User Guide

CCS Technical Documentation Troubleshooting — BB
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 5
Troubleshooting - Baseband
Overview
The Baseband module of RH-17 transceiver is a CDMA single band engine. The Baseband
architecture is based on the DCT4 Apollo engine.
RH-17 Baseband consists of three ASICs: Universal Energy Management (UEM), Universal
Phone Processor (UPP), and a 64-megabit Flash.
The Baseband architecture supports a power-saving function called “sleep mode”. This
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 32kHz crystal. The phone
awakes by a timer running from this 32kHz clock. The sleep is determined by network
parameters. Sleep mode is entered when both the MC and the DSP are in standby mode
and the normal VCTCXO clock is switched off.
RH-17 supports both 2- and 3-wire DCT3-type wire chargers. However, the 3-wire
chargers are treated as 2-type wire chargers. Charging is controlled by UEM ASIC and EM
SW.
BL-5C Li-ion battery is used as main power source for RH-17. BL-5C has nominal capac-
ity of 850 mAh.