Datasheet
CHAPTER 15 LCD CONTROLLER/DRIVER
408 User’s Manual U18698EJ1V0UD
15.8.2 External resistance division method
The 78K0/LC3 can also use external voltage divider resistors for generating LCD drive power supplies, without
using internal resistors. Figure 15-24 shows examples of LCD drive voltage connection, corresponding to each bias
method.
Figure 15-24. Examples of LCD Drive Power Connections (External Resistance Division Method) (1/2)
(a) Static display mode
(MDSET1, MDSET0 = 0, 0)
(example of V
DD = 5 V, VLC0 = 5 V)
(b) Static display mode
(MDSET1, MDSET0 = 0, 0)
(example of V
DD = 5 V, VLC0 = 3 V)
V
LC0
V
LC0
V
LC1
V
LC2
V
SS
V
DD
P-ch
SCOC
V
SS
V
LC1
Note
V
LC2
Note
P40/KR0
P40/KR0
V
LC0
= V
DD
V
LC0
V
LC0
V
LC1
V
LC2
V
SS
V
DD
P-ch
SCOC
V
SS
V
LC1
V
LC2
P40/KR0
P40/
KR0
2R
3R
V
LC0
= V
DD
5
3
Note Connect VLC1 and VLC2 directly to GND or VLC0.
(c) 1/2 bias method
(MDSET1, MDSET0 = 0, 0)
(example of V
DD = 5 V, VLC0 = 5 V)
(d) 1/2 bias method
(MDSET1, MDSET0 = 0, 0)
(example of V
DD = 5 V, VLC0 = 3 V)
V
LC0
V
LC0
V
LC1
V
LC2
V
SS
V
DD
P-ch
SCOC
V
SS
V
LC1
V
LC2
P40/KR0
P40/
KR0
R
R
V
LC0
= V
DD
V
LC0
V
LC0
V
LC1
V
LC2
V
SS
V
DD
P-ch
SCOC
V
SS
V
LC1
V
LC2
P40/KR0
P40/
KR0
R
R
3
4
R
V
LC0
= V
DD
5
3