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CHAPTER 2: POWER SUPPLY AND INITIAL RESET
2 P
CHAPTER
2.1 Power Supply
With a single external power supply (∗) supplied to V
necessary internal voltages with the voltage doubler/halver and power divider.
∗ Supply voltage: S1C60N03 ... 3.0 V
Figure 2.1.1 shows the basic configuration of the power divider and voltage doubler/halver.
V
V
V
Fig. 2.1.1 Basic configuration of the power divider and voltage doubler/halver
The power divider and voltage doubler/halver generate the LCD drive voltage (V
circuit is configured according to the model and the LCD drive bias selected by mask option. The LCD
drive bias can be selected from 1/3 bias, 1/2 bias (A) and 1/2 bias (B).
For S1C60N03
When 1/3 bias or 1/2 bias (A) is selected, the power divider is used to generate V
the source voltage with the resistors. The voltage doubler/halver is not used. In the S1C60N03, this
selection can reduce the external component count.
When 1/2 bias (B) is selected in the S1C60N03, the voltage halver is used to generate V
power divider is disconnected. This selection can reduce current consumption, but two external capaci-
tors are necessary for the voltage halver.
In the S1C60N03, the voltage doubler is not used.
Figure 2.1.2 shows the power circuit configuration of the S1C60N03 according to the selected mask
option.
For S1C60L03
The S1C60L03 always uses the voltage doubler to generate the LCD drive voltage from 1.5 V source
voltage. The voltage halver is not used.
When 1/3 bias or 1/2 bias (A) is selected, the power divider is used to generate V
the V
voltage generated by the voltage doubler.
S2
When 1/2 bias (B) is selected in the S1C60L03, the power divider is not used.
Figure 2.1.3 shows the power circuit configuration of the S1C60L03 according to the selected mask option.
4
S
OWER
S1C60L03 ... 1.5 V
V
DD
Power
divider
L1
L2
L3
LON
UPPLY AND
through V
, the S1C60N03 Series generates the
DD
SS
Voltage
halver
(S1C60N03)
V
S2
Voltage
doubler
(S1C60L03)
Mask option
EPSON
I
R
NITIAL
ESET
V
DD
V
S2
CA
CB
V
SS
, V
, V
). The
L1
L2
L3
and V
by dividing
L1
L2
and V
L1
and V
by dividing
L1
L2
S1C60N03 TECHNICAL MANUAL
and the
L2
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