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RF/Microwave??

CSR joins Bluetooth, Wi-Fi, FM bandwagon

Posted: 12 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:CSR plc? Bluetooth? Wi-Fi? FM radio? chip?

Bluetooth solutions provider CSR plc has joined the growing list of companies over the past few days announcing their roadmaps for integrating Wi-Fi and Bluetooth capabilities in chips targeting mobile phones, with some of these including FM radio functionality.

The company suggests its device, which integrates the first version of its UniFi WLAN technologywith the second iteration to follow by the middle of the yearand a choice of Bluetooth cores, has significant power consumption advantages over devices from Broadcom Corp., Texas Instruments Inc. , Marvell or NXP Semiconductors.

Dubbed the UniVox Mobile, the reference design, which uses the CSR's tried and tested software stacks, ensures coexistence between both 2.4GHz radios, the company claims.

According to Simon Finch, head of CSR's Wi-Fi business unit, "because we use the same building blocks that we already have, the unified chip can be configured to cope with a multitude of coexistence scenarios." He added that Wi-Fi throughput remains high even when Bluetooth is used concurrently, by using Collision Detection Logic.

Finch told EE Times Europe that the highest data rates that can be achieved reached 23Mbps when Bluetooth is deactivated, reducing to 18Mbps with Bluetooth switched on.

He quotes typical cellular power at 5mW for idlethat is listening to both Wi-Fi beacons and GSM pagingand 288mW for a VoIP call, with the corresponding Wi-Fi chip, including PA and power management, drawing 7mW and 68 mW.

"Taken together, that translates to 250 hours in standby mode and 8 hours VoIP talk time in a phone. We have done analysis that shows phones using other devices are significantly more power hungry in both modes. This is a real winner for us; the others are not there in terms of power."

The Bluetooth part can be either BlueCore4-ROM or BlueCore5-FM and the hardware architecture is platform independent so can be used via standard interfaces with most cellular baseband processors and chipsets. The SDIO/SPI interface is used for Wi-Fi and UART/12S for Bluetooth.

- John Walko
EE Times Europe




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