PCF8576C Philips Semiconductors, PCF8576C Datasheet - Page 13

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

Philips Semiconductors
6.4.3
When three backplanes are provided in the LCD, the 1 : 3 multiplex drive mode applies, as shown in Fig.8.
1998 Jul 30
Universal LCD driver for low multiplex
rates
V
V
V
V
state1
on(rms)
state2
off(rms)
t ( )
t ( )
1 : 3
=
=
=
=
0.638V
0.333V
V
V
S
S
MULTIPLEX DRIVE MODE
n
n
t ( ) V
t ( ) V
–
–
op
op
BP0
BP1
BP2/S23
S n 1
S n 2
state 1
state 2
t ( )
t ( )
BP0
BP1
S n
Fig.8 Waveforms for the 1 : 3 multiplex drive mode (V
V DD
V
V
V LCD
V DD
V
V
V LCD
V DD
V
V
V LCD
V DD
V
V
V LCD
V DD
V
V
V LCD
V DD
V
V
V LCD
V op
V
V
V op
V op
V
V
V op
2V
2V
2V
2V
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
op
op
op
op
op
op
op
op
/3
/3
/3
/3
0
0
/3
/3
/3
/3
V
V
V
V
V
V
2V
2V
2V
2V
2V
2V
op
op
op
op
op
op
op
op
op
op
op
op
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
T frame
13
op
= V
state 1
state 2
LCD segments
DD
MBE542
V
LCD
).
Product specification
PCF8576C