ISM43340-M4G-L44 Serial-to-Wi-Fi Dual Band (2.4 & 5 GHz) & BLE Combo Module

ISM43340 /1

The ISM43340-M4G-L44 is an embedded 2.4 & 5 GHz Wi-Fi 802.11 a/b/g/n, Bluetooth Low Energy (BLE) and Bluetooth 4.0 module. The module hardware consist of a Cypress CYW43340 Combo radio, antenna and a STM32F405 host processor with 1MB of flash and supports SPI or UART host interfaces.

The Wi-Fi module requires no operating system and has an integrated TCP/IP stack that only requires a simple AT command set to establish connectivity for your wireless product. The module has a small 14.70mm x 34.22mm surface mount footprint and has full FCC, IC and CE module certification.

This product is targeted for low cost embedded wireless applications and enables a quick, easy and cost effective method adding WiFi, Bluetooth, and BLE connectivity to your platforms.

Key module features:

  • 802.11 b/g/n Broadcom BCM43340 Radio device
  • Bluetooth 4.0 with support for Wi-Fi /BLE  co-existence
  • Fully contained TCP/IP stack thus minimizing host CPU requirements
  • Configurable with Inventek IWIN AT commands
  • Host interface: UART, SPI up to 25+ MHz
  • Network features ICMP ( Ping), ARP, DHCP,TCP, UDP
  • BLE, Bluetooth 4.1
  • Over the Air updates (OTA)
  • Secure WiFi authentication WEP-128, WPA-PSK (TKIP), WPA2-PSK 

Product Documentation

IWIN AT Command Resources

This module can be run using the Inventek IWIN AT commands or the Cypress WICED SDK.  The Inventek AT command set requires an external host connected via SPI or UART .
IWIN- AT Command Documentation
IWIN- AT Command Support Site
IWIN – AT Command Set User Manual
IWIN – AT Command Quick Reference Guide


IWIN AT Command Firmware Binary Files
IWIN AT Command Firmware Upgrade Options
IWN AT Commands Over the Air Updates
JTAG Firmware Update Note
Cypress WICED SDK Patch
The Cypress WICED SDK requires a patch to be installed to use the Inventek modules.

Software Scripts Examples

IWIN AT Command Support Site
TCP/UDP DEmo Script (Python)
TCP Server Multi Accept Demo (Python)
HTTPs TCP File Download for OTA
Raspberry Pi SPI Clent (C)
Amazon AWS MQTT Demo
HTTP Get Request (Teraterm  Macro )
Android Application TCP Client & Server
AT Command Set Quick Start Guide
IWIN (AT Command Set:  PC Demo software)
TCP Client Demo (Python)

IOT MCU Software Reference Designs

The projects below can be run on any of the Inventek eS-WiFi modules with minor modifications.

Cypress PSOC4 : Project with ISMART shield plugged on top of the PSOC 4 EVB
Inventek Shield: Project with ISMART shield connecting to iMatrix IoT Cloud
AWS STM32L4 Discovery IoT : Project connecting to Amazon AWS IoT Core
Azure STM32L4 Discovery IoT EVB: Project connecting to Microsoft AZURE IoT
Google STM32L4 Discovery IoT EVB: Project connecting to Google IoT Cloud
IBM STM32L4 Discovery IoT EVB: Project connecting to IBM Watson
AWS Free RTOS STM32L4 Discovery EVB: Project connecting to Amazon RTOS
ST Micro Nucleo : Project communicating to the Inventek Shield over UART
Analog Device ADICUP360 : Project connecting Toxic gas to PTC cloud

Evaluation Board
Evaluation Board. The EVB supports all eS-WiFi modules in the L44 and L44+10 (Land Grid Array) footprint – ISM43362, ISM4390, ISM43340, ISM43341, ISM4343 and ISM907.
Evaluation Board Reference Schematic

ISMART (Inventek Systems Module Arduino Test) IoT platform ISMART43340-C Arduino Shield
ISM43340C Shield part

EMC Grants

NFC 15-0107.9D.Inventek.ISM4334x-M4G-L44.15.225 Rpt
BT-NFC 15-0107.Inventek.ISM4334x-M4G-444.NFC 2441CUC15_GRANT
ISM43341(802.11an).EN 302 502 V2.1.1 RED Update Rpt
BT 15 ISM4334x-M4G-L44.EN 300-328 for BT1
NFC ISM4334x-M4G-L44.EN 300-330 v1.8.1
Russia FCC Document

Buy Online from Our Valued Distributors

Buy ISM43340-M4G-L44-10CF from Digi-Key
Buy ISM43340-M4G-L44-10U from  Mouser

Evaluation Boards

Buy ISMART43340 Eval  Boards from Digi-Key
Buy ISMART43340  Eval Board from  Mouser

Contact Inventek

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Contact Inventek