u-blox EVK-NINA-B50, User Manual

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EVK-NINA-B50 - User guide
UBX-23007761 - R02 Interfaces and peripherals Page 25 of 37
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Figure 17: Pin header J14 that is compatible with the Raspberry Pi GPIO connectors
Conn. Pin no. Raspberry Pi pin Description NINA-B4 schematic
net name* K32W pin Alternate functions and notes
J14 1 3.3 V 3.3 V supply pin 3V3_PI - Not connected by default.See
also
Powering options .
2 5 V 5 V supply pin 5V - Cannot be used as supply input.
Supplied by USB VBUS and
protected from back powering.
3 GPIO02 Digital I/O GPIO_4 PTC4
4 5 V 5 V supply pin 5V - Cannot be used as supply input.
Supplied by USB VBUS and
protected from back powering.
5 GPIO03 Digital I/O GPIO_5 PTA19
6 GND Ground GND
7 GPIO04 Digital I/O GPIO_3 PTD5 Disconnected by default
Connected to 32Khz LPO clock.
To connect GPIO 3 to J4 header
instead of LPO clock, remove
R67 and add R65 (zero ohm
resistor)
8 GPIO14
Digital I/O, UART
TX/RX
RASP_TXD PTC2
Connected to NINA UART_RXD
pin by default. See also
UART .
9 GND Ground GND
10 GPIO15 Digital I/O, UART
RX/TX RASP_RXD PTC3 Connected to NINA UART_TXD
pin by default. See also
UART .
11 GPIO17 Digital I/O GPIO_2 PTD4 Disconnected by default
Connected to 32Khz LPO clock.
To connect GPIO 2 to J4 header
instead of LPO clock, remove
R66 and add R64 (0
Ω resistor)