User Guide

RM-11
Troubleshooting - Baseband CC Technical Documentation
Page 4 ©2004 Nokia Corporation Confidential Issue 1 02/2004
Troubleshooting Overview
The baseband module of the RM-11 transceiver is a trimode, CDMA, dual-band engine
and consists of three main Application Specific Integrated Circuits (ASICs):
• Universal Energy Management (UEM)
• Universal Phone Processor (UPP)
• A 128-Megabit FLASH
The baseband architecture is based on the DCT4 Apollo engine and supports a
power-saving function called sleep mode. Sleep mode shuts off the VCTCXO, which is
used as a system clock source for both the RF and the baseband. The phone awakens by a
timer running from this 32 kHz clock. The sleep time is determined by network
parameters. During the sleep mode, the system runs from a 32 kHz crystal. 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 RM-11 supports both two and three DCT3 type wire chargers. However, the 3-wire
chargers are treated as two-type wire chargers. Charging is controlled by the UEM ASIC
and EM SW.
A BLD-3 Li-ion battery is used as the main power source. The BLD-3 has a nominal
capacity of 780 mAh.