User Guide

Bluetooth

Bluetooth is an open specification for wireless communication of data and voice. It is based on a low-cost

short-range radio link between two or more devices. The traditional example is a link between a mobile

phone and a laptop computer or a headset.

Bluetooth provides a fully digital link for communication between a master unit and one or more slave units.

The system provides a radio link that offers a high degree of flexibility to support various applications and

product scenarios. Data and control interface for a low power RF module is provided. The data rate is

regulated between the master and the slave.

The device Bluetooth is based on the BC4 BT ASIC (BTHFM1.0).

The UART1 interface handles the transfer of control and data information between the application processor

and the Bluetooth system. The PCM interface is used for audio data transfer between the RAP ASIC and the

Bluetooth system.

FM radio

The second part of the BTHFM module contains the FM radio.

The antenna for the FM radio is provided by plugging in an external wired headset to the system connector.

It is not possible to listen to the FM radio without a wired headset connected. The FM radio is controlled by

I2C commands coming from RAP. The audio output of the FM radio is fed to the headset via the EM ASIC N2200,

so the rest of the phone can sleep while the FM radio is active.

USB

USB (Universal Serial Bus) provides a wired connectivity between a USB host PC and peripheral devices.

USB is a differential serial bus for USB devices. USB controller supports USB specification revision 2.0 with full

speed USB (12 Mbps). The device is connected to the USB host through the system connector. The USB bus is

hot plugged capable, which means that USB devices may be plugged in/out at any time.

WLAN interface

A Wireless Local Area Network (WLAN) is a flexible data communication system in which a mobile user can

connect to a local area network through a wireless connection. The standard, which specifies the technologies

for WLAN, is called IEEE 802.11. The device supports both IEEE 802.11.b and 802.11.g standards, so the support

data rates are from 1 Mbps to 54 Mbps in 2.4 GHz ISM band.

The WLAN module also requires the reference clock of 38.4 MHz.

The WLAN module uses the same VIO as the application processor.

The same antenna is shared with BT and WLAN. When BT_CLK_REQ is activated and WLANENABLE is disabled,

the antenna can be used by BT.

RA-6

System Module

Issue 1 COMPANY CONFIDENTIAL Page 6 –11