OLIMEX© 2015
A20-SOM user's manual
OLIMEX sells additional and replacement male and female 0.05'' (50 mil) step connectors. We also
have a suitable cable named CABLE-40-40-10CM.
The only power line at the GPIO connectors that might be used as input is the one named '5VEXT'.
The rest of the power signals are outputs and it would be incorrect to try to power the board from
there.
6.5.1 GPIO-1 (General Purpose Input/Output) 40pin connector
GPIO-1 connector
Pin # Signal name
Processor pin
Pin # Signal name
Processor pin
1
+5V
-POWER CIRCUIT-
2
GND
-POWER CIRCUIT-
3
+3.0VA
-POWER CIRCUIT-
4
AGND
-POWER CIRCUIT-
5
+5V_OTG_PWR
-POWER CIRCUIT-
6
LINEINR
AB21
7
USB0-DRV
C12
8
LINEINL
AB20
9
USB0-VBUSDET
C5
10
HPOUTR
W19
11
USB0-IDDET
B5
12
HPOUTL
Y19
13
USB1-DRV
A4
14
HPCOM
AA19/AA20
15
USB2-DRV
A5
16
MICROPHONE
-MIC CIRCUIT-
17
UDP0
N21
18
MIC1OUTP
AC22
19
UDM0
N20
20
MIC1OUTN
AC23
21
UDP1
P21
22
MICIN2
AC21
23
UDM1
P20
24
LRADC0
AB23
25
UDP2
R21
26
LRADC1
AB22
27
UDM2
R20
28
TVIN0
AC18
29
PI0
A20
30
TVIN1
AB18
31
PI1
B20
32
TVOUT3
AB17
33
PI2
A19
34
VGA-R
AC17
35
PI3
B19
36
VGA-B
AB16
37
PI10
C17
38
VGA-G
AC16
39
PI11
D17
40
PI14
C15
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