Nokia 8260 Service Manual 02sysmod

PAMS Technical Documentation

NSW-4 Series Transceivers

System Module SE2L

Issue 1 08/00  Nokia Mobile Phones Ltd.

NSW-4
System Module SE2L

PAMS Technical Documentation

AMENDMENT RECORD SHEET

Amendment
Number

Date Inserted By Comments

08/00 OJuntune Issue1

Page 2

 Nokia Mobile Phones Ltd.

Issue 1 08/00

PAMS Technical Documentation

CONTENTS

Transceiver NSW-4 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

External Connectors and Main Interfaces 7. . . . . . . . . . . . . . . . . .

Contacts Description 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Connector 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging Connector 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Headset Connector 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Baseband Module, Functional Description 10. . . . . . . . . . . . . . . . . .

Modes of Operation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Control Channel mode (ACCH) 10. . . . . . . . . . . . . . . .

Analog Voice Channel Mode (AVCH) 10. . . . . . . . . . . . . . . . .

Digital Control Channel Mode (DCCH) 11. . . . . . . . . . . . . . . .

Digital Traffic Channel Mode (DTCH) 11. . . . . . . . . . . . . . . . .

Out of Range mode (OOR) 12. . . . . . . . . . . . . . . . . . . . . . . . . .

Locals Mode 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Summary 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Submodules 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Baseband Submodules 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CTRLU 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MCU main features 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DSP Main Features 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Logic main Features 16. . . . . . . . . . . . . . . . . . . . . . . . .

Memories 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AUDIO–RF 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COBBA Main Features 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PWRU 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CCONT Main Features 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHAPS Main Features 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NSW-4

System Module SE2L

Page No

Clocking 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Clock 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleep Clock 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Resets 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power–up reset 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Other reset 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Up 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power up with a charger 22. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Normal Battery voltage 22. . . . . . . . . . . . . . . . . . . . . . . . . . .

Empty Battery 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Up by IBI 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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NSW-4
System Module SE2L

Mixed Trigger to power up 24. . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Down 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Controlled Power Down 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Down pushing PWR key 24. . . . . . . . . . . . . . . . . . . .

Power Down when the battery voltage is too low 24. . . . .

Power Down with fault in transmitter 24. . . . . . . . . . . . . . . .

Uncontrolled Power Down 24. . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Down when Watchdog expires 24. . . . . . . . . . . . . .

Battery Disconnected 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Disconnected when charger is connected 25. . . .

Sleep Mode 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Entering the Sleep mode 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Waking up from the Sleep mode 25. . . . . . . . . . . . . . . . . . . . .

Charging Control 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Two–wire Charging 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Three–wire Charging 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Watchdog 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Overvoltage Protection 27. . . . . . . . . . . . . . . . . . . . . . .

Battery Identification 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Temperature 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply Voltage Regulators 29. . . . . . . . . . . . . . . . . . . . . . . . . .

Audio Control 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal Microphone and Earpiece 31. . . . . . . . . . . . . . . . . . . .

External Audio Connections 32. . . . . . . . . . . . . . . . . . . . . . . . .

Audio Accessory Detection 32. . . . . . . . . . . . . . . . . . . . . . . .

Internal Audio Connections (speech processing) 32. . . . . . .

4–wire PCM Serial Interface 33. . . . . . . . . . . . . . . . . . . . . . . . .

Speech Processing 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alert Signal Generation 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital Control 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAD 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Memories 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program Memory 16MBit Flash 36. . . . . . . . . . . . . . . . . . . .

SRAM Memory 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EEPROM Emulated in FLASH Memory 36. . . . . . . . . . . . .

Flash Programming 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PAMS Technical Documentation

RF Module 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Summary 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Frequency Plan 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Characteristics 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution Diagram 39. . . . . . . . . . . . . . . . . . . . . . . . . .

Regulators 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800 RX 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDMA 1900 RX 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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PAMS Technical Documentation

Frequency Synthesizers 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS 800 operation 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDMA 1900 operation 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800 TX 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TDMA1900 TX 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800/TDMA1900 operation 44. . . . . . . . . . . . . . . . . . . . . .

Supply voltages in different modes of operation 44. . . . . . . .

Software Compensations 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Levels (TXC) vs. Temperature 45. . . . . . . . . . . . . . . . .

Power Levels (TXC) vs. Channel 45. . . . . . . . . . . . . . . . . . . . .

Power levels vs. Battery Voltage 45. . . . . . . . . . . . . . . . . . . . .

