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One Channel Speech Controller
SNC15340
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1. 2. 3. 4. 5.
===================== CONTENTS =====================
INTRODUCTION............................................................................................................3 FEATURES ......................................................................................................................3 PIN ASSIGNMENT.........................................................................................................3 BLOCK DIAGRAM ........................................................................................................4 FUNCTION DESCRIPTIONS .......................................................................................4 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 OSCILLATOR ...............................................................................................................4 ROM ..........................................................................................................................4 RAM ..........................................................................................................................5 POWER DOWN MODE ..................................................................................................5 SAMPLING RATE COUNTER .........................................................................................5 I/O PORTS ...................................................................................................................5 PWM OUTPUT ............................................................................................................6 WATCH DOG TIMER....................................................................................................6 IR FUNCTION ..............................................................................................................6
6. 7. 8.
ABSOLUTE MAXIMUM RATING ..............................................................................6 ELECTRICAL CHARACTERISTICS .........................................................................7 APPLICATION CIRCUIT .............................................................................................8 8.1 8.2 GENERAL APPLICATION ...............................................................................................8 MOTOR APPLICATION ..................................................................................................9
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One Channel Speech Controller
SNC15340
AMENDENT HISTORY
Version Ver 1.0 Ver 1.1 Ver 1.2 Ver 1.3 Ver 1.4 Ver 1.5 Date Oct 30, 2007 May 28, 2008 June 10, 2008 June 23, 2008 August 25 2008 October 30,2008 First issue Update Application Circuit Refine Application Circuit Refine Application Circuit Refine Application Circuit Refine Application Circuit Description
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One Channel Speech Controller
SNC15340
1. INTRODUCTION
SNC15340 is a one-channel voice synthesizer IC with PWM direct drive circuit. It built in a 4-bit tiny controller with four 4-bit I/O ports. By programming through the tiny controller in SNC15340, 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 340 seconds voice capacity are provided (@6KHZ sample rate) Built in a 4-bit tiny controller I/O Port - Four 4-bit I/O ports P1, P2, P4 and P5 are provided. - The driving/sink current of P2 & P5 is up to 8mA/16mA - The IO pins P2.3 can be modulated with 38.5Khz carry signal to implement IR function. 128*4 bits RAM are provided Maximum 64k program ROM is provided 688K*12 shared ROM for voice data and program Readable ROM code data Built in one channel speech synthesizer 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
3. PIN ASSIGNMENT
Symbol P10~P13 P20~P23 P40~P43 P50~P53 Rosc BUO1 BUO2 RST VDDIO GNDIO CVDD CGND Test
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I/O I/O I/O I/O I/O I O O I I I I I I
Function Description I/O port 1: IO I/O port 2: IO I/O port 4: IO I/O port 5: IO Oscillation component connection pin PWM output 1 PWM output 2 RST=1 Reset Chip (Active H) Positive power supply for I/O Negative power supply for I/O Positive power supply for internal core Negative power supply for internal core Test pin
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SNC15340
4. Block Diagram
ROM
Program/Speech 688Kx12 bits Address Pointers/ STACK SRAM (128 nibbles) Timer ALU IO port 1 IO port 2 Timing Generator
OSC
Sampling Rate Counter
Watch Dog Timer PWM Circuit IO port 5
Voice Synthesizer IO port 4
5. FUNCTION DESCRIPTIONS 5.1 Oscillator
SNC15340 accepts RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follows.
VCC OSC
RC Oscillator
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5.2 ROM
SNC15340 contains a substantial 688K words (12-bit) internal ROM, which is shared by program and resource data. Program, voice and data are shared within this same 688K words ROM.
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SNC15340
5.3 RAM
SNC15340 contains 128 nibble RAM (128 x 4-bits). The 128 nibble RAM is divided into two pages (page 0 to page 1, 64 nibble RAM on each page). In our programming structure, users can use the instructions, PAGE n (n=0 to 1) to switch and indicate the RAM page. Besides, users can use direct mode, M0 ~ M63 in the data transfer type instructions, to access all 64 nibbles of each page.
