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PCF8576CU/2 Datasheet(PDF) 11 Page - NXP Semiconductors

Part # PCF8576CU/2
Description  Universal LCD driver for low multiplex rates
PDF  44 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8576CU/2 Datasheet(HTML) 11 Page - NXP Semiconductors

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1998 Jul 30
11
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex
rates
PCF8576C
6.4.2
1 : 2 MULTIPLEX DRIVE MODE
When two backplanes are provided in the LCD, the 1 : 2 multiplex mode applies. The PCF8576C allows use of 1
⁄2bias or
1
⁄3bias in this mode as shown in Figs 6 and 7.
Fig.6 Waveforms for the 1 : 2 multiplex drive mode with 1
⁄2bias (Vop =VDD − VLCD).
V
state1 t
()
V
S
n
t
()
V
BP0 t
()
–
=
V
on(rms)
0.791V
op
=
V
state2 t
()
V
S
n
t
()
V
BP1 t
()
–
=
V
off(rms)
0.354V
op
=
MBE540
V
(V
)/2
V
DD
V
/2
op
Vop
state 1
0
BP0
S n 1
(a) waveforms at driver
(b) resultant waveforms
at LCD segment
LCD segments
state 2
Tframe
DD
LCD
VLCD
BP1
Sn
Vop
V
/2
op
V
/2
op
Vop
state 2
0
Vop
V
/2
op
state 1
V
(V
)/2
V
DD
DD
LCD
VLCD
VLCD
VLCD
VDD
VDD



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