SIC63616-(Rev. 1.0) NO. P63
3240-0412
Fig. 4.6.1.2 Configuration of LCD driver and drive power supply (V
C2
reference, 1/4 bias)
V
C1
V
D2
V
C3
V
C4
V
C5
CA
CB
CC
CD
CE
CF
CG
COM0–COM15
SEG0–SEG55
V
SS
LCD system
voltage regulator
V
C2
LCD contrast
adjustment circuit
LC3
LC2
LC1
LC0
LCD driver
V
C1–
V
C5
Display memory
Power supply
voltage
booster/halver
Clock
manager
V
DD
V
D2
LPAGE
VCSEL
LDUTY2
LDUTY1
LDUTY0
DSPC1
DSPC0
VCCKS1
VCCKS0
FLCKS1
FLCKS0
DBON
OSC1
Oscillation circuit
Fig. 4.6.1.3 Configuration of LCD driver and drive power supply (V
C1
reference, 1/4 bias)
4.6.2 Power supply for LCD driving
(1) Mask option
The S1C63616 provides three options to configure the internal LCD power supply for generating the
LCD drive voltages V
C1
–V
C5
.
TYPE 1
V
C2
reference, 1/5 bias
V
DD
= 1.6 to 2.5 V (power supply voltage booster/halver is used)
V
DD
= 2.5 to 5.5 V (power supply voltage booster/halver is not used)
TYPE 2
V
C2
reference, 1/4 bias
V
DD
= 1.6 to 2.5 V (power supply voltage booster/halver is used)
V
DD
= 2.5 to 5.5 V (power supply voltage booster/halver is not used)
TYPE 3
V
C1
reference, 1/4 bias
V
DD
= 1.6 to 5.5 V (power supply voltage booster/halver is not used)
Select one from three types according to the supply voltage and the LCD panel characteristics.
The LCD drive voltages are generated by boosting/halving the V
C1
or V
C2
reference voltage output
from the voltage regulator.
Table 4.6.2.1 lists the V
C1
, V
C2
, V
C3
, V
C4
and V
C5
voltage values and boosting/halving status. Note that
the number of externally attached parts differs according to the selected bias (1/5 or 1/4). (See Figures
4.6.1.1 to 4.6.1.3.)
Table 4.6.2.1 LCD drive voltage
LCD drive voltage
V
C1
V
C2
V
C3
V
C4
V
C5
TYPE 1
V
C2
×
0.5
V
C2
(reference)
V
C2
×
1.5
V
C2
×
2
V
C2
×
2.5
[V]
1.10
2.20
3.30
4.40
5.50
TYPE 2
V
C2
×
0.5
V
C2
(reference)
= V
C2
V
C2
×
1.5
V
C2
×
2
[V]
1.13
2.25
2.25
3.38
4.50
TYPE 3
V
C1
(reference)
V
C1
×
2
= V
C2
V
C1
×
3
V
C1
×
4
[V]
1.13
2.25
2.25
3.38
4.50
Note: Each LCD drive voltage varies depending on the contrast adjustment register (LCx) setting.