Manualshelf

User Guide

ManualsBrandsNokia ManualsCell Phone1101
12345678910
RH-18/36/38 Company confidential
Engine module CCS Technical Documentation
Page 10 Nokia Corporation. Issue 1 10/03
The UEM ASIC mainly handles the interface between the baseband and the RF section.
UEM provides A/D and D/A conversion of the in-phase and quadrature receive and trans-
mit signal paths and also A/D and D/A conversions of received and transmitted audio sig-
nals to and from the user interface. The UEM supplies the analog signals to RF section
according to the UPP DSP digital control.
RF ASIC MJOELNER is controlled through UPP RFBUS serial interface. There are also sep-
arate signals for PDM coded audio. Digital speech processing is handled by the DSP
inside UPP ASIC. UEM is a dual voltage circuit, the digital parts are running from the
baseband supply 1.8V and the analog parts are running from the analog supply 2.78V,
also VBAT is directly used by some blocks.
The baseband supports both internal and external microphone inputs and speaker out-
puts. Input and output signal source selection and gain control is done by the UEM
according to control messages from the UPP.
The transceiver module is implemented on 6 layer selective OSP/Gold coated PWB.
Modes of Operation
baseband has six different operating modes (in normal mode):
• No_Supply
• Power_off
• Acting_Dead
• Active
• Sleep
• Charging
Additionally two modes exist for product verification: 'testmode' and 'local mode'.
No supply
In No_Supply mode, the phone has no supply voltage. This mode is due to disconnection
of main battery or low battery voltage level.
Phone is exiting from No_Supply mode when sufficient battery voltage level is detected.
Battery voltage can rise either by connecting a new battery with VBAT > V
mstr+
or by
connecting charger and charging the battery above V
mstr+
.
Power_off
In this state the phone is powered off, but supplied. VRTC regulator is active (enabled)
having supply voltage from main battery. Note, the RTC status in PWR_OFF mode
depends on whether RTC was enabled or not when entering PWR_OFF. From Power_off