 6, 2008
Nov. 17, 2008
Jan. 7, 2009
Feb. 13, 2009
May 6, 2009
First issue
Revise CVDD & VDDIO order of “Motor Application”
Revise SRAM information
1. Revise Rosc=220K Ohm in Application Circuit part
1. Revise frequency guarantee range in electrical
characteristics according IC Test flow
Ver 1.5
June 23, 2009
No modification, just revise version following with
updating SNC26500 IO numbers.
Ver 1.6
Ver 1.7
July 23, 2009
October 14, 2009
Revise system clock with 2.05MHz (typical).
1. Revise PWM output spec condition with BUOx=1/2
VDD (peak value), instead of 1KHz sine wave
Description
Ver: 1.7
2
October 14, 2009
SNC26120
One Channel Speech Controller
1. INTRODUCTION
SNC26120 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 and two 4-bit I/O ports. By
programming through the tiny controller in SNC26120, 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
120 seconds voice capacity are provided (@6KHZ sample rate)
Built in a 4-bit tiny controller
I/O Port
−
One 4-bit Input port P1is provided.
−
Two 4-bit I/O ports P2 and P3 are provided.
−
The driving/sink current of P2 & P3 is up to 8mA/16mA
−
The IO pins P2.3 can be modulated with 38.5Khz carry signal to implement IR
function.
−
PWM output for IO (P2.0~P2.3, P3.0~P3.3)
(64+16)*4 bits RAM are provided.
(Notes
: m0~m63 + 16 PWMIO duty registers)
Maximum 64k program ROM is provided
248K*12 shared ROM for voice data and program
Readable ROM code data
Voice Synthesizer:
−
Single channel speech output.
−
Support 4-bits SONiX-ASDPCM and 8-bit PCM algorithm
Adaptive playing speed from 2.5k-20kHz is provided
Built in an PWM circuit output, can directly connected to Speaker for sound
output.
System clock: 2MHz
Event Mark function supported
Low Power Detect.
Watch Dog Timer Supported
Ver: 1.7
3
October 14, 2009
SNC26120
One Channel Speech Controller
3. PIN ASSIGNMENT
Symbol
P10~P13
P20~P23
P30~P33
Rosc
BUO1
BUO2
RST
CVDD
CGND
VDDIO
GNDIO
Test
I/O
I
I/O
I/O
I
O
O
I
I
I
I
I
I
Function Description
Input port 1
I/O port 2: IO
I/O port 3: IO
Oscillation component connection pin
PWM output 1
PWM output 2
RST=1 Reset Chip (Active H)
Positive power supply for CPU
Negative power supply for CPU
Positive power supply for I/O
Negative power supply for I/O
Test pin
4.
Block Diagram
ROM
Program/Speech
248K×12 bits
Address Pointers/ STACK
SRAM
(64+16 nibbles)
Timer
ALU
Timing
Generator
OSC
Sampling Rate Counter
Watch Dog
Timer
PWM
Circuit
Voice
Synthesizer
PWM IO
Input port 1
IO port 2
IO port 3
Ver: 1.7
4
October 14, 2009
SNC26120
One Channel Speech Controller
5. FUNCTION DESCRIPTIONS
5.1 Oscillator
SNC26120 accepts RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follows.
VCC
OSC
RC Oscillator
5.2 ROM
SNC26120 contains a substantial 248K words (12-bit) internal ROM, which is shared
by program and resource data. Program, voice and data are shared within this same
248K words ROM.
Ver: 1.7
5
r
October 14, 2009
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