Troubleshooting Overview - Nokia RH-27 Series Technical Documentation Manual

RH-27
Troubleshooting - Baseband

Troubleshooting Overview

The Baseband module of the RH-27 transceiver is a trimode CDMA dual band engine. The
Baseband architecture is based on the DCT4 Apollo engine.
RH-27 Baseband consists of three main ASIC's: Universal Energy Management (UEM),
Universal Phone Processor (UPP), and a 128-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 32 kHz crystal. The phone
awakes by a timer running from this 32 kHz clock. The sleep time is determined by net-
work parameters. Sleep mode is entered when both the MCU and the DSP are in standby
mode and the 19.2MHz Clk (VCTCXO) is switched off.
RH-27 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 for RH-27. BLD-3 has nominal capac-
ity of 780 mAh.
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©2003 Nokia Corporation
CCS Technical Documentation
Confidential Issue 1 11/2003