INTEGRATED CIRCUITS
DATA SHEET
OM4068
LCD driver for low multiplex rates
Product specification
File under Integrated Circuits, IC12
1998 Jun 18
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
FEATURES
•
Single-chip LCD controller/driver
•
Static/duplex/triplex drive modes with up to
32/64/96 LCD segments drive capability per device
•
Selectable backplane drive configuration: static or
2 or 3 backplane multiplexing
•
Selectable display bias configuration drive: static,
1
⁄
2
or
1
⁄
3
•
32 segment drivers
•
Serial data input (word length 32 to 96 bits)
•
On-chip generation of intermediate LCD bias voltages
•
2 MHz fast serial bus interface
•
CMOS compatible
•
Compatible with any 4-bit, 8-bit or 16-bit
microprocessors/microcontrollers
•
May be cascaded for large LCD applications
•
Logic supply voltage range (V
DD
−
V
SS
) of 2.5 to 5.5 V
•
Display supply voltage range (V
LCD
−
V
SS
) of
3.5 to 6.5 V
•
Low power consumption, suitable for battery operated
systems
•
No external components needed by the oscillator
•
Manufactured in silicon gate CMOS process.
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
OM4068H
(1)
OM4068P
OM4068U/5
(2)
OM4068U
Notes
1. Gull Wing package.
2. For details see Chapter “Bonding pad locations”.
QFP44
DIP40
die
tray
DESCRIPTION
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
×
10
×
1.75 mm
plastic dual in-line package; 40 leads (600 mil)
unsawn wafer
chip in tray
APPLICATIONS
•
Telecom equipment
•
Portable instruments
•
Alarm systems
•
Automotive equipment.
GENERAL DESCRIPTION
OM4068
The OM4068 is a low-power CMOS LCD driver, designed
to drive Liquid Crystal Displays (LCDs) with low multiplex
rates. It generates the drive signals for any static or
multiplexed LCD containing up to three backplanes and up
to 32 segment lines and can be easily cascaded for larger
LCD applications. All necessary functions for the display
are provided in a single chip, including on-chip generation
of LCD bias voltages, resulting in a minimum of external
components and lower power consumption. A 3-line bus
structure enables serial data transfer with most
microprocessors/microcontrollers. All inputs are CMOS
compatible.
VERSION
SOT307-2
SOT129-1
−
−
1998 Jun 18
2
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
BLOCK DIAGRAM
OM4068
handbook, full pagewidth
BP1
BP2
BP3
SEG1 to SEG32
(1)
32
BACKPLANE OUTPUTS
4
M0
M1
LCD VOLTAGE
SELECTOR
(CONTROL LOGIC)
4
VLCD
BIAS
VOLTAGE
GENERATOR
SHIFT REGISTER
DISPLAY SEGMENT OUTPUTS
4
DISPLAY LATCH
SCE
SCLK
SDIN
SDOUT
OM4068
POWER-ON
RESET
TIMING
GENERATOR
OSCILLATOR
MBK817
VSS
VDD
(1) SEG1, SEG6, SEG15 and SEG25 are not available in DIP40 package.
Fig.1 Block diagram.
1998 Jun 18
3
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
PINNING
See notes 1 to 8.
PIN
SYMBOL
QFP44
V
LCD
V
DD
V
SS
M0
M1
SDIN
SCLK
SCE
SDOUT
BP1
BP2
BP3
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
1998 Jun 18
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
DIP40
19
20
21
22
23
24
25
26
27
28
29
30
−
31
32
33
34
−
35
36
37
38
39
40
1
2
−
3
4
5
6
7
8
9
10
11
−
12
4
LCD supply voltage
positive supply voltage
ground
drive mode select input 0
drive mode select input 1
serial bus data input
serial bus clock input
serial bus clock enable
serial bus data output
LCD backplane driver output 1
LCD backplane driver output 2
LCD backplane driver output 3
LCD segment driver output 1
LCD segment driver output 2
LCD segment driver output 3
LCD segment driver output 4
LCD segment driver output 5
LCD segment driver output 6
LCD segment driver output 7
LCD segment driver output 8
LCD segment driver output 9
LCD segment driver output 10
LCD segment driver output 11
LCD segment driver output 12
LCD segment driver output 13
LCD segment driver output 14
LCD segment driver output 15
LCD segment driver output 16
LCD segment driver output 17
LCD segment driver output 18
LCD segment driver output 19
LCD segment driver output 20
LCD segment driver output 21
LCD segment driver output 22
LCD segment driver output 23
LCD segment driver output 24
LCD segment driver output 25
LCD segment driver output 26
DESCRIPTION
OM4068
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
PIN
SYMBOL
QFP44
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
Notes
1. SEG1 to SEG32 (LCD segment driver outputs) output the multi-level signals for the LCD segments.
2. BP0, BP1 and BP2 (LCD backplane driver outputs) output the multi-level signals for the LCD backplanes.
3. V
LCD
(LCD power supply): power supply for the LCD.
4. SDIN (serial data line): input for the bus data line.
5. SCL (serial clock line): input for the bus clock line.
6. SDOUT (serial data output): output of the shift register to allow serial cascading of the OM4068 with other devices.
7. SCE (serial clock enable): input for enable/disable acquisition on the data input line. If disabled, data on the serial
bus are not accepted by the device.
8. M0 and M1 (display mode select inputs): inputs to select the LCD drive configurations; static, duplex or triplex.
42
43
44
1
2
3
DIP40
13
14
15
16
17
18
LCD segment driver output 27
LCD segment driver output 28
LCD segment driver output 29
LCD segment driver output 30
LCD segment driver output 31
LCD segment driver output 32
DESCRIPTION
1998 Jun 18
5
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