Datasheet

31/5/2019 https://store.arduino.cc/usa/datasheet/index/index/url_key/nano-33-iot-with-headers-reseller/
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Please note: Arduino Nano 33 IoT only supports 3.3V I/Os and is NOT 5V tolerant so please make sure you are not directly connecting 5V signals to this board or
it will be damaged. Also, as opposed to Arduino Nano boards that support 5V operation, the 5V pin does NOT supply voltage but is rather connected, through a
jumper, to the USB power input.
The communication on WiFi and Bluetooth is managed by a NINA W102 ESP32 based module. The module is connected to the SAMD21 microcontoller with an
SPI BUS and a serial port through the following pins:
SAMD21 Pin SAMD21 Acronym NINA Pin NINA Acronym Description
13 PA8 19 RESET_N Reset
39 PA27 27 GPIO0 Attention Request
41 PA28 7 GPIO33 Acknowledge
23 PA14 28 / 21 GPIO5 / GPIO19 SPI CS / UART RTS
24 PA15 29 / 20 GPIO18 / GPIO22 SPI CLK / UART CTS
22 PA13 1 GPIO21 SPI MISO
21 PA12 36 GPIO12 SPI MOSI
31 PA22 23 GPIO3 Processor TX -> Nina RX
32 PA23 22 GPIO1 NINA TX -> Processor RX
Some of the NINA W102 pins are connected to the 15+15 pins headers/pads and can be directly driven by the module's ESP32; in this case it is necessary that the
SAMD21 corresponding pins are aptly tri-stated. Below is a list of such signals:
SAMD21 Pin SAMD21 Acronym NINA Pin NINA Acronym Header Description
48 PB03 8 RESET_N A7
14 PA09 5 GPIO0 A6
8 PB09 31 GPIO33 A5/SCL
7 PB08 35 GPIO5 / GPIO19 A4/SDA
The IMU is a LSM6DSL and it is managed through I2C.
The crypto chip is an ATECC608A and has a supporting library that is used by the WiFiNINA library.
The board has a two 15 pins connectors - one on each side -, pin to pin compatible with the original Arduino Nano.
Pin Funcion Type Description
1 D13 Digital GPIO
2 +3V3 Power Out Internally generated power output to external devices
3 AREF Analog Analog Reference; can be used as GPIO
4 A0/DAC0 Analog ADC in/DAC out; can be used as GPIO
5 A1 Analog ADC in; can be used as GPIO
6 A2 Analog ADC in; can be used as GPIO
7 A3 Analog ADC in; can be used as GPIO
8 A4/SDA Analog ADC in; I2C SDA; Can be used as GPIO (*)