CCS Technical Documentation
System Module
NKC-1X
Issue 1 02/03
Nokia Corporation
Page 11
Regulators
The UEM has six regulators for baseband power supplies and seven regulators for RF
power supplies. The VR1 regulator has two outputs: (1) VR1a and (2) VR1b. In addition to
these, there are two current generators - IPA1 and IPA2 - for biasing purposes.
A bypass capacitor (1uF) is required for each regulator output to ensure stability.
Reference voltages for regulators require external 1uF capacitors. Vref25RF is the refer-
ence voltage for the VR2 regulator, Vref25BB is the reference voltage for the VANA,
VFLASH1, VFLASH2, VR1 regulators, Vref278 is the reference voltage for the VR3, VR4,
VR5, VR6, VR7 regulators, and VrefRF01 is the reference voltage for the VIO, VCORE reg-
ulators and for the radio frequency (RF).
The
VANA
regulator supplies the baseband’s (BB) internal and external analog circuitry.
It is disabled in the
Sleep
mode.
The
Vflash1
regulator supplies the LCD, the digital parts of the UEM and Safari asic. It is
enabled during startup and goes into the
low Iq-mode
when in the
Sleep
mode.
The
VIO
regulator supplies both the external and internal logic circuitries. It is used by
the LCD, flash and UPP. The regulator goes into the
low Iq-mode
when in the
Sleep
mode.
The
VCORE
regulator supplies the DSP and the core part of the UPP. The voltage is pro-
grammable and the startup default is 1.5V. The regulator goes into the
low Iq-mode
when in the
Sleep
mode.
The
VR1
regulator uses two LDOs (VR1A and VR1B) and a charge pump. The charge pump
requires one external 1uF capacitor in the Vpump pin and a 220nF flying capacitor
Table 1: UEM Regulators
BB
RF
Current
VANA: 2.78Vtyp 80mAmax
VR1a:4.75V 10mAmax
VR1b:4.75V
Note: Not used in NKC-1X.
IPA1: 0-5mA
Vflash1: 2.78Vtyp 70mAmax
IPA2: 0-5mA
Vflash2: 2.78Vtyp
40mAmax
Note: Not used in NKC-1X
VR2:2.78V 100mAmax
VR3:2.78V 20mAmax.
VIO: 1.8Vtyp
150mAmax
VR4: 2.78V 50mAmax
Vcore: 1.0-1.8V
200mAmax
VR5: 2.78V 50mAmax
VR6: 2.78V 50mAmax
Note: Not used in NKC-1X
VR7: 2.78V 45mAmax
Summary of Contents for NKC-1X Series
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Page 34: ...NKC 1X System Module CCS Technical Documentation Page 34 Nokia Corporation Issue 1 02 03 ...
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