S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 116

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

S1D15206 Series
10. EXTERNAL WIRINGS
Power Supply and LCD Power Circuit
If a single S1D15206 series chip is used and if on-board power supply is used and not used
4–32
R2
Parts list (Reference)
R1
R3
C1
Variable V
C
C2
2
If on-chip power supply is used
C 1
C 2
R 1
R 1
R 1
C1
C1
R
4
R
5
4
. =
. –9.3 to –6.2 V
V
CAP1+
CAP1 -
CAP2+
CAP2 -
V
V
V
V
V
V
V
V
R
OUT
SS
DD
1
2
3
4
5
R
4
R
4
0.1 to 1 F
0.1 to 1 F
S1D152
2.0 M
1.0 M
3.0 M
S1D1520
V
V
V
V
V
V
DD
1
2
3
4
5
, V
0
*******
*
D
****
M/S
V
DD
EPSON
Setting value for your reference: 100 k to 1 M .
In order to select an optimum value for resistor R4, you should
reference the LCD and the drive waveform.
Notes: 1. Because of high input impedance on V
Note: Use jumper and shielded wires
External
power
supply
2. C1 and C2 depend on size of the liquid crystal panel
3. In order to regulate the voltage, a capacitor must be
as the input impedance of VR
terminal is high.
wiring should made as short as possible and shielded
wire should be used for the wiring.
to be driven. The value to be selected for C1 and C2
must be able to stabilize the liquid crystal drive
voltage.
[A setting example]
Turn on the voltage regulator circuit and the voltage
follower circuit to apply voltage to V
Display the LCD heavy load patterns (horizontal
stripe-shaped), then select the C2 value that can
stabilize the liquid crystal drive voltages (V
All C2 capacity values selected, however, must be
the same. Then, turn on every built-in power
supplies and select an appropriate C1 value.
connected between V
If on-chip power supply is NOT used
V
V
V
V
V
V
V
V
CAP1+
CAP1 -
CAP2+
CAP2 -
V
DD
1
2
3
4
5
R
OUT
SS
S1D152
DD
and V
*******
SS
M/S
(near to the IC).
OUT
V
R
externally.
DD
terminal,
1
to V
Rev.3.5
5
).