Nokia RM-555 Service Manual page 193

RM-555
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
Battery drains fast
Power key and system power-up
Power distribution
Clocking scheme .............................................................................................................................................
Bluetooth and FM RDS radio
I/O Expander ........................................................................................................................................................
GPS interface ........................................................................................................................................................
WLAN module ......................................................................................................................................................
High-speed USB....................................................................................................................................................
CBUS interface......................................................................................................................................................
FBUS interface ......................................................................................................................................................
ECI interface .........................................................................................................................................................
USB charger interface..........................................................................................................................................
SIM interface ........................................................................................................................................................
MicroSD card interface
Camera concept ...................................................................................................................................................
Camera concept ..............................................................................................................................................
User interface.......................................................................................................................................................
Resistive touch screen
Proximity sensor
Touch screen controller
Display .............................................................................................................................................................
Backlight and illumination............................................................................................................................
Digital Ambient Light Sensor (ALS)
Hall sensor.......................................................................................................................................................
Magnetometer ................................................................................................................................................
ASICs......................................................................................................................................................................
RAPIDOYAWE ..................................................................................................................................................
EM ASIC BETTY N2300
EM ASIC VILMA N2200
Device memories .................................................................................................................................................
Combo memory ..............................................................................................................................................
Audio concept ......................................................................................................................................................
Audio HW architecture...................................................................................................................................
Internal microphone
Internal earpiece ............................................................................................................................................
Internal speakers............................................................................................................................................
Vibra circuitry .................................................................................................................................................
Accessory AV connector
DA converter and headphone
Baseband technical specifications.....................................................................................................................
External interfaces
SIM IF connections..........................................................................................................................................
Charger connector and charging interface connections & electrical characteristics
Issue 1
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troubleshooting.............................................................................................................
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amplifier.......................................................................................................
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COMPANY CONFIDENTIAL
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Table of Contents
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6-10
6-11
6-11
6-12
6-13
6-14
6-15
6-16
6-18
6-18
6-19
6-19
6-19
6-19
6-20
6-21
6-21
6-21
6-23
6-23
6-23
6-23
6-24
6-25
6-26
6-27
6-27
6-27
6-27
6-27
6-28
6-28
6-28
6-28
6-28
6-29
6-29
6-30
6-30
6-30
6-32
6-32
6-32
6-32
.............................. 6-33
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