20-101-0732 Rabbit Semiconductor, 20-101-0732 Datasheet - Page 30

• Manufacturer Part Number: 20-101-0732
• Description: INTERFACE SMART SCREEN OP7100
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-0732

• Module/board Type: Single Board Computer Module
• For Use With/related Products: OP7100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 20-101-732; 20-101-732

Liquid Crystal Display (LCD)
The 240 × 320 ¼ VGA LCD supports both graphics and text. Automatic
contrast control is built in so that the contrast, once set, does not drift as
the OP7100 warms up or is moved.
Figure 3-4 provides a block diagram of the LCD control and RAM circuits.
The LCD is connected to the OP7100
circuit board through header J1 or J3
on the circuit board.
Contrast Adjustment
Figure 3-5 shows the location of the
manual contrast adjustment. This con-
trast adjustment is the factory default for
the OP7110. The OP7100 is configured
with software contrast control as the fac-
tory default. With software contrast con-
trol, the contrast level may be set via a
software function call. Since it is hard
to guess the correct level in software,
buttons defined on the OP7100 touch-
screen and in software can be used to
adjust the contrast. A user-supplied key-
pad can facilitate this type of software
control for the OP7110.
30 Hardware
U3
A0
D[0–7]
/INT0
/RESET
VCC
SED1335F
LCD Control
VA[0–14]
ON/OFF
10 kΩ
VD[0–7]
XD[0–3]
FRAME
R26
Figure 3-4. Block Diagram LCD Control and Memory
2.5 kΩ
R31
VRAMCS1
VCC
U2
A[0–14]
D[0–7]
/CS
VCC
FRAME
ON/OFF
XD[0–3]
VCC
VEE
ADJUST
Figure 3-5. Location of OP7100
RAM
Manual Contrast Adjustment
LCD
VRAMCS2
VCC
U1
A[0–14]
D[0–7]
/CS
VCC
RAM
OP7100