TX Power Up/Down Ramps 45. . . . . . . . . . . . . . . . . . . . . . . . .

Digital Mode RSSI 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Block Specifications 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NSW-4

System Module SE2L

Receiver 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS 800MHz RX Front End 46. . . . . . . . . . . . . . . . . . . . . .

TDMA 1900MHz RX Front End 46. . . . . . . . . . . . . . . . . . . . . .

SAW Filter 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog IF parts 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital IF parts 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TX Power levels 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Synthesizers 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

UHF Synthesizers specification 50. . . . . . . . . . . . . . . . . . . .

VHF Synthesizers specification 50. . . . . . . . . . . . . . . . . . . .

Output levels 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF/BB interface signals 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Lists 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine Module SE2L (0201494) 56. . . . . . . . . . . . . . . . . . . . . . . .

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NSW-4
System Module SE2L

CONTENTS

Schematics/ Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A1 – A11

System block diagram A1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualband RX A2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualband TX A3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio A4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CTRLU A5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualband Synth A6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PWRU A7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

User Interface (UI) A8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dualband RF A9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component Layout – top A10. . . . . . . . . . . . . . . . . . . . . . . . . .

Component Layout – bottom A11. . . . . . . . . . . . . . . . . . . . . .

PAMS Technical Documentation

Page No

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PAMS Technical Documentation

Transceiver NSW-4

Introduction

The NSW–4 is a dual band triple mode radio transceiver designed for the

DAMPS and TDMA1900 networks.

The transceiver comprises of a System/RF module SE2L with integrated

user interface and assembly parts.

The transceiver features a full graphic display and a two soft–key based

user interface. The antenna is internal. External antenna connection is

not included. The transceiver also features a leakage tolerant earpiece

and a noise cancelling microphone.

NSW-4

System Module SE2L

External Connectors and Main Interfaces

Contacts Description

The transceiver electronics consist of the Radio Module ie. RF + System

blocks, the keyboard PCB, the display module and audio components.

The keypad and the display module are connected to the Radio Module

with connectors. System blocks and RF blocks are interconnected with

PCB wiring. The Transceiver is connected to accessories via charger con-

nector (includes jack and plates), and headset connector.

The System blocks provide the MCU, DSP and Logic control functions in

MAD ASIC, external memories, audio processing and RF control hard-

ware in COBBA ASIC. Power supply circuitry CCONT ASIC delivers oper-

ating voltages both for the System and the RF blocks.

The RF block is designed for a handportable phone which operates in the

TDMA system. The purpose of the RF block is to receive and demodulate

the radio frequency signal from the base station and to transmit a modu-

lated RF signal to the base station.

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NSW-4

5.0

Maximum voltage in call state with charger

System Module SE2L

PAMS Technical Documentation

Battery Connector

Battery contact signals

Pin Name Min Typ Max Unit Notes

4 BVOLT 3.0 3.6 4.5

5.3

3 BSI

2 BTEMP

0 2.85 V Battery size indication

181% kohm Battery indication resistor (Ni battery)

20 22 24 kohm Battery indication resistor (service battery)

33+/1 kohm Battery indication resistor (4.1V 600 mAh Lith-

47+/–

10%

0 1.4 V Battery temperature indication

2.1
1 10

1.9

90 100

3

20

2.85
200

V Battery voltage

Maximum voltage in idle state with charger

Phone has 100kohm pull up resistor.

SIM Card removal detection

(Threshold is 2.4V@VBB=2.8V)

ium battery)

kohm Battery indication resistor (Flash adapter)

Phone has a 100k (+–5%) pullup resistor,

Battery package has a NTC pulldown resistor:

47k+–5%@+25C , B=4050+–3%

V

ms

V

ms

Phone power up by battery (input)

Power up pulse width

Battery power up by phone (output)

Power up pulse width

1 BGND 0 0 V Battery ground

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PAMS Technical Documentation

Charging Connector

NSW-4

System Module SE2L

Contact Line

Sym-

Parameter Min. Typical /

Nominal

Max. Unit / Notes

bol

Jack &
surface
contact

VIN Charger input voltage

Charger input current

7.1

720

7.24

8.4

800

7.6

9.3

850

7.95

V/ Unloaded ACP–9
Charger

mA/ Supply current
V/ Unloaded ACP–7

Charger

320

5.7
500

370

6.0
620

420

6.3
750

mA/ Supply current
V/ Unloaded ACP–8

Charger
mA/ Supply current

Jack &
surface

L_
GND

Charger ground input 0 0 0 V/ Supply ground

contact
Jack &

surface
contact

CHRG
CTRL

Output high voltage
Output high voltage

PWM frequency

0

2.0
32/1

0.8

2.8

V/ Charger control
(PWM) high

Hz /PWM frequency for
charger

Supply Voltages and Power Consumption

Connector Line Symbol Minimum Typical /

Nominal

Charging VIN 7.1 8.4 9.3 V/ Travel charger,

Charging VIN 7.25 7.6 7.95 V/ Travel charger.

