User Guide

CCS Technical Documentation System Module
NPM-2NX
Issue 1 07/02 ãNokia Corporation Page 9
to energy management it performs all the baseband mixed-signal functions.
Most of UEM pins have 2kV ESD protection and those signals, which 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.
Blocks
REGULATORS
UEM has 6 regulators for BB power supplies and 7 regulators for RF power supplies. VR1
regulator has 2 outputs VR1a and VR1b. In addition there are 2 current generators IPA1
and IPA2 for biasing purposes.
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,
VR1 regulators, Vref278 is reference voltage for VR3, VR4, VR5, VR6, VR7 regulators,
VrefRF01 is reference voltage for VIO, VCORE, VSIM regulators and for RF.
Table 1: UEM Regulators
VANA regulator supplies internal and external analog circuitry of BB. It is disabled in
sleep mode.
Vflash1 regulator supplies LCD, IR-module and digital parts of UEM and Safari_GTE asic.
It is enabled during startup and goes to low Iq-mode in sleep mode.
Vflash2 regulator supplies data cable (DLR-3). It's enabled/disenabled through writing
register and default is off.
VIO regulator supplies both external and internal logic circuitries. It is used by LCD, flash
and UPP. Regulator goes in low Iq-mode in sleep mode.
BB RF Current
VANA: 2.78Vtyp 80mAmax VR1a:4.75V 10mAmax
VR1b:4.75V
IPA1: 0-5mA
Vflash1: 2.78Vtyp 70mAmax IPA2: 0-5mA
Vflash2: 2.78Vtyp
40mAmax
VR2:2.78V 100mAmax
VSim: 1.8/3.0V 25mAmax VR3:2.78V 20mA
VIO: 1.8Vtyp
150mAmax
VR4: 2.78V 50mAmax
Vcore: 1.0-1.8V
200mAmax
VR5: 2.78V 50mAmax
VR6: 2.78V 50mAmax
VR7: 2.78V 45mAmax