pcf8576d NXP Semiconductors, pcf8576d Datasheet - Page 15

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

Philips Semiconductors
6.4.4
When four backplanes are provided in the LCD, the 1 : 4 multiplex drive mode applies (see Fig.10).
2004 Dec 22
handbook, full pagewidth
Universal LCD driver for low
multiplex rates
1 : 4
S n
S n
S n
state 1
state 2
BP2
BP0
BP1
BP3
S n
MULTIPLEX DRIVE MODE
1
2
3
V LCD
V LCD /3
V SS
V LCD
V LCD /3
V SS
V LCD
V LCD /3
V SS
V LCD
V LCD /3
V SS
V LCD
V LCD /3
V SS
V LCD
V LCD /3
V LCD
V LCD /3
2V LCD /3
V LCD
V LCD /3
V SS
2V LCD /3
V LCD
V LCD /3
V SS
2V LCD /3
2V LCD /3
2V LCD /3
2V LCD /3
2V LCD /3
V LCD
2V LCD /3
V LCD /3
V SS
2V LCD /3
2V LCD /3
V LCD /3
2V LCD /3
V LCD
V LCD /3
2V LCD /3
V LCD
0 V
0 V
Fig.10 Waveforms for the 1 : 4 multiplex drive mode.
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
T frame
15
state 1
state 2
MGL749
LCD segments
V
V
V
V
state1
on(rms)
state2
off(rms)
t ( )
t ( )
Product specification
=
=
=
=
PCF8576D
0.577V
0.333V
V
V
S
S
n
n
t ( ) V
t ( ) V
–
–
LCD
LCD
BP0
BP1
t ( )
t ( )