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3.3.1
ATX / AT Power Supply
With an ATX power supply, the SMARC
®
module starts after the power-on button M19 is pressed. To force the ATX power supply to always be
on, set jumper X53 to position 2-3. This setting is ideal for debugging purposes.
Table 1
ATX Power (Connector X51) Pinout Description
Pin Signal
Description
Pin Signal
Description
1
+3.3V
Power 3.3 VDC
13
+3.3V
Power 3.3 VDC
2
+3.3V
Power 3.3 VDC
14
-12V
Power Supply -12 VDC
3
GND
Power Ground
15
GND
Power Ground
4
+5V
Power 5 VDC
16
PS_ON# Power Supply On (active low). Short this
pin to GND to switch power supply ON,
disconnect from GND to switch OFF.
5
GND
Power Ground
17
GND
Power Ground
6
+5V
Power 5 VDC
18
GND
Power Ground
7
GND
Power Ground
19
GND
Power Ground
8
PWR_OK Power Ok
20
N.C
Not connected
9
5V_SB
Standby Power 5 VDC
21
+5V
Power 5 VDC
10
+12V
Power 12 VDC
22
+5V
Power 5 VDC
11
+12V
Power 12 VDC
23
+5V
Power 5 VDC
12
+3.3V
Power 3.3 VDC
24
GND
Power Ground
Table 2
Jumper X53 Description
Pin Configuration
1-2
ATX Mode (Default)
2-3
ATX PSU always on
Connector Type
X51: ATX 2.0 Power Connector
X53: 2.54 mm grid jumper
ATX Power Connector X51
2
3
1
Jumper X53