User Guide

Figure 68 Clocking scheme

Bluetooth

The device Bluetooth is based on BRF6150-ROM ASIC which is a low power Bluetooth RF-tranceiver module

and has the BTH/WLAN physical coexistence interface. BRF6150-ROM is a single chip Bluetooth device

appropriate for use in applications, where the BB acts as a Bluetooth host interface. The host device (phone)

provides powering for the integrated Bluetooth and WLAN system and a separate clock request is used for

BTH and WLAN by an external TCXO reference clock 38.4 MHz.

Bluetooth device provides a fully digital link for communication between a master unit and one or max seven

slave units. Data rate is regulated between the master and the slave.

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

the BT system.

The PCM interface is used for audio data transfer between RAP and the BT system (BC4).

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

STLC4370A implements 802.11b/g WLAN radio for embedded, low-power and small form factor mobile

applications.

STLC4370A has a fully integrated radio chip including a direct-conversion transceiver, RF synthesizer and VCO,

and high-speed data converters.

The baseband chip implements OFDM/CCK digital baseband processor and ARM9- based MAC with internal

SRAM memories.

The energy management unit integrates required power management functions to operate the system from

VBAT (3.0 – 5.5 V). The EM unit generates 1.2 V digital core voltage, two 1.8 V supplies for RF and 2.8 V LDO

for PA bias supply.

Low-power sleep mode operation is enabled by low-speed 32 kHz clock (32768 Hz) and energy management

unit low-current stand-by mode.

RM-49

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