Nokia RM-57 Service Manual page 329

Nokia 6681/6682 mobile terminal

Table of Contents

RM-57/58

System Module

Baseband description....................................................................................................................................................................9-7

System module block diagram.............................................................................................................................................9-7

Baseband functional description.........................................................................................................................................9-7

Absolute maximum ratings...................................................................................................................................................9-9

Modes of operation................................................................................................................................................................9-10

Power distribution.................................................................................................................................................................9-12

Clocking scheme......................................................................................................................................................................9-14

Bluetooth...................................................................................................................................................................................9-15

USB...............................................................................................................................................................................................9-15

SIM interface.............................................................................................................................................................................9-15

RS MMC interface.....................................................................................................................................................................9-16

Battery interface.....................................................................................................................................................................9-17

Camera interface.....................................................................................................................................................................9-17

Back camera slider detection switch................................................................................................................................9-18

Flash LED....................................................................................................................................................................................9-19

User interface...........................................................................................................................................................................9-20

Display interface................................................................................................................................................................9-20

Keyboard..............................................................................................................................................................................9-21

Display and keyboard backlight...................................................................................................................................9-21

ALS interface.......................................................................................................................................................................9-22

ASICs............................................................................................................................................................................................9-22

RAP3G ASIC..........................................................................................................................................................................9-22

Retu EM ASIC.......................................................................................................................................................................9-23

Tahvo EM ASIC.....................................................................................................................................................................9-23

Device memories.....................................................................................................................................................................9-23

RAP3G memories NOR flash and SDRAM....................................................................................................................9-23

Combo memory.................................................................................................................................................................9-23

Audio concept................................................................................................................................................................................9-24

Audio HW architecture..........................................................................................................................................................9-24

Internal microphone..............................................................................................................................................................9-24

External microphone.............................................................................................................................................................9-25

Internal earpiece.....................................................................................................................................................................9-25

Internal speaker......................................................................................................................................................................9-26

External earpiece....................................................................................................................................................................9-26

Vibra circuitry...........................................................................................................................................................................9-27

Pop-portTM connector...........................................................................................................................................................9-27

Baseband technical specifications..........................................................................................................................................9-28

External interfaces..................................................................................................................................................................9-28

External interfaces............................................................................................................................................................9-28

ACI interface electrical characteristics........................................................................................................................9-29

VOUT electrical characteristics......................................................................................................................................9-29

USB IF electrical characteristics....................................................................................................................................9-30

FBUS interface electrical characteristics....................................................................................................................9-30

Headset hook detection interface (XMICN) electrical characteristics...............................................................9-31

Audio signal electrical characteristics........................................................................................................................9-31

SIM IF connections............................................................................................................................................................9-32

RS MMC interface connections.......................................................................................................................................9-32

Charger connector and charging interface connections & electrical characteristics..................................9-33

Battery connector and interface connections & electrical characteristics......................................................9-34

Internal interfaces..................................................................................................................................................................9-34

Issue 1

Table of Contents

Company Confidential

Nokia Customer Care

Page 9-3

Table of Contents