PCF8579U7 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCF8579U7 Datasheet PDF : 40 Pages
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Philips Semiconductors
LCD column driver for dot matrix graphic
displays
Product specification
PCF8579
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)
0.2 Vop
0V
0.2 Vop
V op
V state 2 (t)
V op
0.6 Vop
0.2 Vop
0V
0.2 Vop
0.6 Vop
V op
T frame
state 1 (OFF)
state 2 (ON)
dot matrix
1:16 multiplex rate
MSA836
Vstate 1 (t) = C1(t) R1(t):
Von(rms) =
Vop
1
16
16
16 1
( 16 1)
=
0.316
Vstate 2 (t) = C2(t) R2(t):
Voff(rms) =
Vop
2(
16
16 1)
( 16 1) 2
=
0.254
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 : 16 multiplex rate.sa.
1997 Apr 01
11
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