STMicroelectronics B-L475E-IOT01A2

Overview

B-L475E-IOT01A2 from STMicroelectronics is a Discovery kit for IoT node featuring an STM32L475VG microcontroller (Arm® Cortex®-M4, 1 MB Flash, 128 KB SRAM, LQFP100), integrated 868 MHz Sub-GHz RF module (SPSGRF-868), Bluetooth® 4.1 (SPBTLE-RF), Wi-Fi® 802.11 b/g/n (ISM43362-M3G-L44), and multi-sensor suite including VL53L0X ToF, HTS221 humidity/temperature, LIS3MDL magnetometer, LSM6DSL 6DoF IMU, LPS22HB barometer, and M24SR NFC tag - designed for cloud-connected edge sensing and protocol evaluation.

For engineers reviewing the B-L475E-IOT01A2 datasheet, B-L475E-IOT01A2 pinout, B-L475E-IOT01A2 application, or B-L475E-IOT01A2 equivalent, this kit serves as a validated hardware reference for rapid prototyping of multi-radio (BLE/Sub-GHz/Wi-Fi) IoT endpoints with synchronized environmental, motion, and proximity sensing under ultra-low-power constraints.

Technical Context

The kit implements a heterogeneous sensor fusion platform where the STM32L475VG MCU acts as central host and real-time coordinator across five concurrent communication interfaces: USB OTG FS (debug/host), SPI-based Quad-SPI Flash (64 Mbit), UART-controlled BLE and Sub-GHz radios, SDIO-linked Wi-Fi, and I²C-connected sensors (HTS221, LIS3MDL, LSM6DSL, LPS22HB, VL53L0X, M24SR). All peripherals are pre-integrated with HAL drivers in STM32CubeMX and X-Cube-Cloud middleware.

Power architecture supports dual sourcing (ST-LINK VBUS or external 5 V/3.3 V), with configurable low-power modes (Stop2, Shutdown) enabling sub-μA sleep current; the VL53L0X laser subsystem complies with IEC 60825-1:2014 Class 1 safety limits when operated per ST's recommended settings and thermal/voltage specifications.

Key Specifications

Availability

B-L475E-IOT01A2 is available at Aetrix Electronics and suitable for industrial condition monitoring, smart building occupancy sensing, predictive maintenance gateways, and academic IoT curriculum requiring stable component supply and vendor-supported firmware toolchains.

Supply support for B-L475E-IOT01A2 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, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer applications.

The B-L475E-IOT01A2 belongs to ST's Discovery kit product line - engineered to accelerate evaluation and prototyping of STM32-based IoT solutions with pre-validated hardware, certified wireless modules, and cloud-ready software stacks.

FAQ

What distinguishes B-L475E-IOT01A2 from B-L475E-IOT01A1?

The sole hardware difference is the Sub-GHz radio frequency band: B-L475E-IOT01A2 integrates the SPSGRF-868 module for 868 MHz operation (ETSI-compliant in Europe), while B-L475E-IOT01A1 uses SPSGRF-915 for 915 MHz (FCC-compliant in North America). All other components, firmware, and mechanical design are identical.

Does the kit support Arm® Mbed™ out of the box?

Yes - the B-L475E-IOT01A2 is Arm® Mbed Enabled™ certified. It ships with preloaded demonstration firmware and supports direct import into the Mbed Online Compiler via drag-and-drop USB mass storage mode, with full peripheral drivers and cloud connector libraries included in Mbed OS 5.x and later.

Can the VL53L0X sensor be used for gesture detection without additional hardware?

Yes - the VL53L0X on B-L475E-IOT01A2 is configured for short-range time-of-flight measurement (2.5–200 mm) and supports basic gesture recognition (e.g., swipe, hover) using ST's X-CUBE-TOF1 middleware and example firmware, requiring no external optics or calibration hardware beyond the onboard printed antenna and lens.

Is the Wi-Fi® module field-upgradable?

Yes - the ISM43362-M3G-L44 Wi-Fi® module includes an internal flash memory that supports over-the-air (OTA) firmware updates via the STM32L475VG host MCU using the Inventek Systems AT command set and X-Cube-WIFI1 middleware, enabling security patching and protocol enhancements post-deployment.