Nokia 8390 Manuales De Servicio
NSB-8
System Module & UI
PAMS Technical Documentation
Page 6
ãNokia Corporation
Issue 1 01/02
System Module RM8
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 system runs from a 32 kHz crystal. The phone is
waken up by a timer running from this 32 kHz clock supply. The sleep time is determined
by network parameters. Sleep mode is entered when both the MCU and the DSP are in
standby mode and the normal VCTCXO clock is switched off.
sleep mode shuts off the VCTCXO, which is used as system clock source for both RF and
baseband. During the sleep mode the system runs from a 32 kHz crystal. The phone is
waken up by a timer running from this 32 kHz clock supply. The sleep time is determined
by network parameters. Sleep mode is entered when both the MCU and the DSP are in
standby mode and the normal VCTCXO clock is switched off.
NSB-8 supports both three and two wire type of Nokia chargers. Three wire chargers are
treated like two wire ones. There is not separate PWM output for controlling charger but
it is connected to GND inside the bottom connector. Charging is controlled by UEM ASIC
(Universal Energy Management) and EM SW running in the UPP (Universal Phone Proces-
sor).
treated like two wire ones. There is not separate PWM output for controlling charger but
it is connected to GND inside the bottom connector. Charging is controlled by UEM ASIC
(Universal Energy Management) and EM SW running in the UPP (Universal Phone Proces-
sor).
The BLB-2 Li-ion battery is used as the power source for the phone.