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Reference design for Bluetooth headsets

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article image Provides up to 10 hours of talk time.

XEMICS, represented in Australia by Electronic Development Sales , has released the AudioBlue2 reference design. It is based on the XE1431 Bluetooth MCU and the CX72303 radio and aimed at the mobile phone headset market.

It is designed for a Li-ion or Ni-MH rechargeable battery and provides up to 10 hours of talk time. It includes both hands-free and headset profiles and supports features to answer, terminate, pick up, reject or place a call. It also allows volume control, activating the phone's voice recognition, redialling the last number, putting calls on hold or toggle, and connecting two calls. The distance between the handset and headset can be up to 10m. It comes in a 38mm x 18mm PCB . It has multipurpose push-buttons and LED indicators.

The embedded Bluetooth controller in the XE1431 independently executes significant parts of the Bluetooth protocol stack and allows the development of application layer software without the need to validate the Bluetooth protocol stack integrity. Serial Flash memory is used to store application layer software.

Due to the on-chip audio CODEC and power management unit, it is suitable for headset/audio applications where continuous software updates of the higher layers are vital to keep up to date with Bluetooth implementation in various mobile phones.

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