Specifications

S1D15300 Series
Rev.1.4 EPSON 5–17
Reference setup value: S1D15300 V5
=
-7 to -9 V
S1D15301 V
5
=
-11 to -13 V (variable)
S1D15302 V
5
=
-11 to -13 V (variable)
SED1530 SED1531 SED1532
C1 1.0~4.7 uF 1.0~4.7 uF 1.0~4.7 uF
C2 0.22~0.47 uF 0.47~1.0 uF 0.47~1.0 uF
R1 700 KΩ 1 MΩ 1 MΩ
R2 200 KΩ 200 KΩ 200 KΩ
R3 1.6 MΩ 4 MΩ 4 MΩ
LCD 16 × 50 mm 32 × 64 mm 32 × 100 mm
SIZE
DOT 32 × 100 64 × 128 64 × 200
CONFIGURATION
Reset Circuit
When the RES input goes low, this LSI is initialized.
Initialized status
1. Display OFF
2. Normal display
3. ADC select: Normal display (ADC command D0 =
low)
4. Read modify write OFF
5. Power control register (D2, D1, D0) = (0, 0, 0)
6. Register data clear in serial interface
7. LCD power supply bias ratio 1/6 (S1D15300), 1/8
(S1D15301, SE1D15302)
8. Static indicator: OFF
9. Display start line register set at line 1
10. Column address counter set at address 0
11. Page address register set at page 0
12. Output status register (D3) = (0)
13. Electronic control register set at 0
14. Test command OFF
As seen in 11. Microprocessor Interface (Reference Example),
connect the RES pin to the reset pin of the microprocessor and
initialize the microprocessor at the same time.
In case the S1D15300 series does not use the internal LCD power
supply circuit, the RES must be low when the external LCD power
supply is turned on.
When RES goes low, each register is cleared and set to the above
initialized status. However, it has no effect on the oscillator circuit
and output pins (FR, CL, DYO, D0 to D7).
The initialization by RES pin signal is always required during
power-on. If the control signal from the MPU is HZ, an overcurrent
may flow through the IC. A protection is required to prevent the HZ
signal at the input pin during power-on.
Be sure to initialize it by RES pin when turning on the power supply.
When the reset command is used, only parameters 8 to 14 in the
above initialization are executed.
1: As the input impedance of V
R is high, a noise protection using
short wire and cable shield is required.
*2: C1 and C2 depend on the capacity of the LCD panel to be
driven. Set a value so that the LCD drive voltage may be stable.
[Setup example]
Turn on the voltage regulator and voltage follower and give an
external voltage to V
OUT. Display a horizontal-stripe LCD
heavy load pattern and determine C2 so that the LCD drive
voltage (V
1 to V5) may be stable. However, the capacity value
of C2 must be all equal. Next, turn on all the on-board power
supplies and determine C1.
*3: LCD SIZE means the length and breadth of the display portion
of the LCD panel.
Model LCD drive voltage
S1D15300 1/5 or 1/6 bias
S1D15301 1/6 or 1/8 bias
S1D15302
* 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. Suppress the resistance occurring between the driver chip pin to
the externally connected parts as much as possible.
2. Suppress the resistance connecting to the power supply pin of
the driver chip.
3. Make various COG module samples with different ITO sheet
resistance to select the module with the sheet resistance with
sufficient operation margin.
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. Connection to the boosting capacitors The boosting capacitors
(the capacitors connecting to respective CAP pins and capacitor
being inserted between V
OUT and VSS2) of this IC are being
switched over by use of the transistor with very low ON-
resistance of about 10Ω. However, when installing the COG,
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.
2. Connection of the smoothing capacitors for the liquid crystal
drive
The smoothing capacitors for the liquid crystal driving potentials
(V
1. V2, V3 and V4) are 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 100kΩ to 1MΩ.
Meanwhile, because of the existence of these reinforcing
resistors, current consumption will increase.
Indicated below is an exemplary connection diagram of external
resistors.
Please make sufficient evaluation work for the display statuses with
any connection tests.