CCS Technical Documentation Engine module
Company confidential RH-18/36/38
Issue 1 10/03 Nokia Corporation. Page 9
engine program.
Figure 1: Baseband block diagram
The UEM supplies both the baseband module as well as the RF module with a series of
voltage regulators. Both the RF and Baseband modules are supplied with regulated volt-
ages of 2.78 V and 1.8V. UEM includes 6 linear LDO (low drop-out) regulators for base-
band and 7 regulators for RF. The UEM is furthermore supplying the baseband SIM
interface with a programmable voltage of either 1.8 V or 3.0 V. The core of the UPP is
supplied with a programmable voltage of 1.0 V, 1.3 V, 1.5 V or 1.8 V.
UPP operates from a 26MHz clock, coming from the RF ASIC MJOELNER, the 26 MHz
clock is internally divided by two, to the nominal system clock of 13MHz. DSP and MCU
contain phase locked loop (PLL) clock multipliers, which can multiply the system.
The UEM contains a real-time clock, sliced down from the 32768 Hz crystal oscillator.
The 32768 Hz clock is fed to the UPP as a sleep clock.
The communication between the UEM and the UPP is done via the bi-directional serial
busses CBUS and DBUS. The CBUS is controlled by the MCU and operates at a speed of 1
MHz set by SW. The DBUS is controlled by the DSP and operates at a speed of 13 MHz.
Both processors are located in the UPP.
RFBUS
UEM
UPP
FLASH
Battery
CBUS/
DBUS
BB
Supplies
RF Supplies
UI
DCT4 Janette connector
RF RX/TX
PA Supply
MBus/FBus
External Audio
Charger connection
Mjoelner
26MHz
SLEEPCLK
32kHz
Baseband
MEMADDA
M
VIBRA
EAR
MIC
DLIGHT
speaker
Buzzer
SIM
Flashlight
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