PCF8578 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
PCF8578 Datasheet PDF : 48 Pages
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Philips Semiconductors
LCD row/column driver for
dot matrix graphic displays
Product specification
PCF8578
2003 Apr 14
ROW 1
R1 (t)
VDD
V2
V3
V4
V5
V LCD
ROW 2
R2 (t)
VDD
V2
V3
V4
V5
V LCD
COL 1
C1 (t)
VDD
V2
V3
V4
V5
V LCD
COL 2
C2 (t)
VDD
V2
V3
V4
V5
V LCD
V op
V state 1 (t)
0.261 Vop
0V
0.261 Vop
T frame
V op
V state 2 (t)
V op
0.478 Vop
0.261 Vop
0V
0.261 Vop
0.478 Vop
V op
Vstate 1 (t) = C1(t) R1(t):
Von(rms) =
Vop
1
8
8 ( 8 8 1 1) = 0.430
Vstate 2 (t) = C2(t) R2(t):
Voff(rms) =
Vop
2(
8
(
8
8
1)
1) 2
=
0.297
state 1 (OFF)
state 2 (ON)
dot matrix
1:8 multiplex rate
MSA840
general relationship (n = multiplex rate)
Von(rms) =
Vop
1
n1
n n ( n 1)
Voff(rms)
Vop
=
2( n 1)
n ( n 1)2
Fig.7 LCD drive mode waveforms for 1 : 8 multiplex rate.
12
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