pca8576d NXP Semiconductors, pca8576d Datasheet - Page 10

• Manufacturer Part Number: pca8576d
• Description: Automotive 40 X 4 Lcd Segment Driver For Low Multiplex Rates Up To 1 4
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA8576D
Product data sheet
7.4.2 1:2 Multiplex drive mode
The 1:2 multiplex drive mode is used when two backplanes are provided in the LCD. This
mode allows fractional LCD bias voltages of
Figure
Fig 6.
(1) V
(2) V
(3) V
(4) V
7.
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
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= 0.354V
= 0.791V
Sn
Sn+1
(t)  V
V
V
V
V
V
V
V
V
V
V
V
V
−V
−V
V
V
−V
−V
0 V
0 V
(t)  V
LCD
LCD
SS
LCD
LCD
SS
LCD
SS
LCD
SS
LCD
LCD
LCD
LCD
Automotive 40 x 4 LCD segment driver for low multiplex rates
LCD
LCD
LCD
LCD
LCD
LCD
Rev. 1 — 4 April 2011
BP0
/ 2
/ 2
/ 2
/ 2
.
.
/ 2
/ 2
BP1
(t).
(t).
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
1

2
bias or
T
fr
1

3
1
bias as shown in

2
bias
state 1
state 2
mgl746
LCD segments
PCA8576D
© NXP B.V. 2011. All rights reserved.
Figure 6
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and