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PDF OM4085 Data sheet ( Hoja de datos )
| Número de pieza | OM4085 | |
| Descripción | Universal LCD driver for low multiplex rates | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
OM4085
Universal LCD driver for low
multiplex rates
Product specification
Supersedes data of 1996 Nov 14
File under Integrated Circuits, IC12
1997 Feb 25
1 page  
Philips Semiconductors
Universal LCD driver for low multiplex
rates
Product specification
OM4085
FUNCTIONAL DESCRIPTION
The OM4085 is a versatile peripheral device designed to
interface any microprocessor to a wide variety of LCDs.
It can directly drive any static or multiplexed LCD
containing up to 4 backplanes and up to 24 segments.
The display configurations possible with the OM4085
depend on the number of active backplane outputs
required; a selection of display configurations is given in
Table 1.
All of the display configurations given in Table 1 can be
implemented in the typical system shown in Fig.3.
The host microprocessor/microcontroller maintains the
two-line I2C-bus communication channel with the
OM4085. The internal oscillator is selected by tying OSC
(pin 6) to VSS. The appropriate biasing voltages for the
multiplexed LCD waveforms are generated internally.
The only other connections required to complete the
system are to the power supplies (VDD, VSS and VLCD) and
to the LCD panel chosen for the application.
Table 1 Selection of display configurations
ACTIVE
BACKPLANE
OUTPUTS
4
3
2
1
NUMBER OF
SEGMENTS
7-SEGMENT NUMERIC
14-SEGMENT
ALPHANUMERIC
96 12 digits + 12 indicator 6 characters + 12 indicator
symbols
symbols
72
9 digits + 9 indicator
4 characters + 16 indicator
symbols
symbols
48
6 digits + 6 indicator
3 characters + 6 indicator
symbols
symbols
24
3 digits + 3 indicator
1 character + 10 indicator
symbols
symbols
DOT MATRIX
96 dots (4 × 24)
72 dots (3 × 24)
48 dots (2 × 24)
24 dots
handbook, full pagewidth VDD
R
≤
trise
2 Cbus
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
VSS
SDA 1
VDD
5
VLCD
12
17 to 40 24 segment drives
SCL 2
OSC
6
7
OM4085
13 to 16 4 backplanes
8 9 10 11
A0 A1 A2 SA0 VSS
LCD PANEL
(up to 96
elements)
MBH951
1997 Feb 25
Fig.3 Typical system configuration.
5
5 Page 
Philips Semiconductors
Universal LCD driver for low multiplex
rates
Product specification
OM4085
handbook, full pagewidth
BP0
BP1
BP2
BP3
Sn
Sn + 1
Sn + 2
Sn + 3
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
VDD
VDD − Vop/3
VDD − 2Vop/3
VLCD
state 1
state 2
Vop
2Vop/3
Vop/3
0
−Vop/3
−2Vop/3
−Vop
Vop
2Vop/3
Vop/3
0
−Vop/3
−2Vop/3
−Vop
Tframe
LCD segments
state 1
state 2
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
At any instant (t):
Vstate 1(t) = VSn(t) − VBP0(t)
Von(rms)
=
Vop√3
3
=
0.577Vop
Vstate 2(t) = VSn(t) − VBP1(t)
Voff(rms)
=
Vop
3
=
0.333Vop
MGG396
1997 Feb 25
Fig.8 Waveforms for 1 : 4 multiplex drive mode: Vop = VDD − VLCD.
11
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| PDF Descargar | [ Datasheet OM4085.PDF ] | |
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