5.4 Power Down Mode
"End" instruction makes the IC entering into Stop Mode will stop the system clock for power savings (<3uA @VDD=3V and <6uA @VDD=4.5V.) Any valid data transition (L H or H L) occurring on any IO pin can be used to start the system clock and return to normal operating 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 architecture yields a high-quality voice synthesis that sounds very close to its original source when played through the same amplifier and speaker circuitry.
5.6 I/O Ports
There are four 4-bit I/O ports P1, P2, P4, and P5. Any I/O can be individually programmed as either input pull low or output. Any valid data transition (H L or L H) of P1, P2, P4, and P5 can reactivate the chip when it is in power-down stage.
Port Data PAD Port Status Weak
To Internal Data Bus
Read Control
I/O Port Configuration Note: (1) Weak N-MOS can serve as pull-low resistor. (2) The driving/sink current of P2 & P5 is up to 8mA/16mA
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SNC15340
5.7 PWM Output
An PWM circuit is built-in SNC15340. The maximum resolution of PWM is 8 bits. Two huge output stage circuits are designed in SNC15340. With this advanced circuit, the chip is capable of driving speaker directly without external transistors.
BUO1 BUO2
PWM Output
5.8 Watch Dog Timer
SNC15340 built an internal WDT (Watch Dog Timer). This Watchdog timer would issue resets signal to this chip if it is not cleared before reaching terminal count (1sec). The watchdog timer is enabled at reset and cannot be disabled.
5.9 IR Function
P23 can be modulated with 38.5KHz square wave before sent out to P23 pin. The IR signal can be achieved by this modulated signal.
6. ABSOLUTE MAXIMUM RATING
Items Supply Voltage Input Voltage Operating Temperature Storage Temperature Symbol VDD-V VIN TOP TSTG Min -0.3 VSS-0.3 0 -55.0 Max 6.0 VDD+0.3 55.0 125.0 Unit. V V o C o C
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7. ELECTRICAL CHARACTERISTICS
Item Operating Voltage Standby current Operating Current Input current of P1, P2, P4, P5 Drive current of P1, P4 Sink Current of P1, P4 Drive current of P2, P5 Sink current of P2, P5 PWM current PWM current Oscillation Freq. Sym. Min. Typ. Max. Unit Condition VDD 2.4 3.0 5.5 V ISBY 3.0 uA VDD=3V, no load 6.0 VDD=4.5V, no load IOPR 300 uA VDD=3V, no load IIH 3.0 uA VDD=3V,VIN=3V IOD IOS IOD IOS IPP IPP FOSC 3 4 6 10 4 6 8 16 120 150 2.0 mA VDD=3V,VO=2.4V mA VDD=3V,VO=0.4V mA VDD=3V,VO=2.4V mA VDD=3V,VO=2.4V mA VDD=3V, Output 1K Sin wave. mA VDD=4.5V, Ouput 1K Sin wave. MHz VDD=3V
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SNC15340
8. APPLICATION Circuit 8.1 General application
It is suggested to add a capacitor (C1), 104, between VDD with GND to keep power stable with general application. And this capacitor is strongly suggested to be as close to the chip as possible. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
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SNC15340
8.2 Motor application
There are some suggestions about PCB layout when user use SNC15000 series IC with motor applications. (1) The capacitor C1 ! C8 (104) is strongly suggested to be as close to the chip as possible. (2) It had better let OSC components (R) get close to IC chip. (3) OSC components had better get far away large current applications. (4) Separate IC power path with large current application power path to avoid affect IC working by power drop from large current application. (5) R2 (10 L L)separate VDDIO and CVDD. (6) Let power cable thicker, especially for large current application. (7) C2 C3 C4 and C5 C6 C7 (104) are connected at the shell of motor, positive point and negative point of the motor. !
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One Channel Speech Controller
SNC15340
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