Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
S03858–21–0105
Van Nuys, California
Scale: NONE
Rev B
Sheet 6
2.0
LOGICAL STRUCTURE AND FUNCTION
2.1
LCD Module
Figure 1 illustrates the major components of the serial option Daystar Nova module. The module provides
means for an external viewing angle adjustment potentiometer (V
BIAS
Adj.) at Pin 4, and connections for optional
RESET and self–test switches at Pins 3 and 5. The external viewing angle adjustment potentiometer should be
connected to the same +5 Volt supply as the display module. RESET and TEST pull down to ground to
activate the function. All three inputs may be left open if not used. The V
BIAS
test point is used at the factory to
preset the viewing angle. The LCD Controllers are microprocessor units (MPU) designed specifically to control
all multiplexing and character decoding functions for the LCD display.
E
RS R/W
DB
7
DB
4
DB
DB
3
0
LCD Controllers
LCD Row Drivers and
Shift Registers
LCD Column Drivers
and Shift Registers
LCD Display
Temperature Compensation
V
CC
(+5V)
Gnd
EL Backlight
6" Flying Leads
Figure 1
Module Block Diagram
2.1.1
Signal Description
Signal Name
Number Of Lines
Input/Output
Connected
RS
1
I
MPU1/MPU2
R/W
1
I
MPU1/MPU2
E
1
I
MPU1
E
1
I
MPU2
DB
4
–DB
7
4
I/O
MPU1/MPU2
DB
0
–DB
3
4
I/O
MPU1/MPU2
V
CC
2
–
Power
GND
7
–
–
