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Chapter 3: Connecting the cpuModule 55
Optional RTC Battery Input (CN13)
The optional RTC battery input is the connection for an external backup battery. This battery is used by the
cpuModule when system power is removed in order to preserve the date and time of the real time clock.
Connecting a battery is only required to maintain time when power is completely removed from the
cpuModule. A battery is not required for board operation.
Reserved (CN15)
Reserved (CN15) should be left unconnected.
Table 27 Optional RTC Battery Input (CN13)
Pin
Signal
Function
1
BAT
RTC Battery Input
2
GND
Ground
WARNING
This optional RTC battery connector (
CN13
) should be left unconnected if the
Utility Port 2.0 connector (
CN5
) has a battery connected.
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