DATA SHEET
Product specification
File under Integrated Circuits, IC12
1998 Jun 18
INTEGRATED CIRCUITS
OM4068
LCD driver for low multiplex rates
1998 Jun 18
2
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
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.
APPLICATIONS
Telecom equipment
Portable instruments
Alarm systems
Automotive equipment.
GENERAL DESCRIPTION
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.
ORDERING INFORMATION
Notes
1. Gull Wing package.
2. For details see Chapter "Bonding pad locations".
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
OM4068H
(1)
QFP44
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
10
1.75 mm
SOT307-2
OM4068P
DIP40
plastic dual in-line package; 40 leads (600 mil)
SOT129-1
OM4068U/5
(2)
die
unsawn wafer
-
OM4068U
tray
chip in tray
-
1998 Jun 18
3
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MBK817
BACKPLANE OUTPUTS
OM4068
LCD VOLTAGE
SELECTOR
(CONTROL LOGIC)
BP2
BP1
BP3
SEG1 to SEG32
(1)
DISPLAY SEGMENT OUTPUTS
TIMING
GENERATOR
VSS
VDD
DISPLAY LATCH
OSCILLATOR
BIAS
VOLTAGE
GENERATOR
POWER-ON
RESET
4
4
M0
M1
VLCD
32
4
SHIFT REGISTER
SCE
SCLK
SDIN
SDOUT
(1) SEG1, SEG6, SEG15 and SEG25 are not available in DIP40 package.
1998 Jun 18
4
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
PINNING
See notes 1 to 8.
SYMBOL
PIN
DESCRIPTION
QFP44
DIP40
V
LCD
4
19
LCD supply voltage
V
DD
5
20
positive supply voltage
V
SS
6
21
ground
M0
7
22
drive mode select input 0
M1
8
23
drive mode select input 1
SDIN
9
24
serial bus data input
SCLK
10
25
serial bus clock input
SCE
11
26
serial bus clock enable
SDOUT
12
27
serial bus data output
BP1
13
28
LCD backplane driver output 1
BP2
14
29
LCD backplane driver output 2
BP3
15
30
LCD backplane driver output 3
SEG1
16
-
LCD segment driver output 1
SEG2
17
31
LCD segment driver output 2
SEG3
18
32
LCD segment driver output 3
SEG4
19
33
LCD segment driver output 4
SEG5
20
34
LCD segment driver output 5
SEG6
21
-
LCD segment driver output 6
SEG7
22
35
LCD segment driver output 7
SEG8
23
36
LCD segment driver output 8
SEG9
24
37
LCD segment driver output 9
SEG10
25
38
LCD segment driver output 10
SEG11
26
39
LCD segment driver output 11
SEG12
27
40
LCD segment driver output 12
SEG13
28
1
LCD segment driver output 13
SEG14
29
2
LCD segment driver output 14
SEG15
30
-
LCD segment driver output 15
SEG16
31
3
LCD segment driver output 16
SEG17
32
4
LCD segment driver output 17
SEG18
33
5
LCD segment driver output 18
SEG19
34
6
LCD segment driver output 19
SEG20
35
7
LCD segment driver output 20
SEG21
36
8
LCD segment driver output 21
SEG22
37
9
LCD segment driver output 22
SEG23
38
10
LCD segment driver output 23
SEG24
39
11
LCD segment driver output 24
SEG25
40
-
LCD segment driver output 25
SEG26
41
12
LCD segment driver output 26
1998 Jun 18
5
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
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.
SEG27
42
13
LCD segment driver output 27
SEG28
43
14
LCD segment driver output 28
SEG29
44
15
LCD segment driver output 29
SEG30
1
16
LCD segment driver output 30
SEG31
2
17
LCD segment driver output 31
SEG32
3
18
LCD segment driver output 32
SYMBOL
PIN
DESCRIPTION
QFP44
DIP40
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