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NT3881DF-02 Schematic ( PDF Datasheet ) - ETC

Teilenummer NT3881DF-02
Beschreibung Dot Matrix LCD Controller and Driver
Hersteller ETC
Logo ETC Logo 




Gesamt 29 Seiten
NT3881DF-02 Datasheet, Funktion
NT3881D
Dot Matrix LCD Controller and Driver
Features
! Internal LCD drivers
16 common signal drivers
40 segment signal drivers
(can be externally extended to 400 segments
using NT3882)
! Maximum display dimensions
40 characters * 2 lines or
80 characters * 1 line
! Interfaces with 4-bit or 8-bit MPU
! Versatile display functions provided on chip:
Display Clear, Cursor Home, Display ON/OFF,
Cursor ON/OFF, Character Blinking, Cursor
Shift, and Display Shift
! Three duty factors, selected by PROGRAM:
1/8, 11/11, and 1/16
! Displays Data RAM (DD RAM): 80 X 8 bits
(displays up to 80 characters)
! Character Generator RAM (CG RAM):
64 X 8 bits for general data,
8 5 X 8 programmable dot patterns, or
4 5 X 10 programmable dot patterns
! Low voltage reset
! NOVATEK Identification code
! Bonding option for A-type and B-type waveform
! Character Generator ROM (CG ROM):
3 kinds of CG ROM sizes:
192 characters:
160 5 X 8 dot patterns
32 5 X 10 dot patterns
240 characters:
192 5 X 8 dot patterns
48 5 X 10 dot patterns
256 characters:
192 5 X 8 dot patterns
64 5 X 10 dot patterns
Custom CG ROM is also available
! Built-in power-on reset function
! Logic power supply: single +5V supply
! LCD driver power supply: V1 - V5
(VDD+0.3 - VDD-13.5)
! Three oscillator operations
(Freq. = 250KHz - 270KHz):
Internal oscillation
Ceramic resonator
External clock
! CMOS Process
! Available in 80-pin QFP or in CHIP FORM
General Description
The NT3881D is a dot matrix LCD controller and driver
LSI that can operate with either a 4-bit or an 8-bit
microprocessor (MPU). NT3881D receives control
character codes from the MPU, stores them in an internal
RAM (up to 80 characters), transforms each character
code into a 5 X 7, 5 X 8, or 5 X 10 dot matrix character
pattern, and then displays the codes on the LCD panel.
The built-in Character Generator ROM consists of 256
different character patterns.
The NT3881D also contains Character Generator RAM
where the user can store 8 different character patterns at
run time. These memory features make character display
flexible. NT3881D also provides many display instructions
to achieve versatile LCD display functions. The NT3881D
is fabricated on a single LSI chip using the CMOS
process, resulting in very low power requirements.
With several NT3882 driver ICs connected to the
NT3881D, up to 80 characters can be displayed.
1 V2.4






NT3881DF-02 Datasheet, Funktion
Functional Description
The NT3881D is a dot-matrix LCD controller and driver
LSI. It operates with either a 4-bit or an 8-bit
microprocessor (MPU). The NT3881D receives both
instructions and data from the MPU. Some instructions
set operation modes, such as the function mode, data
entry mode, and display mode; as well as some control
LCD display functions, such as clear display, restore
display, shift display, and cursor. Other instructions
include read and write both data and addresses. All
instructions allow users convenient and powerful functions
to control the LCD dot-matrix displays.
Data is written into and read from the Data Display RAM
(DD RAM) or the Character Generator RAM (CG RAM).
As display character codes, the data stored in the DD
RAM decodes a set of dot-matrix character patterns that
are built into the Character Generator ROM (CG ROM).
The CG ROM, with many character patterns (up to 256
patterns), defines the character pattern fonts. The
NT3881D regularly scans the character patterns through
the segment drivers. The CG RAM stores character
pattern fonts at run time if users intend to show character
patterns that are not defined in the CG ROM. This feature
makes character display flexible. Other unused bytes can
be used as general-purpose data storage.
The LCD driver circuit consists of 16 common signal
drivers and 40 segment signal drivers allowing a variety of
application configurations to be implemented. Additionally,
the user can extend display size by cascading the
segment driver LSI NT3882. The maximum display
dimensions can be either 80 characters in a 1-line display
or 40 characters in a 2-line display.
Character Generator ROM (CG ROM)
The character generator ROM generates LCD dot
character patterns from the 8-bit character pattern codes.
The NT3881D provides 3 CG ROM configurations:
1. 192 Characters:
The CG ROM contains 160 5 X 8 dot character patterns
and 32 5 X 10 dot character patterns. An example is the
NT3881D-01, in which the relation between the character
codes and character patterns is shown in Table 1. The
character codes from 00H to 0FH are used to get
character patterns from the CG RAM. Character codes
from 10H to 1FH and from 80H to 9FH map to full
NT3881D
character patterns. Character codes from E0H to FFH are
assigned to generate 5 X 10 dot character patterns, and
other codes are used to generate 5x8 dot character
patterns.
2. 240 Characters:
The CG ROM contains 192 5 X 8 dot character patterns
and 48 5 X 10 dot character patterns. An example of this
type is the NT3881D-02, in which the relation between the
character codes and character patterns is shown in Table
2.
The character codes from 00H to 0FH are used to get
character patterns from the CG RAM. Character codes
from 10H to 1FH and from E0H to FFH are assigned to
generate 5 X 10 dot character patterns, and other codes
to generate 5 X 8 dot character patterns. No null
character pattern exists in this type. Note that the
underlined cursor, displayed on the 8th duty may be
obscure if the 8th row of a dot character pattern is coded.
We recommend that users display the cursor in the
blinking mode if they code 5x8 dot character patterns is
their custom CG ROM.
3. 256 Characters:
The CG ROM contains 192 5 X 8 dot character patterns
and 64 5 X 10 dot character patterns. No adequate
example is presented here.
The only difference between this type and the just
mentioned second type is that the character codes from
00H to 0FH get character patterns from the CG ROM
rather than from the CG RAM. These character codes are
assigned to generate 5 X 10 dot character patterns. In this
application, the CG RAM would be employed as a
general-purpose data storage.
Custom character patterns are available by mask-
programming ROM. For convenience of character pattern
development, NOVATEK has developed a user-friendly
editor program for the NT3881D to help determine the
character patterns users prefer. By executing the program
on the computer, users can easily create and modify their
character patterns. By transferring the resulting files
generated by the program through a modem or some
other communication method, the user and NOVATEK
have established a reliable, fast link for programming the
CG ROM.
6 V2.4

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NT3881DF-02 pdf, datenblatt
B. Internal Oscillator (With Rf Resistor)
OSC1
OSC2
Rf: 91kohm + 2%
C. External Clock Operation
OSC1
PULSE INPUT
OSC2
Note 2 : Input/Output Terminals:
A. Input Terminal
Applicable Terminal : E (No Pull Up MOS)
NT3881D
Only Rf may be connected between OSC1 and OSC2.
The wire connection Rf must be as short as possible.
OSC1 and OSC2.
VDD
PMOS
NMOS
Applicable Terminals: RS, R/W (with Pull Up MOS)
PULL UP MOS
VDD
PMOS
VDD
PMOS
NMOS
12 V2.4

12 Page





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