Power Distribution; Battery Charging - Nokia NSM-3 Series Technical Documentation Manual

NSM–3/3D
System Module

Power Distribution

In normal operation the baseband is powered from the phone's battery.
The battery consists 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 bat-
tery 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.
PA SUPPLY
UI
VBB
BASEBAND

Battery charging

The electrical specifications give the idle voltages produced by the ac-
ceptable chargers at the DC connector input. The absolute maximum in-
put voltage is 30V due to the transient suppressor that is protecting the
charger input. At phone end there is no difference between a plug–in
charger or a desktop charger. The DC–jack pins and bottom connector
charging pads are connected together inside the phone.
Page 14
RF SUPPLIES
VCOBBA
CCONT
COBBA
VBB
PWRONX
CNTVR
VBAT
VBB
PURX
MAD
+
MEMORIES
CHARGER CONNECTOR
E Nokia Corporation
PAMS Technical Documentation
VSIM
PWM
RTC
BACKUP
VBAT
LIM
CHAPS
VIN
Issue 4 02/2002
SIM
BATTERY