PAMS Technical Documentation
System Module
NSB-7
Issue 1 06/00
ã
Nokia Mobile Phones Ltd.
Page 13
Functional Description
Power Distribution
In normal operation the baseband is powered from the phone‘s battery. The battery con-
sists of one Lithium-Ion cell. An external charger can be used for recharging the battery
and supplying power to the phone.
The baseband contains parts that control power distribution to whole phone excluding
those parts that use continuous battery supply. The battery feeds power directly to the
CCONT and UI (buzzer and display and keyboard lights).
The power management circuit CHAPS provides protection against over voltages, charger
failures and pirate chargers etc. that would otherwise cause damage to the phone.
Figure 2: Block Diagram of Power Distribution
Battery Interface
Backup battery supply to
CCONT
80
uA
Signal
Parameter
Min
Typ
Max
Unit
Notes
Baseband
Charger & headset connector
CHAPS
CCONT
COBBA GJP
MAD2 +
MEMORY
Battery connector
VChar
Vbatt
RF
CHRG_CTRL
VB
RF supply voltages
VCobba
Vbb
VCORE
UI
(LCD,
backlights,
buzzer)
RTC backup
Содержание NSB-7 Series
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