Nokia 6233 Service Manual page 175

RM-123; RM-145
System Module
Introduction............................................................................................................................................................8-5
Block diagram....................................................................................................................................................8-5
Energy management..............................................................................................................................................8-7
Battery and interface........................................................................................................................................8-7
Normal and extreme voltages.........................................................................................................................8-7
Power key and system power-up....................................................................................................................8-8
Modes of operation...........................................................................................................................................8-8
Power distribution............................................................................................................................................8-9
Clocking scheme................................................................................................................................................8-9
USB, SIM, MMC.......................................................................................................................................................8-10
USB....................................................................................................................................................................8-10
SIM interface....................................................................................................................................................8-10
µSD card interface...........................................................................................................................................8-11
Camera...................................................................................................................................................................8-11
Camera.............................................................................................................................................................8-11
User interface........................................................................................................................................................8-12
Display interface..............................................................................................................................................8-12
Keyboard and side keys..................................................................................................................................8-12
Backlight and illumination.............................................................................................................................8-13
Audio concept.......................................................................................................................................................8-14
Audio hardware architecture.........................................................................................................................8-14
Internal microphone.......................................................................................................................................8-15
External microphone.......................................................................................................................................8-16
Internal earpiece.............................................................................................................................................8-16
Internal speaker..............................................................................................................................................8-17
External earpiece.............................................................................................................................................8-17
Vibra circuitry..................................................................................................................................................8-18
Pop-portTM connector....................................................................................................................................8-18
Bluetooth and FM radio.......................................................................................................................................8-19
Bluetooth.........................................................................................................................................................8-19
FM radio............................................................................................................................................................8-20
RF description.......................................................................................................................................................8-21
Introduction to receiver functionality...........................................................................................................8-21
WCDMA receiver functionality........................................................................................................................8-21
GSM receiver functionality..............................................................................................................................8-21
Introduction to transmitter functionality.....................................................................................................8-21
WCDMA transmitter functionality..................................................................................................................8-21
GSM transmitter functionality........................................................................................................................8-22
Frequency synthesizers..................................................................................................................................8-23
Regulators........................................................................................................................................................8-23
List of Tables
Table 16 Nominal voltages....................................................................................................................................8-7
Table 17 Pop-PortTMpin and signal table..........................................................................................................8-18
List of Figures
Figure 55 Block diagram........................................................................................................................................8-6
Figure 56 Battery pin order...................................................................................................................................8-7
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