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PCF8578U/2 Datasheet(PDF) 12 Page - NXP Semiconductors

Part # PCF8578U/2
Description  LCD row/column driver for dot matrix graphic displays
PDF  44 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8578U/2 Datasheet(HTML) 12 Page - NXP Semiconductors

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1998 Sep 08
12
Philips Semiconductors
Product specification
LCD row/column driver for dot matrix
graphic displays
PCF8578
Fig.7 LCD drive mode waveforms for 1 : 8 multiplex rate.
MSA840
VDD
V2
V
V
V
V
3
4
5
LCD
T frame
ROW 1
R1 (t)
VDD
V2
V
V
V
V
3
4
5
LCD
ROW 2
R2 (t)
VDD
V2
V
V
V
V
3
4
5
LCD
COL 1
C1 (t)
VDD
V2
V
V
V
V
3
4
5
LCD
COL 2
C2 (t)
dot matrix
1:8 multiplex rate
0.261 Vop
0.261 Vop
0 V
Vop
Vop
V state 1 (t)
V state 2 (t)
0.261 Vop
0.261 Vop
0 V
Vop
Vop
0.478 Vop
0.478 Vop
state 1 (OFF)
state 2 (ON)
Vstate 1 (t) = C1(t) R1(t):
Von(rms)
Vop
=
1
8
8
1
8
1
()
8
= 0.430
Vstate 2 (t) = C2(t) R2(t):
Voff(rms)
Vop
=
8
1
8
1
()
8
= 0.297
2
2 ()
general relationship (n = multiplex rate)
Von(rms)
Vop
=
1
n
n
1
n
1
()
n
Voff(rms)
Vop
=
n 1
n 1
()
n
2
2 ()



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