BTM520

Bluetooth® Multimedia Plus Module

Features
Fully featured Bluetooth multimedia module
Supports CSR Road Tunes and Blue Tunes applications
Bluetooth v2.1+EDR
Supports mono and stereo headset applications
Adaptive Frequency Hopping
32bit Kalimba DSP for Enhanced Audio
Support for Secure Simple Pairing
External or internal antenna options
HSP, HFP, A2DP and AVRCP audio profiles
OBEX, DUN, FTP profiles for additional functionality
16 bit stereo codec and microphone input
Integrated audio amplifiers for driving 16Ω speakers
Comprehensive AT interface for simple programming
Bluetooth END Product Qualified
Compact Size
Class 1 output – 10dBm
Comprehensive I/O capability
Low power operation
Wi-Fi Coexistence Hardware Support

The BTM520 and BTM 521 are the most advanced low power, multimedia Bluetooth modules on the market. They have been designed by Laird Technologies to meet the needs of developers who require the ultimate Bluetooth audio performance and flexibility, along with fast time to market.  The modules include everything needed for a fully qualified and functional Bluetooth multimedia application.  As well as providing best in class radio performance, range and power consumption, they support all of the functionality to run Cambridge Silicon Radio’s Road Tunes and Blue Tunes development environments.  They support the latest Bluetooth Version 2.1+EDR Specification, providing the important advantage of Secure Simple Pairing, which improves security and enhances the ease of use for end customers.  The BTM521, with an integrated high performance multilayer ceramic antenna can achieve open field ranges in excess of 300 metres.

The modules include a 16 bit stereo codec and microphone input to support both stereo and mono applications, with the ability to drive 16Ω stereo speakers.  They also contain all of the necessary audio filtration and biasing components, so that the module only requires the addition of speakers, microphone and push buttons to make a complete implementation.

They contain a full, integrated Bluetooth stack along with SPP, HFP 1.5, HSP, AVRCP and A2DP profiles, all of which have been qualified, so that no further Bluetooth qualification is required.  For users with more complex applications, additional profiles are available for file transfer, object exchange, dial up networking, messaging and phone book control.  Future support includes the Health Device Profile, making this the ideal module for development of Continua compliant medical devices.  Because these modules are pre-qualified, customers using these modules can list and promote their products on the Bluetooth website free of charge.

The BTM520 and BTM 521 modules include an embedded 32 bit, 64 MIPS DSP core within the BC05, which is integrated with the Bluetooth functionality and which allows designers to add significant product enhancements.  These include features such as echo cancellation, noise reduction and audio enhancement using additional soft codecs.  16MB of flash memory is available within the module, so that complex functionality can be included.  DSP routines are licensable through from a number of specialist partners.  Typical applications for these modules include Bluetooth headsets, Bluetooth stereo headsets, VoIP phones, automotive products, wireless audio links and medical / healthcare devices.

To speed product development and integration, Laird Technologies has developed a comprehensive AT command interface, which simplifies application development and includes support for audio and headset functionality.  It provides access to GPIO pins, allowing these to be mapped for direct connection to actuator buttons on headsets.  Combined with a low cost developer’s kit, this ensures that the choice of Laird Technologies Bluetooth modules guarantees the fastest route to market.