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The +3.3V and +5V used by some devices on the COM Express™ evaluation carrier board are generated onboard only if 12V DC input (M2,
M7) is used and ATX power connector not plugged in. Otherwise the voltages +3.3V and +5V are delivered by ATX power supply with voltage
regulators disabled.
The voltages used are the +3.3V and +5V. The ‑5V is not available and the ‑12V is not used.
The following table lists the pinout for connector X70.
Connector X70 Pinout
Table 2
Pin Signal
Description
1
+3.3V
Power Supply +3.3VDC
2
+3.3V
Power Supply +3.3VDC
3
GND
Power Ground
4
+5V
Power Supply +5VDC
5
GND
Power Ground
6
+5V
Power Supply +5VDC
7
GND
Power Ground
8
PWR_OK Power Ok: A status signal generated by the power supply
to notify the computer that the DC operating voltages are
within the ranges required for proper computer operation.
5V_SB
9
Standby Power Supply +5VDC
10
+12V
Power Supply +12DC
11
+12V
Power Supply +12DC
12
+3.3V
Power Supply +3.3VDC
Copyright © 2012 congatec AG
ATX Power
X70
Pin Signal
Description
13
+3.3V
Power Supply +3.3VDC
14
‑12V
Power Supply ‑12DC
15
GND
Power Ground
16
PS_ON# Power Supply On (active low). Short this pin to GND to switch
power supply ON, disconnect from GND to switch OFF.
17
GND
Power Ground
18
GND
Power Ground
19
GND
Power Ground
20
NC
21
+5V
Power Supply +5VDC
22
+5V
Power Supply +5VDC
23
+5V
Power Supply +5VDC
24
GND
Power Ground
CEVA_c_m10
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