A Bluetooth® low energy only module that runs it’s own host stack under the Bluetooth® v4.1 standard.
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Bluetooth® low energy Module v4.1 with IC Antenna – LM931

Bluetooth® low energy Module v4.1 with IC Antenna – LM931 can be used within a wide range of embedded systems including Beacons, key fobs and sensors. While saving the developer critical physical space. The LM931 enables you to wirelessly communicate with other nearby Bluetooth® low energy devices (e.g. iPhones and Android devices). Using a highly power efficient Bluetooth® low energy connection.

This standalone module allows the developer to connect peripheral devices and runs the Bluetooth® low energy user application, without using an external MCU. LM offer Bluetooth® low energy application support to the developer and can create new user applications for the module. We also offer Bluetooth® low energy demo applications, which can be customised to your specification.

Your developed user application and settings can be preloaded to the LM931, simplifying the manufacturing and testing process. Its SMT side and bottom pads allows for easy integrations into your embedded system.


Bluetooth® low energy Module v4.1 with IC Antenna – LM931 – Bluetooth® low energy applications

The LM931 is a standalone module capable of running your Bluetooth® low energy Application. Requiring no external MCU and supports a wide range of Bluetooth® low energy applications such as:

  • Alert Tag
  • Automotive Keyfob
  • Beacon
  • Blood Pressure Sensor
  • Cycling Speed and Cadence Sensor
  • Environment Sensor
  • Glucose Sensor
  • Health Thermometer
  • Heart Rate Sensor
  • Keyboard
  • Multifunction Steering Wheel
  • Mouse
  • Running Speed and Cadence Sensor
  • Security Tag
  • Serial Communication
  • Time Client
  • Temperature and Pressure
  • Weight Scale

LM Technologies offer Bluetooth® low energy application support, including assisting the developer and creating new applications. LM provide demo applications that can be customised to your specification. Demo Applications available:

  • URL Beacon
  • Key fob
  • RGB LED Controller
  • Serial Communication over GATT
  • GPIO (for testing module I/O capabilities)



  • 14 mA Current Consumption (at 0 dBm Tx Output Power)
  • Over-the Air Upgrade (OTAU) available
  • Application Firmware Support
  • GATT Server Applications Available (Serial over GATT, iBeacon and Key Fob with an RGB LED)
  • Fully integrated module with no additional components required


Wireless Standard BT 4.1
Module Type Programmmable (Configurable with CS Keys)
Profiles GATT-Based
Program Interface SPI
Interfaces I2C, UART
Antenna Onboard IC Antenna
Tx Output Power 9dBm (Maximum)
Rx Sensitivity -92dBm (Typical)
Dimensions 22mm x 10.11mm x 2.50mm
Operating Temperature -30°C to +85°C
Development Kit LM53X
Compliance ReachRoSHWEEE
Certifications Bluetooth SIG - UKCE-Europe-REDFCC - United StatesIC - Canada
More Information
Brand LM Technologies
Backorder Lead Time 2-4 Weeks ARO
Specification 4.1
Interface I2C
Class 1
Bluetooth stack location built-in
Profiles GATT
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