Nokia N72 Service Manual page 239

RM-180
System Module
Baseband description............................................................................................................................................9-7
System module block diagram........................................................................................................................9-7
Baseband functional description.....................................................................................................................9-7
Absolute maximum ratings............................................................................................................................9-10
Phone modes of operation.............................................................................................................................9-10
Power distribution..........................................................................................................................................9-12
Clocking scheme..............................................................................................................................................9-13
Bluetooth/FM module.....................................................................................................................................9-14
USB....................................................................................................................................................................9-15
SIM interface....................................................................................................................................................9-16
RS MMC interface.............................................................................................................................................9-16
Battery interface..............................................................................................................................................9-17
Camera interface.............................................................................................................................................9-18
Camera interface........................................................................................................................................9-18
Camera construction..................................................................................................................................9-18
Back camera slider detection switch.......................................................................................................9-20
Flash LED.....................................................................................................................................................9-20
User interface..................................................................................................................................................9-22
Display interface.........................................................................................................................................9-22
Keyboard.....................................................................................................................................................9-23
Display and keyboard backlight...............................................................................................................9-24
ALS interface...............................................................................................................................................9-25
ASICs.................................................................................................................................................................9-26
RAP ASIC.......................................................................................................................................................9-26
EM ASIC N2200............................................................................................................................................9-26
EM ASIC N2300............................................................................................................................................9-27
Device memories.............................................................................................................................................9-27
RAP memories NOR flash and SDRAM.......................................................................................................9-27
Combo memory..........................................................................................................................................9-27
Audio concept.......................................................................................................................................................9-28
Audio HW architecture....................................................................................................................................9-28
Internal microphone.......................................................................................................................................9-29
External microphone.......................................................................................................................................9-29
Internal earpiece.............................................................................................................................................9-30
Internal speaker..............................................................................................................................................9-30
External earpiece.............................................................................................................................................9-31
Vibra circuitry..................................................................................................................................................9-31
Pop-portTM connector....................................................................................................................................9-32
Baseband technical specifications......................................................................................................................9-33
External interfaces..........................................................................................................................................9-33
External interfaces.....................................................................................................................................9-33
ACI interface electrical characteristics.....................................................................................................9-33
VOUT electrical characteristics..................................................................................................................9-34
USB IF electrical characteristics................................................................................................................9-34
FBUS interface electrical characteristics (between RAP and N2300)....................................................9-35
Headset hook detection interface (XMICN) electrical characteristics....................................................9-35
Audio signal electrical characteristics......................................................................................................9-36
SIM IF connections......................................................................................................................................9-36
RS MMC interface connections...................................................................................................................9-36
Charger connector and charging interface connections & electrical characteristics..........................9-37
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