User Guide

Nokia Customer Care System Module
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Issue 1 - Revision 002 09/2004 ©2004 Nokia Corporation Company Confidential Page 7
Figure 2: Baseband module diagram
UEM
UEM is the Universal Energy Management IC for DCT4 digital handportable phones. In
addition to energy management, it performs all the baseband mixed-signal functions.
Most of UEM pins have 2kV ESD protection. Those signals that are considered to be
exposed more easily to ESD have 8kV protection inside UEM. Such signals are all audio
signals, headset signals, BSI, Btemp, Fbus, and Mbus signals.
Regulators
UEM has six regulators for baseband power supplies and seven regulators for RF power
supplies. VR1 regulator has two outputs VR1a and VR1b.
Bypass capacitor (1uF) is required for each regulator output to ensure stability.
UEM
Apollo 2
RF Supplies
RF RX/TX
CBUS/DBUS
UPP
RFIC CTRL 19.2 MHz
PURX
RF RX/TX
Sleep Clock 32 kHz
AUDIO
BB Supplies
MEMADDA
MEMCONT
FLASH
DCT4 System
Connector
External Audio
Charger
Connection
Vibra
Buzzer
Ear
MIC
BATTERY
PA Supply