NBSN95 NB-IoT Sensor Node

Overview

The Dragino NBSN95 NB-IoT Sensor Node for IoT allows users to develop applications with NB-IoT connectivity via the Quectel BC95-G. Dragino NBSN95 enables a wide diversity of applications by exploiting low-power communication, ARM® Cortex®-M0 core-based STM32L0 Series features.

This kit provides:

  • STM32L072CZ MCU

  • Quectel BC95-G NB-IoT

  • Expansion connectors

    • PMOD

  • Li/SOCI2 Unchargable Battery

  • GPIOs exposed via screw terminals on the carrier board

  • Housing

More information about the board can be found at the Dragino NBSN95 website.

Hardware

The STM32L072CZ SoC provides the following hardware IPs:

  • Ultra-low-power (down to 0.29 µA Standby mode and 93 uA/MHz run mode)

  • Core: ARM® 32-bit Cortex®-M0+ CPU, frequency up to 32 MHz

  • Clock Sources:

    • 1 to 32 MHz crystal oscillator

    • 32 kHz crystal oscillator for RTC (LSE)

    • Internal 16 MHz factory-trimmed RC (±1%)

    • Internal low-power 37 kHz RC (±5%)

    • Internal multispeed low-power 65 kHz to 4.2 MHz RC

  • RTC with HW calendar, alarms and calibration

  • Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors

  • 11x timers:

    • 2x 16-bit with up to 4 channels

    • 2x 16-bit with up to 2 channels

    • 1x 16-bit ultra-low-power timer

    • 1x SysTick

    • 1x RTC

    • 2x 16-bit basic for DAC

    • 2x watchdogs (independent/window)

  • Up to 84 fast I/Os, most 5 V-tolerant.

  • Memories

    • Up to 192 KB Flash, 2 banks read-while-write, proprietary code readout protection

    • Up to 20 KB of SRAM

    • External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories

  • Rich analog peripherals (independent supply)

    • 1x 12-bit ADC 1.14 MSPS

    • 2x 12-bit DAC

    • 2x ultra-low-power comparators

  • 11x communication interfaces

    • USB OTG 2.0 full-speed, LPM and BCD

    • 3x I2C FM+(1 Mbit/s), SMBus/PMBus

    • 4x USARTs (ISO 7816, LIN, IrDA, modem)

    • 6x SPIs (4x SPIs with the Quad SPI)

  • 7-channel DMA controller

  • True random number generator

  • CRC calculation unit, 96-bit unique ID

  • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™

More information about STM32L072CZ can be found here:

Supported Features

The dragino_nbsn95 board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

Dragino NBSN95 Board has GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.

Available pins:

For detailed information about available pins please refer to Dragino NBSN95 website.

Default Zephyr Peripheral Mapping:

  • UART_1_TX : PB6

  • UART_1_RX : PB7

  • UART_2_TX : PA2

  • UART_2_RX : PA3

System Clock

Dragino NBSN95 System Clock is at 32MHz,

Serial Port

Dragino NBSN95 board has 2 U(S)ARTs. The Zephyr console output is assigned to UART1. Default settings are 115200 8N1.

Programming and Debugging

The dragino_nbsn95 board supports the runners and associated west commands listed below.

flash debug

Applications for the dragino_nbsn95 board configuration can be built and flashed in the usual way (see Building an Application and Run an Application for more details).

Flashing

Dragino NBSN95 board requires an external debugger.

Flashing an application to Dragino NBSN95

Here is an example for the Hello World application.

Connect the Dragino NBSN95 to a STLinkV2 to your host computer using the USB port, then run a serial host program to connect with your board. For example:

$ minicom -D /dev/ttyACM0

Then build and flash the application:

# From the root of the zephyr repository
west build -b dragino_nbsn95 samples/hello_world
west flash

You should see the following message on the console:

$ Hello World! dragino_nbsn95

Debugging

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b dragino_nbsn95 samples/hello_world
west debug