User Guide

RH-37
System Module Nokia Customer Care
Page 18 Nokia Corporation Issue 1 07/04
2 Backup
3Acting Dead
4Active
5 Sleep
6 Charging
No Supply
In NO_SUPPLY mode, the phone has no supply voltage. This mode is due to the discon-
nection of the main battery and backup battery or low battery voltage level in both of
the batteries.
The phone is exiting from NO_SUPPLY mode when sufficient battery voltage level is
detected. The battery voltage can rise either by connecting a new battery with VBAT >
V
MSTR+
or by connecting charger and charging the battery 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
).
The VRTC regulator is disabled in BACKUP mode. VRTC output is supplied without regula-
tion from the backup battery (VBACK). All the other regulators are disabled.
BACKUP mode is not used in RH-37 since the product has no backup battery.
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 bat-
tery-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 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.
In Active mode the RF regulators are controlled by SW writing into UEMEK´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 2.78V or 3.3V. VR4-VR7 can be enabled, dis-
abled, or forced into the low quiescent current mode. VR3 is always enabled in Active
mode.