Hardware description
4.8 32.768 kHz crystal
The nRF5340 SoC can use an optional 32.768 kHz crystal (X2) for higher accuracy and lower average power
consumption.
On the nRF5340 DK, P0.00 and P0.01 are used for the 32.768 kHz crystal by default and are not
available as GPIO on the connectors.
Note: When using ANT/ANT+
™
, the 32.768 kHz crystal (X2) is required for correct operation.
If P0.00 and P0.01 are needed as normal I/Os, then the 32.768 kHz crystal can be disconnected and the
GPIO routed to the connectors. Cut the solder bridges on SB1 and SB2, and solder SB3 and SB4. See the
following figure for reference.
Figure 24: Configuring P0.00 and P0.01
P0.01
P0.00
SB3
SB4
SB1
SB2
P0.00/XL1
P0.01/XL2
X2
32.768kHz
Figure 25: 32.768 kHz crystal and SB1–SB4
4.9 Debug input and trace
The Debug in connector (P18) makes it possible to connect external debuggers when the interface MCU
USB cable is not connected, or the DK is in nRF only mode.
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