User Guide

CCS Technical Documentation System Module
RH-25
Issue 1 10/2003 ©Nokia Corporation Confidential Page 7
• Battery
• LED Driver
• LCD Display
• RF (TACO) IF Block
• Memory Module
• Keyboard (UI module)
• External Audio Connector
• IrDa Interface
• Vibra
• FM Radio
• System Connector (Tomahawk)
• PWB Strategy
• EMC Strategy
• Test Interface
UEM and UPP
The UEM contains a series of voltage regulators to supply both the baseband module and
the RF module. Both the RF and Baseband modules are supplied with regulated voltages
of 2.78 V and 1.8 V. The UEM contains six linear LDO (low drop-out) regulators for Base-
band and seven regulators for RF circuitry. RF regulator VR1 uses two LDOs and a charge
pump. VR1 regulator is used by TACO RF module. 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. It should be noted that with UEMK,
VCORE supply voltage is set to 1.5 V. UEMC will support VCORE voltage below 1.5V.
The UPP operates from a 19.44MHz clock generated in the RF ASIC TACO. The DSP and
MCU both contain phase locked loop (PLL) clock multipliers, which can multiply the sys-
tem frequency by factors from 0.25 to 31. The actual execution speed is limited by the
memory configuration and process size (Max. DSP speed for C035 is ~ 200MHz).
The UEM contains a real-time clock, sliced down from the 32768 Hz crystal oscillator.
The 32768 Hz clock is used by UPP as the 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
1.08 MHz. The DBus is controlled by the DSP and operates at a speed of 13 MHz. Both