EVK-NINA-B4 - User guide
UBX-19054587 - R03
Interfaces and peripherals
Page 24 of 38
C1 - Public
Conn.
Pin
No.
Arduino
pin
Description
Schematic
net name
nRF52
pin
Alternate functions and notes
J2
1
A0
Analog input
GPIO_25
P0.04
Analog function capable GPIO
2
A1
Analog input
GPIO_24
P0.30
Analog function capable GPIO
3
A2
Analog input
GPIO_27
P0.05
Analog function capable GPIO
4
A3
Analog input
SWITCH_2/
GPIO_18
P0.02
Analog function capable GPIO,
SWITCH_2 on NINA-B41.
This signal is pulled low when the
button SW2 is pressed
5
A4
Analog input
UART_DSR/
GPIO_17
P0.28
Analog function capable GPIO,
UART_DSR signal on NINA-B41
6
A5
Analog input
UART_DTR/
GPIO_16
P0.03
Analog function capable GPIO,
UART_DTR signal on NINA-B41
J3
1
D0/RX
Digital I/O, UART RX
UART_RXD/
GPIO_23
P0.29
UART_RXD signal on NINA-B41
2
D1/TX
Digital I/O, UART TX
UART_TXD/
GPIO_22
P1.05
UART_TXD signal on NINA-B41
3
D2
Digital I/O
UART_CTS/
GPIO_21
P0.23
UART_CTS signal on NINA-B41
4
D3
Digital I/O
UART_RTS/
GPIO_20
P0.31
UART_RTS signal on NINA-B41
5
D4
Digital I/O
GPIO_1
P0.13
6
D5
Digital I/O
GPIO_32
P0.11
7
D6
Digital I/O
GPIO_28
P0.09
Signal not connected by defualt,
configured for NFC use
8
D7
Digital I/O
GPIO_29
P0.10
Signal not connected by defualt,
configured for NFC use
J4
1
D8
Digital I/O
GPIO_33
P1.09
2
D9
Digital I/O
GPIO_46
P0.12
3
D10
Digital I/O
GPIO_2
P0.00
Disconnected by default
Connected to 32Khz 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
P0.01
Disconnected by default
Connected to 32Khz 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
P1.00
6
D13
Digital I/O
GPIO_45
P0.07
7
GND
Ground
GND
8
AREF
Analog reference voltage level
-
-
Not connected
9
SDA
I2C data signal
GPIO_4
P0.16
10
SCL
I2C clock signal
GPIO_5
P0.17
Table 11: Pinout of the Arduino UNO R3 compatible interface