Charging I / VIN 720 800 850 mA/ Travel charger,

Charging I / VIN 320 370 420 mA/ Travel charger,

Maximum/

Peak

Unit / Notes

ACT–1

ACP–7, ACP–8

ACT–1

ACP–7

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NSW-4
System Module SE2L

Headset Connector

The contacts of the headset connector are listed below, with the help of
the diagram of the headset plug.

Contact Line Symbol

PAMS Technical Documentation

HEADSET

PLUG

1234/5

1. contact (plug ring 1) XMICN

2. contact (plug ring 2) XEARN

3. contact (plug ring 3) XMICP

4. and 5. contact (center pin) XEARP (4) / HEADSETINT (5)

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PAMS Technical Documentation

System Module SE2L

Baseband Module, Functional Description

Modes of Operation

The phone has the following main operating modes
– Analog mode, on 800 MHz band

– Analog Control Channel ACCH
– Analog Voice Channel AVCH

– Digital mode, on 800 MHz band

– Digital Control Channel DCCH
– Digital Traffic Channel DTCH

NSW-4

– Digital mode, on 1900 MHz band

– Digital Control Channel DCCH

– Digital Traffic Channel DTCH
– Out Of Range –mode OOR
– Locals mode

Analog Control Channel mode (ACCH

On analog control channel the phone receives continuous signalling
messages on Forward Control Channel (FOCC) from base station, being
most of the time in IDLE mode. Only the receiver part is on. Occasionally
the phone re–scans control channels in order to find the stronger or
otherwise preferred control channel.

Also registration (TX on) happens occasionally, whereby the phone sends
its information on Reverse Control Channel (RECC) to base station and
the phone’s location is updated in the switching office.

If a call is initiated, either by the user or base station, the phone moves to
analog voice channel or digital traffic channel mode depending on the
orders by the base station.

)

Analog Voice Channel Mode (AVCH)

The phone receives and transmits analog audio signal. All circuitry is
powered up except digital rx–parts. In this mode the DSP does all the au­dio processing and in the Hands Free (HF) mode it also performs echo–
cancellation and the HF algorithm. COBBA performs the AD–conversion
for the MIC signal, and the DA–conversion for the EAR signal.

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NSW-4
System Module SE2L

With audio signal also SAT (Supervisory Audio Tone) is being received
from the base station. The SAT signal can be 5970 Hz, 6000Hz or 6030
Hz, the frequency being defined by the base station. DSP’s DPLL phase
lock loops to SAT, detects if the SAT frequency is the expected one and
examines the signal quality. DSP reports SAT quality figures to MCU reg­ularly. The received SAT signal is transponded (transmitted back) to base
station.

The base station can send signalling messages on Forward Voice Chan­nel (FVC) to the phone, by replacing the audio with a burst of Wide Band
Data (WBD). Typically these are handoff or power level messages. Sys­tem Logic RX–modem is used for receiving the signalling message burst,
after which it gives interrupt to MCU for reading the data. During the burst
audio path must be muted; MCU gives message to DSP about this. MCU
can acknowledge the messages on Reverse Voice Channel (RVC), where
DSP sends the WBD to transmitter RF.

Also Signalling Tone (ST) can be transmitted to acknowledge messages
from base station. DSP sends ST after MCU’s command.

PAMS Technical Documentation

On Analog Voice Channel MCU uses sleep mode (HW DEEP SLEEP)
most of the time, but other circuits are fully operational.

Digital Control Channel Mode (DCCH)

On digital control channel (DCCH) DSP receives the paging information
from the Paging channels. DSP sends messages to MCU for processing
them.

Each Hyperframe (HFC) comprises two Superframes (SF), the first as
the Primary (p) and the second as the Secondary (s) paging frame. The
assigned Page Frame Class (PFC) defines the frames which must be re­ceived, and thus it also defines when the receiver must be on; i.e. the
basic power consumption is defined at the same time.

