User Guide

CCS Technical Documentation System Module
RH-10
Issue 1 09/2002 Nokia Corporation Confidential Page 11
Baseband Module
The core part of the RH-10 baseband module consists of two ASICs—UEM and UPP—and
flash memory. The following sections describe these parts.
UEM
UEM Introduction
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. RH-10 has a DC/DC connector
to provide power to the UPP VCORE.
Bypass capacitor (1uF) is required for each regulator output to ensure stability.
Reference voltages for regulators require external 1uF capacitors. Vref25RF is reference
voltage for VR2 regulator; Vref25BB is reference voltage for VANA, VFLASH1, VFLASH2,
UEM
UPP
IR
EAR
MIC
BUZZER
V
IBRA
RF Supplies
BATTERY
PA supply
UI
CBUS/DBUS
BB Supplies
SLEEPCLOCK
32kHz
FLASH
MEMADDA
MEMCONT
SAFARI
RFCLK
19.44MHz
BASEBAND
DCT4 System Connector
EXTERNAL AUDIO
CHARGER CONNECTION
KLIGHT/DLIGHT
PWR ON
A
UDIO
PURX
RFIC CTRL
RF RX/T
X
RF RX/TX