UPD78F0411GA-GAM-AX Datasheet, PDF (410/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 15 LCD CONTROLLER/DRIVER
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 VDD = 5 V, VLC0 = 5 V)
(b) Static display mode
(MDSET1, MDSET0 = 0, 0)
(example of VDD = 5 V, VLC0 = 3 V)
SCOC
VDD
P-ch
VLC0
VLC1
VLC2
P40/KR0
VSS
VLC0
VLC1 ^Note
VLC2 ^Note
P40/KR0
VSS
VLC0 = VDD
Note Connect VLC1 and VLC2 directly to GND or VLC0.
(c) 1/2 bias method
(MDSET1, MDSET0 = 0, 0)
(example of VDD = 5 V, VLC0 = 5 V)
SCOC
VLC0
VLC1
VLC2
P40/KR0
VSS
P-ch
VDD
2R
VLC0
3R
VLC1
VLC2
P40/
KR0
VSS
VLC0 =
3
5
VDD
(d) 1/2 bias method
(MDSET1, MDSET0 = 0, 0)
(example of VDD = 5 V, VLC0 = 3 V)
SCOC
VDD
P-ch
VLC0
VLC1
VLC2
P40/KR0
VSS
VLC0
R
VLC1
VLC2
R
P40/
KR0
VSS
VLC0 = VDD
SCOC
VLC0
VLC1
VLC2
P40/KR0
VSS
P-ch
VDD
VLC0
4
3
R
R
VLC1
VLC2
R
P40/
KR0
VSS
VLC0 =
3
5
VDD
408
User’s Manual U18698EJ1V0UD