S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 100

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

S1D15206 Series
When turning off the built-in power circuit, observe the following command sequence to mainyain power save status.
* 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.
4–16
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
switched over by use of the transistor with very low ON-
resistance of about 10 . However, when installing the COG,
When turning off the built-in
power supply:
Built-in power supply “OFF”
V
DD
C
C
C
C
C
Static drive “ON”
2
2
2
2
2
Display “OFF”
R
4
R
4
R
4
R
4
OUT
V
V
V
V
V
V
DD
1
2
3
4
5
and V
SS2
Command AEh
Command A5h
) of this IC are being
EPSON
Power save
command
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.
drive
The smoothing capacitors for the liquid crystal driving potentials
(V
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.
Connection of the smoothing capacitors for the liquid crystal
1
. V
2
, V
3
V
and V
DD
C
C
C
C
C
2
2
2
2
2
4
) are indispensable for liquid crystal drives
R
R
4
4
V
V
V
V
V
V
DD
1
2
3
4
5
Rev.3.5