PCF85321 NXP [NXP Semiconductors], PCF85321 Datasheet - Page 9

• Manufacturer Part Number: PCF85321
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8532_1
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
PCF8532 allows the use of
Figure
Fig 5.
6.
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
(t)
(t)
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Rev. 1 — 10 February 2009
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
BP0
BP1
/ 2
/ 2
/ 2
/ 2
.
.
/ 2
/ 2
1
(t).
(t).
2
bias or
1
3
(a) Waveforms at driver.
(b) Resultant waveforms
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
PCF8532
Figure 5
© NXP B.V. 2009. All rights reserved.
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