pcf8576d NXP Semiconductors, pcf8576d Datasheet - Page 12

• Manufacturer Part Number: pcf8576d
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.4.2
The 1 : 2 multiplex drive mode is used when two backplanes are provided in the LCD. This mode allows fractional LCD
bias voltages of
2004 Dec 22
handbook, full pagewidth
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
1
–
–
LCD
LCD
2
bias or
BP0
BP1
t ( )
t ( )
S n
1
state 1
state 2
Fig.7 Waveforms for the 1 : 2 multiplex drive mode with
3
BP0
BP1
S n
bias as shown in Figs 7 and 8.
1
V SS
V SS
V SS
V SS
V LCD
V LCD /2
V LCD
V LCD /2
V LCD
V LCD
V LCD
V LCD /2
V LCD
V LCD /2
V LCD /2
V LCD
V LCD /2
V LCD
0 V
0 V
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
12
T frame
state 1
state 2
MGL746
LCD segments
1
2
bias.
Product specification
PCF8576D