Nokia NSB-7 Series Service Manual page 16

NSB-7
System Module
Table of Contents
System Module ........................................................................................................................1
Transceiver NSB-7 ................................................................................................................................... 6
Introduction ........................................................................................................................................... 6
Operational Modes ............................................................................................................................ 6
Interconnection Diagram ................................................................................................................... 7
System Module......................................................................................................................................... 8
Baseband Module ................................................................................................................................. 8
Block Diagram..................................................................................................................................... 8
Technical Summary ........................................................................................................................... 9
Technical Specifications ...................................................................................................................10
Absolute Maximum Ratings ........................................................................................................ 10
DC Characteristics .......................................................................................................................... 10
External and Internal Signals and Connections..................................................................... 10
DC (charger) connector ...............................................................................................................10
Service Connector .........................................................................................................................11
Battery connector .........................................................................................................................11
SIM card connector ......................................................................................................................12
RTC backup battery ......................................................................................................................12
Functional Description ......................................................................................................................13
Power Distribution.......................................................................................................................... 13
Battery Interface............................................................................................................................. 13
Battery charging ...........................................................................................................................14
Startup Charging ..........................................................................................................................14
Battery Overvoltage Protection ................................................................................................15
Battery Removal During Charging ...........................................................................................16
PWM .................................................................................................................................................16
Battery Identification ..................................................................................................................16
Battery Temperature ....................................................................................................................18
Supply Voltage Regulators .........................................................................................................19
Switched Mode Supply VSIM ....................................................................................................21
Power Up and Power Down ......................................................................................................... 22
Power up with charger ................................................................................................................22
Power Up with the Power Switch (PWRONX) ......................................................................23
Power Up by RTC ...........................................................................................................................24
Power Up by IBI .............................................................................................................................24
Power Down ...................................................................................................................................24
Modes of Operation ....................................................................................................................... 25
Acting Dead ....................................................................................................................................25
Active Mode ...................................................................................................................................25
Sleep Mode .....................................................................................................................................25
Charging ..........................................................................................................................................26
Watchdog .......................................................................................................................................26
Audio Control................................................................................................................................... 27
PCM serial interface ....................................................................................................................27
Digital Control ................................................................................................................................. 28
MAD2 WD1 .....................................................................................................................................28
Memories........................................................................................................................................... 37
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