Document
NT7605
Single-chip 20C X 2L Dot-Matrix LCD Controller / Driver
Features
! Internal LCD drivers 16 common signal drivers 100 segment signal drivers
! Maximum display dimensions 20 characters * 2 lines or 40 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, 1/11, 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 ! ITO option for A-type and B-type LCD waveform
! 2 kinds of LCD pads sequence ! Character Generator ROM (CG ROM):
2 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
Custom CG ROM is also available ! Built-in power-on reset function ! Logic power supply: 2.8V ~ 5.5V ! LCD driver power supply: V1 ~ V5
divided by Built-in LCD power division resister. ! Two oscillator operations
(Freq. = 500KHz - 540KHz):
• Built-in RC oscillation
• External clock ! CMOS Process ! Available in COG FORM
General Description
The NT7605 is a dot matrix LCD controller and driver LSI that can operate with either a 4-bit or an 8-bit microprocessor (MPU). NT7605 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 NT7605 also contains Character Generator RAM where the user can store 8 different character patterns at run time. These memory features make the character display flexible. NT7605 also provides many display instructions to achieve versatile LCD display functions. The NT7605 is fabricated on a single LSI chip using the CMOS process, resulting in very low power requirements.
1 V2.1
Pad Configuration
162 163
180 1
NT7605
5600µm
11 12 13 14
26 27 29 30
38 39
44 45
NT7605
83 82
1230µm
65 64
Item Chip size Pad pitch
Pad No. -
1 - 180
X 1230
Size 65
Y 5600
Unit µm
2
Block Diagram
NT7605
V1 V2 V3 V4 V5
VDD GND
OSC1 OSC2
INSTRUCTION 8 DECODE
7
8 INSTRUCTION REGISTER (IR)
ADDRESS COUNTER
RS
R/W E
7
I/O BUFFER
77
CURSOR ADDRESS COUNTER
DB7 ~ DB4 4
8
DATA REGISTER
(DR)
87
TIMING GENERATOR
7
LCD DRIVER VOLTAGE
GENERATOR
OPT_UD OPT_R0 OPT_R1 OPT_LCD
TEST
TESTM
7
DISPLAY DATA RAM
(DD RAM) 80 X 8 BITS
16-BIT SHIFT REGISTER
16
COMMON SIGNAL DRIVER
16
COM1 I
COM16
8
CURSOR /BLINK
8 CONTROLLER
DB3 ~ DB0 4
BUSY FLAG (BF)
CHARACTER GENERATOR
RAM (CG RAM) 64 X 8 BITS
5
CHARACTER GENERATOR ROM (CG ROM)
5
100-BIT LATCH CIRCUIT
100 SEGMENT SIGNAL DRIVER
100 SEG1 I
SE.