STMicroelectronics X-NUCLEO-IDB05A2

Overview

X-NUCLEO-IDB05A2 from STMicroelectronics is an Arduino UNO R3–compatible Bluetooth Low Energy expansion board built around the FCC- and IC-certified BlueNRG-M0A module (FCC ID: S9NBNRGM0AL; IC: 8976C-BNRGM0AL), supporting Bluetooth v4.2, simultaneous master/slave roles, SPI interface to STM32 Nucleo hosts, on-board chip antenna, and integrated RF oscillators.

For engineers reviewing the X-NUCLEO-IDB05A2 datasheet, X-NUCLEO-IDB05A2 pinout, X-NUCLEO-IDB05A2 application, or X-NUCLEO-IDB05A2 equivalent, this board enables rapid BLE sensor-to-cloud prototyping with configurable SPI clock/CS/IRQ lines, RoHS compliance, and seamless integration into STM32Cube-based firmware development flows.

Technical Context

The board implements a dedicated SPI interface between the host STM32 MCU and the BlueNRG-M0A network processor, with hardware-selectable SPI signal routing via zero-ohm resistors (e.g., R70, R80, R10) for CLK, CSN, and IRQ. It includes a 64-Kbit SPI EEPROM (M95640-RMC6TG) for persistent BLE configuration storage.

It integrates a 32.768 kHz external low-power oscillator (EXT_LPCLK) for BLE timing accuracy and supports dual connectivity modes: as a BLE peripheral (sensor node) or central (hub), enabled by the embedded BlueNRG-MS stack covering GAP, GATT, SM, L2CAP, LL, and RFPHY layers.

Key Specifications

Availability

X-NUCLEO-IDB05A2 is available at Aetrix Electronics and suitable for cloud-connected sensor nodes, factory automation gateways, smart farming edge devices, and wireless BLE hub applications requiring stable component supply and rapid evaluation-to-production transition.

Supply support for X-NUCLEO-IDB05A2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, sensors, power management, and connectivity solutions for industrial, automotive, and consumer markets.

The X-NUCLEO-IDB05A2 belongs to ST's Nucleo ecosystem expansion board family, engineered to accelerate Bluetooth Low Energy prototyping for STM32-based IoT endpoints and edge intelligence systems.

FAQ

What host microcontrollers is the X-NUCLEO-IDB05A2 compatible with?

The board is designed for STM32 Nucleo development boards with Arduino UNO R3 and ST morpho headers. It interfaces exclusively via SPI and requires GPIO for IRQ and reset control. Compatibility is verified with STM32L0/L1/L4/F0/F3/F4/F7 series Nucleo boards using STM32CubeMX-generated initialization code and the X-CUBE-BLE1 middleware stack.

Does the X-NUCLEO-IDB05A2 require external RF tuning components?

No. The BlueNRG-M0A module integrates a matched chip antenna and internal RF front-end, eliminating the need for external baluns, matching networks, or antenna tuning. The board meets FCC/IC radiated emission limits out-of-the-box without user-level RF calibration or component modification.

Can the X-NUCLEO-IDB05A2 operate as both BLE central and peripheral simultaneously?

Yes. The embedded BlueNRG-MS stack supports concurrent master and slave roles. This allows the board to act as a BLE sensor node (peripheral) while also scanning and connecting to other peripherals (central), enabling hub-and-spoke topologies in mesh-adjacent deployments without host MCU intervention.

How is SPI configuration modified on the X-NUCLEO-IDB05A2?

SPI signal routing is changed by replacing surface-mount resistors: R70 (SPI_CLK), R80 (SPI_CS), and R10 (SPI_IRQ). Default connections use PB6, PA9, and PA1 respectively; alternative mappings are documented in the DB4170 schematic (pages 4–5) and require physical resistor replacement-not software reassignment.