STMicroelectronics X-NUCLEO-IDB04A1

Overview

X-NUCLEO-IDB04A1 from STMicroelectronics is a Bluetooth Low Energy (BLE) expansion board based on the BlueNRG network coprocessor, designed to interface with STM32 Nucleo development platforms via SPI. It delivers +8 dBm max TX power, −88 dBm RX sensitivity, 7.3 mA RX / 8.2 mA TX current at 0 dBm, and integrates the BALF-NRG-01D3 balun for optimized RF matching. It supports BLE 4.0 master/slave operation and is FCC certified (FCC ID: S9NIDB04A1) and Japan Radio Law TYPE-certified for 5 mW.

For engineers reviewing the X-NUCLEO-IDB04A1 datasheet, X-NUCLEO-IDB04A1 pinout, X-NUCLEO-IDB04A1 application, or X-NUCLEO-IDB04A1 equivalent, this board enables rapid BLE prototyping on STM32 Nucleo platforms with Arduino UNO R3 compatibility, configurable SPI signals (CLK/CSN/IRQ), and pre-certified RF performance for global regulatory compliance.

Technical Context

The board implements a dedicated SPI interface (up to 2 Mbps) between the host STM32 MCU and the BlueNRG coprocessor, with hardware-selectable SPI signal routing via onboard resistors. It uses a meander PCB antenna tuned by the BALF-NRG-01D3 balun, which integrates impedance matching and harmonic filtering for 2.4 GHz ISM band operation.

Power management includes dual VBAT rails (VBAT1/VBAT2/VBAT3) supporting flexible supply configurations, and optional SMPS filtering (SMPSFILT1/SMPSFILT2 pins). The BlueNRG IC operates from 1.8 V (VDD1V8) and 1.2 V (VDD1V2) supplies, with external 32 MHz and 32.768 kHz crystal support for precise timing.

Key Specifications

Availability

X-NUCLEO-IDB04A1 is available at Aetrix Electronics and suitable for BLE sensor node development, STM32-based IoT gateway prototyping, and industrial wireless telemetry applications requiring stable component supply and pre-validated RF performance.

Supply support for X-NUCLEO-IDB04A1 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, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power devices for industrial, automotive, and consumer applications.

This board belongs to ST's X-NUCLEO ecosystem of expansion boards, engineered specifically to accelerate hardware evaluation and firmware development for STM32 Nucleo platforms using standardized Arduino UNO R3 and ST Morpho connectors.

FAQ

Does X-NUCLEO-IDB04A1 require external firmware to operate?

No. It ships with a free, comprehensive development firmware library and BLE examples compatible with STM32Cube, enabling immediate out-of-box operation when paired with an STM32 Nucleo board and STM32CubeMX/IDE. No separate BlueNRG SDK license is required.

Can the SPI interface pins be remapped to different STM32 GPIOs?

Yes. The default SPI clock, chip select, and interrupt pins are routed through zero-ohm resistors (R13, R16, R17) on the board. Removing and relocating these jumpers allows physical reassignment of those signals to alternate MCU pins without modifying the BlueNRG firmware stack.

Is an external antenna connector provided?

Yes. The board includes a U.FL connector (J2) that provides direct access to the RF output, allowing replacement of the onboard meander antenna with an external antenna for range extension or enclosure integration, while maintaining FCC and Japan Radio Law compliance boundaries.

What crystal frequencies does the BlueNRG IC support on this board?

The BlueNRG IC uses two crystals: a 32 MHz fundamental-mode HF crystal (Q1) for main RF clocking and a 32.768 kHz LF crystal (Q2) for real-time clock and low-power sleep timing. Both are populated and soldered on the board per the schematic.