S1D12200 Epson Electronics America, Inc., S1D12200 Datasheet - Page 25

• Manufacturer Part Number: S1D12200
• Description: S1d12000 Series Lcd Driver Ic Technical Manual Technical Manual
• Manufacturer: Epson Electronics America, Inc.

S1D12200 Series
Voltage Tripler Circuit
If capacitors are connected between CAP+1 – CAP–1
and CAP2+,CAP2– and V
is negatively tripled and generated at V
When the voltage is boosted double, open CAP2+ and
Voltage regulating circuit
Amplified voltage generated at V
voltage can be obtained from the expression
V
Where, V
V
Voltage regulation of V
a variable register between V
recommended to combine fixed registers R1 and R3 with
variable resistor R2 for fine adjustment of V
[Sample setting on R1, R2 and R3]
• R1 + R2 + R3 = 1.2 M ohm (decided from the current
• Variable voltage range provided by R2 is from –4V to
• Since V
2–16
value I
is supposed).
–6V (to be decided considering charecteristics of the
liquid crystal).
set at (0, 0, 0, 0, 0), followings are derived from above
conditions and expression
5
REG
<V
OUT
is maintained constantly at V
V
05
REG
5
REG
.calculated by the following formula:
passed between V
= (1 + R
= 2.0V, if the electronic volume register is
is the constant power supply within IC.
V
R
V
S1
b
a
DD
) • V
=
5
=0V
-2V
output is done by connecting to
SS
REG
V
DD
V
OUT
1
..............................
OUT
:
– V
R
=V
OUT
, V
, V
5
S1
REG
. Where, I
DD
DD
outputs liquid crystal drive voltage V
=-4V
OUT
– V
•
=
and V
•
Potential relationship of amplified voltage
2.0V.
SS
5
terminal.
1
voltage.
potential
05
5
. It is
1
5 A
below by adjusting the resistors Ra and Rb within the range of
EPSON
connect CAP2– to V
At this time, the oscillating circuit must be operating
since the amplifying circuit utilize the signal from the
oscillation output.
The voltage regulation circuit outputs V
temperature gradient of approximately –0.04%/ C.
Since V
measures must be considered including use of shortened
wiring distance and shield wire.
V
R
V
S1
a
R1 = 400K
R2 = 200K
R3 = 600K
DD
=
=0V
R
-2V
V
R
terminal has high input impedance, anti-noise
OUT
1
V
5
0
through the voltage regulation circuit.V
=3V
V
R
R
2
S1
OUT
=
V
REG
-6V
terminal.
+
R
-
3
R
b
V
DD
REG
Rev. 1.4
with the
V
5
5