User Guide

NMM-3 Company Confidential
7 - System Module & UI CCS Technical Documentation
Page 7-8 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
Environmental operating conditions
Temperature Conditions:
NMM-3 should operate with full functionality within an ambient temperature range of -
10°C to +60°C, and with reduced functionality between -25°C to -10°C and +55°C to
+75°C.
Humidity and Water Resistance:
Full functionality within humidity range of 5% to 95%.
Condensed or dripping water may cause intermittent malfunctions. Protection against
dripping water has been implemented.
Baseband Functional Description
Modes of Operation
TB4 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.
The phone exits from NO_SUPPLY mode when sufficient battery voltage level is detected.
Battery voltage can rise either by connecting a new battery with VBAT > V
MSTR+
(2.1V) 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 > 2.0V).
Real Time Clock (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.