OM4068 Philips Semiconductors, OM4068 Datasheet - Page 8

• Manufacturer Part Number: OM4068
• Description: LCD driver for low multiplex rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The OM4068 is a low-power LCD driver designed to
interface with any microprocessor/microcontroller and a
wide variety of LCDs. It can drive any static or multiplexed
LCD containing up to three backplanes and
up to 96 segments.
Table 1 Selection of display configurations
The host microprocessor/microcontroller maintains the
3-line bus communication channel with OM4068.
The internal oscillator requires no external components.
The appropriate intermediate biasing voltage for the
multiplexed LCD waveforms are generated on-chip.
1998 Jun 18
handbook, full pagewidth
LCD driver for low multiplex rates
(1) 28 segment drivers for DIP40 package.
BACKPLANES
3
2
1
V DD
V SS
NUMBER OF
MICROCONTROLLER
MICROPROCESSOR/
HOST
SEGMENTS
DISPLAY
96
64
32
Fig.4 Typical system configuration.
SCLK
SDIN
SCE
DIGITS
M1 M0
V DD
12
7-SEGMENTS NUMERIC
8
4
8
OM4068
The display configurations possible with the OM4068
depend on the number of active backplane outputs
required; a selection of display configurations is given in
Table 1.
A typical system (MUX 1 : 3) is shown in Fig.4.
The only other connections required to complete the
system are to the power supplies (V
suitable capacitors to decouple the V
V
SS
.
V LCD
V SS
32 segment drivers
3 backplanes
INDICATOR
SYMBOLS
12
8
4
SDOUT
(1)
LCD PANEL
(up to 96
elements)
96 dots (3
64 dots (2
32 dots (1
SS
MBK818
Product specification
LCD
, V
DOT MATRIX
DD
and V
OM4068
and V
DD
32)
32)
32)
LCD
pins to
) and