Introduction - Nokia RM-11 Series Troubleshooting Manual

CC Technical Documentation

Introduction

The baseband module is a trimode CDMA dual-band engine based on the DCT4
architecture. The baseband consists of three main ASIC's:
• Universal Energy Management (UEM)
• Universal Phone Processor (UPP)
• 128-Megabit flash
The baseband architecture supports a power-saving function called "sleep mode". Sleep
mode shuts off the VCTCXO, which is used as system clock source for both RF and
baseband. During the sleep mode, the system runs from a 32 kHz crystal. The mobile
terminal awakes by a timer running from this 32 kHz clock. The sleep time is determined
by network parameters. Sleep mode is entered when both the MCU and the DSP are in
standby mode and the 19.2 MHz Clk (VCTCXO) is switched off.
The mobile terminal supports both two and three DCT3 type wire chargers. However, the
three-wire chargers are treated as two-type wire chargers. Charging is controlled by
UEM ASIC and EM SW.
BLD-3 Li-ion battery is used as main power source and has a nominal capacity of
780 mAh.
Issue 2 09/2005
©2005 Nokia Corporation
Troubleshooting - Baseband
Confidential
RM-11
Page 5