SIC63616-(Rev. 1.0) NO. P32
3240-0412
4.2 Power Control
4.2.1 Configuration of power supply circuit
The S1C63616 has built-in power supply circuits shown in Figure 4.2.1.1 so the voltages to drive the CPU,
internal logic circuits, oscillation circuits and LCD driver can be generated on the chip.
LPWR
VCHLMOD
VDHLMOD
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. 4.2.1.1 Built-in power supply circuit
Power supply voltage booster/halver
The power supply voltage booster/halver generates the operating voltage V
D2
for the voltage regula-
tor (LCD system voltage regulator). The S1C63616 allows software to control the power supply voltage
booster/halver and to select the power source of the voltage regulator.
Internal voltage regulator
This voltage regulator always operates to generate the V
D1
operating voltage for the internal logic cir-
cuits and OSC3 oscillation circuit.
Oscillation system voltage regulator
This voltage regulator always operates to generate the V
OSC
voltage for driving the OSC1 oscillation
circuit.
LCD system voltage regulator
The LCD system voltage regulator generates the LCD drive voltages V
C1
to V
C5
. See Chapter 7, "Elec-
trical Characteristics" for the voltage values. In the S1C63616, the LCD drive voltage is supplied to the
built-in LCD driver which drives the LCD panel connected to the SEG and COM terminals.
Note: Be sure not to use the V
D1
,V
D2
, V
OSC
and V
C1
to V
C5
terminal output voltages to drive external
circuits.