pcf8534 NXP Semiconductors, pcf8534 Datasheet - Page 13

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

NXP Semiconductors
PCF8534_0
Preliminary datasheet
6.4.4 1:4 Multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies, as
shown in
Fig 8. Waveforms for the 1:4 multiplex drive mode.
S
S
S
state 1
state 2
BP2
BP0
BP1
BP3
n+1
n+2
n+3
S
n
V
V
V
V
Figure
state1
ON(rms)
state2
OFF(rms)
(t) = V
(t) = V
−V
−V
−V
V
V
V
V
V
V
V
−2V
−2V
V
V
2V
V
V
V
V
2V
V
V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
V
2V
V
−V
V
2V
V
2V
2V
SS
SS
SS
SS
SS
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
0 V
LCD
LCD
0 V
LCD
LCD
LCD
LCD
LCD
LCD
= 0.577 V
LCD
LCD
LCD
LCD
= 0.333 V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
8.
LCD
LCD
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
sn
(sn)
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
(t) − V
Rev. 00.05 — 20 February 2007
(t) − V
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
mgl749
PCF8534
© NXP B.V. 2007. All rights reserved.
LCD segments
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