PCA9620H NXP [NXP Semiconductors], PCA9620H Datasheet - Page 26

• Manufacturer Part Number: PCA9620H
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9620
Product data sheet
7.4.2.3 1:4 Multiplex drive mode
When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies, as
shown in
Fig 18. Waveforms for the 1:4 multiplex drive mode with
Sn+1
Sn+2
Sn+3
state 1
state 2
BP2
BP0
BP1
BP3
Sn
Figure
V
V
V
state1
state2
on(RMS)
(t) = V
(t) = V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
V
V
2V
V
−V
−2V
−V
V
2V
V
−V
−2V
−V
0 V
0 V
All information provided in this document is subject to legal disclaimers.
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
SS
LCD
LCD
LCD
LCD
(t) = 0.577V
18.
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
Sn
Sn
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
/3
(t) − V
(t) − V
Rev. 1 — 9 December 2010
LCD
BP0
BP1
. V
(t).
(t).
off(RMS)
(t) = 0.333V
(b) Resultant waveforms
(a) Waveforms at driver.
at LCD segment.
Universal LCD driver for low multiplex rates
T
fr
LCD
.
1
⁄
3
bias (line inversion mode)
state 1
state 2
013aaa211
PCA9620
© NXP B.V. 2010. All rights reserved.
LCD segments
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