EVK-NINA-B50 - User guide
UBX-23007761 - R02
Interfaces and peripherals
Page 23 of 37
C1-Public
Conn.
Pin
No.
Arduino
pin
Description
NINA-B4
schematic
net name*
K32W
pin
Alternate functions and notes
8
VIN
External DC supply input, 5
–
12 VDC VIN
-
J2
1
A0
Analog input
GPIO_25
PTA20 Analog function capable GPIO
2
A1
Analog input
GPIO_24
PTC6
Analog function capable GPIO
3
A2
Analog input
GPIO_27
PTA21 Analog function capable GPIO
4
A3
Analog input
SWITCH_2/
GPIO_18
PTD3
Analog function capable GPIO,
SWITCH_2 on NINA-B501.
This signal is pulled low when the
button SW2 is pressed
5
A4
Analog input
UART_DSR/
GPIO_17
PTD2
Analog function capable GPIO,
UART_DSR signal on NINA-B501
6
A5
Analog input
UART_DTR/
GPIO_16
PTD1
Analog function capable GPIO,
UART_DTR signal on NINA-B501
J3
1
D0/RX
Digital I/O, UART RX
UART_RXD/
GPIO_23
PTC2
UART_RXD signal on NINA-B501
2
D1/TX
Digital I/O, UART TX
UART_TXD/
GPIO_22
PTC3
UART_TXD signal on NINA-B501
3
D2
Digital I/O
UART_CTS/
GPIO_21
PTB4
UART_CTS signal on NINA-B501
4
D3
Digital I/O
UART_RTS/
GPIO_20
PTB5
UART_RTS signal on NINA-B501
5
D4
Digital I/O
GPIO_1
PTA16
6
D5
Digital I/O
GPIO_32
PTA18
7
D6
Digital I/O
GPIO_28
-
Signal not connected by default.
8
D7
Digital I/O
GPIO_29
-
Signal not connected by default.
J4
1
D8
Digital I/O
GPIO_33
-
Signal not connected by default.
2
D9
Digital I/O
GPIO_46
PTA17
3
D10
Digital I/O
GPIO_2
PTD4
Disconnected by default
Connected to 32 KHz LPO Xtal.
To connect GPIO 2 to J4 header
instead of LPO Xtal, remove R66 and
add R64 (zero ohm resistor)
4
D11
Digital I/O
GPIO_3
PTD5
Disconnected by default
Connected to 32 KHz LPO Xtal.
To connect GPIO 3 to J4 header
instead of LPO Xtal, remove R67 and
add R65 (zero ohm resistor)
5
D12
Digital I/O
GPIO_8
PTC5
Blue LED
6
D13
Digital I/O
GPIO_45
SWITC
H_WAK
EUP_B
7
GND
Ground
GND
8
AREF
Analog reference voltage level
-
-
Not connected
9
SDA
I2C data signal
GPIO_4
PTC4
10
SCL
I2C clock signal
GPIO_5
PTA19
Table 11: Pinout of the Arduino UNO R3 compatible interface
*See
