Nokia RH-18 Manual page 9

CCS Technical Documentation
engine program.
PA Supply
RF Supplies
RF RX/TX
SIM
Flashlight
EAR
MIC
speaker
Buzzer
M
VIBRA
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.
Issue 1 10/03
Company confidential
Battery
Baseband
UEM
External Audio
Charger connection
DCT4 Janette connector
Figure 1: Baseband block diagram
Nokia Corporation.
UI
26MHz
DLIGHT
SLEEPCLK
32kHz
CBUS/
DBUS
BB
Supplies
MBus/FBus
RH-18/36/38
Engine module
RFBUS
Mjoelner
UPP
MEMADDA
FLASH
Page 9