EVK-NINA-B3 - User Guide
UBX-17056481 - R03
Product description
Page 14 of 31
1.7.1
Arduino shield compatibility
The EVK-NINA-B3 has an I/O voltage range of 1.7-3.6 V. It can therefore be used only with shields that
also support an I/O voltage within this range.
The EVK-NINA-B3 has a pinout that is compatible with some Arduino or Arduino inspired shields. This
section describes the features of the EVK pins that a shield must comply with:
•
IOREF: The I/O voltage level of the NINA-B3 module is 3.3 V by default, but the EVK can be modified
to allow other voltages (1.7-3.6 V).
•
RESET: Is connected to the RESET button (SW0).
•
3.3 V: A regulated 3.3 V output. Should not be used as a voltage supply input, use the VIN pin
instead.
•
5 V: Is only a 5 V supply output if the EVK is being powered by USB. If any other power configuration
is used, this pin will be unconnected (floating). It is safe to connect an external 5 V supply to this
pin even when a USB cable is connected. This pin cannot be used to power the board, use the VIN
pin instead.
•
VIN: May be used as a 5 -12 V supply input to power the EVK-NINA-B3.
•
Pin 0 (RX): Is connected to the NINA-B3 UART RX pin (NINA pin 23).
•
Pin 1 (TX): Is connected to the NINA-B3 UART TX pin (NINA pin 22).
Note on SCL/SDA:
On some Arduino boards, the I
2
C signals, SCL, and SDA are connected to the pins
A4 and A5 and to the SCL and SDA pins in the top right hand corner. Since these pins will be shorted
together it might cause problems when connected to the EVK-NINA-B3, which has not shorted these
pins together.
Note on digital I/O pins:
Some of the digital I/O pins can be connected to the on-board debug MCU,
thus allowing serial communication and flashing/debugging over USB. This can cause interference on
the signals that are also used by an Arduino shield. See section 1.10 on how to disconnect these
signals from the debug MCU.
1.8
Raspberry Pi compatible interface
The EVK-NINA-B3 includes a 40-pin GPIO header that can be used to interface with either a Raspberry
Pi computer board or with a Raspberry Pi expansion board (HAT). The EVK-NINA-B3 uses different
hardware and software configurations depending on if it is connected to a Pi or a HAT; the differences
are covered in this section. The default configuration is to connect to a Pi.
Not all the Raspberry Pi versions and HATs are supported, since it requires the 40-pin GPIO header,
which older versions did not have. Table 9 lists the compatible Raspberry Pi versions.
Compatible Raspberry Pi boards
Raspberry Pi 1 Model A+
Raspberry Pi 1 Model B+
Raspberry Pi 2 Model B
Raspberry Pi 3 Model B
Raspberry Pi Zero
Raspberry Pi Zero W
Table 9: Compatible Raspberry Pi boards