The phone employs sleep mode between received time slots. Then DSP
sets the sleep clock timer and MCU, DSP and RF including VCXO are
powered down. Only sleep clock and necessary timers are running.

From DCCH phone may be ordered to analog control channel or to ana­log or digital traffic channel.

Digital Traffic Channel Mode (DTCH)

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Digital Voice Channel

On digital voice channel DSP processes speech signal in 20 ms time
slots. DSP performs the speech and channel functions in time shared
fashion and sleeps whenever possible. Rx and tx are powered on and off
according to the slot timing. MCU is waken up mainly by DSP, when
there is signalling information for the Cellular Software.

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PAMS Technical Documentation

Digital Data Channel

Digital Data Channel is supported in the product.

Out of Range mode (OOR)

If the phone cannot find signal from the base station on any control chan­nel (analog or digital) it can go into OOR mode for power saving.

All RF circuits are powered off and baseband circuits are put into low
power mode, VCXO is stopped and only sleep clock is running in MAD
and CCONT. After the programmable timer in MAD has elapsed the
phone turns receiver on and tries to receive signalling data from base sta­tion. If it succeeds, the phone goes to standby mode on analog or digital
control channel. If the connection can not be established the phone will
return to out of range mode, until the timer elapses again.

Locals Mode

NSW-4

System Module SE2L

Locals mode is used by product development, production and after sales,
for testing purposes. MCU’s Cellular Software is stopped (no signalling to
base station), and the phone is controlled by MBUS messages from test
PC.

Technical Summary

List of Submodules

Submodule Function

CTRLU Control Unit for the phone, comprising MAD ASIC (MCU, DSP,

System Logic) and Memories
PWRU Power supply, comprising CCONT and CHAPS
AUDIO_RF_IF Audio coding and RF–BB interface, COBBA
UI User Interface components

These blocks are only functional blocks and therefore have no type nor
material codes. For block diagram, see baseband schematics.

The battery voltage range in DCT3 family is 3.0V to 4.5V depending on
the battery charge and used cell type (Li–Ion or NiMH). Because of the
battery voltage the baseband supply voltage is a nominal of 2.8V.

The baseband is running from a 2.8V power rail which is supplied by a
power controlling asic (CCONT). In the CCONT there are seven individu­ally controlled regulator outputs for the RF section, one 2.8V output for
the baseband plus a core voltage for MAD1. In addition there is one +5V
power supply output(V5V). A real time clock function is integrated into the
CCONT which utilizes the same 32KHz clock supply as the sleep clock.
A backup power supply is provided for the RTC which keeps the real time

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clock running when the main battery is removed. The backup power sup­ply is a rechargeable polyacene battery with a backup time of ten min­utes.

The interface between the baseband and the RF section is handled by a
specific asic. The COBBA_D asic 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 UI parts. Data transmission between the COBBA_D and the
MAD is implemented using serial connections. Digital speech processing
is handled by the MAD asic. The COBBA_D asic is a dual supply voltage
circuit, the digital parts are running from the baseband supply VBB and
the analog parts are running from the analog supply VCOBBA (VR6).

Block diagram for the phone is below.

PAMS Technical Documentation

LCD

vibra
motor

BASEBAND

TX/RX SIGNALS

COBBA SUPPLY

COBBA_P

AUDIOLINES

MAD1
+

MEMORIES

CHARGER conn

RF SUPPLIES

CCONT

BB SUPPLY

core voltage

CHAPS

PA SUPPL Y

32kHz
CLK

SLEEP CLOCK

VBAT

19.44M
CLK

SYSTEM CLOCK

BATTERY
NiMH LiIon

Baseband Submodules

CTRLU

CTRLU comprises MAD ASIC (MCU, DSP, System Logic) and Memories.
The environment consists of two memory circuits; (FLASH, SRAM),

22–bit address bus, and 16–bit data bus. Also there are ROM1SELX,
ROM2SELX, and RAMSELX signals for chip selection.

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MCU main features

System control

Cellular Software (CS)

Cellular Software communicates with the switching office, and
performs call build–up, maintenance and termination.

Communication control

M2BUS is used to communicate to external devices. This in­terface is also used for factory testing, service and mainten­ance purposes.

User Interface (UI)

PWR–key, keyboard, LCD, backlight, mic, ear and alert (buz­zer, vibra, led) control. Serial interface from MAD to LCD
(same as for CCONT).

