GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
General Description
The GT9128A is a memory mapped segment-type LCD driver which has 128 patterns . It
can easily interface to microprocessor or microcontroller via a serial interface like accessing the
serial EEPROM. There are only three or four lines required for communication with the host
CPU.
Features
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
Operates on 2.4V to 5.25V
Lower power CMOS process.
Compact package. ( 7.0x7.0 mm2 square )
On chip built-in 256kHz oscillator
Serial EEPROM like access interface
Up to 4 common and 32 segment output.
Support 1/2,1/3, or 1/4 duty display.
Support 1/2 ,1/3 bias for LCD power display.
Programmable timer output for external control.
Selectable 2kHz or 4kHz base frequency output.
Power down mode to reduce power consumption.
Applications
Portable sets, cameras, telephones, radio, VCD players, DVD players, MP3 players, digital
recorder, home appliance and those applications using LCD display.
Typical Application Block Diagram
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
1
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Block Diagram
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
2
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Pin Assignment
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
3
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Pin Descriptions
Pad No
Pad Name
I/O
Function
1
CSB
I
Chip select input
2
DO
O
Data output
3
SK
I
Shift clock
4
DATA
I
Data input
5
VSS
--
Power ground
6, 7
NC
--
Not connection ( left open on application )
8
VLCD
I
Power input for LCD voltage divider
9
VDD
--
Power supply input
10
TOUT
O
Timer output
11, 12
BZ, BZB
O
2KHz or 4KHz frequency output pins
13~16
COM0~ COM 3
O
LCD common driver outputs
17~48
SEG0~SEG31
O
LCD segment driver outputs
Absolute Maximum Ratings ( Ta=25℃, VSS=0V )
Symbol
Parameter
VDD
Power Supply Voltage
VLCD
LCD Supply Voltage
TIN
Input voltage
TA
Operating Temperature
TSTG
Storage Temperature
Rating
Unit
-0.3 ~ 5.5
V
-0.3 ~ VDD
V
VSS – 0.3 ~ VDD+0.3
V
-20 ~ 75
O
-55 ~ +125
O
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
4
C
C
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
D.C. Characteristics ( Ta=25 OC, VSS=0V )
Symbol
Parameter
VDD
Operating Voltage
IDD
Operating Current
ISTB
Standby Current
VIL
Input Low Voltage
VIH
Input High Voltage
IOL
TOUT, BZ, BZB, DO
IOH
TOUT, BZ, BZB, DO
RPH
Pull-high Resistor
Test Condition
―
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
3V
―
LCD on
Power down mode
CSB, SK, DI, DO
CSB, SK, DI, DO
VOL=0.5V
VOL=1V
VOH=2.3V
VOH=4V
Min.
Typ.
2.4
―
―
―
―
―
150
300
0.1
0.3
0
0
2.0
2.4
0.5
1.5
-0.3
-0.5
30
―
―
―
―
1.873
4.71
-0.762
-1.09
50
Max. Unit
5.25
300
600
5
10
0.6
0.8
3.0
5.0
V
μA
μA
μA
μA
V
V
V
V
mA
mA
mA
mA
kΩ
―
―
―
―
100
A.C. Characteristics ( Ta=25 OC, VSS=0V )
Symbol
FSYS
FLCD
FBZ
TCS
TCLK
TR
TF
TSU
TH
TSU1
TH1
Parameter
System Clock
LCD Clock
Buzzer Frequency
CSB Pulse width
SK Pulse width
Rise time of SK
Fall time of SK
Data setup time to SK
Data hold time to SK
CSB setup time to SK
CSB hold time to SK
Test Condition
Min.
Typ.
On chip oscillator
On chip oscillator
On chip oscillator
―
―
―
―
―
256
FSYS / 1024
2.0 or 4.0
250
2.0
―
90% of VDD
10% of VDD
―
―
―
―
―
―
20
20
120
120
100
100
―
―
―
―
1.8/3.6
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
5
Max. Unit
―
―
2.4/4.8
―
―
―
―
―
―
―
―
kHz
Hz
kHz
ns
μs
ns
ns
ns
ns
ns
ns
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Timing Diagrams
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
6
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Display Buffer to LCD Segments Mapping
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
7
GT9128
Rev. 1.01
March 2003
GT9128
G-TIME Electronic Co., Ltd.
Segment-type 32x4 LCD Driver
Function Table & Descriptions
Function Listing
Operation
ID
Address
Data
Comments
Read
110
A5-A0
D0-D3
Read Data from the display RAM.
Write
101
A5-A0
D0-D3
Write Data to The RAM.
Command Write
100
See command operations
Command operations
Function
ID
Command Code
CHIP DISABLE
100
1000-01X0-X
OSC ENABLE 1
100
1000-10X0-X
OSC ENABLE 2
100
1001-01X0-X
LCD OFF
100
1010-1101-X
LCD ON
100
1010-1111-X
BIAS & DUTY
100
1010-xyz0-X
TONE OFF
100
1011-0000-X
TONE ON
100
1011-0010-X
TONE 2K
100
1011-0110-X
TONE 4K
100
1011-0100-X
BEEPER OFF
100
1011-1X10-X
BEEPER ON
100
1011-1X00-X
TIMER DIS
100
1100-1000-X
TIMER EN
100
1100-1001-X
CLR TIMER
100
1100-1011-X
TOUT DUTY
100
1100-110X-X
TOUT DUTY
100
1100-111X-X
TOUT 0.5
100
1100-0000-X
TOUT 1
100
1100-0001-X
TOUT 2
100
1100-0010-X
TOUT 4
100
1100-0011-X
TOUT 8
100
1100-0100-X
TOUT 16
100
1100-0101-X
TOUT 16K
100
1100-0110-X
TOUT 32K
100
1100-0111-X
Description
Turn off oscillator and LCD bias generator ( Default )
System oscillator enable 1
System oscillator enable 2
Turn off LCD bias generator
Turn on LCD bias generator
xy={0,1,2} : {1/2,1/3,1/4}duty; z={0,1}: {1/3,1/2}bias
Turn off tone outputs
Turn on tone outputs
Tone frequency, 2kHz
Tone frequency, 4kHz
Beeper disable
Beeper enable
Disable time base output
Enable time base output
Clear the contents of time base generator
TOUT 50/50 Duty
1/128 duty of TOUT ( not including TOUT 16K and 32K )
TOUT output 0.5Hz cycle
TOUT output 1Hz cycle
TOUT output 2Hz cycle
TOUT output 4Hz cycle
TOUT output 8Hz cycle
TOUT output 16Hz cycle
TOUT output 16kHz cycle
TOUT output 32kHz cycle
G-TIME Electronic Co., Ltd., reserves the right to change products or specifications without notice.
2003 G-TIME Electronic Co., Ltd., G-TIME is a trademark of G-TIME Electronic Co., Ltd.,
8
GT9128
Rev. 1.01
March 2003