Bluetooth silicon

Cambridge Silicon Radio has launched its third generation of Bluetooth silicon, claiming that its BlueCore3 product line is the first complete implementation of the Bluetooth v1.2 standard.

Cambridge Silicon Radio has launched its third generation of Bluetooth silicon, claiming that its BlueCore3 product line is the first complete implementation of the Bluetooth v1.2 standard (including all optional features of the standard) which improves coexistence of Bluetooth with other 2.4GHz systems.

In earlier incarnations of BlueCore, CSR employed a variety of measures to prevent radio interference. Over the last two years, CSR has been involved in the development of AFH (Adaptive Frequency Hopping), a feature integrated into Bluetooth v1.2 which coordinates the frequency channels that both Bluetooth and other 2.4GHz radio devices use so that they don’t interfere with each other. For this reason, CSR’s BlueCore3 is even more suitable for a number of combo designs where WiFi and Bluetooth are required to work together in one product.

BlueCore3 also implements v1.2’s eSCO facility to provide the basis for advanced cordless telephony applications for Bluetooth. SCO is the Synchronous and Connection Oriented physical link which transports voice across a Bluetooth link. Extended SCO (or eSCO) channels are error checking voice channels which allow polled retransmissions. Raw data can be sent over SCO, and data rates may also be negotiated, thus improving on the current data rates for high quality-of-service connections. With this function, detection and re-transmission of lost or destroyed voice packets is possible with a minimum impact on real-time performance – essential for high quality voice transmission.

There are currently two products in the BlueCore3 line. BlueCore3-Multimedia offers a user-programmable DSP and is aimed at low cost, high-volume applications such as such as Bluetooth enabled wireless stereo headphones. The second product, BlueCore3-ROM is targeted at mobile handset applications.