User Guide

Table Of Contents

RM-4/RM-5

Engine Module CCS Technical Documentation

ISSUE 1 02/2004 COMPANY CONFIDENTIAL 9

mable 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.

The 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. The DSP and MCU

contain phase locked loop (PLL) clock multipliers, which can multiply the system frequency.

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.

Communication between the UEM and the UPP is carried out via the bi-directional serial buses

CBUS and DBUS. The CBUS is controlled by the MCU and it operates at a speed of 1 MHz set

by SW. The DBUS is controlled by the DSP and it operates at a speed of 13 MHz. Both proc-

essors are located in the UPP.

The UEM ASIC mainly handles the interface between the baseband and the RF section. The

UEM 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 user interface. The UEM supplies the analog signals to RF section according to

the UPP DSP digital control.

The RF ASIC MJOELNER is controlled through the UPP RFBUS serial interface. There are

also separate signals for PDM coded audio. Digital speech processing is handled by the DSP

inside the UPP ASIC. The 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, VBAT

is directly used by some blocks also.

The baseband supports both internal and external microphone inputs and speaker outputs. In-

put and output signal source selection and gain control is carried out by the UEM according to

control messages from the UPP.

Nokia 2300 has two external serial control interfaces: FBUS and MBUS. These buses can be

accessed only through the production test pattern as described in section 4.

The transceiver module is implemented on 6 layer selective OSP/Gold coated PWB.

Modes of Operation

Nokia 2300 baseband engine has six different operating modes (in normal mode):

• No_Supply

• Power_off

• Acting_Dead

• Active

• Sleep

•Charging

Additionally, two modes exist for product verification: 'test mode' and 'local mode'.