21 board power supply connectors j44 and j45, 22 bt1 rtc backup battery socket, Board power supply connectors j44 and j45 – Kontron COMe Eval Carrier QorIQ User Manual
Page 31: Bt1 rtc backup battery socket, Atx main power j44 pinout, Atx 12v j45 pinout
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Quick Start Guide
COME-QEC-1
5.2.21 Board Power Supply Connectors J44 and J45
The COM Express® power supply follows the ATX 2.x specification and the baseboard should be supplied by connecting an ATX
PSU with a 24-pin ATX (J44) and a 4-pin ATX_12V (J45) supply cable. The 4-pin ATX_12V connector mainly supplies power to
the module.
Table 17: ATX Main Power J44 Pinout
Table 18: ATX 12V J45 Pinout
5.2.22 BT1 RTC Backup Battery Socket
The COME-QEC-1 is equipped with a battery socket BT1 which provides power to the VCC_RTC pin on the COM Express® connec-
tors. Suitable battery types are CR2025 and CR2032.
ATX MAIN
POWER
PIN
PIN
ATX MAIN
POWER
+3.3V
+3.3V sense
13
1
+3.3V
-12V
14
2
+3.3V
GND
15
3
GND
PS_ON#
16
4
+5V
GND
17
5
GND
GND
18
6
+5V
GND
19
7
GND
NC
20 8
PWR_OK
+5V
21
9
+5VSB
+5V
22
10
+12V
+5V
23
11
+12V
GND
24
12
+3.3V
PIN
ATX_12V
1
GND
2
GND
3
Module VCC (+12V nominal)
4
Module VCC (+12V nominal)