pcf8534a NXP Semiconductors, pcf8534a Datasheet - Page 9

• Manufacturer Part Number: pcf8534a
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8534A_3
Product data sheet
7.4.2 1:2 Multiplex drive mode
When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The
PCF8534A allows the use of
Figure
Fig 6.
7.
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
= 0.791V
= 0.354V
Sn
Sn
Rev. 03 — 10 November 2008
(t)
(t)
V
V
V
V
V
V
V
V
V
V
V
V
V
V
0 V
0 V
V
V
V
V
LCD
LCD
SS
LCD
LCD
SS
LCD
SS
LCD
SS
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
V
V
/ 2
/ 2
/ 2
/ 2
BP0
BP1
.
.
/ 2
/ 2
(t).
(t).
1
2
bias or
1
(a) Waveforms at driver.
(b) Resultant waveforms
3
bias in this mode as shown in
Universal LCD driver for low multiplex rates
at LCD segment.
T
fr
1
2
bias
state 1
state 2
mgl746
LCD segments
PCF8534A
© NXP B.V. 2008. All rights reserved.
Figure 6
and
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