NHM–7
System Module & UI
PAMS Technical Documentation
Page 20
Issue 1 10/2001
Nokia Corporation
Functional Description
Modes of Operation
LA5 baseband engine has six different operating modes:
– No supply
– Backup
– Acting Dead
– Active
– Sleep
– Charging
No supply
In NO_SUPPLY mode the phone has no supply voltage. This mode is due
to disconnection of main battery and backup battery or low battery voltage
level in both of the batteries.
Phone is exiting from NO_SUPPLY mode when sufficient battery voltage
level is detected. Battery voltage can rise either by connecting a new bat-
tery with VBAT > V
MSTR+
or by connecting charger and charging the bat-
tery above V
MSTR+
.
Backup
In BACKUP mode the backup battery has sufficient charge but the main
battery can be disconnected or empty (VBAT < V
MSTR
and VBACK >
VBU
COFF
).
VRTC regulator is disabled in BACKUP mode. VRTC output is supplied
without regulation from backup battery (VBACK). All the other regulators
are disabled.
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
In the active mode the phone is in normal operation, scanning for chan-
nels, 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 FM radio on state. In that case
UEM audio blocks and FM radio are powered on. FM radio circuitry is
controlled by the MCU and 75kHz reference clock is generated in the
UPP. VFLASH2 regulator is operating.
In active mode the RF regulators are controlled by SW writing into UEM’s
registers wanted settings: VR1A can be enabled or disabled. VR2 can be
enabled or disabled and its output voltage can be programmed to be
Summary of Contents for NHM-7 series
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