BTM511 - Bluetooth V2.1+EDR Audio Modules

Laird BTM 511 are low-power Bluetooth® modules designed for adding robust audio and voice capabilities.

Laird BTM 511 modules are low-power Bluetooth® modules designed for adding robust audio and voice capabilities. Based on the market-leading Cambridge Silicon Radio BC05 chipset, these modules provide exceptionally low power consumption with outstanding range. Supporting the latest Bluetooth Version 2.1+EDR specification, these modules provide the important advantage of secure simple pairing that improves security and enhances easy use.

The compact size of the BTM511 makes it ideal for battery-powered or headset form factor audio and voice devices. With a 16-bit stereo codec and microphone inputs to support both stereo and mono applications, these modules also contain a full, integrated Bluetooth-qualified stack along with SPP, HFP 1.5, HSP, AVRCP, and A2DP profiles. (Customers using these modules may list and promote their products free of charge on the Bluetooth website.)

The BTM511 modules include an embedded 32-bit, 64-MIPS DSP core within the BC05. Integrated Bluetooth functionality allows designers to add significant product enhancements including features such as echo cancellation, noise reduction, and audio enhancement using additional soft codecs. The availability of the 16MB of flash memory in the module allows complex functionality to be included. DSP routines can be licensed through a number of specialist partners.

To speed product development and integration, Laird has developed a comprehensive AT command interface that simplifies application development, including support for audio and headset functionality. Access to GPIO pins allows mapping for direct connection to actuator buttons on headsets. Combined with a low-cost development kit, Laird Technologies' Bluetooth modules provide faster time to market.


  • Fully featured Bluetooth multimedia chipset
  • Bluetooth v2.1+EDR
  • Supports mono and stereo headset applications
  • apt-X Audio Codec provided free of charge
  • Adaptive frequency hopping to cope with interference from other wireless devices
  • 32-bit Kalimba DSP for enhancedaudio applications
  • Support for secure simple pairing
  • On-board antenna option option only
  • HSP, HFP, A2DP, and AVRCP audio profiles
  • 16-bit stereo codec and microphone input
  • AptX, AAC and SBC codecs supported
  • CVC audio enhancement supported
  • EIR fully supported
  • Integrated audio amplifiers for driving stereo speaker
  • Comprehensive AT interface for simple programming
  • Bluetooth End Product qualified
  • Compact size
  • Class 2 output - 4 dBm
  • Low power operation
  • WLAN co-existence hardware support

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

* BTM510 is End-of_life. Last date for orders was 19 February 2016. There is no recommended alternative.

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

Class 2

+4 dBm (from integrated antenna - BTM511)

Rx Sensitivity Better than -86 dBm
Range Up to 30m
Data Rates Up to 3.0 Mbps (over the air)
UART Data Transfer Rate Greater than 300 Kbps
Host Interface
UART Supports DTR, DSR, DCD and RI, multiplexed with other functionality
Audio Interfaces

Internal 16 bit Stereo Codec

Integrated Amplifiers for driving Stereo Speaker


Master/Slave roles


Stereo microphone input

Integrated Kalimba DSP 32-bit, 64 MIPS
Additional I/O
4 x GPIO Function Mapping e.g. button control

SPP - Serial Port Profile


HFP - Audio Gateway and Handset

A2DP - Source and Sink

AVRCP - Target and Controller

Supply Voltage
Supply 3.0V to 3.3V
I/O 1.7V to 3.6V
Power Consumption
Current Consumption

Less than 70mA (including speaker amplifiers)

Idle (sleep) < 1 mA

Coexistence /Compatibility

802.11 (WLAN) 2 wire and 3 wire schemes supported
Internal Antenna Multilayer ceramic - BTM411
Programming API
AT Command Set (extended for audio and headset functions)

14.0 mm x 25.0mm x 3.4 mm (integrated antenna - BTM511)

Operating Temperature -30°C to +70°C
Storage Temperature -40°C to +85°C
Bluetooth End Product Approved

BTM511 - Full Modular Approval


Lead-free and RoHS compliant

  • High-quality stereo headsets
  • Mono voice headsets
  • Hands-free devices
  • Wireless audio cable replacement
  • MP3 and music players
  • Phone accessories
  • VoIP products
  • Cordless headsets
  • Aftermarket automotive applications
Partl No.
Pack Sizes

Bluetooth Multimedia Module (external antenna)

* BTM510 is End-of-Life. Last date for orders was 19 February 2016. There is no recommended alternative.


BTM511 Bluetooth Multimedia Module (with integrated antenna)
Tray of 50

Development board with BTM510 module soldered on

* BTM510 is End-of-Life. Last date for orders was 19 February 2016. There is no recommended alternative.

DVK-BTM511 Development board with BTM511 module soldered on Each

Laird provide development boards to enable engineers to evaluate and test BTM511 modules before commencing PCB design and layout.

DVK-BTM511: Development board with BTM511 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