A secure and stable Wi-Fi connection to Azure IoT cloud

Inventek announces Microsoft Azure cloud support with STM32L4 Discovery IoT kit using the Inventek ISM43362-M3G-L44 802.11 b/g/n compliant Wi-Fi® module. This eS-WiFi module utilizes Inventek firmware, IWIN C3.5.2.x_SPI_STM. The IoT Discovery kit has been qualified for connection to Azure cloud.

Azure IoT Wi-Fi Connectivity

Inventek and ST Microelectronic s has developed this project to allow OEM’s to quickly integrate Wi-Fi over a SPI host interface running the MQTT protocol. The STM32L4 Discovery Board for IoT with the ISM43362-M3G Wi-Fi module can be purchased from Digi-key , P/N B-L475E-IOT01A. The Cube project for Azure, is an STM32Cube function pack that was developed for this kit and it can be downloaded here, FP-CLD-AZURE1.

With this IoT evaluation board, you can connect to Azure IoT Hub the cloud platform, monitor, and manage billions of IoT assets using one of the Microsoft Azure.
The STM32 IoT Discovery Kit Node is an Arm® Cortex®-M4-core-based developer kit and supports a full set of low power wireless connectivity options and environmental, motion and ranging sensors.

Azure IoT C SDK is integrated into the middleware of this function pack, which enables direct and secure connectivity to Azure IoT Hub, as well as full support for Azure device management. Furthermore, the platform specific adaptors which plug into the C SDK are available in source code. Developers can leverage this port across different MCU families using the hardware abstraction layer and STM32Cube.

The STM32L4 Discovery kit for the IoT node (B-L475E-IOT01A) allows users to develop applications with direct connection to cloud servers. The STM32L4 Discovery kit enables a wide diversity of applications by exploiting low-power multilink communication (BLE, Sub- GHz), multiway sensing (detection, environmental awareness) and ARM® Cortex®-M4 core-based STM32L4 Series features. Arduino™ Uno V3 and PMOD connectivity provide unlimited expansion capabilities with a large choice of specialized add-on boards.

Wi-Fi 2.4/ 5GHz, Bluetooth, BLE & Near Field Comm SiP Module

The ISM43341-L77 quad-radio device provides the highest level of integration for wireless system, with integrated dual band (2.4 GHz/ 5 GHz) IEEE 802.11 a/b/g/n single-stream, MAC/baseband/radio, Bluetooth 4.0. It also integrates a low power NFC controller.

Product Specifications:

The ISM43341 includes integrated power amplifiers, LNAs and T/R switches for the 2.4 GHz and 5 GHz WLAN bands, greatly reducing the external part count, PCB footprint, and cost of the solution.

This product is intended for embedded Linux/ Android applications running on qualified Host processors with a SDIO interface. This product is targeted at high volume designs with experienced Linux/Android customers.  A Software License Agreement is required for Driver support.

Product Overview

  • Wi-Fi standards, speeds and security:
    • 802.11 a/b/g/n with speeds up to 72Mbps
    • WEP(64/128-bit), WPA, WPA2 (Personal), 802.11i(AES, TKIP, 802.1x)
  • System-in-Package design, no need for external crystal oscillators or RF switches
  • Single supply voltage of 3.3VDC ±5%
  • 77 pin LGA package (13.3mm x 14.5 mm, 2 mm)
  • WLAN, Bluetooth functions:
    • Shared Single and dual-antenna support
    • WLAN host interface :4-bit SDIO for easy host interfacing
    • BT host digital interface (can be used concurrently with above interface): UART (up to 4 Mbps)
    • ECI – enhanced coexistence support, ability to coordinate BT SCO transmissions around WLAN receives
    • I²S/PCM for BT audio
    • HCI high-speed UART (H4, H4 +, H5) transport support
    • Bluetooth SmartAudio® technology improves voice and music quality to headsets
    • Bluetooth low power inquiry and page scan
    • Bluetooth Low Energy (BLE) support
    • Bluetooth Packet Loss Concealment (PLC)
    • Bluetooth Wide Band Speech (WBS)

    The ISM43341 supports the following NFC features:

    • Individual byte framing
    • Reader/Writer (R/W) modeActive and Passive Peer-to-Peer (P2P) mode
    • Tag/Card Emulation mode:
    • Support for battery-enabled card emulation mode
    • Support for two levels of “residual” battery-assisted card emulation mode

    Radio Only SIP Summary

    340 431 SIP driver details

    Evaluation Boards

    Rocky Mini ISM43341-L77 EVB
    ISM43340-L77 EVB


    • Internet Enabled Consumer Devices
    • M2M (Machine-to-Machine)
    • Industrial Handheld Devices
    • Asset/Inventory Management
    • POS Terminals
    • Medical Equipment
    •  Wi-Fi Enabled Security Cameras

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