Customer Care Solutions
Technical Documentation
Engine module
ISSUE 1 02/2004 COMPANY CONFIDENTIAL 1
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Table of Contents
Page No
Abbreviations ................................................................................................................ 5
Baseband HW Introduction ...........................................................................................8
Technical Summary ....................................................................................................8
Modes of Operation .................................................................................................... 9
No supply ................................................................................................................ 10
Power_off ............................................................................................................... 10
Acting Dead ............................................................................................................ 10
Active ......................................................................................................................10
Sleep mode ............................................................................................................. 11
Charging ................................................................................................................. 11
DC Characteristics ....................................................................................................12
Supply Voltage Ranges .......................................................................................... 12
Regulators Voltage Ranges .................................................................................... 13
Interconnection Diagram ........................................................................................... 14
External Signals and Connections ............................................................................. 14
System connector (X102) ....................................................................................... 14
Battery connector .................................................................................................... 16
Baseband – RF interface ......................................................................................... 16
Internal Signals and Connections ..............................................................................16
Audio ...................................................................................................................... 16
Speaker (IHF & ringer) ........................................................................................... 17
Baseband board clocks ......................................................................................... 17
Environmental Specifications ......................................................................................19
Operating conditions .................................................................................................19
Temperature Conditions ......................................................................................... 19
Humidity ................................................................................................................... 19
Functional Description ................................................................................................ 20
Audio External ..........................................................................................................20
Audio Internal ........................................................................................................... 20
Earpiece .................................................................................................................. 20
Microphone .............................................................................................................21
Power amplifier (boomer) ......................................................................................... 22
Batteries .................................................................................................................... 23
FM radio .................................................................................................................... 25
Keyboard ...................................................................................................................27
Display & Keyboard Backlight .................................................................................28
LCD Backlight ........................................................................................................28
Keyboard light ........................................................................................................ 28
LED driver circuit ................................................................................................... 28
Display ...................................................................................................................... 29
Memory Module ....................................................................................................... 29
SIM Interface ............................................................................................................29
Vibra ..........................................................................................................................30
Test Interfaces ............................................................................................................. 31
Connections to Baseband .......................................................................................... 31
ISSUE 1 02/2004 COMPANY CONFIDENTIAL 3
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FLASH Interface .......................................................................................................31
FBUS Interface ......................................................................................................... 31
MBUS Interface ........................................................................................................32
General description of the RF circuits ......................................................................... 33
Receiver signal path ..................................................................................................33
Transmitter signal path .............................................................................................. 33
PLL ............................................................................................................................34
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Abbreviations
Abbr. Description
ACI Accessory Control Interface
ADC Analog Digital Connector
ARM Advanced RISC Machines
ASIC Application Specific Integrated Circuit
ATR Answer To Reset
BB Baseband
BL-5C Battery type.
BSI Battery Size Indicator
Cbus Control bus (internal phone interface between UPP-UEM)
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CTI Cover Type Indicator
CTSI Clock Timing Sleep and Interrupt
Dbus DSP controlled bus (Internal phone interface between UPP-UEM)
DC Direct Current
DCT4.0 Digital Core Technology, generation 4.0
DSP Digital Signal Processor
DUT Device under test
EAD External Accessory Detection
EMC Electro Magnetic Compatibility
ESD Electro Static Discharge
Fbus Fast Bus, asynchronous message bus connected to DSP (commu-
nications bus)
FCI Functional cover interface
FPC Flexible printed circuit
FR Full Rate
GENIO General Purpose Input/Output
GSM G lobal System Mobile
ISSUE 1 02/2004 COMPANY CONFIDENTIAL 5
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HW Hardware
IF Interface
IHF Integrated Hands Free
IMEI International Mobile Equipment Identity
LCD Liquid Crystal Display
LDO Low Drop Out
LED Light Emitting Diode
Li-Ion Lithium Ion battery
LPRF Low Power Radio Frequency
Lynx Battery type
MALT Medium And Loud Transducer
Mbus Asynchronous message bus connected to MCU (phone control
interface). Slow message bus for control data.
MCU Micro Controller Unit
NO_SUPPLY UEM state where UEM has no supply what so ever
NRT Nokia Ringing Tones
NTC Negative temperature Coefficient, temperature sensitive resistor
used as a temperature sensor.
PA Power Amplifier (RF)
PDM Pulse Density Modulation
PDRAM Program/Data RAM
Phoenix SW tool of DCT4.x
PLL Phase locked loop
PnPHF Plug and Play Handsfree
PUP General Purpose IO ( PIO), USARTS and Pulse Width Modulators
PWB Printed Wired Board
PWR_OFF UEM state where phone is off
PWRONX Signal from power on key.
R&D Research and development
RESET UEM state where regulators are enabled
RTC UEM internal Real Time Clock
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SARAM Single Access RAM
SIM Subscriber Identification Module
SLEEP UEM power saving state controlled by UPP
SPR Standard Product Requirements
SRAM Static RAM
STI Serial Trace Interface
SW Software
TBSF Through the Board Side Firing
TI Texas Instruments, American company
UEM Universal Energy Management
UI User Interface
UPP Universal Phone Processor
VBAT Main battery voltage
VCHAR Charger input voltage
VCHARDET Charger detection threshold level
VMSTR+,
Master Reset threshold level
VMSTR
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Baseband HW Introduction
This document specifies the baseband module for the Nokia 2300 phone. The baseband module includes the baseband engine chipset, the UI components and the acoustical parts for the
transceiver.
