SN6A297
LCD Controller with Voice/Dual Tone Melody
INTRODUCTION
SN6A297 is a single chip voice/dual tone melody synthesizer IC with 8*40 direct
drive capability which contains two 4-bit I/O ports, one 4-bit output port and a
tiny controller. By programming through the tiny controller, user’s application
including LCD display, section combination, trigger modes, output status,
voice/melody playing and other logic functions and then be easily implemented.
FEATURES
Single power supply 2.4V – 5.1V
Built in a tiny controller
Two 4-bit I/O ports are provided, one 4-bit output ports are provided
272*4 bits RAM for programming usage are provided (page0~15, m8~m15
of page18 and page21)
80*4 bits RAM for LCD display usage are provided
Maximum 108k*10 program ROM is provided
Readable ROM code data
Built in direct 8*40 LCD driver
LCD 1/4 bias; 1/4 duty
Built in a high quality speech synthesizer
Adaptive playing speed from 2.5k-40kHz is provided
Built in a dual tone melody generator
Speech/Dual tone melody mixer is provided which SN6A297 can play
speech and dual tone melody simultaneously
Fixed current D/A output is provided to drive external connected transistor
for sound output
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May 24, 2001
SN6A297
LCD Controller with Voice/Dual Tone Melody
PIN ASSIGNMENT
Symbol
SEG1-SEG40
COM8-COM1
GND
P23-P20
P33-P30
P43-P40
VO
RESET
OSC
TEST
XIN,XOUT
V
DD
VLCDR
VLC1, VLC2,
VLC3, VLC4
I
I/O
O
O
I
I/O
I/O
O
O
I
I
I
Function Description
Segment 1~40 for LCD driver.
Com8-Com1 for 8*40 LCD driver.
Negative power supply.
Bit 3 to bit 0 of IO port 2.
Bit 3 to bit 0 of IO port 3.
Bit 3 to bit 0 of IO port 4.
D/A current output.
Reset pin with internal pull low.
Oscillation component connection pin.
For testing only.
32768 Hz Crystal connection pins.
Positive power supply.
LCD voltage adjusting pin.
LCD voltage bias connection pins.
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May 24, 2001
SN6A297
LCD Controller with Voice/Dual Tone Melody
ABSOLUTELY MAXIMUM RATING
Items
Supply Voltage
Input Voltage
Operating Temperature
Storage Temperature
Symbol
V
DD
-V
V
IN
T
OP
T
STG
Min
-0.3
V
SS
-0.3
-20.0
-55.0
Max
6.0
V
DD
+0.3
70.0
125.0
Unit.
V
V
o
o
C
C
ELECTRICAL CHARACTERISTIC
Item
Sym. Min. Typ. Max. Unit
Condition
Operating
V
DD
2.4 3.0 5.1
V
Voltage
Standby current 1 I
SBY1
-
-
1.0
uA
V
DD
=3V,both system clk
and 32768 Hz clk are off
Standby current 2 I
SBY2
-
20
50
uA
V
DD
=3V, system clk is off,
32768 Hz clk is on for LCD
display and timer.
Operating
I
OPR
-
350 500
uA
V
DD
=3V, no load
current
Input current of
I
IH
-
3.0 10.0
uA
V
DD
=3V,V
IN
=3V
,P2,P3
Drive current
I
OD
-1.5
-2
-
mA
V
DD
=3V,V
O
=2.6V
of P2,P3,P4,P5
large Sink current I
OS1
2.0
3
-
mA
V
DD
=3V,V
O
=0.4V
of P2,P3,P4
Small Sink current I
OS2
-
0.4
-
uA
V
DD
=3V,V
O
=0.4V
of P2,P3,P4
D/A output current I
VO
2.0 3.0 4.0
mA
V
DD
=3V,V
O
=0.7V
Oscillation
R
-
330K -
Ω
V
DD
=3V
resistor
Oscillation Freq. F
OSC
-
1.0
-
MHZ V
DD
=3V
3
May 24, 2001
SN6A297
LCD Controller with Voice/Dual Tone Melody
APPLICATION CIRCUIT
Note:
1. LCD driving capacity: 1/4 duty, 1/4 bias
2. R1~R4 is the bias resisters.
3. R5 is by-pass resister, from 680KΩ~1KΩ.
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May 24, 2001
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