System Module; Baseband Module; Block Diagram - Nokia NSB-6 Series Technical Documentation Manual

NSB–6

System Module

System Module

Baseband Module

The baseband architecture supports a power saving function called "sleep
mode". This sleep mode shuts off the VCTCXO, which is used as system
clock source for both RF and baseband. During the sleep mode the sys-
tem runs from a 32 kHz crystal. The phone is waken up by a timer run-
ning from this 32 kHz clock supply. The sleeping time is determined by
some network parameters. The sleep mode is entered when both the
MCU and the DSP are in standby mode and the normal VCTCXO clock
has been switched off.
The battery charging is controlled by a PWM signal from the CCONT. The
PWM duty cycle is determined by a charging software and is fed to the
CHAPS charging switch.
Two types of chargers can be connected to the phone. Standard chargers
(two wires) provide coarse supply power, which is switched by the
CHAPS for suitable charging voltage and current. Advanced chargers
(three wires) are equipped with a control input. Three wire chargers are
treated like two wire ones.

Block Diagram

TX/RX SIGNALS
COBBA
UI
IR
BASEBAND
Page 8
RF SUPPLIES
COBBA SUPPLY
CCONT
BB SUPPLY
MAD
+
MEMORIES
EXT. AUDIO
HS–connector
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
PA SUPPLY 13MHz
CLK
SIM
32kHz
CLK
SLEEP CLOCK
VBAT
CHAPS
Charger
connector
SYSTEM CLOCK
BATTERY
Issue 1 06/2000