BTM441 / BTM443 - Bluetooth V2.1+EDR Enhanced Data Modules

Supporting V2.1+EDR, Laird BTM44x SMT Bluetooth enhanced data modules support additional profiles, including the Health Device Profile (HDP), making them ideal for Continua compliant medical and wellness devices.

BTM44x series Bluetooth® modules from Laird have been designed to meet the needs of developers who wish to add robust, short-range Bluetooth data connectivity to their products. They are based on the market-leading Cambridge Silicon Radio BC04 chipset, providing exceptionally low power consumption with outstanding range. These modules support the latest Bluetooth Version 2.1 Specification, providing the important advantage of Secure Simple Pairing, which improves security and enhances the ease of use for end customers. In addition to Serial Port Profile, the BTM44x series features a number of additional features and profiles not found on other Bluetooth modules.

With a small footprint of 12.5 x 18.0 mm and best-of-class, low-power operation, these modules are the ideal choice for applications where designers need both performance and minimum size. For maximum flexibility in systems integration, the modules are designed to support a separate power supply for I/O.

To aid product development and integration, Laird has integrated a complete Bluetooth protocol stack within the modules, including support for multi-point connections and numerous Bluetooth profiles, and are fully qualified as Bluetooth End Products, allowing designers to integrate them within their own products with no further Bluetooth Qualification.

Support for Serial Port Profile (SPP), Human Interface Device (HID) profile and Health Device Profile (HDP) are included in the module. The support of the Bluetooth Sig's Health Device Profile makes this the ideal module for development of Continua compliant medical and wellness devices. By default the Health Device Profile supports the ISO/IEEE 11073-10415 device specialization for weigh scales, but additional specializations can be made available upon request.

Communication is available to the module over a serial UART utilizing either a custom Multi-point Packet Protocol API or comprehensive AT commands. Combined with a low cost developer's kit, this ensures that the choice of Laird Bluetooth modules guarantees the fastest route to market.


  • Bluetooth v2.1+EDR
  • Adaptive frequency hopping to cope with interference from other wireless devices
  • Secure Simple Pairing support
  • External or internal antenna options
  • Comprehensive AT interface for simple programming
  • Bluetooth End Product Qualified
  • Compact size
  • Class 2 output - 4 dBm
  • Low power operation
  • UART interface
  • GPIO lines under AT control

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

* BTM443 recommended for new designs

Feature Specification
Bluetooth Version 2.1+EDR
Frequency 2.402 - 2.480GHz
Max Tx Power

Class 2

+4 dBm (from integrated antenna - BTM441/BTM443)

Rx Sensitivity Better than -84dBm
Range Up to 30m
Data Rates Up to 2.1 Mbps (over the air)
UART Data Transfer Rate Greater than 300 Kbps
Host Interface
UART Supports CTS, RTS, DTR, DSR, DCD and RI
User Interface
GPIO 8 lines (shared)

SPP - Serial Port Profile

HID - Human Interface Device Profile

HDP - Health Device Profile

Multipoint Support Up to seven slave devices supported (throughput is limited in multipoint mode)
Supply Voltage
Supply 3.0V to 3.3V
I/O 1.7V to 3.6V (independent of Vcc)
Power Consumption
Current Consumption

Less than 40 mA during SCO transmission

Idle (sleep) < 1 mA

Internal Antenna Multilayer ceramic - BTM441/BTM443

AT Command Set


Multipoint Packet Protocol - up to 3 connections (throughput is limited in multipoint mode)


12.5 mm x 18.0 mm x 3.4 mm (external antenna - BTM440/BTM442)

12.5 mm x 22.0mm x 3.4 mm (integrated antenna - BTM441/BTM443)

Operating Temperature -40°C to +85°C
Storage Temperature -40°C to +85°C
Bluetooth End Product Approved

BTM441/BTM443 - Full Modular Approval


Lead-free and RoHS compliant

  • Embedded devices
  • Phone accessories
  • Security devices
  • Medical and telehealth devices
  • Aftermarket automotive applications
  • Bluetooth advertising
  • ePOS
Partl No.
Pack Sizes

Enhanced Bluetooth Data Module (Multipoint Mode with integrated antenna)

* BTM443 recommended for new designs

Tray of 50
BTM443 Enhanced Bluetooth Data Module (AT Command Mode with integrated antenna)
Tray of 50
DVK-BTM443 Development board with BTM443 module soldered in place Each

Laird provide development boards to enable engineers to evaluate and test BTM44x modules before commencing PCB design and layout.

DVK-BTM441: Development board with BTM431 module soldered in place

DVK-BTM443: Development board with BTM443 module soldered in place

Kit contents:

  • Development board with Bluetooth module soldered in place
  • Bluetooth USB adapter
  • USB cable for power and communications

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Last updated: 1 September 2016