NT3881D
Dot Matrix LCD Controller and Driver
1
V2.5
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 +4.5 to +5.5V supply
!
LCD driver power supply: V
1
- V
5
(V
DD
+0.3 - V
DD
-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.
NT3881D
5
V2.5
Pin and Pad Descriptions
Pin and Pad No.
Designation
I/O
External
Connection
Description
1 - 22
SEG22 - SEG1
O
LCD panel
Segment signal output pins
24, 25
OSC1, OSC2
Pins connected to resistor or ceramic filter for
internal clock oscillation. For external clock
operation, clock inputs to OSC1.
26 - 30
V
1
- V
5
P
Power supply
Power supply for LCD driver
31
CL1
O
NT3882
Clock to latch serial data D sent to NT3882.
32
CL2
O
NT3882
Clock to shift serial data D
33, 81
VDDB, VDDA
P
Power supply
V
DD
: +5V
A-Type waveform: V
DD
bond to VDDA
B-Type waveform: V
DD
bond to VDDB
23
GND
P
Power supply
GND: 0V
34
M
O
NT3882
Switch signal to convert LCD drive waveform to
AC
35
D
O
NT3882
Character pattern data corresponding to each
common signal is transmitted serially from this
output. 0-Non selection, 1-selection.
36
RS
I
MPU
Register select signal
0: Instruction register (write)
Busy flag, address counter (read)
1: Data register (write, read)
37
R/W
I
MPU
Read/Write control signal
0: Write
1: Read
38
E
I
MPU
Read/Write start signal
39 - 42
DB0 - DB3
I/O
MPU
Lower 4 tri-state bi-directional data bus for
transmitting data between MPU and NT3881D.
Not used during 4-bit operation.
43 - 46
DB4 - DB7
I/O
MPU
Higher 4 tri-state bi-directional data bus for
transmitting data between MPU and NT3881D.
DB7 is also used as busy flag.
47 - 62
COM1 - COM16
O
LCD panel
Common signal output pins
63 - 80
SEG40 - SEG23
O
LCD panel
Segment signal output pins
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