Functional Description; Power Distribution - Nokia NSE-6 SERIES Service Manual

NSE–6
System Module

Functional Description

Power Distribution

In normal operation the baseband is powered from the phone's battery.
The battery consists of three Nickel Metal Hydride cells. There is also a
possibility to use batteries consisting of one Lithium–Ion cell. An external
charger can be used for recharging the battery and supplying power to
the phone. The charger can be either a standard charger that can deliver
around 400 mA or so called performance charger, which can deliver sup-
ply current up to 850 mA.
The baseband contains components that control power distribution to
whole phone excluding those parts that use continuous battery supply.
The battery feeds power directly to following parts of the system: CCONT,
power amplifier, and UI (buzzer, display, keyboard lights, IR and vibra).
Figure below shows a block diagram of the power distribution.
The power management circuit CHAPS provides protection agains over-
voltages, charger failures and pirate chargers etc. that would otherwise
cause damage to the phone.
PA SUPPLY
UI
Page 3 – 16
RF SUPPLIES
VCOBBA
COBBA
VBB
PWRONX
CNTVR
VBAT
VBB
MAD
+
MEMORIES
BASEBAND
Technical Documentation
VSIM
CCONT
PWM
RTC
VBB
BACKUP
PURX
VBAT
LIM
CHAPS
VIN
DC–jack
PAMS
SIM
BATTERY
Original 08/98