pca8533 NXP Semiconductors, pca8533 Datasheet - Page 10

• Manufacturer Part Number: pca8533
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA8533
Product data sheet
7.4.2 1:2 multiplex drive mode
The 1:2 multiplex drive mode is used when two backplanes are provided in the LCD. This
mode allows fractional LCD bias voltages of
Figure
Fig 7.
8.
V
V
V
V
Waveforms for the 1:2 multiplex drive mode with
state1
on(RMS)
state2
off(RMS)
Sn+1
state 1
state 2
(t) = V
(t) = V
BP0
BP1
S n
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= 0.791V
= 0.354V
Sn
Sn
(t) − V
(t) − V
V
V
V
V
V
V
V
V
V
V
V
V
−V
−V
V
V
−V
−V
0 V
0 V
LCD
LCD
SS
LCD
LCD
SS
LCD
SS
LCD
SS
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Rev. 1 — 27 April 2011
LCD
BP0
BP1
/ 2
/ 2
/ 2
/ 2
.
.
/ 2
/ 2
(t).
(t).
(a) Waveforms at driver.
(b) Resultant waveforms
Universal LCD driver for low multiplex rates
at LCD segment.
1
⁄
2
bias or
T
fr
1
⁄
3
1
bias as shown in
⁄
2
bias
state 1
state 2
mgl746
LCD segments
PCA8533
© NXP B.V. 2011. All rights reserved.
Figure 7
10 of 48
and