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The Power Supply Circuits
The power supply circuits are low-power consumption power supply circuits that generate the voltage levels required
for the liquid crystal drivers. They comprise Booster circuits, voltage regulator circuits, and voltage follower circuits.
They are only enabled in master operation.
The power supply circuits can turn the Booster circuits, the voltage regulator circuits, and the voltage follower circuits
ON of OFF independently through the use of the Power Control Set command. Consequently, it is possible to make an
external power supply and the internal power supply function somewhat in parallel. Table 7 shows the Power Control
Set Command 3-bit data control function, and Table 8 shows reference combinations.
Table 7 The Control Details of Each Bit of the Power Control Set Command
D2 Booster circuit control bit
D1 Voltage regulator circuit (V regulator circuit) control bit
D0 Voltage follower circuit (V/F circuit) control bit
Use Settings
Only the internal power supply is
1
used
Only the V regulator circuit and
2
the V/F circuit are used
Only the V/F circuit is used
3
Only the external power supply is
4
used
* The "step-up system terminals" refer CAP1+, CAP1–, CAP2+, CAP2–, and CAP3–.
* While other combinations, not shown above, are also possible, these combinations are not recommended
because they have no practical use.
The Step-up Voltage Circuits
Using the step-up voltage circuits equipped within the S1D10605 Series chips it is possible to product a Quad step-up,
a Triple step-up, and a Double step-up of the V
Quad step-up: Connect capacitor C
CAP3–, and between V
terminal that is 4 times the voltage level between V
Triple step-up: Connect capacitor C
V
, and short between CAP3– and V
OUT
terminal that is 3 times the voltage difference between V
Double step-up: Connect capacitor C
and short between CAP2–, CAP3– and V
terminal that is twice the voltage between V
The step-up voltage relationships are shown in Figure 7.
Rev.2.1
Item
Table 8 Reference Combinations
Step-up
D2 D1 D0
circuit
1
1
1
0
1
1
0
0
1
0
0
0
– V
voltage levels.
DD
SS2
between CAP1+ and CAP1–, between CAP2+ and CAP2–, between CAP1+ and
1
and V
, to produce a voltage level in the negative direction at the V
SS2
OUT
between CAP1+ and CAP1–, between CAP2+ and CAP2– and between V
1
to produce a voltage level in the negative direction at the V
OUT
between CAP1+ and CAP1–, and between V
1
to produce a voltage in the negative direction at the V
OUT
DD
EPSON
V
V/F
regulator
circuit
circuit
O
O
X
O
X
X
X
X
and V
.
DD
SS2
and V
.
DD
SS2
SS2
and V
.
SS2
S1D10605 Series
Status
"1"
"0"
ON
OFF
ON
OFF
ON
OFF
Step-up
External
voltage
voltage
system
input
terminal
O
V
Used
SS2
O
V
, V
Open
OUT
SS2
O
V
, V
Open
5
SS2
X
V
to V
Open
1
5
SS2
and V
, leave CAP2+ open,
OUT
OUT
and
OUT
OUT
23
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