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Authentication

Authentication is used to prevent fraud usage of cellular
phones.

RF monitoring

RF temperature monitoring by VCXOTEMP, ADC in CCONT.
Received signal strength monitoring by RSSI, ADC in CCONT.
False transmission detection by TXF signal, digital IO–pin.

Power up/down and Watchdog control

When power key is pressed, initial reset (PURX) has happened
and default regulators have powered up in CCONT, MCU and
DSP take care of the rest of power up procedures (LCD, COB­BA, RF). The MCU must regularly reset the Watchdog counter
in CCONT, otherwise the power will be switched off.

Accessory monitoring

Accessory detection by EAD (HEADSETINT), AD–converter in
CCONT.

Battery and charging monitoring

MCU reads the battery type (BTYPE), temperature (BTEMP)
and voltage (VBAT) values by AD–converter in CCONT, and
phone’s operation is allowed only if the values are reasonable.
Charging current is controlled by writing suitable values to
PWM control in CCONT.

Production/after sales tests and tuning

Control of CCONT via serial bus

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MCU reads also charger voltage (VCHAR) and charging cur­rent values (ICHAR).

Flash loading, baseband tests, RF tuning

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MCU writes controls (regulators on/off, Watchdog reset,
charge PWM control) and reads AD–conversion values. For
AD–conversions MCU gives the clock for CCONT (bus clock),
because the only clock in CCONT is sleep clock, which has a
too low frequency.

DSP Main Features

DSP (Digital Signal Processor) is in charge of the channel and speech
coding according to the IS–136 specification. The block consists of a DSP
and internal ROM and RAM memory. The input clock is 9.72 MHz, and
DSP has its own internal PLL–multiplier. Main interfaces are to MCU, and
via System Logic to COBBA and RF.

System Logic main Features

– MCU related clocking, timing and interrupts (CTIM)
– DSP related clocking, timing and interrupts (CTID)
– DSP general IO–port
–reset and interrupts to MCU and DSP
– interface between MCU and DSP (API)

PAMS Technical Documentation

– MCU interface to System Logic (MCUif)
– MCU controlled PWMs, general IO–port and USART for MBUS (PUP)
– Receive Modem (Rxmodem)
– Interface to Keyboard, CCONT and LCD Drivers (UIF)
– Interface to MCU memories, address lines and chip select decoding
(BUSC)

– DSP interface to System Logic (DSPif)
– serial accessory interface (AccIf, DSP–UART)
– Modulation, transmit filter and serial interface to COBBA (MFI)
– Serial interface for RF synthesizer control (SCU)

Memories

The speed of FLASH and SRAM is 120 ns.
FLASH
– size 1024k * 16 bit, contains the main program code for the MCU, and

is able to emulate EEPROM.
SRAM
– size 128k * 16 bit

AUDIO–RF

Audio interface and baseband–RF interface converters are integrated into
COBBA circuit.

COBBA Main Features

The codec includes microphone and earpiece amplifier and all the neces­sary switches for routing. There are two different possibilities for routing;

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internal and external devices. There are also all the AD– and DA– con­verters for the RF interface.

DEMO block is used for FM–demodulation in analog mode.
A slow speed DA–converter provides automatic frequency control (AFC).

In addition, there is a DA–converters for transmitter power control (TXC).
COBBA also passes the RFC (19.44 MHz) to MAD as COBBACLK (9.72

MHz).
COBBA is connected to MAD via two serial buses:
– RXTXSIO, for interfacing the RF–DACs and DEMO; and also for audio

codec and general control. Signals used: COBBACLK (9.72 MHz, from
COBBA), COBBACSX, COBBASD (bi–directional data) and COBBA­DAX (data ready flag for rx–samples).

– Codec SIO, for interfacing the audio ADCs / DACs (PCM–samples).

Signals: PCMDCLK (data clock 1.08 MHz / 1.215 MHz), PCMSCLK
(frame sync 8.0 kHz / 8.1 kHz), PCMTxdata and PCMRxdata.

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PWRU

PWRU comprises CCONT circuit and CHAPS circuit.

CCONT Main Features

CCONT generates regulated supply voltages for baseband and RF.
There are seven 2.8 V linear regulators for RF, one 2.8 V regulator for
baseband, one special switched output (VR1_SW), one programmable 2
V output (V2V), one 3/5 V output, one 5 V output, and one 1.5 V +/– 1.5
% reference voltage for RF and COBBA.

