Bluetooth; Gps Interface (Rm-257 Only) - Nokia 3555 Service Manual

RM-257; RM-270; RM-277
System Module

Bluetooth

Bluetooth provides a fully digital link for communication between a master unit (the phone) and one or more
slave units (e.g. a wireless headset). Data and control interface for a low power RF module is provided by the
module.
The Bluetooth has a separate built in antenna and is powered by VBAT and the regulated voltage VIO. For
audio applications the Bluetooth has a PCM data bus. In addition a UART (universal asynchronous receiver/
transmitter) is used for data communication and controls.

GPS interface (RM-257 only)

The device includes an inbuilt GPS receiver and it works as a stand-alone positioning device. The antenna is
located below the main keypad in the bottom of the product.
The GPS system is connected to RAP ASIC.
Issue 1
Figure 28 Bluetooth interface
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
Page 5 –17