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2 p
chapter
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
generated internally in the IC.
V
External
power
supply
CG
V
∗1
V
V
OSC
V
V
V
∗2
V
V
CA
CB
CC
CD
CE
V
∗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.
The power supply circuit is broadly divided into four blocks.
Circuit
Internal and oscillation system voltage regulators
Internal circuits and OSC3 oscillation circuit
OSC1 oscillation circuit
LCD system voltage regulator
LCD driver
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.
S
Ower
(+) and V
DD
SS
DD
CF
Power supply voltage
booster/halver
D2
V
D2
D1
V
∗3
DD
VCSEL
Oscillation system
voltage regulator
V
OSC
C1
C2
C3
C4
LCD system
C5
V
–V
C1
voltage
regulator
SS
Fig. 2.1.2.1 Configuration of power supply circuit
Table 2.1.2.1 Power supply circuit
Power supply voltage (V
Internal voltage regulator
Oscillation system voltage regulator
Power supply voltage booster/halver (halving mode)
LCD system voltage regulator
upply and
(GND), all the voltages needed for the internal circuits are
DBON
∗4
HLON
Internal circuits
V
DD
Internal voltage
V
D1
regulator
oscillation circuit
oscillation circuit
C5
Power supply circuit
)
DD
SIC63616-(Rev. 1.0) NO. P9
i
r
nitial
OSC3
OSC3
OSC4
OSC1
OSC1
OSC2
LCD
COM0–COM31
driver
SEG0–SEG39
circuit
Output voltage
—
V
V
OSC
V
or
DD
V
—V
C1
eSet
D1
V
D2
C5
3240-0412
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