COM Express® + GPU Embedded System (VXG/DXG)
Users Guide
Document:
CTIM-00409
Revision:
0.12
Page 44 of 48
Connect Tech Inc. 800-426-8979 | 519-836-1291
Date:
2018-04-10
RTC Battery
This carrier has a Panasonic BR1225A/FA Lithium battery providing 3V@ 48mAh to VBAT. VBAT is the
supply for the RTC Clock of the COM Express module.
If the BR1225A is not sufficient for the application, an external battery can be connected to P19 with J4
selection jumper set appropriately.
For further information about RTC battery selection and life time estimation, see Application Note 00009
CTIN-00009 http://connecttech.com/pdf/CTIN-00009.pdf
Note: the battery ships with a non-conductive label to prevent accidental discharge. It can be removed before
installation.
Jumper – RTC Battery Selection (J4)
Function
RTC Battery Selection
Location
J4
Modes
Position
Description
EXT
External RTC Battery
LOC
On-Board RTC Battery
Jumper – RTC Battery Clear/Enable (J5)
Function
RTC Battery Clear/Enable
Location
J5
Modes
Position
Description
CLR
Clear RTC
EN
Enable RTC