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Nokia 616 Service Manual: Technical Information; Internal Signals And Connections; User Interface

Carkit phone (tfe-4/rv-1).
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Technical Information

TFE-4/RV-1, Nokia 610/616 are in-car GSM telephones which are permanently mounted
in the vehicle and can be used to make and receive calls like any conventional hand-held
GSM phone. The Radio Unit (RU) is powered by the car battery and some parts of the
electronics are permanently powered for wakeup functionality. The GSM part of the
phone is based around a modified NPL-1 (6310i) phone unit and has a 2W RF transmitter.
The user interface consists of an input device, designated CUW-3, and display unit, des-
ignated SU-11 (N610) or SU21 (N616), which are connected to the RU by cable. Audio
interface can be via standard Nokia accessories, such as handsfree microphone and
speaker units, designated HFM-8 and SP-2, which are connected to the RU by cable.
The power connector is a four-pin connector, which is the entry point for unit power and
ground return. It also has a pin for connection to the ignition sense (IGNS) wire in the
car loom for detection of wake up functionality. The last pin is for connection to the car
radio mute (CRM) wire of the vehicle radio to mute the car radio when a call is incoming
or outgoing.
The hands free (HF) microphone connector is an audio jack for connection for the HFM-8
microphone. This hands free microphone allows audio hands-free use of the unit. The
hands free speaker connector is complementary to the HF microphone and connects to
the SP-2 hands free speaker.
The display units (SU-11/21) are externally designed and manufactured parts, which con-
tain the screen showing the user the current status of the phone unit and allowing setup
information to be viewed. The communication between the DU and the RU is done via
the FBUS. Power for the display unit is from the same source as that for the input device.
The display unit controls the input device via two signal lines, which are looped through
the Junction Board (JB). Additional pins of this connector are used for flashing and other
production purposes.
The input device (CUW-3) is an externally designed and manufactured part, which allows
the user to navigate through the menus shown on the display unit screen. The JB sup-
plies power to the input device though all control of the input device is done by the dis-
play unit.

Internal Signals and Connections

Interfacing between the JB and the EB requires level shifting of incoming and outgoing
signals to the correct voltage level depending on the destination. The JB devices are
based on 5V logic while the EB has both 1.8V and 2.8V devices. Some of the signals used
for production testing are already at the correct level and do not need further processing
by the JB except for ESD-EMC protection.

User Interface

Display units SU-11/21 provide an 84 x 24 pixel monochrome display with a row of fixed
icons on the top and a fixed icon signal bar on the left. The display is connected via
external FBus connector to the RU TFE-4/RV-1. For user data input the input device
Issue 2.0 Mar/2005
Company Confidential
Copyright © 2005 Nokia Corporation.
Company Confidential
TF5 Technical Information
Page 8a-5




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