Interfaces; Bluetooth; Wlan; Hs-Usb - Nokia RX-44 Service Manual

RX-44
System Module

Interfaces

Bluetooth

Bluetooth data interface is connected to UART1 of application processor D4800. UART is an asynchronous
interface for transferring data and control information to BT device.

WLAN

WLAN host interface is 4-line synchronous serial interface.

HS-USB

Universal Serial Bus is a galvanic interconnection between product and an external device. RX-44 is High
Speed USB 2.0 OTG device, through the Micro-AB connector.
OTG (On-To-Go) support means that RX-44 can work as host (like PC) in USB connection to another USB slave
device. Supported (e.g. another RX-44) slave devices are shown as mass storage device connection in RX-44
file manager.

Memorycards

The device hasone memory card reader, which support dual voltage cards. In addition, there is an internal
memory card assembled on PWB.
Internal 2GB eMMC flash memory is intended for user content storage. It can be used to store pictures, music,
map files etc. This memory is shown in file manager as internal memory card and is not removable by the
user.
The external memory card is supplied with dual 1.8/3 V supply voltage, depending on the card type.
The detection of external memory card removal/insertion is done by a switch in the lid. Internal memory
card is assembled on PWB and is not removable by the user.
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