S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 233
S1D1
Manufacturer Part Number
S1D1
Description
LCD Controller-driver With Built-in Character ROM
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D1.pdf
(612 pages)
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S1D15600/601/602 Series
* Precautions when installing the COG
When installing the COG, it is necessary to duly consider
the fact that there exists a resistance of the ITO wiring
occurring between the driver chip and the externally
connected parts (such as capacitors and resistors). By the
influence of this resistance, non-conformity may occur
with the indications on the liquid crystal display.
Therefore, when installing the COG design the module
paying sufficient considerations to the following three
points.
1.
2.
3.
Also, as for this driver IC, pay sufficient attention to the
following points when connecting to external parts for
the characteristics of the circuit.
1.
Exemplary connection diagram 1.
7–38
Suppress the resistance occurring between the driver
chip pin to the externally connected parts as much as
possible.
Suppress the resistance connecting to the power
supply pin of the driver chip.
Make various COG module samples with different
ITO sheet resistance to select the module with the
sheet resistance with sufficient operation margin.
Connection to the boosting capacitors The boosting
capacitors (the capacitors connecting to respective
CAP pins and capacitor being inserted between
V
by use of the transistor with very low ON-resistance
of about 10 . However, when installing the COG,
OUT
V
and V
DD
C
C
C
C
C
2
2
2
2
2
R
SS2
4
R
4
) of this IC are being switched over
R
4
R
4
V
V
V
V
V
V
DD
1
2
3
4
5
EPSON
2.
Indicated below is an exemplary connection diagram of
external resistors.
Please make sufficient evaluation work for the display
statuses with any connection tests.
Exemplary connection diagram 2.
the resistance of ITO wiring is being inserted in
series with the switching transistor, thus dominating
the boosting ability.
Consequently, the boosting ability will be hindered
as a result and pay sufficient attention to the wiring
to respective boosting capacitors.
Connection of the smoothing capacitors for the
liquid crystal drive
The smoothing capacitors for the liquid crystal
driving potentials (V
indispensable for liquid crystal drives not only for
the purpose of mere stabilization of the voltage
levels. If the ITO wiring resistance which occurs
pursuant to installation of the COG is supplemented
to these smoothing capacitors, the liquid crystal
driving potentials become unstable to cause non-
conformity with the indications of the liquid crystal
display. Therefore, when using the COG module,
we definitely recommend to connect reinforcing
resistors externally.
Reference value of the resistance is 100k to 1M .
Meanwhile, because of the existence of these
reinforcing resistors, current consumption will
increase.
V
DD
C
C
C
C
C
2
2
2
2
2
R
R
4
4
1
. V
V
V
V
V
V
V
DD
1
2
3
4
5
2
, V
3
and V
Rev. 4.6
4
) are
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