Nokia n81 Service Manual page 189

RM-179; RM-223
System Module and User Interface
Introduction............................................................................................................................................................6-7
Phone description .............................................................................................................................................6-7
Energy management..............................................................................................................................................6-9
Battery and charging ........................................................................................................................................6-9
Backup battery................................................................................................................................................
Normal and extreme voltages
Power key and system power-up
Modes of operation
Power distribution
Clocking scheme .............................................................................................................................................
Bluetooth .............................................................................................................................................................
FM radio................................................................................................................................................................
WLAN ....................................................................................................................................................................
USB ........................................................................................................................................................................
CBUS interface......................................................................................................................................................
FBUS ......................................................................................................................................................................
ECI interface .........................................................................................................................................................
Charger interface .................................................................................................................................................
SIM interface ........................................................................................................................................................
µSD card interface ...............................................................................................................................................
Camera concept ...................................................................................................................................................
Cameras...........................................................................................................................................................
Main camera characteristics..........................................................................................................................
Secondary camera characteristics
Camera flash ...................................................................................................................................................
Hardware accelerator
User interface.......................................................................................................................................................
Display module ...............................................................................................................................................
Keyboard and other
Backlight and illumination............................................................................................................................
Display and menu key
ITUT keyboard and side key illumination
NaviWheel illumination (power LED)
Hall sensor.......................................................................................................................................................
ASICs......................................................................................................................................................................
RAPIDO ASIC.....................................................................................................................................................
EM ASIC N2300 ................................................................................................................................................
EM ASIC N2200 ................................................................................................................................................
Combo memory ...................................................................................................................................................
Audio concept ......................................................................................................................................................
Audio HW architecture...................................................................................................................................
Internal microphone
External microphone......................................................................................................................................
Internal earpiece ............................................................................................................................................
Internal speakers............................................................................................................................................
External earpiece............................................................................................................................................
Vibra circuitry .................................................................................................................................................
AV connector...................................................................................................................................................
Baseband technical specifications.....................................................................................................................
External interfaces
Issue 1
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keys...............................................................................................................................
illumination.........................................................................................................
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COMPANY CONFIDENTIAL
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Table of Contents
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6-10
6-11
6-11
6-11
6-13
6-13
6-14
6-15
6-16
6-17
6-18
6-18
6-18
6-18
6-18
6-19
6-19
6-19
6-19
6-20
6-21
6-23
6-24
6-24
6-26
6-28
6-28
6-29
6-30
6-31
6-32
6-32
6-32
6-32
6-33
6-33
6-33
6-34
6-34
6-35
6-36
6-37
6-38
6-38
6-39
6-39
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