External CMOS Battery
Chapter:
Connectors
Beckhoff New Automation Technology
CB3053
page 21
4.5 External CMOS Battery
For keeping the internal clock alive even if the rest of the board is switched off, an external battery can be
attached via a 2 pin connector (JST B2B-EH-A, mating connector: EHR-2).
Pin
Name
Description
1
BATT
battery 3.3 volt
2
GND
ground