Nokia 6020b 서비스 매뉴얼
RM-31
Nokia Customer Care
7 - System Module
18
COMPANY CONFIDENTIAL
Issue 1 03/2005
Copyright © 2005 Nokia. All Rights Reserved.
Active
In Active mode, the phone is in normal operation, scanning for channels, listing to a base sta-
tion, transmitting and processing information.
tion, transmitting and processing information.
Sleep Mode
Sleep mode is entered when both MCU and DSP are in stand–by mode. Both processors con-
trol the sleep mode.
trol the sleep mode.
The sleep mode is exited either by the expiration of a sleep clock counter in the UEMEK or by
some external interrupt, generated by a charger connection, key press, headset connection
etc.
some external interrupt, generated by a charger connection, key press, headset connection
etc.
In the sleep mode, VCTCXO is shut down and 32 kHz sleep clock oscillator is used as refer-
ence clock for the Baseband.
ence clock for the Baseband.
Charging
In RM-31, the battery type/size is indicated by a BSI-resistor. The resistor value corresponds
to a specific battery capacity. Also BTEMP, NTC resistor, is located on an engine board.
to a specific battery capacity. Also BTEMP, NTC resistor, is located on an engine board.
The battery voltage, temperature, size and current are measured by the UEMEK controlled by
the charging software running in the UPP.
the charging software running in the UPP.
The charging control circuitry (CHACON) inside the UEMEK controls the charging current de-
livered from the charger to the battery. The battery voltage rise is limited by turning the UEMEK
switch off when the battery voltage has reached 4.2 V. Charging current is monitored by meas-
uring the voltage drop across a 220 m
livered from the charger to the battery. The battery voltage rise is limited by turning the UEMEK
switch off when the battery voltage has reached 4.2 V. Charging current is monitored by meas-
uring the voltage drop across a 220 m
Ω resistor.
■
Power distribution
Under normal conditions, the battery powers the baseband module. Individual regulators locat-
ed within the UEMEK regulate the battery voltage VBAT. These regulators supply the different
parts of the phone. 7 regulators are dedicated to the RF module and 7 to the baseband module.
ed within the UEMEK regulate the battery voltage VBAT. These regulators supply the different
parts of the phone. 7 regulators are dedicated to the RF module and 7 to the baseband module.
The VSIM regulator is able to deliver both 1,8V and 3,0 V DC and thus supporting two different
SIM technologies.
SIM technologies.
The system connector provides a voltage to supply accessories.
The white LEDs need a higher voltage supply than the battery can supply and are fed by a sep-
arate external voltage regulator.
arate external voltage regulator.
VBAT is directly distributed to the RF power amplifier, Vibra, IR Module and external baseband
regulators.
regulators.