pcf8562 NXP Semiconductors, pcf8562 Datasheet - Page 9

• Manufacturer Part Number: pcf8562
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8562_2
Product data sheet
6.4.2 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 5. Waveforms for the 1 : 2 multiplex drive mode with
a. Waveforms at driver
b. Resultant waveforms at LCD segment
6.
V
V
state1
off(rms)
(t) = V
= 0.354V
Sn 1
BP0
BP1
Sn
Sn
(t)
Rev. 02 — 22 January 2007
state 1
state 2
LCD
V
V
LCD
LCD
V
V
V
V
V
BP0
V
V
V
V
LCD
LCD
LCD
LCD
/ 2
SS
/ 2
SS
SS
SS
(t); V
V
V
V
V
LCD
LCD
LCD
LCD
V
V
V
V
on(rms)
LCD
LCD
LCD
LCD
0 V
0 V
/ 2
/ 2
/ 2
/ 2
= 0.791V
Universal LCD driver for low multiplex rates
T
LCD
1
frame
2
; V
bias or
state2
(t) = V
1
3
1
bias as shown in
Sn
2
(t)
state 1
state 2
bias
001aac315
LCD segments
V
BP1
001aac314
(t);
PCF8562
© NXP B.V. 2007. All rights reserved.
Figure 5
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