P0071 Datasheet, PDF (16/43 Pages) Altera Corporation – DE2-115 with LCD Touch Panel and Camera

3.3 Using the 8” LCD Touch Screen Module
The tPad features an 8-inch Amorphous-TFT-LCD panel. The LCD Touch Screen module offers
resolution of (800x600) to provide users the best display quality for developing applications. The
LCD panel supports 18-bit parallel RGB data interface.
The tPad is also equipped with an Analog Devices AD7843 touch screen digitizer chip. The
AD7843 is a 12-bit analog to digital converter (ADC) for digitizing x and y coordinates of touch
points applied to the touch screen. The coordinates of the touch points can be read through the serial
port interface on the AD7843.
To display images on the LCD panel correctly, the RGB color data along with the data enable and
clock signals must act according to the timing specification of the LCD touch panel as shown in
Table 3-1.
Table 3-2 gives the pin assignment information of the LCD touch panel.
Parameter
CLK Frequency
CLK Period
CLK Pulse Duty
DE Period
DE Pulse Width
DE Frame Blanking
DE Frame Width
OEV Pulse Width
OKV Pulse Width
DE(internal)-STV Time
DE(internal)-CKV Time
DE(internal)-OEV Time
DE(internal)-POL Time
STV Pulse Width
Note: THS + THA < TH
Table 3-1 LCD timing specifications
Symbol
Min.
Values
Typ.
FCPH
-
39.79
FCPH
-
25.13
FCWH
40
50
FDEH+ TDEL
1000 1056
FDH
-
800
FHS
10
28
FEP
-
600
TOEV
-
150
TCKV
-
133
T1
-
4
T2
-
40
T3
-
23
T4
-
157
-
-
1
Max.
-
-
60
-
-
110
-
-
-
-
-
-
-
-
Unit
MHz
Ns
%
TCPH
TCPH
FDEH+TDEL
FDEH+TDEL
TCPH
TCPH
TCPH
TCPH
TCPH
TCPH
TH
Signal Name
LCD_DIM
LCD_NCLK
LCD_R0
LCD_R1
Table 3-2 Pin assignment of the LCD touch panel
FPGA Pin No. Description
PIN_P27
LCD backlight enable
PIN_V24
LCD clock
PIN_V26
LCD red data bus bit 0
PIN_R27
LCD red data bus bit 1
I/O Standard
2.5V
2.5V
2.5V
2.5V
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