PCF8579 Philips Semiconductors, PCF8579 Datasheet - Page 10

• Manufacturer Part Number: PCF8579
• Description: LCD column driver for dot matrix graphic displays
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1997 Apr 01
LCD column driver for dot matrix graphic
displays
V state 1 (t)
V state 2 (t)
ROW 1
R1 (t)
ROW 2
R2 (t)
COL 1
C1 (t)
COL 2
C2 (t)
Fig.6 LCD drive mode waveforms for 1 : 8 multiplex rate.
0.261 V op
0 V
0.261 V op
0.478 V op
0.261 V op
0 V
0.261 V op
0.478 V op
V op
V op
V op
V op
V
V
V
V
on(rms)
off(rms)
state 1
state 2
V
V
V DD
V 2
V
V
V
V
V DD
V 2
V
V
V
V
V DD
V 2
V
V
V
V
V DD
V 2
V
V
V
V
op
op
3
4
5
LCD
3
4
5
LCD
3
4
5
LCD
3
4
5
LCD
(t) = C1(t)
(t) = C2(t)
=
=
1
8
2 (
8
(
8
R1(t):
R2(t):
8
(
8 1
8
1
8
)
1
)
2
1
= 0.297
)
T frame
= 0.430
10
V
V
MSA840
general relationship (n = multiplex rate)
on(rms)
off(rms)
V
V
op
op
=
=
dot matrix
1:8 multiplex rate
1
n
2 (
state 1 (OFF)
state 2 (ON)
n
(
n
n 1
(
n 1
n
n 1
)
1
)
2
)
Product specification
PCF8579