PCF8576C Philips Semiconductors, PCF8576C Datasheet - Page 11

• Manufacturer Part Number: PCF8576C
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
6.4.2
When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8576C allows use of
1
1998 Jul 30
3
bias in this mode as shown in Figs 6 and 7.
Universal LCD driver for low multiplex
rates
V
V
V
V
state1
on(rms)
state2
off(rms)
t ( )
t ( )
1 : 2
=
=
=
=
0.791V
0.354V
V
V
S
S
MULTIPLEX DRIVE MODE
n
n
t ( ) V
t ( ) V
–
–
op
op
Fig.6 Waveforms for the 1 : 2 multiplex drive mode with
BP0
BP1
t ( )
t ( )
S n 1
state 1
state 2
S n
BP0
BP1
(V
(V
V
V LCD
V
V LCD
V DD
V LCD
V DD
V LCD
V op
V op
V op
V op
V
V
V
V
DD
DD
DD
DD
op
op
op
op
0
0
/2
/2
/2
/2
V
V
LCD
LCD
)/2
)/2
(b) resultant waveforms
(a) waveforms at driver
at LCD segment
11
T frame
1
2
bias (V
state 1
state 2
MBE540
LCD segments
op
= V
DD
V
LCD
Product specification
PCF8576C
).
1
2
bias or