Specifications
2–18 EPSON Rev. 1.4
S1D12200 Series
Liquid crystal voltage generating circuit
V
5 potential is resistive divided within IC to produce V1,
V
2, V3 and V4 potentials required for driving the liquid
crystal. V
1, V2, V3 and V4 potentials are then subject to
impedance conversion and provided to the liquid crystal
drive circuit.
The liquid crystal drive voltage is fixed to 1/5 (1/4) bias.
The liquid crystal power terminals V
1 – V5 must be
externally connected with the voltage regulating capacitor
C2.
When a built-in supply is used
When voltage is doubled
When voltage is tripled
Reference setting values: C1: 0.1 - 4.7 µF We recommend the user to set the optimum values to capacitors C1
C2: 0.1 µF and C2 according to the panel size watching the liquid crystal display
and drive waveforms.
CAP1+
CAP1–
CAP2–
V
OUT
V
5
R3
R2
R1
V
DD
, V
0
C2
C2
C2
C2
C2
C2
V
1
V
2
V
3
V
4
V
5
V
S1
V
R
V
SS
C1
S1D12200D
****
CAP1+
CAP1–
V
OUT
V
5
R3
R2
R1
V
DD
, V
0
C2
C2
C2
C2
C2
C1
V
1
V
2
V
3
V
4
V
5
V
R
V
SS
S1D12200D
****
C1
C1
CAP2+
CAP2–
C1C1
V
S1