Critical Link, LLC
www.CriticalLink.com
MityARM-335x Development Kit
www.MityDSP.com
12 April 2013
10
Copyright © 2007-2013, Critical Link LLC
Auxiliary / LCD Interface
– J401
The Auxiliary / LCD interface connector provides the necessary connections to connect
either an XGA or VGA display as well as pins to support touch screen controls. The
interface uses a standard 2mm 34 position male header. Table 3 defines the LCD
connector, J401, pin out which contains DVI signals that are routed directly from the
MityARM-335x to this connector.
There are also 5 interface pins that are used for the touch screen controls which can
support either SPI or Analog to Digital based interfaces depending on P400, P401 and
P402 jumper settings as defined in Table 3.
A ribbon cable using Molex 87568-3463 connector (or equivalent) can be used. There are
a variety of 2mm mating connectors that can be utilized.
Table 3: J401 Aux / LCD Interface Pin Description
Pin
Schematic Signal
SoM
Pin
Type
Standard
Notes
1
DVI R4
63
I/O
3.3V LVCMOS
Software configurable AM335x IO
2
DVI R3
61
I/O
3.3V LVCMOS
Software configurable AM335x IO
3
DVI R2
59
I/O
3.3V LVCMOS
Software configurable AM335x IO
4
DVI R1
57
I/O
3.3V LVCMOS
Software configurable AM335x IO
5
DVI R0
53
I/O
3.3V LVCMOS
Software configurable AM335x IO
6
DVI G5
51
I/O
3.3V LVCMOS
Software configurable AM335x IO
7
DVI G4
49
I/O
3.3V LVCMOS
Software configurable AM335x IO
8
DVI G3
47
I/O
3.3V LVCMOS
Software configurable AM335x IO
9
DVI G2
45
I/O
3.3V LVCMOS
Software configurable AM335x IO
10
DVI G1
43
I/O
3.3V LVCMOS
Software configurable AM335x IO
11
DVI G0
41
I/O
3.3V LVCMOS
Software configurable AM335x IO
12
DVI B4
39
I/O
3.3V LVCMOS
Software configurable AM335x IO
13
DVI B3
35
I/O
3.3V LVCMOS
Software configurable AM335x IO
14
DVI B2
33
I/O
3.3V LVCMOS
Software configurable AM335x IO
15
DVI B1
31
I/O
3.3V LVCMOS
Software configurable AM335x IO
16
DVI B0
29
I/O
3.3V LVCMOS
Software configurable AM335x IO
17
GND
-
Power
-
18
GND
-
Power
-
19
DVI CLK
65
I/O
3.3V LVCMOS
Software configurable AM335x IO
20
DVI DE
71
I/O
3.3V LVCMOS
Software configurable AM335x IO
21
DVI HSYNC
69
I/O
3.3V LVCMOS
Software configurable AM335x IO
22
DVI VSYNC
67
I/O
3.3V LVCMOS
Software configurable AM335x IO
23
GND
-
Power
-
24
GND
-
Power
-
25
+12V
-
Power
200mA max
Total external draw on 12V supply should
not exceed 800mA
26
+5.0V
-
Power
200mA max
Total external draw on 5V supply should not
exceed 1000mA
27
+3.3V
-
Power
200mA max
Total external draw on 3.3V supply should
not exceed 1000mA
28
BACKLIGHT_PWM
152
I/O
3.3V LVCMOS
Software configurable AM335x IO
29
SPI0 D1/A2D 0
185/184
I/O
3.3V or 0 to 10V ADC
Touch Screen SPI or ADC - Table 4
30
SPI0 D0/A2D 1
183/186
I/O
3.3V or 0 to 10V ADC
Touch Screen SPI or ADC - Table 4
31
SPI0 SCLK/A2D 2
187/188
I/O
3.3V or 0 to 10V ADC
Touch Screen SPI or ADC - Table 4
32
SPI0 CS0/A2D 3
191/190
I/O
3.3V or 0 to 10V ADC
Touch Screen SPI or ADC - Table 4
33
TS IRQ N/A2D 4
201/192
I/O
3.3V or 0 to 10V AD
Touch Screen SPI or ADC - Table 4
34
TS BUSY
203
I/O
3.3V LVCMOS
Software configurable AM335x IO
Note: These signals are pin-muxed in the CPU and may be available for a variety of functions.
