pcf8534ah-1 NXP Semiconductors, pcf8534ah-1 Datasheet - Page 9

• Manufacturer Part Number: pcf8534ah-1
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.4.2
When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8533 allows the use of
or
1999 Jul 30
handbook, full pagewidth
Universal LCD driver for low multiplex rates
1
V
V
V
V
3
state1
on(rms)
state2
off(rms)
bias in this mode as shown in Figs 4 and 5.
(t) = V
(t) = V
1 : 2
= 0.791V
= 0.354V
sn
sn
MULTIPLEX DRIVE MODE
(t)
(t)
LCD
LCD
V
V
BP0
BP1
.
.
(t).
(t).
S n
state 1
state 2
Fig.4 Waveforms for the 1 : 2 multiplex drive mode with
BP0
BP1
S n
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.
9
T frame
state 1
state 2
MGL746
LCD segments
1
2
bias.
Product specification
PCF8533
1
2
bias