Nokia RM-57 Service Manual page 330

Nokia 6681/6682 mobile terminal

Table of Contents

Nokia Customer Care

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

UI module connector and IF connections.................................................................................................................9-35

Keyboard interface electrical characteristics...........................................................................................................9-36

Display connector and interface connections..........................................................................................................9-36

Camera interface connections and electrical characteristics..............................................................................9-37

Slider switch electrical characteristics.......................................................................................................................9-40

Flash LED interface and electrical characteristics...................................................................................................9-40

Back-up battery interface connections and electrical characteristics..............................................................9-40

RF description................................................................................................................................................................................9-41

Introduction to receiver functionality..............................................................................................................................9-41

GSM receiver.............................................................................................................................................................................9-41

Introduction to transmitter functionality.......................................................................................................................9-41

GSM transmitter.......................................................................................................................................................................9-41

Frequency synthesizers.........................................................................................................................................................9-44

Regulators.................................................................................................................................................................................9-45

Frequency mappings...................................................................................................................................................................9-46

GSM850 frequencies...............................................................................................................................................................9-46

EGSM900 frequencies.............................................................................................................................................................9-47

GSM1800 frequencies............................................................................................................................................................9-48

GSM1900 frequencies............................................................................................................................................................9-49

List of Tables

Table 18 Keymatrix......................................................................................................................................................................9-21

Table 19 ALS resistor values......................................................................................................................................................9-22

Table 20 Audio connector pin assignments.........................................................................................................................9-28

Table 21 Charging interface connections..............................................................................................................................9-33

Table 22 Charging IF electrical characteristics....................................................................................................................9-33

Table 23 Battery interface connections.................................................................................................................................9-34

Table 24 Battery IF electrical characteristics........................................................................................................................9-34

Table 25 User interface connections......................................................................................................................................9-35

Table 26 Display interface connections.................................................................................................................................9-36

Table 27 Camera interface connections................................................................................................................................9-37

Table 28 Camera CCP IF electrical characteristics...............................................................................................................9-39

Table 29 Camera supply voltage characteristics.................................................................................................................9-39

Table 30 Camera control IF electrical characteristics........................................................................................................9-39

Table 31 Flash LED interface connections.............................................................................................................................9-40

Table 32 Flash LED interface electrical characteristics .....................................................................................................9-40

Table 33 Back-up battery connections...................................................................................................................................9-40

Table 34 Back-up battery electrical characteristics...........................................................................................................9-41

List of Figures

Figure 92 System level block diagram......................................................................................................................................9-7

Figure 93 Functional block diagram.........................................................................................................................................9-8

Figure 94 Helen3 high level block diagram............................................................................................................................9-9

Figure 95 State diagram.............................................................................................................................................................9-11

Figure 96 Power distribution diagram..................................................................................................................................9-12

Figure 97 System start-up timing............................................................................................................................................9-14

Figure 98 Clocking scheme........................................................................................................................................................9-15

Figure 99 SIM interface...............................................................................................................................................................9-16

Figure 100 MMC interface...........................................................................................................................................................9-16

Page 9-4

Company Confidential

RM-57/58

System Module

Issue 1

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