Nokia 2300 is a hand-portable dual band 900/1800MHz phone, featuring DCT4 generation
baseband (UEM/UPP) and RF (MJOELNER) circuitry. Nokia 2300 is closely related to Nokia
3510 and 3510i
Technical Summary
The baseband module contains 2 main ASICs named UEM and UPP. The baseband module
furthermore contains a Flash IC of 16Mbit. The baseband is based on the DCT4 engine program.
Figure 1: Nokia 2300 baseband block diagram
PA Supply
RF Supplies
RF RX/TX
SIM
EAR
MIC
LM4890
IHF
Battery
Baseband
UEM
DLIGHT
SLEEPCLK
Supplies
UI
32kHz
CBUS/
DBUS
BB
Mjoelner
26MHz
UPP
RFBUS
MEMADDA
M
VIBRA
External Audio
Charger connection
DCT4 Janette connector
MBus/FBus
AM/FM
Radio
FLASH
The UEM supplies both the baseband module as we ll as the RF module with a series of voltage
regulators. Both, the RF and baseband modules are supplied with regulated voltages of 2.78V
and 1.8V. The UEM includes 6 linear LDO (low drop-out) regulators for baseband and 7 regulators for RF. The UEM is furthermore supplying the baseband SIM interface with a program-
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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 processors 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. Input 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'.
ISSUE 1 02/2004 COMPANY CONFIDENTIAL 9
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No supply
In No_Supply mode, the phone has no supply voltage. This mode is due to disconnection of
the main battery or low battery voltage level.
The 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
ing charger and charging the battery above V
mstr+
.
or by connect-
mstr+
Power_off
In this state the phone is powered off, but supplied. The VRTC regulator is active (enabled)
having supply voltage from the main battery. Note that the RTC status in the PWR_OFF mode
depends on whether RTC was enabled or not when entering PWR_OFF. From the Power_off
mode the UEM enters the RESET mode (after 20ms delay), if any of the following statements
is true (logical OR –function):
• Power_on button detected (PWROFFX)
• charger connection detected (VCHARDET)
• RTC_ALARM detected
The phone enters the POWER_OFF mode from all the other modes except NO_SUPPLY if the
internal watchdog elapses.
Acting Dead
If the phone is off when the charger is connected, the phone is powered on but enters a state
called ”Acting Dead”. In this mode no RF parts are powered. To the user, the phone acts as if
it was switched off. A battery-charging alert is given and/or a battery charging indication on the
display is shown to acknowledge the user that the battery is being charged.
Active
In the active mode the phone is in normal operation, scanning for channels, listening to a base
station, transmitting and processing information. There are several sub-states in the active
mode depending on if the phone is in burst reception, burst transmission, if DSP is working etc.
In active mode SW controls the RF regulators.
Table 1: Regulator controls
Regulator NOTE
VFLASH1 Enabled; Low Iq mode during sleep
VFLASH2 Enabled; Disabled in sleep mode; Used for FM radio
VANA Enabled; Disabled in sleep mode
VIO Enabled; Low Iq mode during sleep
VCORE Enabled; Low Iq mode during sleep
VSIM Controlled by register writing.
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Table 1: Regulator controls
VR1A Enabled; Disabled in sleep mode
VR1B Not used in Nokia 2300, disabled
VR2 Controlled by register writing; Enabled in sleep mode
VR3 Enabled; Disabled in sleep mode
VR4 Not used in Nokia 2300, disabled
VR5 Enabled; Disabled in sleep mode
VR6 Enabled; Disabled in sleep mode
VR7 Enabled; Disabled in sleep mode
IPA1-2 Not used in Nokia 2300, disabled
Sleep mode
The sleep mode is entered when both MCU and DSP are in stand-by mode. Sleep is controlled
by both processors. When SLEEPX low signal is detected, the UEM enters SLEEP mode.
VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All RF regulators, except VR2, are disabled in SLEEP. When SLEEPX=1 is detected UEM enters ACTIVE
mode and all functions are activated.
The sleep mode is exited either by the expiration of a sleep clock counter in the UEM or by
some external interrupt, generated by a charger connection, key press, headset connection
etc.
In the sleep mode, the main oscillator (26MHz) is shut down and the 32kHz sleep clock oscillator is used as a reference clock for the baseband.
Charging
Charging can be performed in parallel with any other operating mode. A BSI resistor inside the
battery pack indicates the battery type/size. The resistor value corresponds to a spe cific battery
capacity and technology.
The battery voltage, temperature, size and current are measured by the UEM controlled by the
charging software running in the UPP.
The charging control circuitry (CHACON) inside the UEM controls the charging current delivered from the charger to the battery. Charging current is monitored by measuring the voltage
drop across a 220 mOhm resistor.
ISSUE 1 02/2004 COMPANY CONFIDENTIAL 11
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