Hardware description
Switches U3 and U5 break the connection of the UART lines and SWD/RESET lines. In addition, the
signal controls the routing of the RESET signal depending on user preference when the interface MCU is
connected/disconnected.
• When the interface MCU is connected, shorting SB46 will connect the RESET pin in the Arduino
interface to the BOOT input of the interface MCU.
• Shorting SB43 will connect the RESET pin in the Arduino interface to the IF Boot/Reset button.
When a shield is connected, there are two analog switches connecting the pull-up resistors to the I2C bus
lines (SDA and SCL). This function is using one ground pin on the Arduino shield to control the switch. This
feature can be disabled by cutting SB33. To permanently enable pull-up resistors, short SB32.
Figure 18: Solder bridges: Shield detect and reset behavior
5.5 External memory
The nRF5340 PDK board has a 64 Mb external flash memory. The memory is a multi-I/O memory
supporting both regular SPI and Quad SPI.
The memory is connected to the chip using the following GPIOs:
GPIO Flash memory pin Solder bridge for
memory use (default:
shorted)
Solder bridge for GPIO
use (default: open)
P0.18 CS SB13 SB23
P0.17 SCLK SB11 SB21
P0.13 SIO_0/SI SB12 SB22
P0.14 SIO_1/SO SB14 SB24
P0.15 SIO_2/WP SB15 SB25
P0.16 SIO_3/HOLD SB10 SB20
Table 3: Flash memory GPIO usage and connecting solder bridges
To use the GPIOs for a purpose other than the onboard external memory and have them available on the
P24 connector, six solder bridges (SB10–SB15) must be cut and six solder bridges (SB20–SB25) must be
shorted. See the following figure for details.
Note: If debugging the QSPI communication is needed, the SB20–SB25 can be shorted without
cutting SB10–SB15, but the pins should not be driven externally.
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