Modes Of Operation; Acting Dead; Active Mode; Sleep Mode - Nokia NSM-3 Series Technical Documentation Manual

NSM–3/3D
System Module
4.
The power down is controlled by the MAD. When the power key has been
pressed long enough or the battery voltage is dropped below the limit the
MCU initiates a power down procedure and disconnects the SIM power.
Then the MCU outputs a system reset signal and resets the DSP. If there
is no charger connected the MCU writes a short delay to CCONT watch-
dog and resets itself. After the set delay the CCONT watchdog expires,
which activates the PURX and all regulators are switched off and the
phone is powered down by the CCONT.
If a charger is connected when the power key is pressed the phone en-
ters into the acting dead mode.

Modes of Operation

Acting Dead

If the phone is off when the charger is connected, the phone is powered
on but enters a state called "acting dead". To the user the phone acts as if
it was switched off. A battery charging alert is given and/or a battery
charging indication on the display is shown to acknowledge the user that
the battery is being charged.

Active Mode

In the active mode the phone is in normal operation, scanning for chan-
nels, listening to a base station, transmitting and processing information.
All the CCONT regulators are operating. There are several substates in
the active mode depending on if the phone is in burst reception, burst
transmission, if DSP is working etc.

Sleep Mode

In the sleep mode all the regulators except the baseband VBB and the
SIM card VSIM regulators are off. Sleep mode is activated by the MAD
after MCU and DSP clocks have been switched off. The voltage regula-
tors for the RF section are switched off and the VCXO power control,
VCXOPwr is set low. In this state only the 32 kHz sleep clock oscillator in
CCONT is running. The flash memory power down input is connected to
the ExtSysResetX signal, and the flash is deep powered down during the
sleep mode.
The sleep mode is exited either by the expiration of a sleep clock counter
in the MAD or by some external interrupt, generated by a charger con-
nection, key press, headset connection etc. The MAD starts the wake up
sequence and sets the VCXOPwr and ExtSysResetX control high. After
VCXO settling time other regulators and clocks are enabled for active
mode.
Page 24
Setting the real time clock to power off the phone by a timer.
The RTC generates an interrupt signal, when the alarm is gone
off. The RTC interrupt signal is connected to the PWRONX line
to give a power off signal to the CCONT just like the power key.
E Nokia Corporation
PAMS Technical Documentation
Issue 4 02/2002