pcf8534 NXP Semiconductors, pcf8534 Datasheet - Page 12

• Manufacturer Part Number: pcf8534
• Description: Universal Driver Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8534_0
Preliminary datasheet
6.4.3 1:3 Multiplex drive mode
When three backplanes are provided in the LCD, the 1:3 multiplex drive mode applies, as
shown in
Fig 7. Waveforms for the 1:3 multiplex drive mode.
V
V
V
V
state 1
state 2
S
S
BP2
BP0
BP1
Figure
state1
ON(rms)
state2
OFF(rms)
n+1
n+2
S
n
(t) = V
(t) = V
−V
−V
−V
= 0.638 V
V
V
V
V
V
V
−2V
−2V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
−V
= 0.333 V
7.
SS
SS
SS
SS
SS
SS
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
0 V
LCD
LCD
0 V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
sn
(sn)
/3
/3
/3
/3
/3
/3
/3
/3
(t) − V
/3
/3
Rev. 00.05 — 20 February 2007
/3
/3
/3
/3
/3
/3
/3
/3
(t) − V
/3
/3
LCD
LCD
BP0
BP1
.
.
(t).
(t).
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
Universal LCD driver for low multiplex rates
T
frame
state 1
state 2
LCD segments
mgl748
PCF8534
© NXP B.V. 2007. All rights reserved.
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