S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 287

• Manufacturer Part Number: S1D1
• Description: LCD Controller-driver With Built-in Character ROM
• Manufacturer: Epson Electronics America, Inc.

S1D15605 Series
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
The Step-up Voltage Circuits
Using the step-up voltage circuits equipped within the
S1D15605 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 C1 between CAP1+
Triple step-up: Connect capacitor C1 between CAP1+
8–32
* 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
DD
1
2
3
4
because they have no practical use.
Only the internal power supply is
used
Only the V regulator circuit and
the V/F circuit are used
Only the V/F circuit is used
Only the external power supply is
used
– V
SS2
and CAP1–, between CAP2+ and CAP2–,
between CAP1+ and CAP3–, and between
V
in the negative direction at the V
terminal that is 4 times the voltage level
between V
and CAP1–, between CAP2+ and CAP2–
and between V
between CAP3– and V
voltage level in the negative direction at the
V
voltage levels.
Use Settings
SS2
OUT
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
and V
terminal that is 3 times the voltage
DD
OUT
and V
, to produce a voltage level
SS2
and V
SS2
.
OUT
OUT
Table 8 Reference Combinations
to produce a
D2 D1 D0
, and short
1
0
0
0
Item
1
1
0
0
OUT
EPSON
1
1
1
0
Step-up
circuit
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.
Double step-up:
The step-up voltage relationships are shown in Figure 7.
O
X
X
X
V
regulator
circuit
difference between V
CAP1+ and CAP1–, and between V
V
between CAP2–, CAP3– and V
produce a voltage in the negative direction
at the V
between V
O
O
X
X
OUT
, leave CAP2+ open, and short
OUT
V/F
circuit
DD
Connect capacitor C1 between
terminal that is twice the voltage
O
O
O
ON
X
“1”
ON
ON
and V
Status
V
External
voltage
input
V
OUT
OFF
OFF
OFF
V
SS2
“0”
5
1
DD
V
, V
SS2
to V
.
, V
and V
SS2
SS2
5
Step-up
voltage
system
terminal
SS2
Rev. 2.4a
Open
Open
Open
Used
.
OUT
SS2
and
to