Nokia 6680 RM-36 Service Manual page 409

RM-36
System Module
Baseband description...................................................................................................................................................................9-7
System module block diagram............................................................................................................................................9-7
Baseband functional description........................................................................................................................................9-7
Absolute maximum ratings................................................................................................................................................9-10
Modes of operation...............................................................................................................................................................9-10
Power distribution................................................................................................................................................................9-13
Clocking scheme.....................................................................................................................................................................9-15
Bluetooth..................................................................................................................................................................................9-16
USB..............................................................................................................................................................................................9-16
SIM interface............................................................................................................................................................................9-16
RS MMC interface....................................................................................................................................................................9-17
Battery interface....................................................................................................................................................................9-18
Battery interface....................................................................................................................................................................9-18
Camera interface....................................................................................................................................................................9-19
Back camera slider detection switch...............................................................................................................................9-19
Flash LED...................................................................................................................................................................................9-20
Front camera...........................................................................................................................................................................9-21
User interface..........................................................................................................................................................................9-22
Display interface...............................................................................................................................................................9-22
Keyboard.............................................................................................................................................................................9-23
Display and keyboard backlight..................................................................................................................................9-23
ALS interface......................................................................................................................................................................9-24
ASICs...........................................................................................................................................................................................9-24
RAP3G ASIC.........................................................................................................................................................................9-24
Retu EM ASIC......................................................................................................................................................................9-25
Tahvo EM ASIC...................................................................................................................................................................9-25
Device memories...................................................................................................................................................................9-25
RAP3G memories NOR flash and SDRAM...................................................................................................................9-25
Combo memory (Helen 3).............................................................................................................................................9-26
Audio concept...............................................................................................................................................................................9-26
Audio HW architecture.........................................................................................................................................................9-26
Internal microphone.............................................................................................................................................................9-27
External microphone............................................................................................................................................................9-28
Internal earpiece....................................................................................................................................................................9-28
Internal speaker.....................................................................................................................................................................9-29
External earpiece...................................................................................................................................................................9-29
Vibra circuitry..........................................................................................................................................................................9-30
Pop-portTM connector.........................................................................................................................................................9-30
Baseband technical specifications.........................................................................................................................................9-32
External interfaces.................................................................................................................................................................9-32
External interfaces...........................................................................................................................................................9-32
ACI interface electrical characteristics.......................................................................................................................9-32
VOUT electrical characteristics.....................................................................................................................................9-33
USB IF electrical characteristics...................................................................................................................................9-33
FBUS interface electrical characteristics...................................................................................................................9-34
Headset hook detection interface (XMICN) electrical characteristics..............................................................9-34
Audio signal electrical characteristics.......................................................................................................................9-34
SIM IF connections...........................................................................................................................................................9-35
RS MMC interface connections......................................................................................................................................9-35
Charger connector and charging interface connections & electrical characteristics.................................9-36
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