SIC63616-(Rev. 1.0) NO. P9
3240-0412
chapter
2 p
Ower
S
upply
and
i
nitial
r
eSet
2.1 Power Supply
This section explains the operating voltage and the configuration of the internal power supply circuit of the
S1C63616.
2.1.1 Operating voltage
The S1C63616 operating power voltage is as follows:
1.6 V to 5.5 V
2.1.2 Internal power supply circuit
The S1C63616 incorporates the power supply circuit shown in Figure 2.1.2.1. When voltage within the range
described above is supplied to V
DD
(+) and V
SS
(GND), all the voltages needed for the internal circuits are
generated internally in the IC.
V
C1
–V
C5
OSC3
OSC4
OSC1
OSC2
COM0–COM31
SEG0–SEG39
∗
1 Leave these terminals open when the power supply voltage booster/halver is not used.
∗
2 Connect when the 1/5 bias LCD drive power is used. (Leave the terminal open when the 1/4 bias LCD drive power is used.)
∗
3 Can be selected as the power source for the LCD system voltage regulator when the power supply voltage booster/halver
operates in boost mode.
∗
4 HLON is prohibited from use.
∗
1
∗
2
Power supply voltage
booster/halver
Oscillation system
voltage regulator
Internal voltage
regulator
OSC3
oscillation circuit
Internal circuits
OSC1
oscillation circuit
DBON
VCSEL
HLON
External
power
supply
V
DD
CF
CG
V
D2
V
D1
V
OSC
V
C1
V
C2
V
C3
V
C4
V
C5
CA
CB
CC
CD
CE
V
SS
V
DD
V
D1
V
D2
V
OSC
LCD
driver
circuit
LCD system
voltage
regulator
∗
3
∗
4
V
DD
Fig. 2.1.2.1 Configuration of power supply circuit
The power supply circuit is broadly divided into four blocks.
Table 2.1.2.1 Power supply circuit
Circuit
Internal and oscillation system voltage regulators
Internal circuits and OSC3 oscillation circuit
OSC1 oscillation circuit
LCD system voltage regulator
LCD driver
Power supply circuit
Power supply voltage (V
DD
)
Internal voltage regulator
Oscillation system voltage regulator
Power supply voltage booster/halver (halving mode)
LCD system voltage regulator
Output voltage
—
V
D1
V
OSC
V
DD
or
V
D2
V
C1
—V
C5
Note: The supply voltage booster/halver circuit can perform either boosting or halving the supply voltage at
a time. The boosting and halving operations cannot be performed simultaneously.