Nokia 3105 서비스 매뉴얼

CCS Technical Documentation

System Module

RH-48

Issue 1 11/2003      Confidential         ©

2003 Nokia Corporation

Page 5

VANA regulator supplies internal and external analog circuitry of BB. It is disabled in 
sleep mode. 

Vflash1 regulator supplies LCD and digital parts of UEM ASIC. It is enabled during startup 
and goes to low Iq-mode in sleep mode. 

VIO regulator supplies both external and internal logic circuitries. It is used by LCD, flash, 
Jedi, Yoda, and UPP. Regulator goes in to low Iq-mode in sleep mode.

VCORE supplies DSP, Core part of UPP. Voltage is programmable and the startup default 
is 1.5V. Regulator goes to low Iq-mode in sleep mode. VCORE is supplied by DC/DC (the 
internal regulator is not used).

VR1 regulator (VR1a) uses two LDOs and a charge pump. VR1a is used to bias cellular PA. 

VR2 is a linear regulator used to supply Jedi RF ASIC. 

VR3 is a linear regulator used by Yoda RF ASIC and VCTCXO circuitry. 

VR4 is a linear regulator used by Alfred’s LNA RF front end ASIC circuitry. 

VR5 is a linear regulator used by Jedi RFIC. 

VR6 is a linear regulator used by Yoda RFIC

VR7 is a linear regulator used by synthesizer and VCO circuits on both Jedi and Yoda RFIC

RF Interface

In addition to the RF regulators mentioned, UEM handles the interface between the 
baseband and the RF section. It provides A/D and D/A conversion of the in-phase and 
quadrature receive and transmit signal paths, and also A/D and D/A conversions of 
received and transmitted audio signals to and from the UI section. The UEM supplies the 

VANA: 2.78V typ 80mA max

VR 1a: 4.75V 12mA max

Vflash1: 2.78V typ 70mA max

Vflash2: 2.78V typ 40mA max

VR2: 2.78V 100mA max

VSim: 1.8/3.0V 25mA max

VR3: 2.78V 20mA max

VIO: 1.8V typ 150mA max

VR4: 2.78V 50mA max

Vcore: 1.0-1.8V 100mA max

VR5: 2.78V 50mA max

VR6: 2.78V 50mA max

VR7: 2.78V 45mA max