Flat surface light source offers simple and even illumination over large area.
z Max.1.3mm thickness ( Max.
1.5mm for lead portion )
z
Wide driving condition, 601,000Hz at 150V AC Max. With
inverter, step-up voltage from
1.5V battery is available.
z
Emitted colors are blue-green,
yellow-green and white.
z Operating characteristics of
PC2002-A SERIES is 110V,
400Hz, 8mA, ( Ta=20°C, 60%
RHæ)
z
Temperature Range:
{ Operating 0°C~ +50°C
{
Storage -20°C~ +60°C
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Inverter for EL Backlight Drive:
z Requires an inverter to operate the EL panel with a battery or DC power supply.
z
Low inverter loss and high light efficiency since it is designed for EL backlight.
z Constant power consumption during operation, given temperature change for extended
hours. This is characterized by the constant sup ply current, which minimizes the
brightness change of the EL panel.
CCFL Backlight( Cold Cathode Fluorescent Lamp )
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Bright
white
color
of
light
source
offers
clear
and
even
illumination
over
large
viewing
area.
Features:
{
High
Brightness
{ Long life time.
{
Low Power consumption
{ White color emitted
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Direct Illumination
{ Suitable for multi-color and / or dot matrix LCDP.
Edge
Illumination
{ Thin
structure
type
of
even
illumination
emits
light
from
tube
like
light source over a large area.
Precaution
{ Inverter for CCFL use output high pressure AC current. Therefore, please pay
attention when you handleinverter and power supply cable of LCD backlight.
LED Backlight
Long life, low power consumption and requires a simple power supply. Available colors
are red, green and orange, available in array type illumination or edge illumination.
Features:
{ Low driving voltage ( DC ) and does not require an inverter.
{
Long life of 100,000 hours ( average )
{ No noise occurrence.
Various colors available in red, green and orange etc. (multi-color by alternative switch is
also available)
{ Operating characteristics of PC2002-A series is 4.2V, 210mA, 250cd/m
Array
Illumination
{ A
grid
array
of
leaÍs
provide
even
illumination.
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Edge Illumination
{ Combination LED with a light guide offers a thin structure type of illumination.
The internal reset circuit will be operating properly when the following power supply conditions are
satisfied. If it is not operating properly, please perform the initial setting along with the instruction.
Item
Measuring
Symbol
Condition
Standard Value
Min. Typ. Max.
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Power Supply RISE
Time
Power Supply OFF
Time
Reset function
Initialization made by internal reset circuit
{
The HD44780 automatically initializes (resets) when power is supplied (builtin internal reset
circuit).
{ The following instructions are executed during initialization.
The busy flag (BF) is kept in busy state until initialization ends. (BF=1) The busy
state is 10ms after Vdd reaches 4.5V.
1. Display clear
2. Function set
DL=1:8 bit long interface data
DL=0:4 bit F=0:5 * 7 dots character font
N=1:2 lines
N=0:1 line
3. Display ON/OFF control
D=0:Display OFF C=0:Cursor OFF
B=0:Blink OFF
4. Entry mode set
1/D= 1:+1(increment) S=0:No shift
trse
toff
-----
-----
0.1 -----
1
-----
10
-----
mS
mS
Note: When the power supply conditions, using internal reset circuit is not satisfied,
the internal reset circuit will not function properly and initialization will not be
performed.Please initialize using the MPU along with the instruction set.
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Initialization along with instruction
If power supply conditions are not satisfied, for the proper operation of the internal reset circuit, it
is necessary to initialize using the instructions.
z Example of interfacing to a 4-bit MPU
z If interface data is 4-bits long
z If interface data is 8-bits long
Example of interfacing to an 8-bit MPU(Z80)
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Example of interface to a 4-bit MPU
Interface to a 4-bit MPU can be made through the I/O port of the 4-bit MPU. If there are sufficient I/O ports,
data can be transferred at 8-bit cycles, however, if there are not, data transfer can be accomplished by two
cycles of 4-bit transfers (select interface as 4-bits long). Please take into account that 2 cycles of the BF check
will be necessary and the timing sequence will prove to be complicated.
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Page 2 of 3Powertip Technology, Inc.
Features:
1. Interface to an 8-bit or 4-bit MPU is available.
2. 192 types of alphanumerics, symbols and special characters can be displayed with the multi
built-in character generator(ROM).
3. Other preferred characters can be displayed by character generator(RAM)
5. Compact and light weight design which can easily be integrated into end products.
6. single power supply +5V drive(except for extended temp. type).
7. Low power consumption.
Interface between data bus line and 4-bit or 8-bit MPU is available.
Data transfer requires two cycles in case of a 4-bit MPU, and once in case of an 8-bit
MPU.
If Interface Data Is 4-bit long
z
Data transfer is accomplished through 4 bus lines from DB4 to DB7.(while the rest of 4 bus lines from
DB0 to DB3 are not used.)
z Data transfer is completed when 4-bits of data is transferred twice.(upper 4-bits of data, then lower 4-
bits of data.)
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If Interface Data Is 8-bits Long
z Data transfer is made through all 8 bus lines from DB0 to DB7.
1. Adjusting the contrast of a character LCD module.
There are two means of adjusting the contrast: Please refer to the following drawing:
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1. Internal: J2 short, add the appropriate resister to R7 for contrast control.
2. External: J1 short, R7=0, By adding a VR the contrast can be controlled externally.
Please note the following diagram:
2. Connecting and powering the backlight.
There are two means of connecting and powering the backlight. Please refer to the below
diagrams:
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1. PINS 1 & 2 (Vdd & Vss): J3 short, by adding a resistor on R9.
2. PINS 15 & 16: J4 short, by adding a resistor on R8.
NOTE: The brightness can be controlled by the value of R8 or R9.
3. Reference table for establishing the relationship between the temperature
range, viewing direction and type of polarizer:
4. Differences between a driver IC, a controller IC and a controller/driver IC:
Driver IC
a "segment" driver. Common drivers output signals to create the rows or number of
lines while the segment drivers output the necessary signals to create the characters
or columns.
Controller IC
stores this data in RAM. This data is then converted into a serial character pattern and
transferred to the LCD driver IC.
Driver/Controller IC
data from the MPU and stores it in RAM. It accepts commands directly from the MPU
for both the common and segment drivers.
: There are two types of driver IC's. One is a "common" driver and the other
: This IC receives data written in ASCII or JIS code from the MPU and
: It is most commonly found in a graphics module. It receives
5. Following is the minimum dot size and pitch on the LCD, the ITO line on
the LCD and the elastomer (zebra) connector:
ITEM
LCD Dots0.22mm0.02mm
LCD ITO linesS=0.075, C=0.08mm0.03mm