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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.
Figure 28 Bluetooth interface
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.
RM-257; RM-270; RM-277
System Module
Issue 1
COMPANY CONFIDENTIAL
Page 5 –17
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