User Guide

CCS Technical Documentation 7 - System Module & UI
Company Confidential NMM-3
Issue 1 (11/2003) Copyright  2003 Nokia Corporation Page 7-9
Company Confidential
Active
In the active mode the phone is in normal operation, scanning for channels, listening to
a base station, transmitting and processing information. There are several sub–states in
the active mode depending on if the phone is in burst reception, burst transmission, if
DSP is working etc.
One of the sub–state of the active mode is Bluetooth on state, enabled by UEME. Blu-
tooth circuitry is controlled by the MCU and 26MHz reference clock is generated by the
Module TCXO.
In active mode the RF regulators are controlled by SW writing into UEMEs register set-
tings: VR1A can be enabled or disabled. VR2 can be enabled or disabled and VR4 –VR7
can be enabled or disabled or forced into low quiescent current mode. VR3 is always
enabled in active mode.
Sleep mode
Sleep mode is entered when the MCU and both DSPs are in stand–by mode. Sleep is con-
trolled by the processor. When SLEEPX low signal is detected UEME enters SLEEP mode.
VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All RF reg-
ulators are disabled in SLEEP. When SLEEPX=1 goes high, UEME enters ACTIVE mode and
all functions are activated.
The sleep mode is exited either by the expiration of a sleep clock counter in the UEME or
by some external interrupt, generated by a charger connection, key press, headset con-
nection etc.
In sleep mode the 19.2MHz ref clock (VCTCXO) is shut down and 32 kHz sleep clock
oscillator is used as reference clock for the baseband.
Charging
The battery voltage, temperature, size and current are measured by UEME controlled by
the charging software running in TIKU.
The charging control circuitry (CHACON) inside the UEME controls the charging current
delivered from the charger to the battery. The battery voltage rise is limited by turning
the UEME switch off when the battery voltage has reached 4.2 V. Charging current is
monitored by measuring the voltage drop across a 220 mOhm resistor R200.
Battery
850 mAh Li-ion battery pack BL-5C is used in NMM-3.
Nominal discharge cut–off voltage 3.35V
Nominal battery voltage 3.7V
Nominal charging voltage 4.2V