Other functions include:
– power up/down procedures and reset logic

– charging control (PWM), charger detection
– watchdog
– sleep clock (32.768 kHz) and control
– 8–channel AD–converter.

CHAPS Main Features

CHAPS comprises the hardware for charging the battery and protecting
the phone from over–voltage in charger connector.

The main functions include
– transient, over–voltage and reverse charger voltage protection

– limited start–up charge current for a totally empty battery
– voltage limit when battery removed
– with SW protection against too high charging current

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Clocking

System Clock

CHAPS

BATTERY

VR1

PAMS Technical Documentation

19.44MHz

VCXO

200mVpp–1Vpp
sine wave

MAD COBBA

LCD–DRVR

LCDRESXRFC

PWRONX

32 kHz

. Clocking and resets

VCXO on RF provides the system clock for baseband (RFC). COBBA
squares the clock and divides it by two for MAD (COBBACLK).

This clock can be stopped by cutting supply voltage from VCXO (CCONT
regulator VR1) and started again by powering on the same regulator.
MAD controls it through RFCEN. It can be stopped only when both MCU
and DSP request that. It is always stopped in SLEEP–mode on control
channels. When the VCXO is stopped time is measures in MAD by using
the sleep clock SLCLK; when the programmable timer expires it gives in­terrupt to DSP/MCU and MAD also starts the VCXO power supply by
RFCEN signal.

CCONT

SLCLK

PURX

RFCEN
RFCSETTLED

COBBARESX

COBBACLK

9.72MHz
Square wave

2.8Vpp

The same sleep clock is also used in the MBUS interface, to detect if
there is communication on the bus during sleep periods.

Inside MAD System Logic parts provide clock signal to both DSP and
MCU, and both internal clocks can be stopped individually for power sav­ing. MCU can use either CLOCK STOP or HW STANDBY sleep mode.

Sleep Clock

CCONT makes 32.768 kHz sleep clock for MAD. This crystal oscillator in
CCONT_2’ starts to run only after the battery is connected and the phone

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has been started once. The SLCLK output is enabled only when the
baseband parts are powered up.

After the sleep periods, when the VCXO is restarted (by RFCEN), MAD
takes care that the clock is not used before it is properly settled. MAD out­put RFCSETTLED prevents COBBA from using the clock during the set­tling time (RFCSETTLED rises later than RFCEN), as well MAD internally
inhibits DSP and MCU during the same time. This settling time can be
programmed before going to sleep mode, and the sleep clock is used for
measuring the time.

Resets

Power–up reset

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CCONT gives the power–up reset (PURX) to MAD and COBBA. Also dis­play is reset via MAD output pin. During this reset the VCXO clock has
enough time to settle so that it can be used as the system clock after
reset.

Other reset

COBBA can be also internally reset; there are two internal reset bits in
COBBA registers which can be written by MAD.

LCD reset is possible also by by MCU SW, because the control pin pin is
controlled by MCU.

There are also MAD internal reset possibilities
– MCU can reset system logic parts
– MCU can reset DSP
– SW–watchdog can reset the whole MAD

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Power Distribution

In normal operation the baseband is powered from the phone‘s battery.
The battery consists of one Lithium–Ion cell. There is also a possibility to
use batteries consisting of three Nickel Metal Hydride cells or one Solid
state cell. An external charger can be used for recharging the battery and
supplying power to the phone. The charger can be either performance
charger, which can deliver supply current up to 850 mA or a standard
charger that can deliver approx. 300 mA.

The figure below is a simplified block diagram of the power distribution.
The power management circuitry provides protection against overvol-

tages, charger failures and pirate chargers etc. that could cause damage
to the phone.

PAMS Technical Documentation

VCHAR

CHAPS

VBAT

PWM

BATTERY

CCONT

VR1

VR6
VBB

VCXO

MAD

VBB
V5V
Vref

SIO

COBBA LCD–DRVR

FLASH

RF

VR1–VR7

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Battery voltage VBAT is connected to CCONT which regulates all the sup­ply voltages VBB, VR1–VR7, VSIM and V5V. CCONT enables automati­cally VR1, VBB, VR6 and Vref in power–up.

VBB is used as baseband power supply for all digital parts. It is constantly
on when the phone is powered up.

VSIM is used as programming voltage for the Flash memory whenever a
partial re–flashing is needed, e.g. when the Flash emulates EEPROM.

V5V is used for RF parts only. In CCONT_2’ it also can be switched off by
using RFCEN signal.

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